Compact Circularly Polarized Enhanced Gain Microstrip Antenna on High Permittivity Substrate

A microstrip‐fed cavity‐backed circularly polarized horn antenna

“…But their uses are limited by structural complexity that feeder and polarizer are separated [1], or limited to linear polarization [2]. Other approaches using microstrip feeding methods such as microstrip-fed cavity-backed slot antenna [3] and microstrip-fed horn antennas [4,5] have been reported. The former one obtained a radiation gain of 8.7 dBi at 6 GHz for four-element subarray, while the latter obtained 5.5 dBi without horn and 9 dBi with horn at 5.8 GHz for a single radiator.…”

“…The former one obtained a radiation gain of 8.7 dBi at 6 GHz for four-element subarray, while the latter obtained 5.5 dBi without horn and 9 dBi with horn at 5.8 GHz for a single radiator. Nasimuddin [5] tried to reduce planar size using high permittivity substrate. However, this paper proposes a combined method of the microstrip feeding and caivity-backed horn radiation to reduce the size and to obtain optimized antenna performances.…”

“…Besides, the CPW-fed slot antenna can also have relatively much wider impedance bandwidth than the conventional microstrip antenna [5,6]. They have enough bandwidth to support modern wireless communication.…”

Dual-Band Circularly-Polarized Monopulse Antenna System With Single Layer Patches and Separated Feed Networks

“…Nevertheless, the design of an antenna with circular polarization is a classic topic and the improvement is still a frequent subject. For example, one technique is the employment of multilayer substrate with different structures on each layer [11][12][13][14]. The axial ratio (AR) bandwidth (BW) of multilayer structures can be improved if the layers are separated with air or foam layer, and one or more probes are used between the layers [15,16].…”

A technique to reduce the cross-polarization levels of a microstrip patch fed horn antenna

“…Most conventional microstrip antennas have low gain, in the order of 5 -8 dBi. Several methods have previously been investigated to improve the gain of simple patch antenna, including using a stacked parasitic structure [1], a cavity backed architecture [2], and the addition of a quasi-planar surface mounted short horn [3,4]. One simple and inexpensive method to increase the gain of a patch antenna is to attach it to a rigid horn structure.…”