Microstrip line and microwave device using the same
AssigneeMatsushita Electric Industrial Co., Ltd.
InventorsRyuichi Kamimoto, Hirokazu Kitamura, Kazuyuki Kirimura, Yasuhiro Hibino
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Abstract
The present invention provides a low cost microstrip line with low loss and a microwave device using the microstrip line. The microstrip line comprises (a) a dielectric substrate for general purpose use with relatively high loss in a microwave frequency, (b) a strip conductor foil disposed on the front surface of the substrate, (c) a metal plate for grounding disposed in contact with the back of the dielectric substrate, and (d) an air layer formed on a portion of the metal plate for grounding, the portion facing to the strip conductor foil.
Claims16
A microstrip line comprising:
- a dielectric substrate which has a relative dielectric constant of 1 or more;
- a strip conductor which is disposed above said dielectric substrate, wherein a microwave signal propagates along said strip conductor;
- a metal plate for grounding which is disposed below dielectric substrate and which has a groove facing toward said strip conductor;
- and
- a conductive foil for grounding which is disposed between said metal plate and said dielectric substrate.
A microwave device comprising:
- (a) an input terminal into which a microwave signal is input;
- (b) a microstrip line which is coupled to said input terminal, said microstrip line comprising:
- (b-1) a dielectric substrate which has a relative dielectric constant of 1 or more;
- (b-2) a strip conductor which is disposed above said dielectric substrate, wherein a microwave signal propagates along said strip conductor;
- (b-3) a metal plate for grounding which is disposed below said dielectric substrate and which has a groove whose position is facing toward said strip conductor;
- and
- (b-4) a conductive foil for grounding which is disposed between said metal plate and said dielectric substrate;
- (c) an impedance matching circuit which is coupled to an output port of said microstrip line;
- (d) a low noise amplifier which is coupled to an output port of said impedance matching circuit;
- and
- (e) an output terminal which is coupled to an output port of said low noise amplifier.
A microwave device comprising:
- (a) a waveguide into which a microwave signal is input;
- (b) a waveguide probe which takes a microwave signal out of said waveguide;
- (c) a microstrip line which is coupled to said waveguide probe, said microstrip line comprising:
- (c-1) a dielectric substrate which has a relative dielectric constant of 1 or more;
- (c-2) a strip conductor which is disposed on a face of said dielectric substrate, wherein a microwave signal propagates along said strip conductor;
- (c-3) a metal plate for grounding which is disposed in contact with a back of said dielectric substrate and which has groove whose position is facing to said strip conductor;
- and
- (c-4) a conductive foil for grounding which is disposed between said metal plate and said dielectric substrate;
- (d) an impedance matching circuit which is coupled to an output port of said microstrip line;
- (e) a low noise amplifier whose input port is coupled to an output port of said impedance matching circuit;
- and
- (f) an output terminal which is coupled to an output port of said low noise amplifier.
Dependencies are inferred from the claim text.