Theory and simulation of 3 mm conical horn focusing lens antennas

Jianming, Tang; Zhao, Qing; Liang, Zheng; Shuzhang, Liu; Luo, Xiangang

doi:10.3788/hplpb20122402.0436

Cited by 1 publication

(4 citation statements)

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“…The bandwidth performance is presented in Tables III and IV, respectively. It is generally believed that when the average SD is less than two wavelengths, the antenna has better focused electromagnetic wave [2]. In the low frequency band, the average SD is less than two wavelengths in the range of 11.8-12.2GHz, so the bandwidth is from 11.8 to 12.2GHz.…”

Section: ⅲ Measured Results and Discussionmentioning

confidence: 99%

“…It can be observed that the required phase shift is greater than 360° if the emitted electromagnetic wave is focused at a focal length form the array aperture. Considering the periodicity of the phase, the transmission phase of each element on the transmitarray can be obtained quickly according to equation (1) and equation (2) and using MATLAB programming. The phase distributions at 12 GHz and 18 GHz are shown in Fig.…”

Section: ( )mentioning

confidence: 99%

“…The traditional dielectric lens is usually adopted in the design of the focused antenna, and Teflon is mostly used as the lens material. The ray-optics theory is used to write an equation describing the lens profile, that is, the optical path from the feed to each point on the lens surface must be equal [2]- [5]. For example, in [2], a focused lens horn antenna with different spread angle has been studied.…”

Section: Introductionmentioning

confidence: 99%

“…The ray-optics theory is used to write an equation describing the lens profile, that is, the optical path from the feed to each point on the lens surface must be equal [2]- [5]. For example, in [2], a focused lens horn antenna with different spread angle has been studied. When the spread angle of horn is 30°, the focal spot diameter of the antenna is less than 2 times the wavelength.…”

Section: Introductionmentioning

confidence: 99%

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Dual-Band Focused Transmitarray Antenna for Microwave Measurements

Zhang

Sun

et al. 2020

IEEE Access

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A dual-band focused transmitarray antenna designed by using frequency selective surfaces (FSS) technique is proposed in this paper. Compared with the traditional transmitarray antenna, the proposed antenna has advantages of good ability to focus electromagnetic wave in the dual-band, high resistant of poor measurement environment and easy to process. The transmitarray consists of four identical metal phase shift layers, each of which is separated by an air gap. The elements distributed on metal layer are composed of a I-shaped slot at the center and four L-shaped slots with central symmetry. The change of I-shaped slot length affects the change of phase in low frequency band and the change of L-shaped slot length affects the change of phase in high frequency band. The mutual coupling between the two kinds of slots can be neglected. The proposed antenna consisting of a transmitarray and a feed has been analysed, simulated, and measured. The results show that the average focal spot diameter (SD) is 35.2 mm at 12 GHz and 24.5 mm at 18 GHz, and the dual-band focused transmitarray antenna can operate in two frequency bands 11.8-12.2 and 17.8-18.1 GHz. Simulated and measured results show that the proposed antenna has good concordance, making it possible for various microwave measurements. INDEX TERMS Focused; all metal elements; dual-band; transmitarray antenna; frequency selective surfaces (FSS).

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Section: ⅲ Measured Results and Discussionmentioning

confidence: 99%

Section: ( )mentioning

confidence: 99%