Abstract
Many wireless communication applications such as satellite communications use circularly polarized (CP) signals, with the requirement for easy switching of the polarization sense between uplink and downlink. Specifically, in satellite communications, the trend is also to move to higher frequencies and integrate the receiving and transmitting antennas in one dual-band terminal. However, these simultaneous demands make the design and fabrication of the composing parts very challenging. We propose, here, a dual-band dual-linear polarization (LP)-to-CP converter that works in the transmission mode. The working principle of this polarizer is explained through an example for Ka-band satellite communications at 19.7–20.2 and 29.5–30 GHz. The LP-to-CP converter is a single panel composed of identical unit cells with a thickness of only 1.05 mm and a size of 5.3 mm $\times5.3$ mm. Due to its operation in the transmission mode, the polarizer can be combined with a simple dual-band dual-LP antenna to obtain the desired dual-band dual-CP single antenna. However, the unique property of this polarizer is yet the fact that it converts a given LP wave, e.g., x-polarization, to orthogonal CP waves at the two nonadjacent frequency bands, e.g., left-handed CP at lower band and right-handed CP at higher band. The polarizer is tested both with 20 and 30 GHz LP rectangular horns to illuminate a dual-band transmit array (TA) to obtain wide-angle steering of CP beams. The performance of the polarizer and its association with the TA is evaluated through simulation and measurements. We also present design guidelines for this type of polarizer.
Highlights
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This paper focuses on a new compact and efficient dualband dual-circularly polarized (CP) that can be used to create an antenna satisfying all the previously identified aperture-feeding requirements for user terminals in multispot satellite communication systems
We demonstrate the performance of the polarizer fed by an linear polarization (LP) horn to illuminate a high-gain dual-band wide-angle beam steering transmit array (TA)
Summary
N SOME applications such as satellite and point-tomultipoint communications, circular polarization (CP) is preferred over linearly polarized (LP) radiation because it is less influenced by multipath fading and by polarization mismatch associated with ground terminal mobility [1]. The literature offers another way of generating CP EM fields by combining an LP antenna and a polarization converter to avoid the above-mentioned shortcomings of conventional CP antennas. It only works for x-LP incident wave, imposing a fixed CP handedness at the low and high bands This precludes the use of this type of cell for mobile satellite applications requiring polarization switching for handover purposes as described earlier. Together they form a low-profile dual-band dual-CP user terminal antenna for.
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