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This paper proposes a full-duplex (FD) antenna design with passive self-interference (SI) suppression for the 28 GHz mmWave band. The reduction in SI is achieved through the design of a novel configuration of stacked Electromagnetic Band Gap structures (EBGs), which create a high impedance path to travelling electromagnetic waves between the transmit and receive antenna elements. The EBG is composed of stacked patches on layers 1 and 2 of a four-layer stack-up configuration. We present the design, optimization, and prototyping of unit antenna elements, stacked EBGs, and integration of stacked EBGs with antenna elements. We also evaluate the design through both HFSS (High Frequency Structure Simulator) and over-the-air measurements in an anechoic chamber. Through extensive evaluations, we show that (i) compared to an architecture that does not use EBGs, the proposed novel stacked EBG design provides an average of 25 dB of additional reduction in SI over 1 GHz of bandwidth, (ii) unit antenna element has over 1 GHz of bandwidth at −10 dB return loss, and (iii) HFSS simulations show close correlation with actual measurement results; however, measured results could still be several dB lower or higher than predicted simulation results. For example, the gap between simulated and measured antenna gains is less than 1 dB for 26–28 GHz and 28.5–30 GHz frequencies, but almost 3 dB for 28–28.5 GHz frequency band.
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A High Gain Flexible Antenna for Full Duplex System at 5.8 GHz with Defected Ground Structure
A novel high gain full duplex flexible antenna using PET paper and foam is presented for 5.8 GHz. Two rectangular patches are placed on top layer whereas bottom layer has defected ground structure printed on it. Patches are fed with inset line feeding. This antenna works effectively from 5.75GHz to 5.81 GHz for full duplex purpose while maintaining a radiation efficiency of 98.6% and peak gain of 8.78 dB at 5.8 GHz. This antenna is believed to be first proposed antenna which is flexible and full duplex with such high gain while working at 5.8 GHz. It also has simple structure, low cost, light weight along with good isolation and gain, which eventually makes it a good candidate for 5.8 GHz full duplex applications.
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- Award ID(s):
- 2104513
- PAR ID:
- 10462306
- Date Published:
- Journal Name:
- 2022 IEEE International Symposium on Antennas and Propagation and USNC-URSI Radio Science Meeting (AP-S/URSI)
- Page Range / eLocation ID:
- 1040 to 1041
- Format(s):
- Medium: X
- 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/USNC-URSI47032.2022.9886246
