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Dual-band circularly-polarized shared-aperture array for C/X-Band satellite communications

Dual-band circularly-polarized shared-aperture array for C/X-Band satellite communications

Mao, Chun-Xu, Gao, Steven, Wang, Yi, Chu, Qing-Xin and Yang, Xue-Xia (2017) Dual-band circularly-polarized shared-aperture array for C/X-Band satellite communications. IEEE Transactions on Antennas and Propagation (99). pp. 1-8. ISSN 0018-926X (Print), 1558-2221 (Online) (doi:10.1109/TAP.2017.2740981)

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Abstract

A novel method of achieving a single-feed circularly-polarized (CP) microstrip antenna with both broad impedance bandwidth and axial ratio (AR) bandwidth is presented. The CP characteristics are generated by employing a resonator to excite the two orthogonal modes of the patch via two coupling paths and the required 90 o phase difference is achieved by using the different orders of the two paths. The presented method, instead of conventional methods that power dividers and phase delay lines are usually required, not only significantly enhances the bandwidths of the antenna, but also results in a compact feed, reduced loss and high gain. Based on this method, a dual-band shared-aperture CP array antenna is implemented for C/X-band satellite communications. The antenna aperture includes a 2 × 2 array at C-band and a 4 ×4 array at X-band. To accommodate the C/X-band elements into the same aperture while achieving a good isolation between them, the C-band circular patches are etched at the four corners. The measured results agree well with the simulations, showing a wide impedance bandwidth of 21% and 21.2% at C-and X-band, respectively. The C-and X-band 3-dB AR bandwidths are 13.2% and 12.8%. The array also exhibits a high aperture efficiency of over 55%, low side-lobe (C-band: −12.5 dB; X-band: −15 dB) and high gain (C-band: 14.5 dBic; X-band: 17.5 dBic).

Item Type: Article
Uncontrolled Keywords: Dual-band, CP antenna, Feed via resonators
Subjects: T Technology > TA Engineering (General). Civil engineering (General)
Faculty / Department / Research Group: Faculty of Engineering & Science
Faculty of Engineering & Science > Department of Engineering Science
Faculty of Engineering & Science > Future Technology and the Internet of Things
Last Modified: 08 Sep 2017 15:31
Selected for GREAT 2016: None
Selected for GREAT 2017: GREAT c
Selected for GREAT 2018: None
URI: http://gala.gre.ac.uk/id/eprint/17613

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