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  • 1. Aslam, B.
    et al.
    Khan, U. H.
    Azam, M. A.
    Amin, Yasar
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Elektronik. KTH, Skolan för informations- och kommunikationsteknik (ICT), Centra, VinnExcellence Center for Intelligence in Paper and Packaging, iPACK.
    Loo, J.
    Tenhunen, Hannu
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Elektronik. KTH, Skolan för informations- och kommunikationsteknik (ICT), Centra, VinnExcellence Center for Intelligence in Paper and Packaging, iPACK.
    Miniaturized decoupled slotted patch RFID tag antennas for wearable health care2017Ingår i: International Journal of RF and Microwave Computer-Aided Engineering, ISSN 1096-4290, E-ISSN 1099-047X, Vol. 27, nr 1, artikel-id e21048Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    In this article, a couple of two-layered RFID tag antenna designs exhibiting improved performance descriptors for on-body applications are presented. The antennas are designed to operate in the microwave band (2.4–2.48 GHz) ensuring high data transmission rates ideal for real-time subject monitoring applications. The radiating element of both the antennas is a slotted patch structure provisioned with a pair of T-shaped slots realized on a commercial FR4 substrate. The augmentation of a systematic sequence of narrow comb-like etchings into the design enhances the impedance bandwidth considerably. A high permittivity silicon layer embedded with the radiating patch provides resilience from the human body dielectric losses. A modified antenna design utilizing patch miniaturization technique, resulting in an overall footprint reduction by 32%, is also proposed. The designed tag antennas offer a gain of more than 1.8 dBi and an attractive read range greater than 6.8 m in the operating band.

  • 2.
    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.

  • 3. 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.

  • 4.
    Isaksson, Magnus
    et al.
    Department of Electronics, University of Gävle.
    Rönnow, Daniel
    Department of Electronics, University of Gävle.
    A Parameter-Reduced Volterra Model for Dynamic RF Power Amplifier Modeling based on Orthonormal Basis Functions2007Ingår i: International Journal of RF and Microwave Computer-Aided Engineering, ISSN 1096-4290, E-ISSN 1099-047X, Vol. 17, nr 6, s. 542-551Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    A nonlinear dynamic behavioral model for radio frequency power amplifiers is presented. It uses orthonormal basis functions, Kautz functions, with complex poles that are different for each nonlinear order. It has the same general properties as Volterra models, but the number of parameters is significantly smaller. Using frequency weighting the out-of-band model error can be reduced. Using experimental data it was found that the optimal poles were the same for different input powers and for the different nonlinear orders. The optimal poles were also the same for direct and inverse models, which could be explained theoretically to be a general property of nonlinear systems with negligible linear memory effects. The model can be used as either a direct or inverse model with the same model error for power amplifiers with negligible linear memory effects.

  • 5.
    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.

  • 6.
    Landin, Per N.
    et al.
    KTH, Skolan för elektro- och systemteknik (EES), Signalbehandling.
    Isaksson, Magnus
    Högskolan i Gävle, Ämnesavdelningen för elektronik.
    Händel, Peter
    KTH, Skolan för elektro- och systemteknik (EES), Signalbehandling. KTH, Skolan för elektro- och systemteknik (EES), Centra, ACCESS Linnaeus Centre.
    Parameter Extraction and Performance Evaluation Method for Increased Performance in RF Power Amplifier Behavioral Modeling2010Ingår i: International Journal of RF and Microwave Computer-Aided Engineering, ISSN 1096-4290, E-ISSN 1099-047X, Vol. 20, nr 2, s. 200-208Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    A frequency-weighted parameter extraction method based on the performance evaluation criterion weighted error spectral power ratio (WESPR) is proposed. Performance of models extracted using the normalized mean square error (NMSE) are compared to the performances of models extracted using the WESPR. The results show an increase in performance with a decrease in model complexity.

  • 7. Liu, Hui
    et al.
    Liu, Cheng
    Dai, Xin
    He, Sailing
    KTH, Skolan för elektro- och systemteknik (EES), Elektroteknisk teori och konstruktion. South China Normal University, Guangzhou, China.
    Design of novel compact dual-band filtering power divider using stepped-impedance resonators with high selectivity2016Ingår i: International Journal of RF and Microwave Computer-Aided Engineering, ISSN 1096-4290, E-ISSN 1099-047X, Vol. 29, nr 3, s. 262-267Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    A novel compact dual-band power divider with filtering responses is presented in this article. The proposed circuit utilizes coupled quarter-wavelength stepped-impedance resonators. By controlling these resonators, dual-band operation can be realized. Furthermore, a resistor is connected between the two open ends of the input feed line to obtain good isolation at two bands. Source load coupling is utilized to enhance the selectivity. To verify the proposed idea, a filtering power divider with the operating frequencies of 2.4 and 5.8 GHz is implemented. Good agreement between the simulated and measured results validates the proposed idea. The total size of the circuit is 0.23(g) x 0.28(g), where (g) is the guide wavelength of 2.4 GHz. 

  • 8. 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.

  • 9. Xiao, Fei
    et al.
    Norgren, Martin
    KTH, Skolan för elektro- och systemteknik (EES), Elektroteknisk teori och konstruktion.
    He, Sailing
    KTH, Skolan för elektro- och systemteknik (EES), Elektroteknisk teori och konstruktion.
    Quasi-TEM approach of coupled-microstrip lines and its application to the analysis of microstrip filters2012Ingår i: International Journal of RF and Microwave Computer-Aided Engineering, ISSN 1096-4290, E-ISSN 1099-047X, Vol. 22, nr 1, s. 131-139Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    In this article, the quasi-TEM approach is successfully used to analyze coupled-microstrip lines of finite length, which are usually used for the coupling between the source/load and resonators in microstrip filters. First, an orthogonal expansion method is used to extract the per-length inductance and capacitance matrices. The authors then obtain the impedance matrix or admittance matrix, which relates the voltages and currents at both ends of coupled-microstrip lines. To verify our theory, an example is presented, i.e., a Y-shaped dual-mode bandpass microstrip filter, for which, the equivalent circuit model based on the quasi-TEM analysis of coupled-microstrip lines is accurately set up. The approach in this article is applicable to planar microstrip lines with arbitrary number of conductors, under the quasi-TEM assumption.

  • 10.
    Zahra, Anum
    et al.
    Univ Engn & Technol, Dept Telecommun Engn, ACTSENA Res Grp, Taxila 47050, Punjab, Pakistan..
    Shahid, Humayun
    Univ Engn & Technol, Dept Telecommun Engn, ACTSENA Res Grp, Taxila 47050, Punjab, Pakistan..
    Riaz, Muhammad Ali
    Univ Engn & Technol, Dept Telecommun Engn, ACTSENA Res Grp, Taxila 47050, Punjab, Pakistan..
    Amin, Yasar
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Centra, VinnExcellence Center for Intelligence in Paper and Packaging, iPACK. Univ Engn & Technol, Dept Telecommun Engn, ACTSENA Res Grp, Taxila 47050, Punjab, 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..
    A chipless RFID tag for smart temporal applications2018Ingår i: International Journal of RF and Microwave Computer-Aided Engineering, ISSN 1096-4290, E-ISSN 1099-047X, Vol. 28, nr 8, artikel-id e21405Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    A compact, robust, chipless radio frequency identification (RFID) tag is proposed. Resonant elements patterned in a concentric fashion encode data in the spectral domain employing frequency shift encoding. The proposed tag encodes 28.25 data bits over a miniscule physical footprint of 25 x 25 mm(2). The formulated scheme is demonstrated to be viable for encoding of temporal variables. The electromagnetic performance of the presented design is investigated for different laminates: Rogers RT/duroid (R) 5880 and Taconic TLX-0. Multiple tag prototypes employing a variety of substrates are realized and evaluated for in-laboratory performance. The proposed design is compared with existing work reported in literature. Code density of 4.52 bits/cm(2) has been successfully achieved. The tag design operates from 3.07 to 10.6 GHz and is readily realizable on flexible laminates. Smart retail, intelligent packaging, adaptive ticketing, and similar time-related applications can be materialized using the proposed tag.

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