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Emadeddin, A. & Jonsson, B. L. (2024). A Fully Integrated Filtering Vivaldi Antenna With High Selectivity and Wide Out-of-Band Suppression. IEEE Access, 12, 2690-2700
Open this publication in new window or tab >>A Fully Integrated Filtering Vivaldi Antenna With High Selectivity and Wide Out-of-Band Suppression
2024 (English)In: IEEE Access, E-ISSN 2169-3536, Vol. 12, p. 2690-2700Article in journal (Refereed) Published
Abstract [en]

This paper introduces a novel filtering approach that employs integrated periodic structures with a conventional Vivaldi antenna to achieve a fully integrated bandpass filtering antenna. The approach results in a wide out-of-band suppression, high passband selectivity, adjustable operational bandwidth, and low insertion loss. The proposed filtering approach maintains the original size of the conventional Vivaldi antenna (base antenna) without requiring additional modifications. To validate the approach, we present two filtering Vivaldi antennas: filtering antenna I (center frequency: 18GHz, fractional bandwidth: 21%, insertion loss: 0.32dB) and filtering antenna II (center frequency: 6.5GHz, fractional bandwidth: 12%, insertion loss: 0.6dB). Their wide out-of-band gain suppression (typically >= 15dB) covers the conventional Vivaldi antenna's frequency range (4-24GHz). A prototype of the filtering antenna I is manufactured. Its measurement results validate the proposed approach and show good agreement with the simulated reflection coefficient, realized gain, and radiation patterns. The features of the proposed filtering antenna approach, make it suitable for various applications requiring efficient frequency filtering.

Place, publisher, year, edition, pages
Institute of Electrical and Electronics Engineers (IEEE), 2024
Keywords
Filtering, Antennas, Vivaldi antennas, Bandwidth, Band-pass filters, Passband, Slot antennas, Filtering antenna, fully integrated antenna design, metasurface, out-of-band suppression, wideband antenna, filtenna
National Category
Signal Processing Other Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:kth:diva-342720 (URN)10.1109/ACCESS.2023.3348751 (DOI)001140279900001 ()2-s2.0-85181556812 (Scopus ID)
Note

QC 20240216

Available from: 2024-02-16 Created: 2024-02-16 Last updated: 2024-05-10Bibliographically approved
Hultin, H., Frid, H., Jonsson, B. L. & Malmström, J. (2024). Investigation of Near-Field Contribution in Shooting and Bouncing Rays for Installed Antenna Performance on a Simple Platform. In: 18th European Conference on Antennas and Propagation, EuCAP 2024: . Paper presented at 18th European Conference on Antennas and Propagation, EuCAP 2024, Glasgow, United Kingdom of Great Britain and Northern Ireland, Mar 17 2024 - Mar 22 2024. Institute of Electrical and Electronics Engineers (IEEE)
Open this publication in new window or tab >>Investigation of Near-Field Contribution in Shooting and Bouncing Rays for Installed Antenna Performance on a Simple Platform
2024 (English)In: 18th European Conference on Antennas and Propagation, EuCAP 2024, Institute of Electrical and Electronics Engineers (IEEE) , 2024Conference paper, Published paper (Refereed)
Abstract [en]

The near-field contribution in the high-frequency method Shooting and Bouncing Rays (SBR) is investigated for installed antenna performance. Three SBR solvers, the in-house solver SIENT and two commercial solvers, are compared to a commercial full-wave solver. SIENT and one commercial solver have an option to disable near-field effects, which allows the strength of these effects to be investigated. The last solver also includes near-field effects. The results indicate an increase in accuracy when including near-field effects. The most notable difference in the far-field phase and the induced surface current are obtained for the in-house solver. Improvements for the surface current density is seen close to the antenna. On the tested platform, the difference in gain is not as notable but it is overestimated for both the in-house solver and the commercial solvers when excluding near-field terms.

Place, publisher, year, edition, pages
Institute of Electrical and Electronics Engineers (IEEE), 2024
Keywords
Computational Electromagnetics (CEM), Installed Antenna Performance, Near-Field, Shooting and Bouncing Rays (SBR)
National Category
Fluid Mechanics and Acoustics
Identifiers
urn:nbn:se:kth:diva-346526 (URN)10.23919/EuCAP60739.2024.10500933 (DOI)2-s2.0-85192477107 (Scopus ID)
Conference
18th European Conference on Antennas and Propagation, EuCAP 2024, Glasgow, United Kingdom of Great Britain and Northern Ireland, Mar 17 2024 - Mar 22 2024
Note

QC 20240520

Part of ISBN 978-88-31299-09-1

Available from: 2024-05-16 Created: 2024-05-16 Last updated: 2024-05-20Bibliographically approved
Jonsson, B. L. (2024). Model Order Reduction for Parametric Dependence of Q-factor Bounds in IoT Applications. In: 18th European Conference on Antennas and Propagation, EuCAP 2024: . Paper presented at 18th European Conference on Antennas and Propagation, EuCAP 2024, Glasgow, United Kingdom of Great Britain and Northern Ireland, Mar 17 2024 - Mar 22 2024. Institute of Electrical and Electronics Engineers (IEEE)
Open this publication in new window or tab >>Model Order Reduction for Parametric Dependence of Q-factor Bounds in IoT Applications
2024 (English)In: 18th European Conference on Antennas and Propagation, EuCAP 2024, Institute of Electrical and Electronics Engineers (IEEE) , 2024Conference paper, Published paper (Refereed)
Abstract [en]

In Internet of Things (IoT) applications the antennas are often electrically small at their radiation frequency. This makes it hard to design antennas that meet desired bandwidth requirements. It is therefore interesting to consider the trade-off between antenna size and antenna position within the terminal with respect to its available bandwidth, as characterized by the Q-factor bound. To determine these quantities are associated with solving a non-trivial optimization problem. Recent development of model order reduction techniques can include parametric dependencies. Here we apply the data-driven Loewner framework to the Q-factors as a function of size and position parameters, to investigate how well these methods work for the Q-factor bounds in IoT applications. We show that the Loewner framework can deliver a reduced-order model of the bound. Properties of the reduced model can be used to indicate how well the reduced order interpolates the parametric dependence.

Place, publisher, year, edition, pages
Institute of Electrical and Electronics Engineers (IEEE), 2024
Keywords
antennas, internet of things, Loewner framework, Model order reduction, Q-factor bounds
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:kth:diva-346515 (URN)10.23919/EuCAP60739.2024.10501045 (DOI)2-s2.0-85192443696 (Scopus ID)
Conference
18th European Conference on Antennas and Propagation, EuCAP 2024, Glasgow, United Kingdom of Great Britain and Northern Ireland, Mar 17 2024 - Mar 22 2024
Note

QC 20240521

Part of ISBN 978-883129909-1

Available from: 2024-05-16 Created: 2024-05-16 Last updated: 2024-05-21Bibliographically approved
Jonsson, B. L. & Hultin, H. (2024). On Efficient Representations of Frequency Dependent Far-Field Information for Array Antennas. In: 18th European Conference on Antennas and Propagation, EuCAP 2024: . Paper presented at 18th European Conference on Antennas and Propagation, EuCAP 2024, Glasgow, United Kingdom of Great Britain and Northern Ireland, Mar 17 2024 - Mar 22 2024. Institute of Electrical and Electronics Engineers (IEEE)
Open this publication in new window or tab >>On Efficient Representations of Frequency Dependent Far-Field Information for Array Antennas
2024 (English)In: 18th European Conference on Antennas and Propagation, EuCAP 2024, Institute of Electrical and Electronics Engineers (IEEE) , 2024Conference paper, Published paper (Refereed)
Abstract [en]

This paper investigates the number of required data points to accurately represent the vector far-field information over the radiation sphere and its frequency variation for array antennas. The method needs to be explicit in terms of the excitation of the elements. We compare representations of far-field data on the sphere with two different approaches to spherical wave expansion representations and apply a data-driven model-order reduction to find a small-size representation. As is well known, a spherical wave expansion strongly reduces the number of required data points. Here, we show that accounting for the phase center of the elements further strongly reduces the number of required coefficients in the tested cases. The Loewner framework datadriven model-order reduction shrinks the required far-field data by an additional factor of 8-14 per mode coefficients, depending on the acceptable level of error. This reduction works well for the two investigated cases.

Place, publisher, year, edition, pages
Institute of Electrical and Electronics Engineers (IEEE), 2024
Keywords
array antennas, far-fields, model order reduction, spherical vector modes
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:kth:diva-346532 (URN)10.23919/EuCAP60739.2024.10501604 (DOI)2-s2.0-85192478675 (Scopus ID)
Conference
18th European Conference on Antennas and Propagation, EuCAP 2024, Glasgow, United Kingdom of Great Britain and Northern Ireland, Mar 17 2024 - Mar 22 2024
Note

QC 20240521

Part of ISBN 978-88-31299-09-1

Available from: 2024-05-16 Created: 2024-05-16 Last updated: 2024-05-21Bibliographically approved
Emadeddin, A. & Jonsson, B. L. (2024). Wide-Scan Active Highly Integrated Phased Array Antenna for Tx/Rx Application at K-Band. In: 2024 18th European Conference on Antennas and Propagation (EuCAP): . Paper presented at 2024 18th European Conference on Antennas and Propagation (EuCAP), Glasgow, United Kingdom, Date of Conference: 17-22 March 2024. Institute of Electrical and Electronics Engineers (IEEE)
Open this publication in new window or tab >>Wide-Scan Active Highly Integrated Phased Array Antenna for Tx/Rx Application at K-Band
2024 (English)In: 2024 18th European Conference on Antennas and Propagation (EuCAP), Institute of Electrical and Electronics Engineers (IEEE) , 2024Conference paper, Published paper (Refereed)
Abstract [en]

A new wide-scan active direct-integrated phased array antenna (AIPAA), designed for Tx/Rx mm-Wave applications, is introduced in this paper. This novel AIPAA offers seamless switching performance between transmitting (Tx) and receiving (Rx) modes without the need for lossy intermediate RF components, such as RF switches, circulators, and duplexers. The unitcell of the AIPAA consists of three miniaturized tapered slot elements operating in the K-band frequency range. In the Tx mode, a GaN high electron mobility transistor serves as the power amplifier (PA), while in the Rx mode, a GaAs MMIC low noise amplifier (LNA) is employed. The unticell's center antenna element is reshaped to match closely to the optimal load impedance of the PA ( Zopt=6+j36Ω ) while the other elements are tuned to maintain a 50Ω input impedance suitable for the LNA. This direct integration approach enhances system efficiency and reduces the cost and size by eliminating the need for any intermediate impedance matching networks and RF switching components. The proposed Tx/Rx AIPAA achieves a matching at both the PA (optimum load) and LNA ( 50Ω ) ports with a 6% and 16% fractional bandwidth over ±50° scan coverage, respectively. The switching capability is incorporated by utilizing the ON/OFF modes of the PA and LNA DC-biasing. The proposed AIPAA's cell size is 9.2×6.5×1.8 mm3(0.67×0.5×0.13λ3) .

Place, publisher, year, edition, pages
Institute of Electrical and Electronics Engineers (IEEE), 2024
National Category
Communication Systems
Research subject
Electrical Engineering
Identifiers
urn:nbn:se:kth:diva-346264 (URN)10.23919/EuCAP60739.2024.10500931 (DOI)2-s2.0-85192462285 (Scopus ID)
Conference
2024 18th European Conference on Antennas and Propagation (EuCAP), Glasgow, United Kingdom, Date of Conference: 17-22 March 2024
Funder
Swedish Foundation for Strategic ResearchVinnova
Note

Part of ISBN 978-88-31299-09-1

QC 20240513

Available from: 2024-05-10 Created: 2024-05-10 Last updated: 2024-05-16Bibliographically approved
Emadeddin, A. & Jonsson, B. L. (2023). Coupling reduction in an active highly integrated Tx phased array antenna with scanning capability. AEU - International Journal of Electronics and Communications, 169, Article ID 154717.
Open this publication in new window or tab >>Coupling reduction in an active highly integrated Tx phased array antenna with scanning capability
2023 (English)In: AEU - International Journal of Electronics and Communications, ISSN 1434-8411, E-ISSN 1618-0399, Vol. 169, article id 154717Article in journal (Refereed) Published
Abstract [en]

This paper presents a novel method for analyzing and reducing the total coupled power in the Active Highly Integrated Phased Array Antennas (AIPAA), incorporating both the nonlinear impacts of the power amplifier (PA) transfer functions and the normalized scattering matrix. The proposed method introduces a new degree of freedom to reduce the coupling level utilizing two key factors: (i) the balance between the PAs’ transfer function gain and the coupled power difference to the PAs’ gate and drain/antenna ports, and (ii) the out-of-phase sum based on PAs’ transfer function phase response. The proposed method is theoretically demonstrated by accounting for all tones and also is subsequently simplified for the main tone. The method is practically validated by applying the method to a 1 × 5 AIPAA structure to reduce the total coupled power at its drain/antenna port. The results demonstrate a coupling reduction of −5 dB as an average with a maximum reduction of −20 dB, over a scan coverage of ±30∘ and 10% fractional bandwidth at 22 GHz for the center cell.

Place, publisher, year, edition, pages
Elsevier BV, 2023
Keywords
Active integrated phased array antennas, Beam steering, Coupling reduction, High integration, Mutual coupling
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering Telecommunications
Identifiers
urn:nbn:se:kth:diva-331498 (URN)10.1016/j.aeue.2023.154717 (DOI)001021040700001 ()2-s2.0-85160725630 (Scopus ID)
Note

QC 20230710

Available from: 2023-07-10 Created: 2023-07-10 Last updated: 2024-05-10Bibliographically approved
Jonsson, B. L. & Ferrero, F. (2023). On Small Antennas with Circular Polarization, Bandwidth Estimates and Design Considerations. In: 17th European Conference on Antennas and Propagation, EUCAP: . Paper presented at 17th European Conference on Antennas and Propagation (EuCAP), Mars 26-31, 2023, Florence, Italy. Institute of Electrical and Electronics Engineers (IEEE)
Open this publication in new window or tab >>On Small Antennas with Circular Polarization, Bandwidth Estimates and Design Considerations
2023 (English)In: 17th European Conference on Antennas and Propagation, EUCAP, Institute of Electrical and Electronics Engineers (IEEE), 2023Conference paper, Published paper (Refereed)
Abstract [en]

Circular polarization is an essential feature for small antennas designed to connect with satellite navigation systems. Here, a Q-factor optimization problem constrained with a circular polarization radiation requirement is formulated and solved. The constrained problem is shown to be solvable as fast as calculating the Q-factor bound without the constraint. Two antenna models are designed to assess the bounds. One aims for bandwidth, and the other for circular polarisation. The well-known relation between the Q-factor and the available bandwidth is used to evaluate the designs. The circularly polarised antenna is close to the bound and has a wide field of view. The Q-factor bound provides insight into desirable antenna positions on the small device.

Place, publisher, year, edition, pages
Institute of Electrical and Electronics Engineers (IEEE), 2023
Series
Proceedings of the European Conference on Antennas and Propagation, ISSN 2164-3342
Keywords
Circular Polarization, Q-factor bounds, antenna, GNSS
National Category
Telecommunications
Identifiers
urn:nbn:se:kth:diva-335876 (URN)10.23919/EuCAP57121.2023.10133768 (DOI)001023316903142 ()2-s2.0-85162258109 (Scopus ID)
Conference
17th European Conference on Antennas and Propagation (EuCAP), Mars 26-31, 2023, Florence, Italy
Note

Part of ISBN 978-88-31299-07-7

QC 20230911

Available from: 2023-09-11 Created: 2023-09-11 Last updated: 2023-11-06Bibliographically approved
Emadeddin, A. & Jonsson, B. L. (2023). Wide Scan, Active K-Band, Direct-Integrated Phased Array for Efficient High-Power Tx-Generation. IEEE Transactions on Antennas and Propagation, 71(9), 7579-7584
Open this publication in new window or tab >>Wide Scan, Active K-Band, Direct-Integrated Phased Array for Efficient High-Power Tx-Generation
2023 (English)In: IEEE Transactions on Antennas and Propagation, ISSN 0018-926X, E-ISSN 1558-2221, Vol. 71, no 9, p. 7579-7584Article in journal (Refereed) Published
Abstract [en]

In this communication, we propose a new wide-scan active direct-integrated 1×5 phased array antenna (AIPAA) for mm-Wave applications. The AIPAA's unit-cell comprises three K-band miniaturized tapered slot elements, a GaN high electron mobility transistor (HEMT) as a power amplifier (PA), a stability circuit, an input matching network (M.N.), and biasing components. The tapered slot antenna element is reshaped so that its input impedance closely matches the optimal load impedance of the HEMT (Zopt = 6 + j38 Ω at 22 GHz), which enhances the system efficiency. The peak-integrated PAs' power-added efficiency (PAEp) is ≥ 56 % with ≤ 9% variation over scan coverage (g±50°) at 1.5 dB power backoff from P1dB. The peak AIPAA system power-added efficiency (PAEs) is 51% with a peak array radiation efficiency of 92%. The relative frequency bandwidth with PAEp above 25% is between 9% and 13% over the scan range. The proposed AIPAA demonstrates less than 0.9 and 1 dB scanloss over the scan coverage in terms of antenna array gain and PAs' power gain (Gp), respectively. The peak PA-integrated array gain and EIRP at P1dB of 24 dBi and 51 dBm are achieved, respectively. The proposed AIPAA's size is 18 × 58 × 17 mm3 with a cell of 9.2 × 6.5 × 1.8 mm3. The measurements are in good agreement with electromagnetic and circuit co-simulation results.

Place, publisher, year, edition, pages
Institute of Electrical and Electronics Engineers (IEEE), 2023
Keywords
Active integrated phased array antenna, beam steering, direct integration, mm-Wave antenna
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering Telecommunications Communication Systems
Identifiers
urn:nbn:se:kth:diva-338574 (URN)10.1109/TAP.2023.3281075 (DOI)001169294600051 ()2-s2.0-85160708226 (Scopus ID)
Note

QC 20240404

Available from: 2023-11-07 Created: 2023-11-07 Last updated: 2024-05-10Bibliographically approved
Emadeddin, A., Shad, S. & Jonsson, B. L. (2022). High Gain Omnidirectional Array Antenna Using SIW Technology. In: 2022 52Nd European Microwave Conference (EUMC): . Paper presented at 52nd European Microwave Conference (EuMC), SEP 25-30, 2022, Milan, ITALY (pp. 680-683). IEEE
Open this publication in new window or tab >>High Gain Omnidirectional Array Antenna Using SIW Technology
2022 (English)In: 2022 52Nd European Microwave Conference (EUMC), IEEE , 2022, p. 680-683Conference paper, Published paper (Refereed)
Abstract [en]

In this paper, a novel omnidirectional array antenna based on Substrate Integrated Waveguide (SIW) technology is proposed. The proposed antenna is realized by removing some vias on one side of the narrow wall of a conventional SIW which results a slot antenna. The gain of an antenna with 8 slots is 9.5 dBi with a gain variation of 2 dB over 360 degrees. Besides, the antenna polarization is horizontal with the cross-polarization level of less than -40 dB in comparison with the co-polarization level. The bandwidth of 80 MHz at 6.66 GHz is achieved with the antenna's dimension of 300x22.86x1.575 mm(3). The measurement results of the antenna have a good agreement with the full-wave simulation results. The proposed antenna is well suited for 6 GHz wireless access applications due to the low cost, low complexity, simple integration, and high gain.

Place, publisher, year, edition, pages
IEEE, 2022
Series
European Microwave Conference, ISSN 2325-0305
Keywords
Substrate integrated waveguide (SIW), omni-directional, slot array antenna
National Category
Telecommunications
Identifiers
urn:nbn:se:kth:diva-323575 (URN)000895717500171 ()2-s2.0-85142301235 (Scopus ID)
Conference
52nd European Microwave Conference (EuMC), SEP 25-30, 2022, Milan, ITALY
Note

Part of proceedings: ISBN 978-2-8748-7069-9, QC 20230208

Available from: 2023-02-08 Created: 2023-02-08 Last updated: 2024-03-15Bibliographically approved
Jonsson, B. L., Lundgren, J. & Malmstrom, J. (2022). On Spatial Visualization of Mutual Coupling With Applications to Small Embedded Antennas. In: 2022 16TH EUROPEAN CONFERENCE ON ANTENNAS AND PROPAGATION (EUCAP): . Paper presented at 16th European Conference on Antennas and Propagation (EuCAP), MAR 27-APR 01, 2022, Madrid, SPAIN. Institute of Electrical and Electronics Engineers (IEEE)
Open this publication in new window or tab >>On Spatial Visualization of Mutual Coupling With Applications to Small Embedded Antennas
2022 (English)In: 2022 16TH EUROPEAN CONFERENCE ON ANTENNAS AND PROPAGATION (EUCAP), Institute of Electrical and Electronics Engineers (IEEE) , 2022Conference paper, Published paper (Refereed)
Abstract [en]

Mutual coupling between antennas is a key parameter in multi-antenna systems. The present paper describes a method to map contributions to the magnitude of the mutual coupling spatially on surfaces between the ports. The method utilizes the reaction theorem for electromagnetic fields to obtain the contribution of the coupling from different regions. The derived result is valid for and applied to the strong-coupling regime, where the mutual impedance is of the same order as the self-impedance.

Place, publisher, year, edition, pages
Institute of Electrical and Electronics Engineers (IEEE), 2022
Series
Proceedings of the European Conference on Antennas and Propagation, ISSN 2164-3342
Keywords
Reaction theorem, mutual coupling, reciprocity, visualization, antennas
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:kth:diva-316237 (URN)10.23919/EuCAP53622.2022.9769525 (DOI)000815113902100 ()2-s2.0-85130589154 (Scopus ID)
Conference
16th European Conference on Antennas and Propagation (EuCAP), MAR 27-APR 01, 2022, Madrid, SPAIN
Note

Part of proceedings: ISBN 978-88-31299-04-6

QC 20220826

Available from: 2022-08-26 Created: 2022-08-26 Last updated: 2023-03-07Bibliographically approved
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