期刊
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
卷 68, 期 5, 页码 4109-4113出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TAP.2019.2948679
关键词
Broadband antenna; circularly polarized (CP); pattern-reconfigurable array
A design for single-fed circularly polarized (CP) antennas with broadband operation and high front-to-back ratio is first described. The antenna is mainly composed of a monopole slot, a dipole, and a metallic box. When the monopole slot is operated in its half-wavelength mode, the radiated fields of the slot and dipole have the same amplitudes and 90 degrees phase differences; in addition, the two radiating elements are arranged in an orthogonal configuration. Consequently, a CP radiation is obtained. Then, the CP antenna is adopted as a radiating element of a 3-D array, and a feed network composed of power dividers is used to excite the array. Both the simulated and measured results prove that the CP array can give a nearly omnidirectional pattern, bidirectional patterns with 8 dBi directivity, and scanned beams with a directivity of 11 dBi. Moreover, the half-power beamwidth of the scanned beam can be changed among 48 degrees, 124 degrees, and 240 degrees. The total size of the array is about 1.5 lambda(0) x 1.5 lambda(0) x 2.5 lambda(0). Details of the designs for the CP element and array are presented.
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