In order to obtain antennas with adjustable bandwidth, arrays based on ring antenna are used, especially for the case when it is necessary to reduce it. The arrays are formed with an inner patch designed at the operation frequency of the system, and a gap coupled external ring, designed at other near lower frequency, which determines the bandwidth increment or decrement, respectively. Three basic ring geometries were considered: circular, rectangular and pentagonal, with RT/Duroid 5880 as a substrate. The feed point is located in the inner patch, in the external ring, a shorting pin is used. The changes achieved on the bandwidth are small, but considering the used principle it remains a useful approximation, that can be improved. There were obtained a maximum increasing of 53% and a maximum decreasing of 51.44%, compared to the bandwidth of the inner patch antenna, designed at 4.9 GHz and simulated as a single antenna.
Three Basic Geometries of Rings Containing Microstrip Antennas
01.11.2012
465788 byte
Aufsatz (Konferenz)
Elektronische Ressource
Englisch
Microstrip antennas for GPS applications
IEEE | 2002
|Planar Microstrip Yagi Antennas
NTRS | 1990
|Square-Spiral Microstrip Antennas
Online Contents | 1994
Square-Spiral Microstrip Antennas
NTRS | 1994
|Robust High-Temperature Microstrip Antennas
Online Contents | 1997