This paper investigates annular or circular ring microstrip patch antennas and the fundamental terms related to design aspects and study of antenna. Like many variations of microstrip patches, circular ring has received considerable attention due to its broadband nature and smaller circular counterparts. In this paper mathematical analysis of annular ring patch antenna with design is presented and studied. The demand of circularly polarized annular ring patch antennas (ARMSAs) has increased drastically in multi-band systems, satellite communication, and mobile communication applications and also in medical applications. Here the researches on this antenna are summarized and analyzed from literature.
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