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Dual-Band Shared-Aperture Single-Layer Partially Reflective Surface Antenna With Flexible Frequency Ratio

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Bibliographic Details
Title: Dual-Band Shared-Aperture Single-Layer Partially Reflective Surface Antenna With Flexible Frequency Ratio
Authors: Lau, Buon Kiong
Contributors: Lund University, Profile areas and other strong research environments, Strategic research areas (SRA), ELLIIT: the Linköping-Lund initiative on IT and mobile communication, Lunds universitet, Profilområden och andra starka forskningsmiljöer, Strategiska forskningsområden (SFO), ELLIIT: the Linköping-Lund initiative on IT and mobile communication, Originator, Lund University, Faculty of Engineering, LTH, LTH Profile areas, LTH Profile Area: AI and Digitalization, Lunds universitet, Lunds Tekniska Högskola, LTH profilområden, LTH profilområde: AI och digitalisering, Originator
Source: IEEE Open Journal of Antennas and Propagation. 6(4):1049-1060
Subject Terms: Engineering and Technology, Electrical Engineering, Electronic Engineering, Information Engineering, Telecommunications, Teknik, Elektroteknik och elektronik, Telekommunikation
Description: Dual-band shared-aperture Fabry-Pérot cavity (DS-FPC) antennas with single-layer partially reflective surface (PRS) are inherently limited in the achievable frequency ratio. This paper analyzes such antennas to derive the feasible range of frequency ratio and thereafter proposes a dual-band shared-aperture antenna that can fill the frequency ratio gap. The novel design integrates a short backfire antenna for the low band (LB) and a Fabry-Pérot cavity (FPC) antenna for the high band (HB), utilizing a shared single-layer PRS and a parasitic element. To demonstrate the effectiveness of the solution, a prototype was designed and fabricated for the frequency ratio of 1.64, representing the extreme limit of the infeasible frequency ratio gap for conventional DS-FPC antennas with single-layer PRS. The overall height of the antenna is 0.36 and 0.59 wavelength in LB and HB, respectively. The prototype achieves 7.3% and 6.7% of measured overlapping 10dB impedance bandwidth and 3dB realized gain bandwidth, significantlyoutperforming other designs with single-layer PRS. Moreover, it generally offers simpler structure, lower profile, as well as more balanced overlapping bandwidths when compared to other designs with multi-layer PRS.
Access URL: https://doi.org/10.1109/OJAP.2025.3560577
Database: SwePub
Description
Abstract:Dual-band shared-aperture Fabry-Pérot cavity (DS-FPC) antennas with single-layer partially reflective surface (PRS) are inherently limited in the achievable frequency ratio. This paper analyzes such antennas to derive the feasible range of frequency ratio and thereafter proposes a dual-band shared-aperture antenna that can fill the frequency ratio gap. The novel design integrates a short backfire antenna for the low band (LB) and a Fabry-Pérot cavity (FPC) antenna for the high band (HB), utilizing a shared single-layer PRS and a parasitic element. To demonstrate the effectiveness of the solution, a prototype was designed and fabricated for the frequency ratio of 1.64, representing the extreme limit of the infeasible frequency ratio gap for conventional DS-FPC antennas with single-layer PRS. The overall height of the antenna is 0.36 and 0.59 wavelength in LB and HB, respectively. The prototype achieves 7.3% and 6.7% of measured overlapping 10dB impedance bandwidth and 3dB realized gain bandwidth, significantlyoutperforming other designs with single-layer PRS. Moreover, it generally offers simpler structure, lower profile, as well as more balanced overlapping bandwidths when compared to other designs with multi-layer PRS.
ISSN:26376431
DOI:10.1109/OJAP.2025.3560577