Abstract
A new dual-polarized antenna and array are presented for In-Band Full-Duplex (IBFD) applications, offering high inter-port isolation. The single-element antenna system consists of four H-shape slots, stacked patches for wide bandwidth, and two external hybrid couplers. The multilayer antenna is well matched from about 2.1 to 2.4 GHz and provides high isolation in this frequency range in excess of 60 dB. Two different prototypes are simulated and measured to highlight the design process. In addition, a new and compact hybrid coupler with excellent phase and magnitude stability is also presented for improved antenna radiation and IBFD performances. When compared to other similar types of hybrid coupler and antenna systems, the proposed configurations are simple to manufacture, provide a higher isolation bandwidth (10%), and higher gain of 7.3 dBi with cross-polarization levels of 30 dB or lower. The single-element design was also extended to a 2×2 array and studied for different beam steering and feeding scenarios. The operating bandwidths and isolation values offered by these S-band antenna and array systems can support new data link possibilities for beam steering and future low-cost IBFD wireless networks by simple antenna fabrication.
Highlights
W ITH the advancements of wireless communications, full-duplex (FD) antenna systems are once again a topic of interest [1]
The developed cancellation circuit on the receiver side, integrated on a separate board, compensated the phase instabilities of the cables and the hybrid coupler. This improved the isolation beyond 50 dB. Following these developments we propose a new and lowcost antenna and array offering high inter-port isolation which can be useful for future wireless networks and RF-In-Band Full-Duplex (IBFD) systems
In this paper a new IBFD dual-polarized antenna element and 2×2 array were presented for S-band applications
Summary
W ITH the advancements of wireless communications, full-duplex (FD) antenna systems are once again a topic of interest [1]. The inclusion of a slot-based coupler would reduce the phase imbalances introduced to the antenna by the feeding network To improve these results, a slot-based coupler was designed using transmission line meandering for compactness (see Fig. 11). These results demonstrate a clear advantage when using the slot-line couplers in terms of enabling no beam squint over frequency and generally providing lower cross-polarization levels as well as sustained isolation for the practical antenna
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