Wave transmission lines and networks – Plural channel systems – Having branched circuits
Patent
1987-05-28
1990-01-02
LaRoche, Eugene R.
Wave transmission lines and networks
Plural channel systems
Having branched circuits
343830, 343863, 343753, 343911R, 333 21R, 333 21A, 333 26, 333 33, 333 34, 333 35, 333125, 333128, 333123, 333136, H01P 100, H01P 300, H01P 500, H01P 520
Patent
active
048916145
ABSTRACT:
The invention relates to matching asymmetrical discontinuites in transmission lines to give low reflection coefficients (less than five percent) over a wide frequency band (corresponding to at least an octave in wavelength). A group of asymmetrical discontinuites, such as impedance steps in a waveguide, are matched by considering a reference plane whose position varies with frequency at which the reflection coefficient for waves transmitted in one direction is equal to that for waves transmitted in the opposite direction. Matching elements are then provided which have a reflection coefficient at the reference plane which is equal and opposite to the reflection coefficient of the discontinuities. Matching is less difficult if the distance between the steps is less than a quarter of a guide wavelength at all frequencies in the wide band mentioned above and such an arrangement is a "reduced quarterwave transformer". The technique of using the reference plane can also be applied to a single impedance step where two matching elements on either side of the step are required. The invention has application to, for example, waveguide transitions (including coaxial to waveguide transitions), waveguide twists, waveguide tees, symmetrical waveguide five ports, planar transmission lines, optical transmission lines and dielectric lenses.
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LaRoche Eugene R.
Lee Benny T.
National Research Development Corporation
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