Effects of an ordinary adhesive material on radiation characteristics of a dielectric resonator antenna

Abstract

This article reports the impact of using an ordinary adhesive material to bond a dielectric resonator antenna (DRA) to the ground plane to predict the potential variations in resonant frequency and impedance bandwidth of DRA. A set of aperture fed and monopole fed cylindrical DRAs have been analyzed at resonant frequencies of 2.4 and 8.9 GHz. For DRAs resonating at 2.4 GHz, an upward resonance frequency shift of 6.2% along with increase of 1.4 to 2% in impedance bandwidth have been observed. However, a significant shift of 12% in the resonant frequency and 17–20% increase in impedance bandwidth have been observed for DRAs operating at 8.9 GHz. End‐fire TM01 mode has been excited in the DRAs, and it has been observed that the adhesive material has not affected the operating resonant mode. © 2014 Wiley Periodicals, Inc. Microwave Opt Technol Lett 56:1502–1506, 2014

Rectangular Dielectric Resonator Antenna With Corrugated Walls

“…So that, observe in Fig. 7 that, by considering the air gap thickness of To fix the dielectric layers onto each other and also the bottom layer on the ground plane, a commercially available adhesive material with the permittivity of 2.2 − j0.022 is used [33]. As shown in Fig.…”

Quad‐port ring dielectric resonator based MIMO radiator with polarization and space diversity

“…Slight difference is presented in experimental and simulated | S 11 | because of the effect of glue, which is applied to fix the ceramic material over substrate . The effect of adhesive material is more at high frequency as compare to low frequency because loss tangent of adhesive is largely affected by frequency . From Figure B, it is confirmed that the mutual coupling is lower than −20 dB among the different ports.…”

Fixing and Aligning Methods for Dielectric Resonator Antennas in K Band and Beyond

“…In lower microwave band, DRAs are commonly bonded to their substrates, ground plane, or feeding devices manually with nonconductive glue and soldering [18], [19]. RF conductive tapes are sometimes applied on sidewalls of DRAs to facilitate feeding and soldering [20].…”

“…However, when frequency increases, they often cause noticeable problems. For glue, unwanted unevenness, malposition, and air gaps change the designed resonant frequency and bandwidth of DRAs [11], [19]. Drilling and soldering require extra precision, and tapes are not suitable for tiny objects.…”