A lower bound to the broad-band power scattered from an electrically linear antenna with a general lumped load

Bevensee, R. M.

doi:10.1109/8.24183

Cited by 4 publications

(2 citation statements)

References 5 publications

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“…In order to improve the bandwidth and radiation performance of the antenna, top-loading [3][4][5], loading network [6][7][8], broadband matching network [9][10][11], fractal technology [12][13][14], and other methods have been proposed. At present, loading and matching network technology is widely used, because the introduction of impedance elements greatly improves the standing wave, but it brings new loss to the antenna and greatly reduces its gain and efficiency.…”

Section: Introductionmentioning

confidence: 99%

Switchable design of a frequency reconfigurable broadband whip antenna in high frequency

Wang

Liu

2020

Int. J. Microw. Wireless Technol.

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In this paper, the antenna reconfigurable technology is used to redesign a whip antenna in different sub-bands of high frequency (HF). According to the electrical characteristics of the antenna, on the one hand, two different radiation whip heights are designed to solve the problem of pattern up-warping in the high-frequency band; on the other hand, a common upper loading network and several different adjusting inductors and matching networks are designed for each sub-band to achieve high gain and efficiency when keeping good voltage standing wave ratio (VSWR) characteristics. Five sub-bands of the 10-m HF whip antenna are reconfigured through the actual selection of radiation height, adjusting inductance, and matching network by radio frequency (RF) switch. The antenna load and matching network are optimized by grasshopper optimization algorithm (GOA), and integrated into the antenna body by using the printed circuit technology. The scaled prototype of 1 m frequency reconfigurable antenna is manufactured and tested, which shows that the VSWR is all <3 with an average value of 2.14; the gain is all >−2.5 dB with an average value of 3.90 dB; the efficiency is all >18.2% with an average value of 71.59%, and the patterns all keep horizontal omnidirectional without the phenomenon of up-warping.

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Section: Introductionmentioning

confidence: 99%

Switchable design of a frequency reconfigurable broadband whip antenna in high frequency

Wang

Liu

2020

Int. J. Microw. Wireless Technol.

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“…In high frequency band, the effective length of antenna is far larger than 1/4 wavelength, the reverse phase current on the oscillator increases continuously, the maximum direction of the antenna pattern deviates from the horizontal direction, and the phenomenon of ''warping'' appears, which results in the antenna can't satisfy the short-range and medium-range communication in the high frequency band. In order to improve the bandwidth and radiation performance of antennas, top loading [3], [4], loading network [5]- [7], broadband matching network [8]- [10],…”

Section: Introductionmentioning

confidence: 99%

A Novel HF Broadband Frequency-Reconfigurable Whip Antenna With Radiation Blades Loading

et al. 2019

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Aiming at the problems of low gain, low efficiency in low frequency band and warping pattern in high frequency band of the existing HF broadband whip antenna, this paper introduces frequency reconfigurable antenna technology and radiation blades loading technology to redesign whip structure, loading and matching network in different bands, and designs a kind of frequency-reconfigurable whip antenna with improved gain and efficiency. The whip body structure, loading and matching network structure of the antenna in each band are optimized, and the on-off control is carried out through the radio frequency switch according to the actual needs. The results show that the standing wave ratio of the proposed antenna is all less than 3, the average value is 2.32; the gain is all greater than -2dB, the average value is 3.63dB; the total efficiency is all over 20%, the average value is 72.77%, and the pattern keeps horizontal omnidirectional in the whole short wave band without upward warping phenomenon.INDEX TERMS Frequency-reconfigurable technology, radiation blades loading, broadband antenna, lumped loading, matching network, grasshopper optimization algorithm.

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On the coupling between MS antennas

Richie

Biedlingmaier

1990

International Symposium on Antennas and Propagation Society, Merging Technologies for the 90's

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A lower bound to the broad-band power scattered from an electrically linear antenna with a general lumped load

Cited by 4 publications

References 5 publications

Switchable design of a frequency reconfigurable broadband whip antenna in high frequency

Switchable design of a frequency reconfigurable broadband whip antenna in high frequency

A Novel HF Broadband Frequency-Reconfigurable Whip Antenna With Radiation Blades Loading

On the coupling between MS antennas

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