Microwave Breakdown in Slots

Jordan, U.; Anderson, D.; Bäckström, Mikael; Kim, A. V.; Lisak, M.; Lunden, O.

doi:10.1109/tps.2004.838594

Cited by 21 publications

(9 citation statements)

References 11 publications

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“…This improved split-horn antenna will be useful for a high-power array antenna application to be able to transmit several GW HPEM pulses through the air without the occurrence of dielectric/air breakdown. With the rapid development of wireless communication systems, planar printed quasi-Yagi antennas have drawn much attention due to their great merits of simple structure, low profile, light weight, high gain, and ease of fabrication [1][2][3][4][5][6][7][8][9][10][11]. For the bandwidth enhancement of the conventional quasi-Yagi antennas, there are mainly three kinds of approaches via the changes of the director, driver and reflector, respectively.…”

Section: Resultsmentioning

confidence: 99%

“…Besides, using the folded dipole driver can also expand the impedance bandwidth [8]. The third approach for the antenna bandwidth enhancement is that the truncated ground as the reflector was modified [4,[9][10][11]. Taking [4] for instance, two additional stubs are loaded on the ground edge to increase the electrical size of the ground plane but keep the physically overall size of the antenna.…”

Section: Resultsmentioning

confidence: 99%

“…Taking [4] for instance, two additional stubs are loaded on the ground edge to increase the electrical size of the ground plane but keep the physically overall size of the antenna. For the size miniaturization of the planar quasi-Yagi antenna, meandered structures are usually adopted under the condition of not affecting the antenna performance [9,10].…”

Section: Resultsmentioning

confidence: 99%

“…Array antenna is an alternative solution to overcome the limitations of the single large antenna because it has less volume and can be applicable to various beam operation with the same antenna gain of a single large antenna. A common form of array like slot array antenna is not suitable for radiating high power, because the energy density becomes large enough to cause breakdown in the slot and the medium surrounding the antenna and one requires hundreds or even thousands of slots to radiate several GW HPEM pulses. So a split waveguide antenna is proposed by the author to be able to radiate a high power electromagnetic field from an electrically small geometry without the occurrence of air breakdown at the aperture of the antenna.…”

Section: Introductionmentioning

confidence: 99%

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Enhanced window breakdown threshold of the split‐horn antenna using an E‐plane field shaper

Choi

Shin

2016

Micro & Optical Tech Letters

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A compact split-horn antenna with a high-power handling capability to be able to radiate high-power pulse energy through vacuum dielectric window into the free space without the occurrence of dielectric/air breakdown is proposed at S-band. To increase the threshold of dielectric/air and vacuum/dielectric breakdown, it uses the special E-plane field shaper at the edges of the split-horn aperture. The proposed split-horn antenna has a high-power handling capability of 50 MW which is five times larger than that of the conventional split-horn antenna of 10 MW for the air breakdown threshold of 30 kV cm 21 as well as a similar antenna gain and a radiation pattern.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Enhanced window breakdown threshold of the split‐horn antenna using an E‐plane field shaper

Choi

Shin

2016

Micro & Optical Tech Letters

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“…The conventional rectangular slots used in the traditional SWA design could aggravate electrical breakdown problems when working at HPMs. 31 This is due to the enhancement of the microwave electric field which can lead to self-induced microwave breakdown of the air in the slot. 32 Avoiding sharp corners is preferred in such cases.…”

Section: Slot Shape and Dimensionsmentioning

confidence: 99%

Design procedure for planar slotted waveguide antenna arrays with controllable sidelobe level ratio for high power microwave applications

Misilmani

Al‐Husseini

Kabalan

2020

Engineering Reports

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This article presents a complete design procedure for planar slotted waveguide antennas (SWA). For a desired sidelobe level ratio (SLR), the proposed method provides a pencil shape pattern with a narrow half power beamwidth, which makes the proposed system suitable for high power microwave applications. The proposed planar SWA is composed of only two layers, and uses longitudinal coupling slots rather than the conventional inclined coupling slots. For a desired SLR, the slots excitation in the radiating and feeder SWAs are calculated based on a specified distribution. Simplified closed-form equations are then used to determine the slots nonuniform displacements, for both the radiating and feeder SWAs, without the need to use optimization algorithms. Using simplified equations, the slots lengths, widths, and their distribution along the length of the radiating and feeder SWAs can be found. The feeder dimensions and slots positions are deduced from the dimensions and total number of the radiating SWAs. An 8 × 8 planar SWA has been designed and tested to show the validity of the proposed method. The obtained measured and simulated results are in accordance with the design objectives. K E Y W O R D S antenna arrays, high power microwave applications, slotted waveguide antennas, sidelobe level ratio 1 INTRODUCTION High power microwave (HPM) technology is well known in both military and commercial applications. 1 An efficient antenna to be used as the radiating system for these applications is required to have a well directive pattern, large sidelobe level ratio (SLR), and high gain. It should also have high power handling capability required to extract the HPMs from their source. Slotted waveguide antennas (SWA) 2 are taking a major interest in this field, with their major ability of beam pointing and HPM handling capability. 3 SWAs can be also directly connected to Reltron HPM sources, without the need for additional mode converter, which makes them suitable for HPM applications. SWAs are also used in wireless technologies, maritime, and space applications. SWAs are made of rectangular waveguides, having slots cuts used to radiate the energy. 4 The conventional cuts have a rectangular shape. The slots can be made either on the broadwall or the narrow wall of the waveguide, with the most This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

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Finite Volume Time Domain modelling of microwave breakdown and plasma formation in a metallic aperture

Hamiaz¹,

Klein²,

Ferrières³

et al. 2012

Computer Physics Communications

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Microwave Breakdown in Slots

Cited by 21 publications

References 11 publications

Enhanced window breakdown threshold of the split‐horn antenna using an E‐plane field shaper

Enhanced window breakdown threshold of the split‐horn antenna using an E‐plane field shaper

Design procedure for planar slotted waveguide antenna arrays with controllable sidelobe level ratio for high power microwave applications

Finite Volume Time Domain modelling of microwave breakdown and plasma formation in a metallic aperture

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