A single feed dual-band stacked patch planar inverted-F antenna (PIFA) is integrated with an RF switch array at one side of its shorting straps to make a tunable PIFA. The L-band switch yields 0.45 dB insertion loss (IL) and 10 dB isolation bandwidth (BW) of >100% at 1.2 GHz. The tunable PIFA yields >100% frequency tunability BW at the 800 MHz band and /spl sim/5% BW at the 1.9 GHz band. The measured radiation patterns are nearly omni-directional and yield a gain of 2.2 dBi at 800 MHz and 4.5 dBi at 1.9 GHz.
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Nemai Chandra Karmakar (2003) studied this question.