Design of spiral slot‐based dual‐wideband dual‐sense CP antenna

Abstract

A dual‐wideband dual‐sense circularly polarised (CP) planar slot antenna with a simple structure is presented and studied in this study. By etching a simple spiral slot on the planar ground, adopting an L‐shaped strip as the radiator, and employing smooth transition structure, the dual‐wideband impedance bandwidths (IBWs) and dual‐wideband 3 dB axial‐ratio bandwidths (ARBWs) of the proposed CP antenna can be easily realised. The measured 10 dB return loss IBWs is 111.1% (0.88–3.08 GHz) for the lower band [left‐hand CP (LHCP)] and 42.1% (3.64–5.58 GHz) for the upper band [right‐hand CP (RHCP)]. The measured 3‐dB ARBWs is 92.9 and 39.4%, with respect to 1.83 GHz (LHCP) and 4.6 GHz (RHCP), respectively. The radiation patterns of this antenna are good within both two CP bands. This antenna is very suitable for multi‐band communication systems for its dual‐wideband CP performance.

CPW-Fed Ultra-Wideband Dual-Sense Circularly Polarized Slot Antenna

“…The designs presented in [14][15][16][17][18] are composed of single CPW-fed radiator to achieve dual CP operation. The dual-band dual-sense polarization based antenna structures reported in [19,20] are composed of an L-shaped radiating patch and modified ground plane. Since only a few studies are available on UWB dual-sense CP antennas, Table 2 is updated with [12,13] as the designs mentioned here consisting of a two-port CPW-fed antenna to generate dual circular polarization.…”

“…Since only a few studies are available on UWB dual-sense CP antennas, Table 2 is updated with [12,13] as the designs mentioned here consisting of a two-port CPW-fed antenna to generate dual circular polarization. However, the antennas mentioned here [12][13][14][15][16][17][18][19][20] have relatively large size and narrow impedance and CP bands.…”

“…A CPW-fed slot antenna consisting of inverted L-shaped and asymmetric U-shaped slots for dual-frequency and dual circular polarization was proposed [19]. A CPW-fed wideband CP monopole antenna composed of an asymmetric ground plane and a square-ring with an opening at the lower edge was reported [20]. However, the abovereported CP antennas have smaller ARBW, relatively large size, limited resonating bands, complicated geometry with decoupling elements, and external feeding circuitry.…”

“…The antenna is fabricated, and experimental results are found in good agreement with the simulated ones. The proposed UWB antenna features a small size and broad 3-dB ARBW as compared to the antennas reported in the literature [11][12][13][14][15][16][17][18][19][20]. The antenna is suitable for polarization diversity and UWB communication systems.…”

A Quad-Band Dual-Sense Circularly-Polarized Square-Ring Antenna for Multi-Functional Wireless Applications

“…Numerous studies addressing the planar antenna with dual-band dual-sense CP characteristic have recently been presented. To this end, slot and monopole structures have been used in various configurations [7]- [10], i.e., coplanar waveguide-fed monopole [7], square-slot [8], spiral slot [9], and tilted D-shaped monopole [10]. These dual-sense CP antennas achieved wide dual-band ARBW.…”