Tri-band composite cylindrical dielectric resonator antenna with hybrid mode excitation and cross-polarization suppression

Abstract

This communication investigates composite cylindrical dielectric resonator antenna (CDRA) for various wireless applications. Three important features of proposed antenna design are (i) realization of two different hybrid modes, that is, HEM11δ and HEM12δ mode in CDRA with the help of modified annular ring printed line (work as both magnetic dipole and electric dipole), both the hybrid modes support broadside radiation characteristics (ii) suppression of HEM21δ mode, in order to reduce the cross‐polarization level in H‐plane of other hybrid modes (HEM11δ and HEM12δ mode) by an amount of 8‐10 dB (iii) creation of triple‐band attribute using the concept of composite antenna. The proposed antenna design has been fabricated and practically tested. Simulated outcomes show good agreement with measured outcomes. It works in three frequency bands, that is, 2.25‐2.79 GHz, 3.1‐4.0 GHz, and 5.05‐5.6 GHz. The designed antenna structure is appropriate for WLAN and WiMAX applications.

Investigation on Circularly Polarized Ring Dielectric Resonator Antenna for Dual-Band Wireless Applications

“…From Table 2, it can be observed that the proposed structure provides better impedance bandwidth than others. As we can see, the impedance bandwidth in [13] in lower frequency band is better than the proposed antenna structure. However, [13] is based on hybrid antenna technique, which does not provide complete advantages of DRA, i.e., gain fluctuations are very high.…”

“…As we can see, the impedance bandwidth in [13] in lower frequency band is better than the proposed antenna structure. However, [13] is based on hybrid antenna technique, which does not provide complete advantages of DRA, i.e., gain fluctuations are very high. The proposed radiator overcomes the drawback of hybrid radiators.…”

“…Sharma and Gangwar presented the combination of a dual-segment cylindrical DRA with annular ring shape microstrip line printed in order to obtain triple band operation [12]. Similarly, the same research group proposed a hybrid radiator, which is the grouping of annular ring metallic line and cylindrical DRA for multiband applications [13]. Gangwar et al proposed a hybrid triple-band cylindrical DRA with two broadsided mode excitation, i.e., HEM 11δ and HEM 12δ [14].…”

Bandwidth Enhancement of Tri-band Rectangular Dielectric Resonator Antenna using Novel Offset Feed for WLAN/WIMAX Applications

“…If the length of the ground plane is changed, there occurs variation in return loss characteristics [6] . Better return loss is obtained when the length of the ground plane is changed from 50mm to 16mm.…”

“…The return loss plot of proposed design is shown in Fig7. Conformal strips are used for gain and bandwidth enhancement [6][7][8] .…”