Frequency-Tunable and Pattern Diversity Antennas for Cognitive Radio Applications

الملخص EN

Frequency-tunable microstrip antennas, for cognitive radio applications, are proposed herein.

The approach is based on tuning the operating frequency of a bandpass filter that is incorporated into a wideband antenna.

The integration of an open loop resonator- (OLR-) based adjustable bandpass filter into a wideband antenna to transform it into a tunable filter-antenna is presented.

The same technique is employed to design a cognitive radio pattern diversity tunable filter-antenna.

A good agreement between the simulated and measured results for the fabricated prototypes is obtained.

The radiation characteristics of each designed tunable filter-antenna are included herein.