Centre National De La Recherche Scientifique

Thomson-csf

Alcatel

Tekelec Airtronic

Pierre Guillon

Alain Bert

Serge Verdeyme

Narguise Mamodaly

Gerard E Forterre

Sandra Gendraud

Luis Bermudez

Yves Garault

Amarpal S Khanna

A filter device including a metal cavity (,) closed by two end walls (,) extending transversely relative to the axis of said cavity (,) and at least two dielectric inserts (,to,) defining a resonator (,) in said cavity, characterized in that it includes at least one coupling iris (,) which also extends transversely relative to said axis.

Filtering device with metal cavity provided with dielectric inserts

A dielectric resonator has a pattern of metallic micro-wave strips deposited onto a dielectric substrate having a high relative permittivity. The pattern is of a generally annular shape and has a slot formed in the annular pattern. The resonator includes an positive feedback circuit coupled thereto having an active element, such as a transistor, and is usable, for instance, as a band-cut off or band-pass filter.

Microstrip line resonator with a feedback circuit

A microwave resonator for operation in the whispering-gallery mode is constituted by a resonant element included in a flat disk having a diameter (2a) which is considerably larger than its thickness (2d). An electromagnetic wave which propagates within the disk is confined between the periphery of this latter and a so-called caustic surface having a smaller radius (a.sub.c). The wave does not radiate to the exterior and the resonator can be placed on a dielectric or metallic substrate. The disk can be hollowed-out within the caustic surface. A resonator can be simulated within the thickness of a dielectric substrate by at least one metallic ring which forms a magnetic short-circuit with the ground plane. Excitation is produced by microstrips or by dielectric image waveguides.

Microwave resonator for operation in the whispering-gallery mode

The microwave oscillator, including a transistor (1), e.g. a field-effect transistor, includes a first resonating circuit (2) connected to a first terminal and a second resonating circuit (3) connected to a second terminal of said transistor, each resonating circuit including a microstrip (4,6), to which is coupled a dielectric resonator 5,7, both resonators of both resonating circuits being similar and operating at the same resonating frequency, third terminal of said transistor defining a power output. The oscillator provides two outputs of lower power but with a high Q.sub.ext, and an output of higher power with a medium Q.sub.ext.

Transistor microwave oscillators

Growing community of inventors

Limoges, France

Pierre Guillon