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Design, simulation, and measurement of a compact flltering microstrip antenna is presented. A feed line, two hairpin resonators, and a rectangular patch are integrated to form the flltering antenna. The elements together function as a third order bandpass fllter with Chebyshev equal ripple response of 0.043dB at midband frequency of 2.0GHz. The rectangular patch acts not only as a radiating element, but also as the last resonator of the bandpass fllter. The proposed flltering antenna exhibits good out-of- band gain suppression, ∞at in-band gain response, good selectivity at the band edges, and well-shaped radiation pattern.

DESIGN OF FILTERING MICROSTRIP ANTENNA USING FILTER SYNTHESIS APPROACH