Abstract
A new beam scanning method of a Fabry–Perot cavity (FPC) antenna is proposed. To obtain high gain in a target direction with a reduced sidelobe level (SLL), we devised a tapered partially reflective surface (PRS) as a superstrate. Moreover, to attain various beam scanning directions, a phase-controllable artificial magnetic conductor (AMC) ground plane with a broad reflection phase range and high reflection magnitudes was introduced. In the proposed method, a new formula to satisfy an FP resonance condition in a cavity for a scanned beam is also suggested. According to the formula, the FPC antenna can precisely scan the main beam in designed target directions with well-maintained high gain, which has been hardly achievable. In addition, our method demonstrates the potential of electrical beam-scanning antennas by employing active RF chips on the AMC cells. To validate the method, we fabricated a prototype FPC antenna for a scanned beam at θ = 30°. Furthermore, we conducted an additional simulation for a different beam scanning angle as well. Good agreement between the expected and experimental results verifies our design approach.
Highlights
In state-of-the-art communication technologies, high gain antennas with a beamscanning ability have been receiving considerable interest to secure a longer and broader communication area
We can find that the impedance matching is slightly deteriorated for θt = 45°. This is owing to the large variation of reflection phases of artificial magnetic conductor (AMC) cells compared to the other cases, which needs to be Impedance matching results for different scan angles are pl firm that our idea is still valid for other beam-scan directions b ducted additional simulations for θt = 0°, θt = 15°, and θ9 otf =12 45°
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Summary
In state-of-the-art communication technologies, high gain antennas with a beamscanning ability have been receiving considerable interest to secure a longer and broader communication area. Among various high gain antennas, phased-array [1,2] and reflectarray [3,4,5] antennas are especially renowned due to their beam-forming abilities. The phased-array antennas demand complex feeding networks and phase shifters because of the many radiating elements, which causes high complexity and high expense. The reflect-array antennas do not require complex feeding networks as they usually employ only a single excitation source. Considering electrical beam-scanning [5], the reflect-array antenna is more favorable than the phased-array antenna because a bias network controlling each active element in the reflect-array is much simpler than the phase shifting of the phased-array antenna. The reflect-array antenna requires quite a long feeding distance between a reflect-array and a feeding antenna to guarantee high illumination and accurate reflection behaviors of each cell [3,4,5], making the antenna too bulky for commercial applications
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