Broadband circularly polarized dielectric resonator antenna with L‐shaped dielectric resonator strips

Abstract

A broadband circularly polarized dielectric resonator antenna (CP DRA) with L‐shaped dielectric resonator strips (DRS) is presented. The antenna is composed of a square DR, four L‐shaped DRS and a square ground plane etched with cross‐slot. A stepped‐microstrip feeding line is used to adjust the impedance bandwidth (IBW). It is noted that not only the interaction of the cross‐slot and square DR could excite CP resonant points, but the four L‐shaped DRS can also stimulate a CP resonant point in high frequency. Through utilizing these resonant modes, the CP bandwidth of the proposed DRA could be enhanced greatly. The measured results depict the designed DRA has a broad −10‐dB IBW of 44.7% (2.55, 1.98‐3.12 GHz), and a 3‐dB axial‐ratio bandwidth of 38.7% (2.53, 2.04‐3.02 GHz).

Performance Enhancement of a Compact Circularly Polarized Slot Antenna Using Corner Truncation

“…The working principle of CP antennas is to stimulate two symmetrical modes with equivalent amplitude and in-phase quadrature. This can be accomplished by presenting some symmetrical and (or) unsymmetrical perturbations into wide slot or ring slot antennas [2][3][4][5][6][7][8][9][10][11][12][13][14][15][16]. These designs include embedding L-shaped structures in the ground plane from the opposite corners, and the further process by adding more L-shaped structures leads to generating a resonant mode for exciting two orthogonal E vectors which give a better result in terms of enhancement in the axial ratio part [2,3,18].…”

“…These designs include embedding L-shaped structures in the ground plane from the opposite corners, and the further process by adding more L-shaped structures leads to generating a resonant mode for exciting two orthogonal E vectors which give a better result in terms of enhancement in the axial ratio part [2,3,18]. Also, by using L-shaped dielectric resonator strips (DRSs) circular polarization can be achieved in terms of dielectric resonator antenna (DRA) [4]. By utilizing the insertion of feeding techniques [5][6], parasitic strips [7][8][9]14], G-shaped parasitic patch [10], annular ring slot structures [11][12][13], and finally MIMO antenna [15] and MIMO antenna array [16] designs have also been proposed earlier.…”

A novel ultra wideband circularly polarized stacked cylindrical dielectric resonator antenna with modified ground plane

“…Obtaining wideband CP response over a wide range of frequency is still a challenging task. However, to obtain wide CP behavior in DRA, some of the researcher's implemented excitation through ground slot, [14][15][16] feeding method, [17][18][19] cross feed 20 and stacked DR. [21][22][23] In these structures orthogonal modes are generated which will provide circular polarization behavior in DR. These DRs provide Impedance Bandwidth (IBW) in the range of 20%-50%, Axial Ratio Bandwidth in the range of 30%-50% and gain in the range of 1-5 dB.…”

High Gain and Wideband Multi-Stack Multilayer Anisotropic Dielectric Antenna

“…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]. Several methods for gain and bandwidth enhancement of the DRAs have been reported such as: using electromagnetic bandgap structure [12], using DRA in its higher modes [13], employing short horn around DRA [14], and using non-transparent conducting sheet as superstrate [15].…”