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  • 1.
    Ahmad, Ashfaq
    et al.
    Univ Engn & Technol, ACTSENA Res Grp, Taxila 47050, Pakistan..
    Arshad, Farzana
    Univ Engn & Technol, ACTSENA Res Grp, Taxila 47050, Pakistan..
    Naqvi, Syeda I.
    Univ Engn & Technol, ACTSENA Res Grp, Taxila 47050, Pakistan..
    Amin, Yasar
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Centra, VinnExcellence Center for Intelligence in Paper and Packaging, iPACK. Univ Engn & Technol, ACTSENA Res Grp, Taxila 47050, Pakistan.
    Tenhunen, Hannu
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Centra, VinnExcellence Center for Intelligence in Paper and Packaging, iPACK. Univ Turku, Dept Informat Technol, TUCS, FIN-20520 Turku, Finland..
    Design, Fabrication, and Measurements of Extended L-Shaped Multiband Antenna for Wireless Applications2018Ingår i: Applied Computational Electromagnetics Society Journal, ISSN 1054-4887, Vol. 33, nr 4, s. 388-393Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    This article expounds a multi-band compact shaped antenna, which is based on CPW ground plane. FR-4 with a thickness of 1.6 mm is used as a substrate for the proposed antenna. The proposed antenna is capable of operating at 1.56 GHz for (Global Positioning System), 2.45 GHz (Wireless Local Area Network) and 4.49 GHz (Aeronautical Mobile Telemetry (AMT) fixed services). The efficiency at 1.56, 2.45, and 4.49 GHz is 79.7, 76.9 and 76.7%, respectively. The VSWR of the presented antenna is less than 1.5 at all the desired resonance modes, which confirms its good impedance matching. The performance of the proposed antenna is evaluated in terms of VSWR, return loss, radiation pattern and efficiency. CST (R) MWS (R) software is used for simulations. In order to validate the simulation results, a prototype of the designed antenna is fabricated and a good agreement is found between the simulated and measured results.

  • 2.
    Ahmad, Ashfaq
    et al.
    Univ Engn & Technol, ACTSENA Res Grp, Taxila 47050, Pakistan..
    Arshad, Farzana
    Univ Engn & Technol, ACTSENA Res Grp, Taxila 47050, Pakistan..
    Naqvi, Syeda Iffat
    Univ Engn & Technol, ACTSENA Res Grp, Taxila 47050, Pakistan..
    Amin, Yasar
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Centra, VinnExcellence Center for Intelligence in Paper and Packaging, iPACK.
    Tenhunen, Hannu
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Centra, VinnExcellence Center for Intelligence in Paper and Packaging, iPACK. TUCS, University of Turku, Turku, 20520, Finland.
    Loo, Jonathan
    Middlesex Univ, Sch Engn & Informat Sci, Dept Comp Sci, London, England..
    Flexible and Compact Spiral-Shaped Frequency Reconfigurable Antenna for Wireless Applications2020Ingår i: Journal of the Institution of Electronics and Telecommunication Engineers, ISSN 0377-2063, E-ISSN 0974-780X, Vol. 66, nr 1, s. 22-29Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    A flexible, spiral-shaped frequency reconfigurable antenna with a compact size (20 x 24 mm(2)) is presented. The proposed antenna has a low-profile planar structure and is able to operate at five different frequency bands, i.e., 4.19-4.48, 5.98-6.4, 3.42-4.0, 5.4-5.68, and 6.8-7.0 GHz. The multiband operation enables the antenna to cover aeronautical radio navigation, fixed satellite communication, WLAN, and WiMAX standards. A radiating element is backed by Rogers (R) 5880 substrate with a thickness of 0.508 mm and dielectric constant of 2.2. The spiral shape is achieved by introducing different strips. Frequency reconfiguration is achieved by the incorporation of a lumped element in a strip, so that the antenna can switch between different resonances. To validate the performance of the antenna, the prototype of the design was fabricated and tested. Good acquiescent is seen between simulated and measured results. The proposed antenna operates efficiently with appreciable return loss, directivity, bandwidth, and peak gain.

  • 3. Ali, Amjad
    et al.
    Jafri, Syeda I.
    Habib, Ayesha
    Amin, Yasar
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Centra, VinnExcellence Center for Intelligence in Paper and Packaging, iPACK. University of Engineering and Technology (UET), Pakistan.
    Tenhunen, Hannu
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Elektronik, Integrerade komponenter och kretsar. KTH, Skolan för informations- och kommunikationsteknik (ICT), Centra, VinnExcellence Center for Intelligence in Paper and Packaging, iPACK.
    RFID Humidity Sensor Tag for Low-cost Applications2017Ingår i: APPLIED COMPUTATIONAL ELECTROMAGNETICS SOCIETY JOURNAL, ISSN 1054-4887, Vol. 32, nr 12, s. 1083-1088Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    This article presents a low-cost, flexible, chipless Radio Frequency Identification (RFID) tag for humidity monitoring applications. The tag exhibits moisture sensing feature within a compact geometrical dimension of 20mm x 17.6mm. The design is loaded with 12 resonators, where each resonator represents 1 bit in the frequency domain. For the designed 12-bit tag, 11 inverted C-shaped resonators are dedicated for encoding 11-bit information in their spectral signature. An integrated meandered-shaped resonator, covered with moisture sensitive Kapton (R) HN film, functions as a 1-bit moisture sensor. It is deployed for monitoring relative humidity (RH) levels, simultaneously. The passive RFID tag is realized on Taconic TLX-0 and has an operational bandwidth of 2.62 GHz. Furthermore, the design is modeled and analyzed for multiple substrates. The performance of the sensor tag for various humidity levels indicates that it is a potential solution for inexpensive sensing applications.

  • 4. Anam, Hafsa
    et al.
    Habib, Ayesha
    Jafri, Syeda Irum
    Amin, Yasar
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Centra, VinnExcellence Center for Intelligence in Paper and Packaging, iPACK.
    Tenhunen, Hannu
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Centra, VinnExcellence Center for Intelligence in Paper and Packaging, iPACK.
    Directly Printable Frequency Signatured Chipless RFID Tag for IoT Applications2017Ingår i: Radioengineering, ISSN 1210-2512, E-ISSN 1805-9600, Vol. 26, nr 1, s. 139-146Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    This paper proposes a low-cost, compact, flexible passive chipless RFID tag that has been designed and analyzed. The tag is a bowtie-shaped resonator based structure with 36 slots; where each patch is loaded with 18 slots. The tag is set in a way that each slot in a patch corresponds to a metal gap in the other patch. Hence there is no mutual interference, and high data capacity of 36 bits is achieved in such compact size. Each slot corresponds to a resonance frequency in the RCS curve, and each resonance corresponds to a bit. The tag has been realized for Taconic TLX-0, PET, and Kapton (R) HN (DuPont (TM)) substrates with copper, aluminum, and silver nanoparticlebased ink (Cabot CCI-300) as conducting materials. The tag exhibits flexibility and well optimized while remaining in a compact size. The proposed tag yields 36 bits in a tag dimension of 24.5. 25.5 mm(2). These 36 bits can tag 2(36) number of objects/items. The ultimate high capacity, compact size, flexible passive chipless RFID tag can be arrayed in various industrial and IoT-based applications.

  • 5.
    Aslam, Bilal
    et al.
    Univ Engn & Technol, Dept Telecommun Engn, ACTSENA Res Grp, Taxila, Punjab, Pakistan..
    Azam, Muhammad A.
    Univ Engn & Technol, Dept Telecommun Engn, ACTSENA Res Grp, Taxila, Punjab, Pakistan..
    Amin, Yasar
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Centra, VinnExcellence Center for Intelligence in Paper and Packaging, iPACK. KTH, Skolan för elektroteknik och datavetenskap (EECS), Elektronik. Univ Engn & Technol, Dept Telecommun Engn, ACTSENA Res Grp, Taxila, Punjab, Pakistan..
    Loo, Jonathan
    Middlesex Univ, Sch Engn & Informat Sci, Dept Comp Sci, London, England..
    Tenhunen, Hannu
    KTH, Skolan för elektroteknik och datavetenskap (EECS), Elektronik, Integrerade komponenter och kretsar.
    A high capacity tunable retransmission type frequency coded chipless radio frequency identification system2019Ingår i: International Journal of RF and Microwave Computer-Aided Engineering, ISSN 1096-4290, E-ISSN 1099-047X, Vol. 29, nr 9, artikel-id e21855Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    This article presents a 12-bit frequency coded chipless RFID system in the frequency range of 3 to 6 GHz. The system consists of a fully printable chipless tag and a pair of high-gain reader antennas. The tag also incorporates its own antennas to improve the read range. Information is encoded into frequency spectrum using a multi-resonant circuit. The circuit consists of multiple microstrip U and L-shaped open stub resonators patterned in a unique configuration. The proposed configuration aids in capturing more data in a reduced space as well as tunable frequency operation. Tag and reader antennas utilize techniques such as stepped impedance feeding line, defective partial ground plane, and stair-step patch structure to achieve wide-band impedance bandwidth in miniature size. The results of the wireless measurements in the non-anechoic environment show that the proposed system has a reading range of more than 20 cm. The presented system possesses great potential for low-cost short-range inventory tracking.

  • 6.
    Aslam, Bilal
    et al.
    Univ Engn & Technol, Dept Telecommun Engn, ACTSENA Res Grp, Taxila 47050, Punjab, Pakistan..
    Kashif, Muhammad
    Univ Engn & Technol, Dept Telecommun Engn, ACTSENA Res Grp, Taxila 47050, Punjab, Pakistan.;Beijing Univ Aeronaut & Astronaut, Beijing, Peoples R China..
    Azam, Muhammad Awais
    Univ Engn & Technol, Dept Telecommun Engn, ACTSENA Res Grp, Taxila 47050, Punjab, Pakistan..
    Amin, Yasar
    KTH, Skolan för elektroteknik och datavetenskap (EECS), Elektronik. Univ Engn & Technol, Dept Telecommun Engn, ACTSENA Res Grp, Taxila 47050, Punjab, Pakistan.
    Loo, Jonathan
    Univ West London, Sch Comp & Commun Engn, Dept Comp Sci, London, England..
    Tenhunen, Hannu
    KTH, Skolan för elektroteknik och datavetenskap (EECS), Elektronik. Univ Turku, Dept Informat Technol, TUCS, Turku, Finland..
    A low profile miniature RFID tag antenna dedicated to IoT applications2019Ingår i: Electromagnetics, ISSN 0272-6343, E-ISSN 1532-527X, Vol. 39, nr 6, s. 393-406Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    RFID tag antennas with stable performance on the diverse electromagnetic mounting platforms are an integral part of the ubiquitous RFID systems. This research article presents a novel tag antenna design that facilitates the said objective. The proposed antenna consists of a modified H-shaped slot structure that ensures considerable robustness from the application environment through confining the surface current density within the antenna structure. The antenna offers a tunable bandwidth of 40 MHz within the microwave band of (2.4-2.5) GHz. The proposed tag antenna exhibits excellent response on metallic platforms of different sizes and thicknesses with an effective gain of almost four times of that in free space. Furthermore, the designed tag antenna performs adequately well on low-medium permittivity dielectrics (glass, paper, and plastic) and RF absorbers (water). The free space and on-metal performance of the proposed tag antenna are verified by testing a prototype realized on the FR4 substrate.

  • 7. Aslam, Bilal
    et al.
    Khan, Umar Hasan
    Azam, Muhammad Awais
    Amin, Yasar
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Centra, VinnExcellence Center for Intelligence in Paper and Packaging, iPACK. KTH, Skolan för informations- och kommunikationsteknik (ICT), Elektronik. Univ Engn & Technol, Pakistan.
    Loo, Jonathan
    Tenhunen, Hannu
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Elektronik, Integrerade komponenter och kretsar. KTH, Skolan för informations- och kommunikationsteknik (ICT), Centra, VinnExcellence Center for Intelligence in Paper and Packaging, iPACK. Univ Turku, Finland.
    A compact implantable RFID tag antenna dedicated to wireless health care2017Ingår i: International Journal of RF and Microwave Computer-Aided Engineering, ISSN 1096-4290, E-ISSN 1099-047X, Vol. 27, nr 5, artikel-id e21094Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Implantable tag antennas are an integral component of contemporary pervasive patient monitoring setups envisioned to reduce the medical errors and improve the quality of health care facilities. These tags, embedded into the human body, transmit critical patient information to the external equipment via a wireless communication link. This research article presents an implantable compact folded dipole antenna of size 10 mm 3 15 mm 3 2 mm, designed to operate in the industrial-scientificmedical band (2.4-2.48GHz). A three-layered phantom representing the human arm is used to evaluate the subcutaneous antenna performance. The tag antenna embedded in the middle of the fat layer offers a maximum gain of 216.3 dBi. The tag antenna performance as a function of implant position and phantom dimensions is analyzed. Link budget calculations show that with the achieved antenna gain the link power exceeds the required power by 38.37 dBm, and hence wireless communication is viable.

  • 8. Habib, A.
    et al.
    Amin, Yasar
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Centra, VinnExcellence Center for Intelligence in Paper and Packaging, iPACK. University of Engineering and Technology (UET), Pakistan.
    Azam, M. A.
    Loo, J.
    Tenhunen, Hannu
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Elektronik, Integrerade komponenter och kretsar. KTH, Skolan för informations- och kommunikationsteknik (ICT), Centra, VinnExcellence Center for Intelligence in Paper and Packaging, iPACK. University of Turku, Finland.
    Frequency signatured directly printable humidity sensing tag using organic electronics2017Ingår i: IEICE Electronics Express, ISSN 1349-2543, E-ISSN 1349-2543, Vol. 14, nr 3Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    In this paper chipless RFID tag, capable of carrying 9-bit data is presented. The tag is optimized for several flexible substrates. With growing information and communication technology, sensor integration with data transmission has gained significant attention. Therefore, the tag with the same dimension is then optimized using paper substrate. For different values of permittivity, the relative humidity is observed. Hence, besides carrying information bits, the tag is capable of monitoring and sensing the humidity. The overall dimension of the tag comprising of 9 ring slot resonators is 7 mm. Due to its optimization on the paper substrate, the tag can be an ideal choice for deploying in various low-cost sensing applications.

  • 9. Habib, A.
    et al.
    Asif, R.
    Fawwad, M.
    Amin, Yasar
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Centra, VinnExcellence Center for Intelligence in Paper and Packaging, iPACK. University of Engineering and Technology, Pakistan.
    Loo, J.
    Tenhunen, Hannu
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Elektronik, Integrerade komponenter och kretsar. KTH, Skolan för informations- och kommunikationsteknik (ICT), Centra, VinnExcellence Center for Intelligence in Paper and Packaging, iPACK. University of Turku, Finland.
    Directly printable compact chipless RFID tag for humidity sensing2017Ingår i: IEICE Electronics Express, ISSN 1349-2543, E-ISSN 1349-2543, Vol. 14, nr 10Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    In this letter, 8-bit paper based printable chipless tag is presented. The tag not only justifies the green electronic concept but also it is examined for sensing functionality. The compact tag structure comprises of seven L-shaped and one I-shaped dipole structure. These conducting tracks/dipole structures are of silver nano-particle based ink having a conductivity of 1.1 × 107 S/m. Each conducting track yields one bit corresponding to one peak. The tag design is optimized and analyzed for three different flexible substrates i.e. paper, Kapton® HN, and PET. The tag has ability to identify 28 = 256 objects, by using different binary combinations. The variation in length of particular conducting strip results in a shift of peak for that specific conducting track. This shift corresponds to logic state-1. The response of the tag for paper, Kapton® HN, and PET substrates is observed in the frequency band of 2.2-6.1 GHz, 2.4-6.3 GHz, and 2.5-6.5 GHz, respectively. The tag has an attractive nature because of its easy printability and usage of low-cost, flexible substrates. The tag can be deployed in various low-cost sensing applications.

  • 10.
    Jabeen, Iqra
    et al.
    Univ Engn & Technol, ACTSENA Res Grp, Dept Telecommun Engn, Taxila 47050, Punjab, Pakistan..
    Ejaz, Asma
    Univ Engn & Technol, ACTSENA Res Grp, Dept Telecommun Engn, Taxila 47050, Punjab, Pakistan..
    Akram, Adeel
    Univ Engn & Technol, ACTSENA Res Grp, Dept Telecommun Engn, Taxila 47050, Punjab, Pakistan..
    Amin, Yasar
    KTH, Skolan för elektroteknik och datavetenskap (EECS), Elektroteknik, Elektronik och inbyggda system, Integrerade komponenter och kretsar. Univ Engn & Technol, ACTSENA Res Grp, Dept Telecommun Engn, Taxila 47050, Punjab, Pakistan.;Royal Inst Technol KTH, Dept Elect Syst, iPack Vinn Excellence Ctr, Stockholm, Sweden..
    Loo, Jonathan
    Middlesex Univ, Sch Engn & Informat Sci, Dept Comp Sci, London, England..
    Tenhunen, Hannu
    KTH, Skolan för elektroteknik och datavetenskap (EECS), Elektroteknik, Elektronik och inbyggda system, Integrerade komponenter och kretsar. Univ Turku, TUCS, Dept Informat Technol, Turku, Finland..
    Elliptical slot based polarization insensitive compact and flexible chipless RFID tag2019Ingår i: International Journal of RF and Microwave Computer-Aided Engineering, ISSN 1096-4290, E-ISSN 1099-047X, Vol. 29, nr 11, artikel-id e21734Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    A miniaturized, polarization insensitive, and fully passive chipless radio frequency identification tag is proposed in this research article. The realized tag is based on slotted elliptical structures in a nested loop fashion with identical lengths and widths of slot resonators. Alteration of data sequence is accomplished by addition and elimination of nested resonators in the geometric structure. The tag is capable to encode 10 bits of data and covers spectral range from 3.6 to 15.6 GHz. The formulated structure demonstrates polarization insensitive characteristic. The data encoding structure is analyzed and optimized for different substrates that are, Rogers RT/duroid/5880, Rogers RT/duroid/5870, and Taconic TLX-0 over the miniaturized footprint of 22.8 x 16 mm(2). The presented tag is robust, novel, compact, and flexible exhibiting a stable response to impinging electromagnetic waves at various angles of incidence.

  • 11.
    Javed, Aqsa
    et al.
    Univ Engn & Technol, Dept Telecommun Engn, ACTSENA Res Grp, Taxila 47050, Punjab, Pakistan.
    Ejaz, Asma
    ACTSENA Research Group, Department of Telecommunication Engineering, University of Engineering and Technology, Taxila, Punjab 47050, Pakistan.
    Mehak, Sumrin
    ACTSENA Research Group, Department of Telecommunication Engineering, University of Engineering and Technology, Taxila, Punjab 47050, Pakistan.
    Amin, Yasar
    KTH. ACTSENA Research Group, Department of Telecommunication Engineering, University of Engineering and Technology, Taxila, Punjab 47050, Pakistan.
    Tenhunen, Hannu
    KTH, Skolan för elektroteknik och datavetenskap (EECS), Elektronik, Integrerade komponenter och kretsar. Department of Information Technology, TUCS, University of Turku, Turku, 20520, Finland.
    Miniaturized cross-lines rectangular ring-shaped flexible multiband antenna2019Ingår i: Applied Computational Electromagnetics Society Journal, ISSN 1054-4887, Vol. 34, nr 5, s. 625-630Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    A compact, flexible antenna for wireless applications, i.e., WLAN/WiMAX/Wi-Fi, UMTS2100, C-Band, and DSRC is presented. The quad-band antenna is designed and analyzed in terms of efficiency, gain, radiation pattern, return loss, and VSWR. The optimized design consists of a CPW fed rectangular ring patch with the semi-circular ground. The cross-lines and the semicircular ground is investigated to ascertain the multiband effect. A concept of inset feed mechanism is also interpolated to enhance impedance matching. The framed antenna is examined under the bent condition as well. The reported work is an apt candidate for the proposed applications because of its high efficiency of 95% with a peak gain of 3.22 dBi along with VSWR less than 2. With stable radiation pattern and bandwidth, there is a justified concurrence between simulated and measured results.

  • 12. Khan, Aamir
    et al.
    Naqvi, Syeda I.
    Arshad, Farzana
    Amin, Yasar
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Centra, VinnExcellence Center for Intelligence in Paper and Packaging, iPACK.
    Tenhunen, Hannu
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Elektronik, Integrerade komponenter och kretsar. KTH, Skolan för informations- och kommunikationsteknik (ICT), Centra, VinnExcellence Center for Intelligence in Paper and Packaging, iPACK. Åbo universitet, Finland.
    A Compact Quad-band CPW-fed Planar Resonator for Multiple Wireless Communication Applications2017Ingår i: Applied Computational Electromagnetics Society Journal, ISSN 1054-4887, Vol. 32, nr 11, s. 1001-1007Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    This article presents a low-cost, compact antenna with coplanar waveguide (CPW) feed line for multiband wireless applications. The presented multiband radiator is envisioned for integration into microwave circuits and portable RF devices. The prototype is realized on 1.6 mm thick readily available FR4 substrate with a compact geometrical size of 24x32 mm(2). The acquired quad-bands are centered at: 2.45, 3.5, 5.2 and 5.8 GHz justifying the appropriateness of the proposed radiator for the WLAN and WiMAX applications, as well as Bluetooth and ISM wireless standards. From the aspect of integration into transportable handheld devices and system designing, the presented compact antenna illustrates more expandability and flexibility. The radiation characteristics measured in the E and H-planes for desired operating frequencies are monopole-like and omni-directional, respectively. A sufficient gain is also achieved. Simulated as well as experimental results exhibit agreeable behavior.

  • 13.
    Khan, Tayyaba
    et al.
    Univ Engn & Technol, Dept Telecommun Engn, Taxila 47050, Pakistan..
    Rahman, MuhibUr
    Polytech Montreal, Dept Elect Engn, Montreal, PQ H3T 1J4, Canada..
    Akram, Adeel
    Univ Engn & Technol, Dept Telecommun Engn, Taxila 47050, Pakistan..
    Amin, Yasar
    KTH, Skolan för elektroteknik och datavetenskap (EECS), Elektronik. Univ Engn & Technol, Dept Telecommun Engn, Taxila 47050, Pakistan..
    Tenhunen, Hannu
    KTH, Skolan för elektroteknik och datavetenskap (EECS), Elektronik.
    A Low-Cost CPW-Fed Multiband Frequency Reconfigurable Antenna for Wireless Applications2019Ingår i: ELECTRONICS, ISSN 2079-9292, Vol. 8, nr 8, artikel-id 900Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    A novel, cedar-shaped, coplanar waveguide-fed frequency reconfigurable antenna is proposed. The presented antenna uses low-cost FR4 substrate with a thickness of 1.6 mm. Four PIN diodes are inserted on the antenna surface to variate the current distribution and alter the resonant frequencies with different combinations of switches. The proposed antenna is fabricated and measured for all states, and a good agreement is seen between measured and simulated results. This antenna resonates within the range of 2 GHz to 10 GHz, covering the major wireless applications of aviation service, wireless local area network (WLAN), worldwide interoperability for microwave access (WiMAX), long distance radio telecommunications, and X-band satellite communication. The proposed antenna works resourcefully with reasonable gain, significant bandwidth, directivity, and reflection coefficient. The proposed multiband reconfigurable antenna will pave the way for future wireless communications including WLAN, WiMAX, and possibly fifth-generation (5G) communication.

  • 14. Khan, Umar Hasan
    et al.
    Rasheed, Hira
    Aslam, Bilal
    Fatima, Ammara
    Shahid, Laiba
    Amin, Yasar
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Centra, VinnExcellence Center for Intelligence in Paper and Packaging, iPACK.
    Tenhunen, Hannu
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Centra, VinnExcellence Center for Intelligence in Paper and Packaging, iPACK.
    Localization of Compact Circularly Polarized RFID Tag Using ToA Technique2017Ingår i: Radioengineering, ISSN 1210-2512, E-ISSN 1805-9600, Vol. 26, nr 1, s. 147-153Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    A compact, flexible crossed-dipole circularly polarized antenna using commercially available paper substrate is presented which caters North American frequency band. The crossed-dipoles have meandered lines for reduction of size as well as increased inductivity in the antenna. Dipoles have asymmetric T-shaped rectangular endings to provide the required compactness. Two semicircles are induced between the orthogonal dipoles and meandering matching structure to accomplish circular polarization excitation. Good impedance matching with the chip is achieved through a modified meander line matching structure. The proposed design dimensions are 32 x 32 x 0.4 mm(3). Systematic analysis revealed the results comprising circular polarization 3dB-AR bandwidth of 12 MHz (908-920 MHz) and power transmission coefficient bandwidth of 36 MHz (900-936 MHz). Time delay between interrogating signal and backscattered signal is measured and relative distance is calculated. Linear Least Square (LLS) method is applied to approximate the position of tag in interrogation area. The proposed tag is placed at known locations and its position is measured to analyze accuracy of the method by simulating the positioning algorithm code in MATLAB. Six valid tag positions 0.5-2 m read range and 0 degrees-150 degrees angular resolution has been investigated.

  • 15. Satti, Javeria Anum
    et al.
    Habib, Ayesha
    Anam, Hafsa
    Zeb, Sumra
    Amin, Yasar
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Centra, VinnExcellence Center for Intelligence in Paper and Packaging, iPACK. KTH, Skolan för elektroteknik och datavetenskap (EECS), Elektronik.
    Loo, Jonathan
    Tenhunen, Hannu
    KTH, Skolan för elektroteknik och datavetenskap (EECS), Elektronik, Integrerade komponenter och kretsar.
    Miniaturized humidity and temperature sensing RFID enabled tags2018Ingår i: International Journal of RF and Microwave Computer-Aided Engineering, ISSN 1096-4290, E-ISSN 1099-047X, Vol. 28, nr 1, artikel-id e21151Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    A compact 27-bit linearly polarized chipless radio frequency identification tag is presented in this research. The proposed tag is designed with an overall tag dimension of 23 x 23 mm(2). The tag comprises of metallic (copper) rings-based structure loaded with slots. These slots correspond to a particular sequence of bits. The circular tag is analysed using 2 different substrates, that is, Rogers RT/duroid/5870 and flexible Rogers RT/duroid/5880. The radar cross-section response of frequency signatured tag is analysed for humidity and temperature sensor designs. Humidity sensing is achieved by deploying a DuPont Kapton HN heat resistant sheet on the shortest slot of the tag, that is, the sensing slot. Temperature sensing is attained using Rogers RT/duroid/5870 and Stanyl polyamide as a combined substrate. Hence, the miniaturized, robust, and flexible tag can be deployed over irregular surfaces for sensing purposes.

  • 16.
    Shahid, Humayun
    et al.
    Univ Engn & Technol, Dept Telecommun Engn, ACTSENA, Taxila 47050, Punjab, Pakistan. min, Yasar; Tenhunen, Hannu.
    Riaz, Muhammad Ali
    Amin, Yasar
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Centra, VinnExcellence Center for Intelligence in Paper and Packaging, iPACK.
    Akram, Adeel
    Loo, Jonathan
    Tenhunen, Hannu
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Centra, VinnExcellence Center for Intelligence in Paper and Packaging, iPACK.
    Novel QR-incorporated chipless RFID tag2019Ingår i: IEICE Electronics Express, ISSN 1349-2543, E-ISSN 1349-2543, Vol. 16, nr 5, artikel-id 20180843Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    This work ideates a novel approach for designing a QR-incorporated data encoding structure that functions as a fully-passive, chipless radio frequency identification (RFID) tag. Several concentric square-shaped resonant slots embedded strategically within a QR-patterned region constitute the tag. A functional prototype is realized over an ungrounded Duroid (R) 5880 substrate, and the same is evaluated for its electromagnetic performance. The tag performs encoding of up to 118 data bits distributed across spectral and optical domain in a compact form factor measuring 55 x 55 mm(2). Possible applications of the formulated tag include multi-layer authentication for secure access control in smart cities and connected homes.

  • 17.
    Tariq, N.
    et al.
    University of Engineering and Technology, Taxila.
    Riaz, M. A.
    University of Engineering and Technology, Taxila.
    Shahid, H.
    University of Engineering and Technology, Taxila.
    Khan, M. J.
    University of Engineering and Technology, Taxila.
    Amin, Yasar
    University of Engineering and Technology, Taxila.
    Tenhunen, Hannu
    KTH, Skolan för elektroteknik och datavetenskap (EECS), Elektroteknik, Elektronik och inbyggda system, Integrerade komponenter och kretsar. University of Turku, Finland..
    A Novel Kite-Shaped Chipless RFID Tag for Low-Profile Applications2019Ingår i: IETE Journal of ResearchArtikel i tidskrift (Refereegranskat)
    Abstract [en]

    n this paper a novel, compact 10-bit chipless radio frequency identification (RFID) tag with stable readable characteristics is proposed. The tag is composed of several concentric novel kite-shaped loop resonators. The desired data sequence is obtained by the insertion or removal of nested elements, offering a 1:1 data bit to resonance correspondence. Each data sequence is encoded in the spectral domain of the tag. The proposed tag shows operability at different polarizations and incident angles of the impinging electromagnetic waves. Operating within the ultra-wideband (UWB), the tag is realized on the Roger RT/duroid® 5880 substrate having physical dimensions of 13.55 × 13.55 mm2. The measurement results of the design reveal a high code density and spectral efficiency of 5.44 bits/cm2 and 2 bits/GHz, respectively. The compact and robust passive chipless RFID tag having scalable data storage potential can be deployed in numerous low-profile applications such as those of wearable and healthcare.

  • 18. Ul Hassan, Mubashir
    et al.
    Arshad, Farzana
    Naqvi, Syeda Iffat
    Amin, Yasar
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Centra, VinnExcellence Center for Intelligence in Paper and Packaging, iPACK. Univ Engn & Technol, Pakistan.
    Tenhunen, Hannu
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Elektronik, Integrerade komponenter och kretsar. KTH, Skolan för informations- och kommunikationsteknik (ICT), Centra, VinnExcellence Center for Intelligence in Paper and Packaging, iPACK. Univ Turku, Finland.
    A Compact Flexible and Frequency Reconfigurable Antenna for Quintuple Applications2017Ingår i: Radioengineering, ISSN 1210-2512, E-ISSN 1805-9600, Vol. 26, nr 3, s. 655-661Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    A novel, compact coplanar waveguide-fed flexible antenna is presented. The proposed design uses flexible Rogers RT/duroid 5880 (0.508 mm thickness) as a substrate with small size of 30 x 28.4 mm(2). Two switches are integrated on the antenna surface to change the current distribution which consequently changes the resonance frequency under different conditions of switches, thereby making it a frequency reconfigurable antenna. The antenna design is simulated on CST (R) MWS (R). The proposed antenna exhibits VSWR < 2 and appreciable radiation patterns with positive gain over desired frequency bands. Good agreement exists between simulated and measured results. On the basis of results, the proposed antenna is envisioned to be deployed for the following applications; aeronautical radio navigation [4.3 GHz], AMT fixed services [4.5 GHz], WLAN [5.2 GHz], Unlicensed WiMAX [5.8 GHz] and X-band [7.5 GHz].

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