This paper reports a bi-port, wideband, parasitic-fed, single/shared patch antenna with enhanced interport isolation for 2.4 GHz in-band full duplex (IBFD) applications. The employed parasitic feeding provides comparatively the wider impedance bandwidth and better gain for the presented antenna. The improved self-interference cancellation (SIC) levels across the required bandwidth are obtained through differentially-driven receive (Rx) mode operation. The differential Rx operation performs effective cancellation of in-band self-interference (SI) through signal inversion mechanism to achieve the additional isolation on the top of the intrinsic isolation of polarization diversity. The validation model for the presented antenna features ≥88 dB peak isolation between the dual-polarized Tx and Rx ports. In addition, the measured Tx–Rx isolation for prototype is >70 dB across the 10 dB return loss bandwidth of 100 MHz (2.42–2.52 GHz). The measured gain for each mode is better than 7.0 dBi. The novelty of this work is that compared to previously reported designs, the presented antenna offers wider impedance bandwidth and improved SIC levels in addition to superior gain performance. To the best of our knowledge, this is the first single/shared patch antenna which provides better than 70 dB interport isolation across the 10 dB return loss bandwidth of 100 MHz along with 7.0 dBi gain for Tx/Rx modes.

本文报告了一种双端口、宽带、寄生馈电、单/共享贴片天线，具有增强的端口间隔离，适用于 2.4 GHz 带内全双工 (IBFD) 应用。所采用的寄生馈电为所提出的天线提供了相对更宽的阻抗带宽和更好的增益。通过差分驱动接收 (R x ) 模式操作，可在所需带宽内提高自干扰消除 (SIC) 水平。差分R x操作通过信号反转机制有效地消除带内自干扰（SI），从而在极化分集的固有隔离之上实现额外的隔离。所提出天线的验证模型在双极化 T 之间具有 ≥88 dB 峰值隔离x和 R x端口。此外，在100 MHz (2.42–2.52 GHz) 的 10 dB 回波损耗带宽内，测得的原型T x –R x隔离度 > 70 dB。每种模式的测量增益优于 7.0 dBi。这项工作的新颖之处在于，与先前报道的设计相比，所提出的天线除了具有出色的增益性能外，还提供更宽的阻抗带宽和更高的 SIC 水平。据我们所知，这是第一款单/共享贴片天线，它在 100 MHz 的 10 dB 回波损耗带宽上提供优于 70 dB 的端口间隔离，同时 T x /R x模式的增益为 7.0 dBi。