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

Abstract

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.

A THz Slot Antenna Design Using Analytical Techniques

“…Slot antennas are very popular microwave antennas, and slotted waveguides are used for high frequency radar systems [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16]. A thin slot in an infinite ground plane is the complement to a dipole in free space.…”

“…The position of the slots affects the intensity of the transmitted power by directly causing the impedance matching of the antenna; good impedance matching produces the maximum efficiency of power transmission. In [15], a waveguide-fed transverse slot was analyzed using the Method of Moments (MoM) formulation, wherein the internal admittance matrix elements were evaluated from image theory and using the images of the slot from waveguide walls. The contribution from all the images not in the same row as the slot was evaluated using a closed-form expression and a rapidly converging series with negligible contribution.…”