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Journal Article
Bandwidth enhancement of a low‐profile monopole antenna embedded in a circular cavity on a manhole cover
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- Authors
- Gyu-Myeong Song, Jeong-Ung Yoo, Hae-Won Son, Eun-Hee Kim, In-Hwan Lee
- Issue Date
- 2022-03
- Citation
- International Journal of RF and Microwave Computer-Aided Engineering, v.32, no.3, pp.1-7
- ISSN
- 1096-4290
- Publisher
- Wiley
- Language
- English
- Type
- Journal Article
- Abstract
- This article presents a low-profile disk-loaded monopole antenna specifically designed to be embedded into a manhole cover and a method to improve the bandwidth of the antenna. The antenna is placed deep inside a circular cavity formed on a manhole cover and is covered with a thick radome to protect the antenna from strong external impacts. The effect of the cavity size on the bandwidth of the antenna was studied, and as a result, it was found that the bandwidth of a low-profile monopole antenna is greatly enhanced when the cavity diameter is about one wavelength. The bandwidth enhancement mechanism due to the cavity size is analyzed in terms of the quality factor (Q) of the antenna. A prototype was fabricated and measured; the disk-loaded monopole antenna with a diameter of 0.2{\\lambda}0 and a height of 0.04{\\lambda}0 ({\\lambda}0 is the free-space wavelength at the center frequency) provides a wide impedance bandwidth of 14.3% (10-dB return loss) when placed inside a cavity with a diameter of 0.82{\\lambda}0 and a depth of 0.1{\\lambda}0. The antenna radiates vertically polarized omnidirectional fields in the horizontal direction and has a stable measured peak gain that varies from 4.5 to 5.5 dBi across the measured impedance bandwidth.
- KSP Keywords
- Bandwidth enhancement, Cavity diameter, Cavity size, Center frequency, Circular Cavity, Enhancement mechanism, Low-profile monopole antenna, Manhole Cover, Measured impedance, Quality factor(VSWR and Q), Return Loss