- Right Circularly Polarized
- Dual-band Circularly Polarized Microstrip Antenna For Satellite Applications
- Stacked Dual-band Circularly Polarized Microstrip Patch Antenna
A dual-band circularly polarized antenna is disclosed, which includes a ground metal plate, a dielectric substrate, a first microstrip radiation portion and a second microstrip radiation portion. The dielectric substrate is formed on the ground metal plate. Design of circular polarized dual band patch antenna Thomas Edling. Design of circular polarized dual band patch antenna Thomas Edling. The antenna should be a circular polarized and it needs to manage the harsh environment on the train. POZAR AND DUFFY: DUAL-BAND CIRCULARLY POLARIZED APERTURE-COUPLED MICROSTRIP ANTENNA 1619 Fig. Geometry of the aperture-coupled stacked-patch microstrip GPS antenna. Bandwidth of the resonance associated with the top patch as well as the coupling between the two patches. Top Patch Length and Width: The top patch must also be.
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A Novel Dual-Band Circularly Polarized Rectangular Slot Antenna
1CAST-Xi’an Institute of Space Radio Technology, Xi’an, Shaanxi 710100, China
2AVIC-Xi’an Flight Automatic Control Research Institute, Xi’an, Shaanxi 710065, China
3National Laboratory of Antennas and Microwave Technology, Xidian University, Xi’an, Shaanxi 710071, China
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Received 21 November 2015; Revised 9 March 2016; Accepted 7 April 2016
Academic Editor: Renato Cicchetti
Copyright © 2016 Biao Li et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Abstract
A coplanar waveguide fed dual-band circularly polarized rectangular slot antenna is presented. The proposed antenna consists of a rectangular metal frame acting as a ground and an S-shaped monopole as a radiator. The spatial distribution of the surface current density is employed to demonstrate that the circular polarization is generated by the S-shaped monopole which controls the path of the surface currents. An antenna prototype, having overall dimension 37 × 37 × 1 mm3, has been fabricated on FR4 substrate with dielectric constant 4.4. The proposed antenna achieves 10 dB return loss bandwidths and 3 dB axial ratio (AR) in the frequency bands 2.39–2.81 GHz and 5.42–5.92 GHz, respectively. Both these characteristics are suitable for WLAN and WiMAX applications.
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Right Circularly Polarized
1. Introduction
The rapid development in wireless communications with different standards has resulted in a huge demand for multiband antennas. Coplanar waveguide (CPW) fed slot antennas exhibit attractive features for multiband applications because of its favorable characteristics, such as wide bandwidth, light weight, low profile, less sensitivity to manufacturing tolerances, and easy integration with microwave integrated circuits. Circular polarization (CP) antennas have attracted much attention in the design of wireless systems since they are more effective in receiving and transmitting signals having arbitrary directions and polarizations. In addition, they can limit the multipath effect caused by walls and ground surfaces [1]. Moreover, the circular polarization provides better mobility and a field propagation less sensible to weather condition. Both these characteristics may prove useful in WLAN and WiMAX applications.
Several single-fed dual bands design solutions for the excitation of the circular polarization have been recently proposed in the literature [2–11]. Some of these solutions consist in the realization of an asymmetrical four-arm structure [7] or in spiral slots integrated in the ground plane [8]. A CPW-fed circular fractal slot antenna for dual-band applications has been presented in [9]. However, only few designs of coplanar waveguide single-fed dual-frequency slot antennas for circular polarization have been reported in literature [9–11]. In any case, all the mentioned antennas have a complex structure. In this paper, a novel design of a CPW-fed CP antenna with dual-band operation is introduced. The proposed antenna is formed by a rectangular metallic frame, acting as ground plane, inside which an S-shaped monopole is placed. The S-shaped monopole changes the path of the currents making the antenna more compact and suitable to excite a dual-band CP operation. The field vector composition, based on the surface current distribution flowing on the monopole and on the metal frame, is employed to explain the excitation of the dual-band CP operation. The antenna can find applications in wireless communication systems such as wireless routers and wireless access points. Details concerning the antenna design and experimental results are presented and discussed.
Dual-band Circularly Polarized Microstrip Antenna For Satellite Applications
2. Antenna Configuration and Analysis
2.1. Configuration of the Proposed Antenna
Stacked Dual-band Circularly Polarized Microstrip Patch Antenna
Figure 1 shows the geometry and the photograph of the realized antenna. The antenna is printed on a low cost FR4 substrate having thickness 1 mm, dielectric constant 4.4, and loss tangent 0.02. The area of the antenna is × . and are the width and height of the rectangle slot. The S-shaped monopole, composed of 6 straight metal sections of width and the lengths of , , , , , and , respectively, is fed by the coplanar waveguide. The CPW, designed for a 50 Ω characteristic impedance, consists of a stripline having width equal to 2 mm and a gap of 0.25 mm, respectively. The feed line is terminated with a standard SMA connector.