Equiangular Spiral Antenna Backed by a Shallow Cavity With Absorbing Strips

Nakano, Hisamatsu; Kikkawa, K.; Iitsuka, Y.; Yamauchi, Junji

doi:10.1109/tap.2008.927573

Cited by 45 publications

(9 citation statements)

References 10 publications

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“…Figure 16 shows that the metal around the antenna sharply reduces the return loss. Reference [30] indicated that the absorbing material can improve the return loss. However, the efficiency and gain of the antenna are reduced at the same time.…”

Section: Design Of the Metallic Shell Of The Antipodal Vivaldimentioning

confidence: 99%

Antipodal Vivaldi Antenna to Detect UHF Signals That Leaked Out of the Joint of a Transformer

Zhang

Xiao

2017

International Journal of Antennas and Propagation

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In recent years, extensive research has been conducted on the ultrahigh-frequency (UHF) method. Considering that acquiring a partial discharge UHF signal is the first step in a series of tasks, such as fault diagnosis and defect location, the UHF sensor plays an important role in the UHF method. An antipodal Vivaldi antenna installed at a transformer's joint is designed in this study according to the structural features of 750 kV transformers in China. Several effective structures, such as linear gradient microstrip and slot edge, are employed to improve the return loss and radiation characteristics. A metal box is designed after analyzing the influence of the metal around the antenna. The metal box can effectively shield against electromagnetic interference and does not deteriorate the performance of the antenna significantly. Experimental data show that this antenna is much more sensitive than the rectangular plane spiral antenna. The proposed antipodal Vivaldi antenna is suitable for detecting partial discharge in large transformers.

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Section: Design Of the Metallic Shell Of The Antipodal Vivaldimentioning

confidence: 99%

Antipodal Vivaldi Antenna to Detect UHF Signals That Leaked Out of the Joint of a Transformer

Zhang

Xiao

2017

International Journal of Antennas and Propagation

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“…To eliminate backside radiation, planar spirals are generally backed by an absorber filled cavity [5]- [8] which leads to a loss in the gain. Another approach is to place a Perfect Electric Conductor plate (PEC) behind the antenna, at a quarter wavelength distance, for a specified frequency.…”

Section: Design Of Boresight Reference Antenna and Planar Printedmentioning

confidence: 99%

Dual Band Planar Spiral Feed Backed by a Stepped Ground Plane Cavity for Satellite Boresight Reference Antenna Applications

Rao

Sreenivasan

Naragani³

2009

IEEE Trans. Antennas Propagat.

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This paper presents development of a new planar spiral feed for a satellite boresight reference antenna, operating at two widely separated frequency bands (2200-2300 MHz and 8000-8400 MHz). A stepped ground plane cavity with different quarter wavelength distances is proposed to provide unidirectional patterns at these frequency bands. A back lobe suppression of around 12 dB in 2 GHz band and better than 15 dB in 8 GHz band with a measured on-axis axial ratio of less than 3 dB is achieved for the dual band planar spiral feed with stepped ground plane cavity configuration. A boresight reflector antenna employing this feed has measured beamwidths of 7 degrees and 1.8 degrees respectively and gain of 26 dBi and 36 dBi at 2250 MHz and 8200 MHz.Index Terms-Boresight reference, cavity backed feed, spiral antenna, stepped ground plane.

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“…Generally, there are two methods to realize it. One way is to add electromagnetic absorber in the backside cavity of antenna [3,4]. However, this will reduce the efficiency of the antenna, and there is a tradeoff among the cavity thickness, bandwidth, and the antenna gain.…”

Section: Introductionmentioning

confidence: 99%

Minimized Low-Profile Wideband Antennas Using High Impedance Surface

Shen¹

2017

International Journal of Antennas and Propagation

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This paper proposes minimized low-profile wideband antenna by employing high impedance surface (HIS), for wireless application scenarios at radio frequency, microwave, and even terahertz. To validate this concept with low cost and easy measurement, two prototypes at radio frequency are fabricated and tested. Firstly, antenna with dielectric-substrate reflector is proposed and analyzed and 4 × 6 HIS array is employed to minimize the antenna size to 0.57 × 0.86 × 0.078 , while maintaining antenna performances such as bandwidth, gain, and directive radiation. Secondly, a substrate-less HIS is proposed to improve the antenna bandwidth from 36% to 52% and also reduces the antenna weight by 72%.

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Equiangular Spiral Antenna Backed by a Shallow Cavity With Absorbing Strips

Cited by 45 publications

References 10 publications

Antipodal Vivaldi Antenna to Detect UHF Signals That Leaked Out of the Joint of a Transformer

Antipodal Vivaldi Antenna to Detect UHF Signals That Leaked Out of the Joint of a Transformer

Dual Band Planar Spiral Feed Backed by a Stepped Ground Plane Cavity for Satellite Boresight Reference Antenna Applications

Minimized Low-Profile Wideband Antennas Using High Impedance Surface

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