This paper presents a pattern reconfigurable dual-polarized dipole antenna with staggered parasitic elements operating in 3.5 GHz band. The proposed antenna is designed by assembling two linearly polarized antennas to be orthogonally polarized, and each antenna includes two parasitic elements and a single dipole element. A circuit including a varactor is inserted into each parasitic element, and the current phase of the parasitic element changes according to the capacitance of the varactor. Each antenna has a beam steering range of about ± 30 • in the E-plane, and the beamwidth and gain are maintained uniformly regardless of the steering angle due to the angled parasitic element. Also, because of the continuously changing characteristic of the varactor, the beam of the proposed antenna is steered continuously, and only four varactors are used. The size of the fabricated dual-polarized antenna is 1.40λ 0 × 1.40λ 0 × 0.47λ 0 , and the measured results confirm that the antenna has an average gain of around 6 dB with 0.3 dB gain variation.INDEX TERMS Pattern reconfigurable, dual polarization, beam scanning, gain variation, Yagi-Uda antenna.
This paper proposes a wideband circularly polarized antenna with a reconfigurable 2dimensional axial ratio. For mobile satellite communication, the low profile CP antenna with wide axial ratio scanning and a wide frequency bandwidth is essential. In this paper, we propose the wideband CP antenna with an axial ratio controller. The axial ratio deteriorates when the difference between transverse modes (TM)01 and TM10 gets larger. Therefore, in the proposed antenna, the axial ratio controller is used to compensate for the difference by controlling the amplitude and phase of the received signals. The proposed antenna has three mode states for the 2-dimensional axial ratio region. In a simulation of the wideband CP antenna, the axial ratio was below 3 dB in the 2-dimensional scanning region from -60 • to 60 • at every azimuth angle in the 20% factional frequency bandwidth. To verify the proposed antenna with the axial ratio controller, the wideband CP antenna is implemented at 5.8 GHz. A low noise amplifier (LNA) and digital phase shifters are employed for the axial ratio controller. The measured axial ratio was below 3 dB in the 2-dimensional scanning region from -60 • to 60 • at every azimuth angle in the 20% factional frequency bandwidth.INDEX TERMS Wide-angle axial ratio beamwidth, Wide band axial ratio, Amplitude and phase control, 2-dimensional reconfigurable axial ratio
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