Wideband Cylindrical Dielectric Resonator Antenna Operating in HEM_11δ Mode with Improved Gain: A Study of Superstrate and Reflector Plane

Abstract

A wideband and high gain dielectric resonator antenna (DRA) operating in hybrid HEM 11 mode is proposed. The investigated geometry employs one cylindrical dielectric resonator partially covered with a transparent dielectric superstrate and backed up by a single side metal coated dielectric reflector plane. The reflector is dedicated for gain enhancement while the superstrate is employed for merging of two resonant bands resulting in a single wide band. The dielectric resonator is excited by simple microstrip feed slot coupling technique and operates over X-band, ranging from 7.12 GHz to 8.29 GHz, that is, of 15.18% impedance matching bandwidth with 11.34 dBi peak gain. The different development stages like standalone DRA, DRA with superstrate, DRA with reflector, and DRA with both superstrate and reflector plane with respect to bandwidth and gain performances are analyzed properly. To the best of authors' knowledge, this is the first time this type of combination of both superstrate and reflector plane is demonstrated in DRA engineering. An antenna prototype was fabricated and characterized and a very good agreement is achieved between the simulated and measured results.

A rectangular slot antenna with perfectly conducting superstrate and reflector sheets for superior radiation in the 6–9 GHz band

“…Mismatches between the measured and the simulated results are attributed to the errors in the antenna fabrication and the measurement. In Table 6, the performance of the proposed antenna design is compared with that of existing superstrate and/or reflector loaded structures with center frequency in the 6-9 GHz band [22,[24][25][26]. The proposed antenna has the following advantages over other designs: (i) smaller volume, simpler design and construction as compared to [24,25], (ii) gain comparable to [22,26], (iii) higher impedance bandwidth than any other design, and (iv) wider radiation bandwidth than any other design (considering the fact that the radiation bandwidth of the proposed design is much larger than the impedance bandwidth of any other design).…”

“…Even though fully reflecting elements such as conducting sheets are popularly used as reflectors for directivity (front-to-back ratio (FBR)) enhancement [4,21,22], the same with the slightly different design are also employed as superstrates [23][24][25][26]. In [23,24], a conducting superstrate of side ∼λ 0 is placed at ∼λ 0 /2 distance from the ground plane of the primary antenna to form a resonant cavity antenna.…”

Slot-DRA-Based Independent Dual-Band Hybrid Antenna for Wearable Biomedical Devices

“…We see that the SAR value in the second case is relatively lower than the first case. The reason behind the lower SAR value in the second case is attributed to the extra electronic packaging PCB board below the antenna, which acts as a quasi-reflector and reduces backward radiation [33]. In the first case, the peak 10-g SAR values of 4.9 and 4.1 W/kg was observed for an input power of 1 W at 2.4 and 5.8 GHz, respectively.…”

Conceptual design approach of wideband fractal dielectric resonator antenna

“…It is due to fact that the effective aperture of the antenna increases with respect to wavelength [20]. The use of superstrate is one of the ways to enhance the value of gain in the operating region [21]. The value of efficiency in the complete working frequency range is about 90%, which is quite good.…”