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This letter proposes a reconfigurable microstrip patch antenna with polarization states being switched among linear polarization (LP), left-hand (LH) and right-hand (RH) circular polarizations (CP). The CP waves are excited by two perturbation elements of loop slots in the ground plane. A p-i-n diode is placed on every slot to alter the current direction, which determines the polarization state. The...
A novel circularly polarized microstrip antenna fed by coupled microstrip lines is presented. The antenna is printed on a single layer substrate. Circular polarized wave is excited by a pair of side-concaved square patches. A balun from coupled microstrip lines to microstrip line is designed to measure the antenna's performances. The experiment results show that the maximum gain is 9.71dB and the...
A novel compact reconfigurable microstrip antenna with agile polarization is proposed. Two small orthogonal notches near opposite angles of the square patch are cut. A PIN diode is placed on every notch and is used as switch to change the current distribution. By controlling two switches, the antenna can operate on left-hand, right-hand and linear polarizations. This antenna is designed, fabricated...
The circularly polarized antennas fed by aperture coupling, which are applied in rectennas, have been researched. The double-layer structures, which put the feed networks and the radiating patches in the different sides, provide several good performances. First, it minimizes the influence of feedlines on the patches. Then, the gain and bandwidth can be improved in some degrees and it is easy to be...
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