Effects of the Feeding Structure on Low-THz Bull's Eye Antennas

Kampouridou, Despoina; Feresidis, A.P.

doi:10.1049/cp.2018.0440

Cited by 7 publications

(3 citation statements)

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“…The antenna in all the studies of this Section is fed by a subwavelength slot with dimensions optimized to (s x , s y )=(0.5838 mm, 0.159 mm), which is, in turn, fed by a typical WR-3 waveguide on the rear side of the metallic body of the antenna. This optimized slot secures an S 11 below -10 dB at the operational gain bandwidth, which results in a very similar gain and directivity performance [19].…”

Section: The Dual-depth Conceptmentioning

confidence: 92%

“…The proposed 10-ring dual-depth antenna of Section II, with h 1 = 0.14 mm and h 2 = 0.266 mm is selected as the optimum design to fabricate. In order to secure a steady, broadband matching performance at low THz and eliminate the fabrication challenges presented by a thin slot, the slot aperture of Section II is replaced with an open-ended waveguide aperture [19]. Its comparative advantages can be summarized as:…”

Section: Fabrication and Measurementsmentioning

confidence: 99%

“…The first r/2 rings around the feeding aperture use a smaller h value which corresponds to a higher resonant frequency, while the latter r/2 rings use a larger h value which corresponds to a lower resonant frequency. In addition, the standard subwavelength slot feeding aperture is replaced with an open ended waveguide aperture, which is easier to fabricate at low THz and achieves good matching performance [19].…”

Section: Introductionmentioning

confidence: 99%

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Broadband THz Corrugated Bull’s Eye Antennas

Kampouridou

Feresidis

2021

IEEE Access

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A 3-dB gain and input impedance bandwidth enhancement technique for THz periodically corrugated metallic antennas, also known as Bull's Eye antennas, is presented. A novel design that exploits the depth qualities of the corrugations is introduced, by employing two different depth values for two sets of indented rings. While the gain bandwidth of most single-depth planar corrugated antennas is limited, the 3-dB gain bandwidth of the proposed dual-depth design is expanded along with a high maximum gain. The simulated optimum model of 10 rings at around 300 GHz exhibits a 3-dB gain bandwidth of 8.85% with a maximum gain at broadside of 21.3 dBi. A leaky-wave analysis has been performed via a simple transcendental equation at the level of the gap openings in order to explain the antenna principle of operation. A prototype of the optimum antenna design has been fabricated and measured. The typical subwavelength slot feeding of Bull's eye corrugated antennas is substituted with an easy-to-fabricate open waveguide aperture, yielding a broadband matching performance. Measured results demonstrate a good agreement with simulations and validate the proposed antenna design.

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Section: The Dual-depth Conceptmentioning

confidence: 92%

Section: Fabrication and Measurementsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Broadband THz Corrugated Bull’s Eye Antennas

Kampouridou

Feresidis

2021

IEEE Access

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Complex shaped periodic corrugations for broadband Bull’s Eye antennas

Kampouridou

Feresidis

2021

Sci Rep

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Periodically corrugated metallic antennas have been developed in recent years from microwave to THz frequencies, due to their advantages of highly directive radiation patterns, low profile and ease of fabrication. However, the limited gain bandwidth of such antennas remains one of their inherent disadvantages. In terms of design, the majority of the existing implementations in literature utilize the standard rectangular shaped corrugated unit cell. In this paper, we propose novel complex shaped corrugated unit cells that produce a broadband performance when assembled in a periodic configuration. Two broadband prototypes are presented at the Ku frequency band that are formed of hybrid shaped corrugations. The first prototype of six periodic rings achieves, for the first time, a flat gain simulated response with a maximum value of 15.7 dBi, 1-dB gain bandwidth of 16.4%, and an extended 3-dB gain bandwidth of 19.64%. The second novel prototype of five rings achieves an enhanced 3-dB gain bandwidth of 15.2% and maximum gain of 18.1 dBi.

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