Abstract
This paper presents a wideband quad-polarization-reconfigurable bidirectional antenna using a simple wideband switchable feeding network. By cutting a symmetrical fractal slot on the ground, a wideband dual-polarized differential bidirectional circular monopole antenna with high isolation is realized. To achieve reconfigurable quad-polarization diversity, the bidirectional circular monopole antenna is fed by a wideband switchable feeding network, which provides four output states by only using six PIN diodes. For verification, a prototype operating at 1.85 GHz is designed and fabricated. For the two linear polarization (LP) states, the measured 10-dB bandwidths are 28.4% and 25.3%, while the measured peak gains are 4.2 dBi and 3.1 dBi, respectively. For the two circular polarization (CP) states, the measured bandwidths with 10-dB return loss and 3-dB axial ratio (AR) are 26.3% and 17.4%, respectively. The measured peak gains are 2.8 dBi and 2.4 dBi, respectively.
Published Version
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