Abstract
A novel FSS-Backed reflectarray unit cell is introduced to design a dual-band X/Ku Reflectarray Antenna (RA). A Ku-band RA based on this FSS-Backed cell element is designed and located on the top of a conventional X-band RA. Actually, the band-stop Frequency Selective Surface (FSS) property is applied to a wideband element to create isolation between X and Ku band RAs which utilizing the same radiating element. A wideband cell element with attached quasi-spiral phase delay line is employed for phase compensation in both bands. As a FSS-backed cell element, the remarkable feature of the proposed dual band unit cell compared to previous works is its possibility of operation in closer frequency bands in comparison with other dual band FSS-backed RAs. Two reflectarrays with aperture size of 7.65λ×7.65λ and 7.35λ×7.35λ are designed, fabricated and measured for X band and Ku band, respectively. Measured results show 1-dB gain bandwidth of 12% for X band and 11% for Ku band which demonstrate wideband operation of this dual-band reflectarray antenna.
Highlights
Reflectarray antennas compared to other high gain antennas are used extensively in some long distance communication systems, due to their numerous advantages
Two Reflectarray Antenna (RA) are designed and fabricated for dual band operation in X and Ku band. Both RAs are exploiting an element with attached phase delay lines as the main radiating element while a double layer Frequency Selective Surface (FSS) element is added beneath the Ku-band (17-19 GHz) element to obtain transmission property in X-band (8-9 GHz) and simultaneously simulating the ground plane in Ku band
A new element consisted of a ring with four quasi-spiral delay lines was utilized as the unit cell element
Summary
Abstract— A novel FSS-Backed reflectarray unit cell is introduced to design a dual-band X/Ku Reflectarray Antenna (RA). The band-stop Frequency Selective Surface (FSS) property is applied to a wideband element to create isolation between X and Ku band RAs which utilizing the same radiating element. As a FSS-backed cell element, the remarkable feature of the proposed dual band unit cell compared to previous works is its possibility of operation in closer frequency bands in comparison with other dual band FSS-backed RAs. Two reflectarrays with aperture size of 7.65λ×7.65λ and 7.35λ×7.35λ are designed, fabricated and measured for X band and Ku band, respectively. Measured results show 1-dB gain bandwidth of 12% for X band and 11% for Ku band which demonstrate wideband operation of this dual-band reflectarray antenna
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