Gain augmentation of a dual‐band dielectric resonator antenna with frequency selective surface superstrate

Abstract

Gain augmentation of a dual‐band antenna with different bandwidths using superstrate is presented in this paper. Initially, the dual‐band radiator is designed using a rectangular dielectric resonator (DR). The fundamental mode TE111 of the rectangular DR resonates at 3 GHz over a narrowband (BW = 5.08%). The upper wideband (BW = 20% with center frequency 5.86 GHz) is obtained by the amalgamation of two hybrid modes with higher‐order TE113 mode. The dielectric waveguide model is used for the theoretical analysis of two radiating modes of the rectangular DR. Further, a dual‐band frequency selective surface with bandpass response is designed and loaded as a superstrate above the DR antenna for gain improvement in both the bands, which leads to a gain augmentation of 1.8 dBi and upto 3.5 dBi in the lower and upper band respectively. At last, the proposed design is implemented practically, and measurement results are portrayed to compare with simulation results that agree reasonably well.

Conducting sheets‐loaded slot antenna for high gain and wide 3 dB gain‐band operation

“…The technique of superstrate loading has been widely used to improve the gain of patch antennas, 9,10 dielectric resonator antennas, 11–14 and directional slot antennas 15–19 . Superstrate loaded antennas, also known as the resonant cavity antennas produce high gain through multiple reflections between itself and the ground plane through the Fabry‐Perot cavity effect 17,20,21 .…”

“…3,4 The wider bandwidth feature of slot antennas has given rise to several wideband and ultra-wideband antenna designs using simple techniques such as offset fed slot, 2,4,5 wide slot fed with fork-like microstrip, 5-7 and stub loaded slot. 8 The technique of superstrate loading has been widely used to improve the gain of patch antennas, 9,10 dielectric resonator antennas, [11][12][13][14] and directional slot antennas. [15][16][17][18][19] Superstrate loaded antennas, also known as the resonant cavity antennas produce high gain through multiple reflections between itself and the ground plane through the Fabry-Perot cavity effect.…”

“…17,20,21 The cavity if properly designed also enhances the antenna bandwidth. 11,15 Frequency selective surfaces, 14,19,20 dielectric sheets, 10,13,22 electronic band gap structures, 23,24 metamaterials, 25,26 and fully conducting sheets 11,15,16,18 have been proposed as superstrates offering various performance advantages.…”

Synthesizing Radiation Properties of Dual-band Dual-mode High Gain Dielectric Resonator Antenna for Wireless Applications

“…This method is not suitable for all applications due to the limitation of the compact installation platform. Therefore to solve these issues, varieties of gain enhancement techniques, such as the use of electromagnetic bandgap (EBG) structure [17], metallic cap [18], different feeding mechanisms [19], stacked configured of different layers [20], frequency selective surfaces (FSS) [21], and superstrate layer [22][23][24][25][26], are developed by researchers. In most of the reported articles, it is observed that the gain enhancement at the lower frequencies by maintaining the miniaturized dimension becomes a challenging task.…”

High Gain and Wideband Multi-Stack Multilayer Anisotropic Dielectric Antenna

“…Nowadays, many researchers are interested in Dielectric Resonator Antennas (DRAs). This theme was introduced in 1983 [1], and they have been widely studied and used owing to their attractive properties like small size, low ohmic loss, light weight, ease of excitation, wide bandwidth, and very high radiation efficiency in compared with planner antenna [2][3][4][5][6]. They are used in both linearly and circularly polarized systems [7][8][9][10][11].…”