Abstract
In this letter, a single-layer broadband wide band-ratio (ratio of f higher to f lower ) reflectarray that can achieve different linear polarizations at the X-band and the K-band is designed. Its elements consist of a split square loop with two square shaped phase delay lines (outer structure) and a phoenix square loop (inner structure) operating at the X-band and the K-band, respectively. The ingeniousness of the design is that the outer structure and the inner structure can achieve a 0° - 360° phase shift by adjusting the phase shift lines and the side length of the inner square ring, respectively. At the same time, they do not affect each other in space. Different polarizations corresponding to the two structures are orthogonal to each other, so their electrical performances do not affect each other. To verify our design concept, the reflectarray is fabricated and measured in a microwave anechoic chamber. The simulated and measured results are in good agreement. The measured gains are 23.6 dBi at 10 GHz (f lower ) with aperture efficiency of 48%, and 30.6 dBi at 22 GHz(f higher ) with aperture efficiency of 43%. The 1-dB gain bandwidths are 20% (9.1 GHz-11.1 GHz) at the X-band and 19% (19.8 GHz-23.9 GHz) at the K-band. The band-ratio of the reflectarray is 2.2. A single-layer dual-band wide band-ratio reflectarray with dual-linear polarization is confirmed.
Highlights
As a new kind of high-gain antenna, a reflectarray antenna has the advantages of a simple structure, low cost, simple feed network, flexible beam control, and so on
By using one reflectarray and two feeds operating at different bands, the satellite communication requirements can be significantly lowered, which provides cost reductions
We have considered the phase center of the feed antenna in the simulation, so the phase center of the feed antenna is installed 200 mm above the reflectarray in the higher band and 240 mm above the reflectarray in the lower band
Summary
As a new kind of high-gain antenna, a reflectarray antenna has the advantages of a simple structure, low cost, simple feed network, flexible beam control, and so on. It can be widely used in long-distance wireless communication, electronic countermeasures, and radar detection [1]. It effectively combines the advantages of a reflector antenna and a planar microstrip array antenna. Broadband wide band-ratio dual-band antennas (such as X- and K-bands) are often used in satellite communications. The first uses two different resonance elements on a single-layer dielectric substrate, and they work at different
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