Abstract
Satellite communication systems require dual-band circularly polarized (CP) waves to integrate receiving and transmit antennas into one dual-band terminal. Polarization converters play an important role in such a scenario to convert the incoming linearly polarized (LP) signal into the transmitted CP signal. Wide-band and wide-angle performance for the transmission based dual-band polarization converters has been a challenge. In this paper, a transmission-based linear polarization to circular polarization (LP-to-CP) converter is presented using a very simple and thin metasurface based structure. The proposed metasheet is uni-layered, patterned with a circular diagonal split ring enclosed in the square ring. The idea for dual-band polarization conversion is verified with an example in which x(y) polarization is converted into LHCP(RHCP) in Ku-band (15.25~18.9 GHz), and RHCP(LHCP) in Ka-band (29.7~36.7GHz). The converter performs polarization conversion for both bands over 21% of bandwidth which is very wide. Moreover, it maintains performance over wide-angled oblique incidences. Dual-band performance is analyzed theoretically, numerically, and experimentally. The equivalent circuit model is also presented for the unit cell. This metasheet has simple and low-cost design, wide polarization conversion bandwidths, polarization diversity, and wide-angle performance which are very promising for future communication systems.
Highlights
High-speed communication systems have required the advancements in wireless communication networks including satellite communication
The circularly polarized (CP) waves readily have the advantages over linearly polarized waves because of strong anti-interference ability and very small degradations caused by multi-path fading and Faraday’s rotation
Vector Network Analyzer (VNA) AV3672C was used for the measurement of transmission parameters
Summary
High-speed communication systems have required the advancements in wireless communication networks including satellite communication. Polarization of electromagnetic waves is an important parameter, which is the direction of rotation of electric field vector while it travels through a medium. The CP waves readily have the advantages over linearly polarized waves because of strong anti-interference ability and very small degradations caused by multi-path fading and Faraday’s rotation. Transmission using CP waves has gained much attention [4]. These waves can be generated using CP antennas such as dipoles [5], helical, and spiral antennas [6], [7]. For dual-band CP waves generation, one needs multi-feed or shared aperture antennas [8]–[11] whose design complexities at high frequencies
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