A Slotted-Waveguide Array for High-Power Microwave Transmission

Coburn, William O.; Litz, Marc; Miletta, J.; Tesny, Neal; Dilks, Lillian; King, B. J.

doi:10.21236/ada392022

Cited by 12 publications

(14 citation statements)

References 8 publications

(16 reference statements)

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“…34 For the planar SWA, the distance separating the radiating slots between the nearest SWA branchlines is larger than half wavelength, as such the mutual coupling between the slots in different SWA branchlines is negligible. 24 In addition, some work showed that the analytical results in the case of considering the mutual coupling in the calculations of the slots excitations are very close to those resulting from CST simulation software. 40,47,48 Taking into account the mutual coupling effects, the radiation characteristics can be slightly enhanced in terms of the SLLs and return loss.…”

Section: Mutual Coupling Between the Coupling And Radiating Slotsmentioning

confidence: 67%

“…The effect of the mutual coupling on the radiation pattern and the reflection coefficient results for SWAs have been presented in several articles, for which some of them have neglected this effect, 7,9,24,[39][40][41][42][43][44][45] which is a valid assumption for resonant slotted arrays. 46 It was shown in Reference 44 that the effect of mutual coupling on the array performance is minimal.…”

Section: Mutual Coupling Between the Coupling And Radiating Slotsmentioning

confidence: 99%

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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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Section: Mutual Coupling Between the Coupling And Radiating Slotsmentioning

confidence: 67%

Section: Mutual Coupling Between the Coupling And Radiating Slotsmentioning

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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“…For this, in the next calculations the length of all slots is fixed at 54.25 mm. The displacement of the nth slot is related to its normalized conductance g n by [15,[17][18][19]:…”

Section: Non-uniform Displacement Calculation Proceduresmentioning

confidence: 99%

Design of Slotted Waveguide Antennas With Low Sidelobes for High Power Microwave Applications

Misilmani¹,

Al‐Husseini²,

Kabalan³

2015

PIER C

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Abstract-Slotted waveguide antenna (SWA) arrays offer clear advantages in terms of their design, weight, volume, power handling, directivity, and efficiency. For broadwall SWAs, the slot displacements from the wall centerline determine the antenna's sidelobe level (SLL). This paper presents a simple inventive procedure for the design of broadwall SWAs with desired SLLs. For a specified number of identical longitudinal slots and given the required SLL and operating frequency, this procedure finds the slots length, width, locations along the length of the waveguide, and displacements from the centerline. Compared to existing methods, this procedure is much simpler as it uses a uniform length for all the slots and employs closed-form equations for the calculation of the displacements. A computer program has been developed to perform the design calculations and generate the needed slots data. Illustrative examples, based on Taylor, Chebyshev and the binomial distributions are given. In these examples, elliptical slots are considered, since their rounded corners are more robust for high power applications. A prototype SWA has been fabricated and tested, and the results are in accordance with the design objectives.

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“…In wireless systems, several types of the antenna in Ku and K band have been presented, 1,2 for applications such as Doppler radar systems, 3 satellite communication, [4][5][6] and aerospace/astrospace equipment. 7 With the growing development of wireless communication systems, multifrequency antenna have been attracting more interest. 5,6 For dual Kband, band operation horn antennas and array antennas using helical exciters are suffered with integrated difficulties and high-manufacture cost.…”

Section: Introductionmentioning

confidence: 99%

Substrate integrated waveguide cavity‐backed log‐periodic slot antenna for Ku and K band applications

Navamani¹,

Swaminathan²

2018

Int J RF Microw Comput Aided Eng

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In this article, a novel substrate integrated waveguide (SIW) is used to design multifrequency cavity‐backed log‐periodic slot antenna. The proposed design has three layers of cavity‐backed structure namely feeding SIW, resonant SIW, and log‐periodic slot SIW in order to achieve low loss, high gain, and easy integration with high‐frequency components. The proposed structure also includes an inductive window slot to couple the energy from feeding SIW to resonant cavity. The experimental results shows that 10‐dB impedance bandwidth of 870 MHz (7.9%), 390 MHz (2.7%), 410 MHz (2.5%), 310 MHz (3.9%), and 420 MHz (2.2%) are obtained at resonant frequencies 11.25 GHz, 14.25 GHz, 15.95 GHz, 16.9 GHz, and 19.15 GHz, respectively. Also, a realized gain of around 18.24 dB is obtained at the bore sight direction. Moreover, the simulated and experimented results are in good agreement and make the antenna more suitable for Ku and K band applications.

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A Slotted-Waveguide Array for High-Power Microwave Transmission

Cited by 12 publications

References 8 publications

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

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

Design of Slotted Waveguide Antennas With Low Sidelobes for High Power Microwave Applications

Substrate integrated waveguide cavity‐backed log‐periodic slot antenna for Ku and K band applications

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