A slot-line for a microwave device in which is mounted at least one diode connected in parallel between two metallic strips of the slot. At high frequencies (18 to 200 GHz), the inductance L of the diode connections presents a not-negligible impedance which makes it difficult to use the diode. The device in accordance with the invention comprises a slot-line reentrant circuit which provides compensation for the diode inductance and is constituted by a metallic section which is coplanar with the line and connected in series with the diode. The compensating section is short-circuited or open-circuited with respect to the metallic strip in which it is reentrant. The electrical length of the compensating section is adjustable by means of wire, conductive varnish or metal pads.

Slot-line switching and limiting device for operation at microwave frequencies

A dielectric filter (Fig.16) for frequencies higher than VHF band comprising a closed conductive housing (112), a pair of input and output means provided at both the extreme ends of said housing (112), a dielectric body (111) wwith a plurality of linear parallel grooves (118) arranged in said housing (112), a plurality of conductive linear means (113) with the length of approximately 1/4 wavelength mounted in said dielectric body (111) between said grooves (118) so that one end of said resonators (113) is fixed to the common plane of the housing (112), a capacitor means (114, 115) provided between the other end of resonators (111, 113, 118) and said conductive housing (112) so that an electrode (115) of said capacitor may be trimmed by a laser beam to adjust the resonating frequency of each of said resonators (111, 113, 118) and a plurality of conductive rods (137) provided in said grooves (118) for improving the spurious characteristics of the filter.

A dielectric filter

L'invention concerne un dispositif hyperfrequences utilisant une ligne a fente (4), dans lequel est montee au moins une diode (7) connectee en parallele entre les deux bandes (2, 3) metalliques de la fente. The invention relates to a microwave device using a slot line (4), in which is mounted at least one diode (7) connected in parallel between the two strips (2, 3) metal of the slot. A haute frequence (18 a 200 GHz), les connexions de la diode (7) presentent une self L dont l'impedance non negligeable rend difficile l'utilisation de la diode (7). At high frequency (18-200 GHz), the connections of the diode (7) have a self inductance L whose non negligible impedance makes the use of the diode (7). Le dispositif selon l'invention comprend un circuit de compensation de la self de la diode, reentrant dans la ligne a fente, constitue par un troncon metallique (9), coplanaire avec la ligne, connecte en serie avec la diode (7). The device of the invention includes a choke diode compensation circuit, re-entering the slot line, constituted by a metal section (9) coplanar with the line, connected in series with the diode (7). Le troncon de compensation est en court-circuit (9) ou en circuit ouvert (13) par rapport a la bande (3) metallique dans laquelle il est reentrant. The compensation section is short-circuit (9) or open circuit (13) relative to the web (3) metal in which it is reentrant. La longueur electnque (1) du troncon de compensation est reglable par fil (C, C', C"), par vernis conducteur, ou par plots metalliques (14, 151. Electnque the length (1) of the compensating section is adjustable wire (C, C ', C ") by conductive lacquer or by metal studs (14, 151. Application aux interrupteurs commandes. Application to the controlled switches. commutateurs et limiteurs passifs, entre 18 et 200 GHz. switches and passive limiter, between 18 and 200 GHz.

Microwave fin-line switch and limiter

The circuit under test (MO) is driven by a generator (G) via an adjustable attenuator (DG2) and a two-way directional coupler (K3). To simulate variable loading, part of the generator output is taken from a power divider (LT) through an adjustable phase shifter (PS), attenuator (DG1), amplifier (V) and wavelength-selective coupler (K1) to the output of the circuit under test. The couplers are connected to e.g. a vector network analyser (AE1). ADVANTAGE - S-parameters are measured reliably with electronically controllable device which can be coupled to high-power load impedance and requires no mechanical parts susceptible to wear.

Scattering parameter determination of nonlinear HF power amplifier - determining forward and backward wave components of wavelength-selective directional coupler at output of tested circuit

Dispositif de commutation et de limitation a ligne a fente, fonctionnant en hyperfrequences

Introduction of a minimum redundancy into a microstrip stub for microwave circuits allowing reversibility of adjustment, always operating in the same manner, that is by only removing or by only adding conductive material.

Antonio Scudellari

Papers

Stub for matching microstrip circuits