Compact High Gain Resonant Cavity Antenna With via Hole Feed Patch and Hybrid Parasitic Ring Superstrate

Abstract

A compact and high gain resonant cavity antenna (RCA) is investigated in this work. At first, a ray-tracing model and the full-wave analysis are presented to clarify the characteristics of RCA in cases of finite lateral size and inhomogeneous superstrate. In consequence, a novel compact, high gain, and wideband RCA is proposed. The RCA consists of a via hole feed patch and an array of hybrid parasitic rings fabricated on a superstrate. The via holes feed patch with a high radiation directivity significantly enhances the RCA's gain. On another hand, the dimension and bandwidth of the RCA are improved by the hybrid parasitic ring superstrate which is constituted by non-periodic parasitic patch and rings. Finally, a prototype of the RCA is fabricated and measured. With only the dimension of 1.35λ 0 × 1.35λ 0 × 0.63λ 0 , the peak gain of 15.8 dBi and 3 dB gain bandwidth of 10.7% are obtained. INDEX TERMS Resonant cavity antenna, compact, high gain, non-periodic microstrip superstrate, hybrid parasitic ring.

A Novel Compact Rectangular Microstrip Patch Antenna with a Superstrate Element for 2.4GHz WLAN Applications

“…The antenna gain of 10.8 dB is attained. Again, in [8], An FR4 di-electric superstrate is placed on top of a compact micro-strip antenna resulting in a gain of 15.8 dB at 5.8 GHz.…”

High Gain Antenna Miniaturization With Parasitic Lens

“…The multi-function of proposed superstrate leads to the need of a non-periodic microstrip structure. For the RCA, the hybrid-parasitic superstrate has been introduced with high gain and compact size [28]. This structure is also much simpler than others such as frequency selective surface or metamaterial that is valid to reduce cost and design time.…”

“…The parasitic elements are etched on both sides of the superstrate with one rectangular ring on the bottom and 7 hybrid elements on top. The categorization of elements (E0, E1, E2, and E3) and the arrangement of the hybrid structure are inherited the RCA as in [28], but the configuration is different. Both source and superstrate use the same substrate of Taconic TLY with the dielectric constant of 2.2 and the thickness of 1.2 mm (0.02λ 0 ).…”

“…Resonant cavity and lens structures are two common types of high gain spatially distributed antenna which all use the superstrate to enhance the directivity of an excited source. In the case of resonant cavity antenna (RCA), the superstrate is configured as a partially reflecting surface [23]- [28] while the ground of the feed source is a perfectly reflecting surface. The gain enhancement is proportional to the reflection between two reflecting surfaces.…”

“…Consequently, the dimension of the sourced antenna must be as large as the superstrate, which prevents it from many applications. Compact and high gain structures have been proposed but not enough for miniatured applications [28]. On another hand, the lens antenna installs the superstrate as a high focusing lens in front of a small antenna element as a focal point [29]- [31].…”