End-on transmission line-to-waveguide transition

Details End-on transmission line-to-waveguide transition End-on transmission line-to-waveguide transition

1994-09-29

1997-02-04

Lee, Benny T.

Wave transmission lines and networks

Coupling networks

Balanced to unbalanced circuits

333 33, H01P 5107

Patent

active

056002866

ABSTRACT:
A transmission line-to-waveguide transition that includes a microstrip impedance transformer for matching the impedance of an input transmission line to that of a flared slotline is disclosed. The slotline's width is sufficiently small such that when the transition is inserted into a waveguide the slotline is spaced inward from the waveguide's inner walls. A balun bi-directionally couples the unbalanced signal on the microstrip to a balanced signal on the slotline. The signal propagates along the slotline and is capacitively coupled to the waveguide. A trimmable tuning stub is used to adjust the resonant frequency of a parasitic cavity formed between the transition and the waveguide to increase the transition's effective bandwidth. A tapered dielectric insert is positioned inside the waveguide to decrease its size and to improve the coupling efficiency of the transition.

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Deshpande, "Analysis of an End Launcher for an X-Band Rectangular Waveguide", IEEE Transactions on Microwave Theory and Techniques, vol. MTT-27, No. 8, Aug. 1979, pp. 731-735.
Ponchak, "A New Model for Br9oadband Waveguide-to-Microstrip Transition Design", Microwave Journal, May 1988, pp. 333-343.
Bawer, "A Printed Circuit Balun for Use with Spiral Antennas", IRE Transactions on Microwave Theory and Techniques, May 1960, pp. 319-325.

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