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The paper describes a shorted patch antenna for dual-band operation. A shorted quarter wavelength patch antenna is used to achieve small dimensions. Two PIN diodes are connected at the non-radiating edges. By reverse and forward biasing of the PIN diodes the antenna resonant frequency is switched from 2 GHz to 4 GHz. The antenna prototype is manufactured and the input impedance as well as the E- and H-plane radiation patterns are measured. The radiation characteristics are good and the radiation pattern shape and cross-polarization levels do not change significantly in a large bandwidth around each of the two resonant frequencies.
antennas ; active antennas ; patch antennas ; dual-band antennas
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