科研之友
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摘要
Printed monopole antennas fed by microstrip lines can provide a wide bandwidth and can be employed as terminal antennas in RF circuits. In the same perspective, the authors propose a novel planar array in which N+1 parasitic monopoles, properly placed in a linear array where only N directly-fed monopoles are used, allow a broadside radiation and a gain value close to that of a standard printed array composed of 2N+1 directly-fed elements. To verify the validity of the proposed design, prototype arrays for the S and C bands, composed of five- and nine-monopoles, are simulated, fabricated and tested. In addition, it is demonstrated that a flat metal sheet placed at 0.25 (0) from the array board can further increase the directivity of about 3dB; as a result, the measured gain is approximate to similar to 10dB for the five-monopole array and 14dB for the nine-monopole array. Owing to their large fractional bandwidth (30%) and high gain, these monopole arrays may work as external antennas for high-data-rate point-to-point transmissions or for C-band radar sensors.
- 出版日期2017-9-8
