Quarter-wave matching of waveguide-to-finline transitions
Abstract
This paper presents closed-form expressions for the design of a quarter-wave transition-matching transformer. This structure takes the form of a notch or protrusion cut in the finline substrate at the waveguide-to-finline interface. The dimensions of the transformer are calculated using a homogeneous waveguide model for the partially loaded sections. The characteristics of this model are found with perturbation theory. Several transformers were designed and measured. A 5-dB improvement in return loss over a full waveguide band is typical.
- Publication:
-
IEEE Transactions on Microwave Theory Techniques
- Pub Date:
- December 1984
- DOI:
- Bibcode:
- 1984ITMTT..32.1645V
- Keywords:
-
- Impedance Matching;
- Integrated Circuits;
- Microwave Coupling;
- Millimeter Waves;
- Strip Transmission Lines;
- Waveguides;
- Finned Bodies;
- Frequency Response;
- Metal Strips;
- Planar Structures;
- Printed Circuits;
- Transformers;
- Transmission Loss;
- Electronics and Electrical Engineering