Abstract
In this paper, a new method to design multi-beam antenna based on parasitic patch and shorting-pin is proposed and demonstrated through two cases of singleand multi-source. For the single-source multi-beam antenna, by arranging the parasitic patch shorted with pins around a square patch, the beam is divided into four parts and a multi-beam radiation is realized. Also, arc slots in the parasitic patch are added to improve the bandwidth and shorting-pins located along the edges of square patch are introduced to adjust the operating frequency, gain and pitch angle. The multi-source multi-beam antenna has a similar construction with the single-source case except it has four ports. In addition, an asymmetric gap is added in the square patch to improve the isolation between the four ports. Finally, both the simulated and measured results verify the proposed methodology. The realized single-source antenna operates in the range of 5.22 - 5.42 GHz. Four beams point at (φ, 8) = (0°, 41°), (90°, 35°), (180°, 41°) and (270°, 38°). For the multi-source case, the corresponding bandwidth is 5.25 - 5.48 GHz. The radiation beams are steered to (φ, 8) = (0°, 30°), (270°, 37°), (90°, 30°) and (180°, 37°).
Highlights
The multiple beam antennas have been widely applied in mobile communication networks, multiple-target radar systems and satellite communications [1]
beamforming network (BFN) usually consist of Blass matrixes or Butler matrixes formed by power dividers, directional couplers and phase shifters
Some novel multi-beam antennas based on metasurface with a low profile have been reported [8]–[11]
Summary
The multiple beam antennas have been widely applied in mobile communication networks, multiple-target radar systems and satellite communications [1]. For single-source antenna, shorting-pins along the edge of square patch are introduced to adjust the operating frequency, gain and pitch angle. Z. Zhang et al.: Low-Profile Beamforming-Network-Avoiding Multi-Beam Antenna Based on Parasitic Patch and Shorting-Pin ports are improved by etching an asymmetric gap in the square patch. Not in its fundamental mode, square patch works in its TM20 and TM02 mode INFLUENCE OF THE ISOLATION GAP In order to improve isolation between ports, an asymmetric gap is etched in the square patch It is a resonator and forms a stop band at its resonant frequency. C. INFLUENCE OF THE OPEN RING in order to further improve the impedance matching of multi-source multi-beam antenna, an open ring around each port is introduced. The reason that the opening ring can improve impedance matching is that new capacitance is introduced by it
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