研究目的
To propose a novel wideband monostatic circularly co-polarized co-channel simultaneously transmit and receive (C-STAR) broadside circular array antenna with a partially shared beam-forming network (BFN) that achieves high TX/RX isolation and similar co-polarized broadside transmitting (TX) and receiving (RX) beams over the same frequency band.
研究成果
A novel wideband, monostatic, circularly co-polarized, non-steering, directional aperture topology for C-STAR is proposed. The configuration utilizes antenna orientation and cancellation in the partially shared BFN to handle the co-channel self-interference. The measurements show TX/RX isolation of >38 dB over an octave of bandwidth. Overall, good quality and similar TX/RX radiation patterns with excellent ECC >0.93 are obtained.
研究不足
The BFN’s components have different responses over the operating bandwidth, resulting in asymmetry between the four mismatches and two internal leakages which causes degradation of TX/RX isolation. The planar configuration is chosen only to prove the proposed concept for the single C-STAR configuration.
1：Experimental Design and Method Selection:
The configuration consists of four sequentially rotated two-arm Archimedean spiral antennas, backed by a finite ground plane and driven by a BFN. Every two diagonal antenna pairs are fed with differential phases to obtain similar co-polarized broadside transmitting (TX) and receiving (RX) beams.
2：Sample Selection and Data Sources:
The array antenna is fabricated on a
3：76 mm-thick Rogers 4350 substrate with εr and tanδ of 66 and 004, respectively and is backed by a 22 cm diameter ground plane. List of Experimental Equipment and Materials:
The BFN consists of three 180° hybrids and one power divider. The spiral element has two-arms with four-turns and 3:1 metal-to-slot ratio.
4：Experimental Procedures and Operational Workflow:
The proposed C-STAR approach utilizes antenna orientation, geometric symmetry, and partially shared BFN to overcome self-interference.
5：Data Analysis Methods:
The simulated S-parameters from ANSYS HFSS are imported into the AWR circuit simulator, where ideal TX/RX C-STAR BFNs are used.
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