MICROSTRIP LINE/SLOT LINE TRANSITION CIRCUIT

摘要

The invention relates to a circuit for transition from a microstrip line to a slot line. According to the invention, the slot line of the transition circuit is equipped with a filter for providing on the slot line, at the crossover zone of the microstrip line and the slot line, an impedance substantially equal to the impedance of an open circuit for at least one desired frequency of the signal and an impedance substantially equal to the impedance of a short circuit for at least one undesirable frequency of the signal. Advantageously, the microstrip line is also equipped with a filter for providing on the microstrip line, at the crossover zone, an impedance substantially equal to the impedance of a short circuit for the desired frequency and an impedance substantially equal to the open-circuit impedance for the undesirable frequency.

主权项

1. Circuit for transition from a microstrip line to a slot line comprising:
a substrate equipped with a ground plane, a microstrip line implemented on said substrate at a predetermined distance from the ground plane and extending from a first input/output port, and a slot implemented in the ground plane forming a slot line extending substantially perpendicularly to said microstrip line as far as a second input/output port and crossing said microstrip line in a so-called coupling zone of the transition circuit, said microstrip line comprising a first microstrip line portion for transmitting a signal between the first input/output port and the coupling zone, and a second microstrip line portion, said slot line comprising a first slot line portion for transmitting said signal between the coupling zone and the second input/output port, and a second slot line portion, wherein the slot line comprises a first filtering circuit connected to the coupling zone via said second slot line portion, said first filtering circuit and said second slot line portion being impedance-matched to provide on the slot line, at the coupling zone, an impedance substantially equal to the impedance of an open circuit for at least one desired frequency of the signal and an impedance substantially equal to the impedance of a short circuit for at least one undesirable frequency of the signal.