Wide-Band, Double-Tuned Microstrip Elements,
ILLINOIS UNIV AT URBANA ELECTROMAGNETICS LAB
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Microstrip antennas are popular because of their inherent versatility as low profile multifunctional antennas. Their few disadvantages, however, include a narrow frequency bandwidth for single-mode operation. This has led to the development of dual-band elements for dual-frequency operation. To achieve a continuous bandwidth of operation from elements displaying an inherently resonant behavior, however, requires two or more resonant modes capable of producing similar radiation patterns with a similar quality factor. In addition, the feed system must be capable of exciting these modes in a manner that produces a smooth transition between modes without intervening stop bands. This paper describes the realization of an element supporting two such modes whose resonant frequencies can be made as close to one another as desired.
- Electrical and Electronic Equipment