Electronic tuning circuit having image trapping element

Details Electronic tuning circuit having image trapping element Electronic tuning circuit having image trapping element

1979-02-14

1980-07-22

Smith, Alfred E.

Tuners

With resonant line elements

With lumped capacitor in tuned circuit

334 41, 333 12, H03J 300, H03J 500

Patent

active

042142172

ABSTRACT:
A tuning circuit comprises a pair of identical resonant circuits each including a transmission line and a capacitive element, a coupling circuit associated with each transmission line to inject microwave energy into the resonant circuits and extract the tuned energy therefrom. An image trapping circuit is included which comprises a first section which intersects one of the transmission lines and connected to the coupling circuit associated with the intersected transmission line and a second section which extends from the point of connection of the first section with that coupling element to the opposite transmission line in a direction skewed relative to each transmission line. The second section of the image trap circuit provides a smooth interstage coupling between the two transmission lines over a range of resonant frequencies.

REFERENCES:
patent: 3569850 (1971-03-01), Wegener et al.

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