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US 5,329,263 AGranted
Directional coupler wherein thickness of coupling lines is smaller than the shik depth
AssigneeMurata Manufacturing Co., Ltd.
InventorKazuaki Minami
Life of this patent
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Abstract
An electric coupler has a dielectric substrate and a mutually parallel pair of quarter-wavelength coupling lines made of microstrip lines, formed on the top surface of the substrate separated from each other by a predetermined distance. The thickness of these coupling lines are smaller than the skin depth at a frequency at which the coupler can function as a directional coupler.
Claims20
An electric coupler comprising:
- a dielectric substrate having a top surface;
- a grounding conductor covering a bottom surface of said substrate;
- and
- a mutually parallel pair of coupling lines less than a quarter-wavelength long made of microstrip lines formed on said top surface, said coupling lines being separated from each other by a predetermined distance, said coupling lines being of thickness smaller than the skin depth thereof associated with classical skin effect corresponding to a working frequency at which said electric coupler can function as a directional coupler.
1 more element
An electric coupler comprising:
- a dielectric substrate having an even top surface;
- a grounding conductor covering a bottom surface of said substrate;
- and
- a mutually parallel pair of coupling lines less than a quarter-wavelength long made of microstrip lines formed on said top surface, said coupling lines being separated from each other by a predetermined distance, said coupling lines being of thickness smaller than the skin depth thereof associated with classical skin effect corresponding to a working frequency at which said electric coupler can function as a directional coupler.
1 more element
Dependencies are inferred from the claim text.