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A circularly polarized antenna with square patches and slots has been proposed for radio frequency identification reader applications. The design of reader antenna is optimized to reduce the overall size of an antenna. A ground plane with an arrow type slot has been utilized for efficient coupling of RF power from the feed line to the antenna's square patches. On the square patches, square slots have...
A star patch antenna with four feeding points is proposed for generation of four tilted beam patterns in four different space quadrants. Hence, when these feeding points are excited one by one the whole space in front of antenna can be scanned. For the same physical dimensions in comparison to a star strip antenna, the star patch antenna has a 30 percent lower resonating frequency. The gain and AR...
This paper covers five different types of single element beam scanning antennas under electronic switch control. Firstly, a rectangular spiral antenna with shorting and open switches is presented. Following that, its polarization and other antenna parameter limitations are addressed. Then new structures, namely: star strip, star patch and square loop antennas, introduced to overcome the polarization...
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