Abstract
This article presents a dual polarized, proximity-fed monostatic patch antenna (single radiator for both transmit and receive modes) with improved interport isolation for 2.4 GHz in-band full duplex (IBFD) applications. The proximity-fed radiating patch offers comparatively wider impedance bandwidth for presented design. Very nice self-interference cancelation (SIC) levels for intended impedance bandwidth have been achieved through differential receive (Rx) mode configuration. The differential Rx mode based on 180° ring hybrid coupler acts as a signal inversion mechanism for effective suppression or cancelation of in-band self-interference (SI) that is, the leakage from transmit port. The implemented prototype of proposed antenna achieves ≥87 dB peak isolation for dual polarized IBFD operation. Moreover, the recorded interport isolation for validation model ≥60 dB within 10 dB-return loss bandwidth of 90 MHz (2.36-2.45 GHz). The measured radiation characteristics of implemented antenna demonstrate nice gain and low cross-polarization levels for both transmit (Tx) and receive (Rx) modes. The dimensions of implemented antenna are 70 × 75 × 4.8 mm3. The novelty of this work is wide-band SIC performance for monostatic antenna configuration with compact structure of presented design.
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