A New Bidirectional Wideband Circularly Polarized Cylindrical Dielectric Resonator Antenna using Modified J-shaped Ground Plane for WiMAX/LTE Applications

Abstract

A new singly-fed bidirectional wideband circularly polarized cylindrical dielectric resonator antenna (CDRA) using modified J-shaped ground plane is investigated and presented in this paper. The designed antenna excited by a single microstrip feed line with the modified Jshaped ground plane, which supports the orthogonal mode generation i.e. HEM 11δ mode for realizing circular polarization (CP). Measured results show that the proposed antenna achieved S 11 ≤-10 dB, input impedance bandwidth of 41.44% (centered at 3.74 GHz) and 3-dB axial ratio bandwidth in broadside direction of 29.91% (centered at 3.61 GHz). The average measured gain and simulated radiation efficiency in broadside are 2.84 dBic and 94.69% respectively, throughout the working band. The proposed CPDRA is a bidirectional radiator, and the radiation patterns on both sides are nearly the same. The antenna radiates left-handed CP wave in +z-direction and right-handed CP wave in-z-direction for both the resonance frequencies, which has been confirmed by plotting CP radiation pattern. The presented design can be used for Wi-MAX (3.3-3.7 GHz) and LTE3400 (3400-3800 MHz) bands.

A Review of Circularly Polarized Dielectric Resonator Antennas: Recent Developments and Applications

“…The AR bandwidth can be enhanced by a slight modification in the DR's shape, by loading a metal strip onto the DR, and adjusting the feed structure. Metal strip [42], microstrip feedline [43,44], coaxial probe [45][46][47][48], and aperture coupling [49][50][51][52] methods are commonly used in single-feed antennas. The selection of the feed arrangement may depend on the antenna's application.…”

A compact Ultra Wideband dielectric resonator antenna with dual‐band circular polarization characteristics

“…Table 2 illustrates the comparison of the proposed UWB dual‐band CP DRA with other wideband CP DRA. CP DRAs have been introduced in References 14 to 27 In most of the cases, the impedance bandwidth and axial ratio bandwidth are much lower than the proposed antenna.…”

“…In Reference 18, it is seen that the antenna provides dual polarization impedance bandwidth covers only 17.2 and 17.9%. In References 20 to 23, the antennas provide only 37.29, 44.78, and 30.07% impedance bandwidth. The antenna achieves 41.41% impedance bandwidth.…”

“…A significant volume of research has been dedicated to various design methodologies for generating circular polarization, accordingly different types of antennas have come up in due course of research. 12 Several design methodologies of DRAs have been proposed 5,[15][16][17][18][19][20][21][22][23][24] to achieve circular polarization by creating stair-shaped DR, 17 stacked DR, 5 spidron fractal DR, 19 and others.…”

Dual Band Microstrip Semicircular Slot Patch Antenna for WLAN and WIMAX Applications

“…Antenna operates at dual band 2.4-2.48 GHz and 5.25-5.85 GHz for WLAN and WIMAX. In [21] a cylindrical dielectric antenna with operating frequency at 3.75 GHz is proposed for WIMAX/WLAN applications. Reflection coefficient of -21.55 dB is observed at central frequency.…”