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This letter presents a novel recursive active filter topology that provides dual-band performance, with independent tuning capability in both bands. The dual-band operation is achieved by using two independent feedback lines. Additionally, linear phase shifters based on left-handed cells are included in these two branches in order to tune the center frequency of both pass bands.
A compact system for future communication terminals (Cognitive Radio) is presented in this paper. This system is based on two antennas printed on the same substrate board. The total dimensions of the board are 60 mm × 60 mm, which means that it can be integrated into a handheld terminal. The first antenna is a printed monopole with an omnidirectional radiation pattern which senses the spectrum. The...
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