A dual-band TEM lens for a multiple beam antenna system

Luh, H.; Smith, T.; Scott, W.

doi:10.1109/tap.1982.1142773

Cited by 4 publications

(2 citation statements)

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“…As for the homogenous lens, conventional lens antennas of hyperbolic-planar, plano-convex, and spherical convex are exist [18]- [21]. The lens surface of these lenses is given by simple equations making them very practical.…”

Section: Introductionmentioning

confidence: 99%

Best Feed Positions and Radiation Patterns of Typical Multibeam Dielectric Lens Antenna

Muhsin,

Kamardin,

Yamada

et al. 2024

IEEE Access

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Multibeam base station antennas are introduced for 5G and 6G mobile communication systems. Considering higher frequency bands such as millimeter waves for 5G and terahertz for 6G, dielectric lens antennas become promising candidates due to their simple antenna configuration and excellent multibeam radiation characteristics. Therefore, it is important to identify the best multibeam antenna from the existing typical lens antennas. In this article, a shaped lens and some conventional lenses are considered. For the conventional types, the hyperbolic-planar, plano-convex, and spherical-convex are selected. As for the shaped lens, Abbe's sine condition lens is selected. This research begins by finding the best feed position of four types of lenses. A MATLAB program is developed to find the smallest distance point for all focal region rays. Based on this point, the feed position is selected and multibeam radiation patterns of four lenses are obtained. It is shown that the spherical-convex lens can achieve the highest gain and the smallest beam shape degradation. High gain characteristics are obtained until a 35 • beam shift. As for sidelobe characteristics, Abbe's sine condition lens has the lowest sidelobe level. These properties are then clarified using amplitude and phase distribution on the aperture plane. Furthermore, focal region ray concentration changes by F/D and refractive index are discussed for practical applications.INDEX TERMS focal region, ray tracing, multibeam antenna, lens antenna, millimeter wave

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Section: Introductionmentioning

confidence: 99%

Best Feed Positions and Radiation Patterns of Typical Multibeam Dielectric Lens Antenna

Muhsin,

Kamardin,

Yamada

et al. 2024

IEEE Access

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“…Dual-band lens with widely separated frequency bands has been reported to be suitable for use in geostationary satellites [3]. Such lens antenna, which is made by using several printed circuit cards as inner and outer layer faces and a set of coaxial TEM transmission lines interconnecting two array faces, provides bandwidths of 13.7 and 8% for centre frequencies of 3.65 and 5.7 GHz, respectively.…”

Section: Introductionmentioning

confidence: 99%

Dual‐band, dual‐polarised metallic slot transmitarray antenna

Bagheri

Hassani

Rahmati

2016

IET Microwaves, Antennas & Propagation

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A metallic, dual‐band, dual polarised slot‐based transmitarray antenna is presented. The antenna consists of three thin metallic layers do not use any dielectric substrates, with air gaps in between the layers. The unit cell uses interleaved orthogonal slots, as well as crossed‐dipole slot and uniplanar compact photonic bandgap slot elements to provide the lower and upper frequency band resonators, respectively. The frequency separation between the two resonances can be adjusted from closely spaced to far from each other. The antenna provides dual linear polarisation and circular polarisation with the use of the appropriate feed. The fabricated transmitarray antenna provides two independent frequency bands with a band ratio of 1.13 and low mutual coupling. The measurement of a 14 × 14 element transmitarray antenna at 11 GHz shows a maximum gain of 23.74 dB with −1 dB gain bandwidth of 6.8% and aperture efficiency of 38%; at 12.5 GHz, a maximum gain of 24.45 dB is obtained with −1 dB gain bandwidth of 5.4% and aperture efficiency of 34.6%. The antenna is simulated by using the CST software; the ADS package is used for equivalent circuit simulation.

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