Abstract-Design, simulation, and measurement of a compact filtering microstrip antenna is presented. A feed line, two hairpin resonators, and a rectangular patch are integrated to form the filtering antenna. The elements together function as a third order bandpass filter with Chebyshev equal ripple response of 0.043 dB at midband frequency of 2.0 GHz. The rectangular patch acts not only as a radiating element, but also as the last resonator of the bandpass filter. The proposed filtering antenna exhibits good out-ofband gain suppression, flat in-band gain response, good selectivity at the band edges, and well-shaped radiation pattern.
A switchable microstrip patch antenna for multifrequency operation is presented. The antenna is fed by coplanar waveguide via capacitive coupling slot. The antenna allows an easy reconfigurability of the frequency band of operation by incorporating switches in the coupling slot. The resonant frequency of the antenna can be adjusted by setting the switches on or off. The antenna is capable of switching between 1.6, 1.8, 2.0 and 2.4 GHz. Measurements show that the realized gain is 5.2, 4.4 and 4.9 dB for the 1.6, 2.0 and 2.4 GHz frequency bands respectively. Both simulation and measurement results indicate that the proposed antennas demonstrate very good impedance matching, stable radiation patterns and reasonable gain at all frequency bands.
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