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Analysis of a centered-inclined waveguide slot coupler

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1 Author(s)
Rengarajan, S.R. ; California Univ., Los Angeles, CA, USA

Integral equations are developed for a centered-inclined coupling slot (including the effect of finite wall-thickness of the common broad-wall) and the slot-aperture electric intensity field is found using the method of moments. Numerical results for resonant length, backscattered wave amplitude, and phase variation off-resonance are presented over a range of values of the waveguide b dimension, wall thickness, slot width, and frequency. It is shown that the resonant length is relatively insensitive to slot tilt, θ, for a standard-height X-band waveguide, whereas its dependence on θ is significant for reduced-height waveguides. The phase variation of scattered TE10 waves in both waveguides off-resonance is less for wider slots and smaller b dimensions. Shunt-series coupling slots exhibit greater phase variation off resonance when compared to a centred-inclined coupling slot. Also, the former has a longer resonant length for a smaller b dimension and for a wider slot. Thus the centred-inclined slot coupler possesses superior characteristics. The higher-order mode coupling between a centred-inclined slot coupler and a pair of straddling radiating slots in the branch waveguide is significant

Published in:

Microwave Theory and Techniques, IEEE Transactions on  (Volume:37 ,  Issue: 5 )