Circularly-Polarized Stacked Annular-Ring Microstrip Antenna

Abstract

Abstract-In this paper, we propose the aperture feeding as a technique for bandwidth enhancement of multi-band microstrip ring antennas. In particular, we present a dual-band stacked annularring microstrip antenna fed by four bow-tie apertures with circular polarization. Furthermore, we show that the size and shape of the substrate that supports the radiating elements of the antenna plays an important role in the quality of the axial ratio.

Dual Frequency Ring Antennas With Coplanar Capacitive Feed

“…There are several microstrip patch/ring antennas have been reported in literature which operate at dual resonant frequencies [4][5][6][7][8][9][10][11][12][13][14]. However, many of these have relatively complex assembly like stacked configuration [4], suspended configuration (with air gap) [5], modified ground shape [6], dual feed [7] etc., which in some cases is contrary to the fundamental attraction of microstrip antennas.…”

Circular Polarization Fractal Slot by Jerusalem Cross Slot for Wireless Applications

“…Microstrip slot antennas with various shapes are studied for wideband wireless applications for linear and circular polarization and bidirectional pattern [3,4]. During last decades, by the development of the satellite communication, circularly polarized antennas are implemented for communication links to reduce the natural loss effects in receivers [5]. On the other hand, circular polarization (CP) in antennas reduces the loss caused by multipath effects, between the transmitter and receiver antennas.…”

“…The circular polarization (CP) antenna is attractive for portable wireless application such as Radio Frequency Identification (RFID) because of its low profile, small size, and light weight [6]. Receiving orthogonal signals is another benefit of a CP antenna which makes circular polarization important for communication systems [4][5][6].…”