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2.4 GHz ISM band antenna for PC cards

We present preliminary investigations into the design of antennas for use in PC cards that communicate in the 2.4 GHz ISM band. Design criteria which are considered desirable for those antenna include, compact size with low profile, low cost, 80 MHz bandwidth with sharp cutoff, vertical null in the antenna pattern, good efficiency, flexible impedance matching to CMOS LNA, circular polarization and possible differential operation. Experimental results from two antenna designs consisting of a PIFA and a dual PIFA configuration are described.