Internal admittance elements of a rectangular waveguide longitudinal slot using the image method

Kakatkar, S. S.; Deshmukh, Amit A.; Ray, K. P.

doi:10.1080/02726343.2019.1619230

Cited by 3 publications

(18 citation statements)

References 25 publications

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“…The electric field has been assumed to be equiphase over the slot and has no component along the ζ direction. Proceeding as per the MoM formulation [2,12,19], the geometry has been divided into three regions: one internal to the waveguide, second within the wall thickness region of the slot that is also a small section of a waveguide cavity with cross-section 2L × W , and third, the free space region external to the slot. The unknown electric field E i(e) within the slot aperture at the internal (external) interface is expanded in P global sinusoidal basis functions with coefficients e i(e) .…”

Section: Theorymentioning

confidence: 99%

“…Recently, the longitudinal slot in a waveguide has been analysed by using the equivalent image representation which replaces the original slot in a waveguide with infinite images of the slot in the homogeneous medium filling the waveguide (free space for air filled waveguides). These images are formed due to successive reflections in the perfectly conducting waveguide walls [15][16][17][18][19]. The magnetic field at the reference slot is then due to the mutual admittance from all the image slots.…”

Section: Theorymentioning

confidence: 99%

“…(8). The mutual admittance has been evaluated using the more accurate single dipole approximation or double dipole approximation (for co-planar slots) [19,20] for images with centre-centre separation of R mn satisfying the criteria [19] (…”

Section: Theorymentioning

confidence: 99%

“…Recently, the internal admittance of a longitudinal slot has been evaluated by replacing the waveguide fed slot with its images formed due to reflections from the perfectly conducting waveguide walls, leading to an equivalent 2D infinite array of slots [15][16][17][18][19]. The magnetic field at the reference slot due to all the magnetic current images has been evaluated by adding the mutual admittances due to all the image currents.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Analysis of a Rectangular Waveguide Fed Compound Slot by Image Method

Kakatkar¹,

Deshmukh²,

Ray³

2020

PIER M

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A compound or an offset inclined slot fed by a rectangular waveguide has been analysed using the image method for the evaluation of internal admittance in the Method of Moments framework. The internal admittance has been evaluated from the 2D infinite planar array equivalent image representation of a slot in a waveguide. The advantages offered by this method include the freedom to work in slot coordinates rather than the waveguide coordinates, the reuse of external admittance for air filled waveguides, and the flexibility in the choice of the mutual admittance evaluation technique. Unlike the conventional mode method, the proposed technique does not run into difficulties while evaluating the fields from longitudinal magnetic current for points in the same transverse plane. The θ-algorithm has been used for the convergence acceleration of the series of mutual admittances in the internal admittance evaluation and has been shown to yield better results than other convergence acceleration algorithms investigated. The results obtained from this method have been shown to agree within 0.5% average with those from other theoretical techniques and within 1% average with measurements. The proposed method is useful in the design of compound slot arrays and can be extended to other configurations where the image representation is possible and for various slot aperture distributions.

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Section: Theorymentioning

confidence: 99%

Section: Theorymentioning

confidence: 99%

Section: Theorymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Analysis of a Rectangular Waveguide Fed Compound Slot by Image Method

Kakatkar¹,

Deshmukh²,

Ray³

2020

PIER M

Self Cite

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“…Slot array antennas typically have the advantage of high directivity, low power loss, high power handling capacity, low attenuation and immunity against any RF interference inside the waveguide. The basic theory of slots has been well explained and the analysis of longitudinal slots has been presented in [1][2][3][4][5][6]. An excellent review of waveguide fed slot antennas is available in [7][8].…”

Section: Introductionmentioning

confidence: 99%

Triangular Waveguide Fed Slot Antenna

Prajapati¹,

Kakatkar²,

Nalbalwar³

2019

International Journal of Advanced Research in Computer and Comm

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Limited literature is available on triangular waveguides and triangular waveguide fed slot antennas, as compared to their rectangular and circular waveguide counterparts. In this paper, simulated and measured results have been presented for a right angled isosceles triangular waveguide fed slot antenna in S band. The antenna has been simulated and then fabricated in aluminium material. Simulated and experimental results show good agreement in resonant frequency. This work can be used in the design of a triangular waveguide fed low cost slot array.

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Analysis of a rectangular waveguide transverse slot using MoM and image method

Kakatkar

Deshmukh

Ray

2020

IET Microwaves, Antennas & Propagation

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A waveguide fed transverse slot has been analysed using the Method of Moments (MoM) formulation, wherein the internal admittance matrix elements have been evaluated from image theory and using the images of the slot due to waveguide walls. The contribution from all the images not in the same row as the slot has been evaluated using a closed‐form expression and a rapidly converging series with negligible contribution. The contribution from the row containing the reference slot has been evaluated by adding the mutual admittance between a few images and the reference slot using some recently developed simple and accurate approximations. The formulation has been extended to transverse slots radiating between the baffles. The results calculated using this simple, efficient and intuitive method are in excellent agreement with other theoretical as well as measured results. The technique can be extended to other slot configurations such as an inclined slot and for other slot aperture distributions such as with an edge condition in configurations permitting image formation.

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Internal admittance elements of a rectangular waveguide longitudinal slot using the image method

Cited by 3 publications

References 25 publications

Analysis of a Rectangular Waveguide Fed Compound Slot by Image Method

Analysis of a Rectangular Waveguide Fed Compound Slot by Image Method

Triangular Waveguide Fed Slot Antenna

Analysis of a rectangular waveguide transverse slot using MoM and image method

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