Abstract
AbstractA bidirectional antenna, which is useful in coal mine or tunnel wireless communication, is proposed in this article. The antenna consists of a probe excited rectangular ring. The dimensions of the rectangular ring are 147 × 20 × 40 mm3 (0.45λ × 0.06λ × 0.12λ). The length of the feeding probe is 15 mm (0.045λ). The measured −10 dB bandwidth is ∼14 MHz (910–924 MHz), and the corresponding peak gain is 5.8 dBi. Radiation patterns are measured and compared to the simulation results. The proposed bidirectional antenna has the advantages of low cost, low‐profile, easy fabrication, small cross‐section to the ventilation direction, and good bidirectional radiation. © 2013 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:1412–1416, 2013; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.27552
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