New Approach in Designing Resonance Cavity High-Gain Antenna Using Nontransparent Conducting Sheet as the Superstrate

Abstract

A resonance cavity antenna (RCA) has been explored employing nontransparent solid metal sheet as superstrate which, to the best of our knowledge, is reported for the first time. The proposed configuration is much advantageous in terms of design, simplicity, structural stability, fabrication, and cost without compromising in gain, efficiency, and bandwidth. A probe-fed dielectric resonator antenna (DRA) with ε r =10 has been used as the primary radiator. Proposed RCA bearing overall size 1.1λ×1.1λ×0.6λ promises for large impedance bandwidth (23%) with considerably high gain (11.8 to 12.2 dBi). The superstrate size is relatively compact compared to its semi-transparent versions, investigated earlier. Present design has been experimentally validated indicating as much as 12 dBi peak gain with more than 96.5% efficiency.

Wideband Cylindrical Dielectric Resonator Antenna Operating in HEM11δ Mode with Improved Gain: A Study of Superstrate and Reflector Plane

“…Generally superstrate improves the gain and radiation characteristics without affecting the standard of operation of DRA [14]. So in view of this, the authors started analyzing the performance of the antenna by introducing a transparent dielectric superstrate.…”

“…It can be concluded that the field trapped in between the cylindrical DR and the dielectric superstrate causes a wide impedance band by shifting the first resonance above (Figure 7). This superstrate based DRA is considered as Antenna #2 and its outcomes can be summarized as (i) improvement of 22.67% peak gain, that is, up to 6.6 dBi, (ii) formation of single wide band by merging two resonant bands, (iii) being operated in the same HEM 11 mode, and (iv) introduction of light weight, simple, and compact dielectric superstrate in comparison to [14]. Though this antenna deals with quite improved performance compared to Antenna #1, further performance enhancement study is presented in next subsection.…”

“…According to Guha et al in [13], the exploration of higher order mode (HEM 12 ) also gives high gain of 8.5 dBi. Further, the use of superstrate with DRA has been deeply analyzed by research groups led by Coulibaly et al [7], Dutta et al [14], and Dong et al [15]. Briefly, the use of periodic frequency selective surfaces (FSS) on superstrate has enhanced the gain up to 11 dBi [7], while the use of loaded patches has been used to enhance the gain up to 12.2 dBi and 7.54 dBi in [14] and [15], respectively, without affecting the mode of operation.…”

“…Further, the use of superstrate with DRA has been deeply analyzed by research groups led by Coulibaly et al [7], Dutta et al [14], and Dong et al [15]. Briefly, the use of periodic frequency selective surfaces (FSS) on superstrate has enhanced the gain up to 11 dBi [7], while the use of loaded patches has been used to enhance the gain up to 12.2 dBi and 7.54 dBi in [14] and [15], respectively, without affecting the mode of operation. Ali et al [16][17][18] and Nikkhah et al [19] have proposed the concept of reflector to improve the directivity and gain by means of reducing the back radiation which are quite valuable for researchers.…”

Wideband high gain conical dielectric resonator antenna: An experimental study of superstrate and reflector

“…However, from above techniques, the superstrate and reflector techniques are quite adept, as they have the potential to improve the radiation characteristics without much affecting DR/substrate geometry and other performances. But the investigations on these techniques are quite limited, which need to be extended further.…”