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This paper presents the novel design of a printed, low-cost, dual-port, and dual-polarized slot antenna for microwave biomedical radars. The butterfly shape of the radiating element, with orthogonally positioned arms, enables simultaneous radiation of both vertically and horizontally polarized waves. The antenna is intended for full-duplex in-band applications using two mutually isolated antenna ports, with the CPW port on the same side of the substrate as the slot antenna and the microstrip port positioned orthogonally on the other side of the substrate. Those two ports can be used as transmit and receive ports in a radar transceiver, with a port isolation of 25 dB. Thanks to the bow-tie shape of the slots and an additional coupling region between the butterfly arms, there is more flexibility in simultaneous optimization of the resonant frequency and input impedance at both ports, avoiding the need for a complicated matching network that introduces the attenuation and increases antenna dimensions. The advantage of this design is demonstrated through the modeling of an eight-element dual-port linear array with an extremely simple feed network for high-gain biosensing applications. To validate the simulation results, prototypes of the proposed antenna were fabricated and tested. The measured operating band of the antennas spans from 2.35 GHz to 2.55 GHz, with reflection coefficients of less than—10 dB, a maximum gain of 8.5 dBi, and a front-to-back gain ratio that is greater than 15 dB, which is comparable with other published single dual-port slot antennas. This is the simplest proposed dual-port, dual-polarization antenna that enables straightforward scaling to other frequency bands.
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Modeling and Design of Aperture Coupled Microstrip Patch Antennas with Dual-Offset Feedline
This paper describes a methodology for designing feed networks for single-polarized aperture-coupled microstrip patch (ACMP) antennas with dual-offset microstrip feedlines. The method involves characterizing the effective series impedance of the antenna when it is fed in a balanced manner as a function of the distance between the dual feedlines. Fitting equations were generated from the data to relate the effective series impedance to the feed geometry, allowing the design of the matching network for any effective impedance. This work demonstrates that ACMP antennas can be coupled to dual-offset feedlines with λ/4 transformers and T-junctions with infinite combinations of impedance for the λ/4 transformer. A 10 GHz single-polarized ACMP antenna was designed and implemented obtaining satisfactory impedance matching.
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- Award ID(s):
- 2132229
- PAR ID:
- 10561038
- Publisher / Repository:
- IEEE
- Date Published:
- ISBN:
- 979-8-3503-6990-8
- Page Range / eLocation ID:
- 753 to 754
- Format(s):
- Medium: X
- Location:
- Firenze, Italy
- Sponsoring Org:
- National Science Foundation
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- Free Publicly Accessible Full Text
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Accepted Manuscript1.0
- Conference Paper:
- https://doi.org/10.1109/AP-S/INC-USNC-URSI52054.2024.10685925
