Abstract
Abstract Wideband, dual sense circularly polarized (CP), asymmetric circular slot fed by coplanar waveguide is proposed and designed. Dual polarizations are obtained by using a horizontal stub to the feed line and embedding the L-shaped strip onto the slotted ground plane. The simulated result of impedance bandwidth shows wideband performance is produced by four resonant modes. Some key parameters are studied to analyze the characteristics of the proposed antenna. The overall volume of the proposed antenna is 18 mm × 18 mm × 1.6 mm. The measured value of 10 dB impedance bandwidth is 112%at frequencies from 4.2 GHz to 14.9 GHz with voltage standing wave ratio (VSWR) ≤ 2. The 3-dB axial ratio bandwidths are 39.3% for the lower band which senses right-hand circular polarization (RHCP) and 2.8% for the upper band which senses left-hand circular polarization (LHCP) relative to the center frequency of 6.1GHz and 14.1 GHz, respectively. The proposed structure gives a good radiation pattern with moderate gain.
Highlights
The microstrip patch antenna is a new kind of radiator, which is compatible with integrated circuit technology and offers advantages such as thin profile, light weight, low price, and conformability to a shaped surface. It is usually designed for single-mode linearly polarized (LP) operation that radiates only horizontally or vertically polarized waves [1]
The 3-dB axial ratio bandwidth (ARBW) for the lower band can reach as large as 2400 MHz (4.9–7.3 GHz) with the center frequency of 6100 MHz and 3-dB ARBW for the upper band is 400 MHz (13.9– 14.3 GHz) with the center frequency of 4100 MHz
Experimental results are obtained by using an AgilentTM PNA-L series vector network analyzer
Summary
The microstrip patch antenna is a new kind of radiator, which is compatible with integrated circuit technology and offers advantages such as thin profile, light weight, low price, and conformability to a shaped surface. It is usually designed for single-mode linearly polarized (LP) operation that radiates only horizontally or vertically polarized waves [1]. A circular patch slotted with eight curves and a coaxial probe with the integrated disk generates a dual sense polarization operation that is proposed in [6]. The proposed design in [9] consists of the stacking of two truncated patches having an inclined slot and horizontal slits to produce quad-band circular polarization operation. The 3-dB axial ratio bandwidth (ARBW) for the lower band can reach as large as 2400 MHz (4.9–7.3 GHz) with the center frequency of 6100 MHz and 3-dB ARBW for the upper band is 400 MHz (13.9– 14.3 GHz) with the center frequency of 4100 MHz
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