Abstract
This paper proposes a duplex dual circularly polarized antenna, using four half-Vivaldi antennas to form a sequential rotation array, which can generate circular polarization by sequential feeding. A mental cavity and half of a Vivaldi antenna form a new Vivaldi antenna. The Vivaldi antenna has broadband characteristics to cover the uplink and downlink bands and is compact with an area of 0.69λc×0.69λc. To achieve duplex dual circular polarization, a feeding network that can sequentially output +90° and −90° is designed. The feeding network, which contains two broadband power dividers, two directional couplers and two phase-shifters, generates the sequential feeding signals for sequential rotation group array with equal amplitude and ±90° phase difference. Both the impedance bandwidth and the 3 dB axial ratio bandwidth of the transmitter and receiver can cover the band of 10–15 GHz. The gain of the antenna is higher than 5.75 dBi. The isolation between the receive and the transmit ports can reach 25.49 dB or higher in the uplink band.
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