Abstract
A novel compact dual-band circular/linear polarization (CP/LP) switchable slot annular antenna with integrated filtering network is proposed in this paper. The feed network is composed of a couple of stepped impedance resonators (SIR) with favorable dual-band filtering characteristic. The SIR structure loaded with T-shape branches can adjust the center frequency more flexibly especially for dual band operating. A PIN diode is welded on the slot antenna to achieve the transform between the linear polarization and the circular polarization of the filtering antenna. The proposed dual-band CP antenna easily achieves 10 dB impedance bandwidth of 140/180 MHz and 3-dB axial-ratio bandwidth approximating 230/210 MHz at 2.6/4.8 GHz.
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