Multilayer transmission line using ground metal with slit, and hybrid using the transmission line
AssigneeNippon Telegraph and Telephone Corporation
InventorsKenjiro Nishikawa, Ichihiko Toyoda, Tsuneo Tokumitsu, Kenji Kamogawa
Life of this patent
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Abstract
A hybrid including a substrate, a first dielectric layer, a ground metal, and a second dielectric layer, which are stacked in this order. Transmission lines are formed below and above the ground metal, and a slit is formed in the ground metal at a position corresponding to projection of the transmission lines onto the ground metal. The substrate has a greater dielectric constant than the dielectric layers. This makes it possible to prevent coupling between the upper and lower transmission lines, thereby implementing a high impedance, low loss transmission lines.
Claims26
A transmission line comprising:
- a substrate;
- a first dielectric layer formed on said substrate;
- a ground metal formed on said first dielectric layer;
- a second dielectric layer formed on said ground metal;
- a first transmission line formed between said substrate and said first dielectric layer;
- a second transmission line formed on said second dielectric layer;
- and
- a slit formed in said ground metal,
- wherein said substrate has a greater dielectric constant than said first dielectric layer.
A Wilkinson divider including two or more quarter-wavelength transmission lines, said Wilkinson divider comprising:
- a substrate;
- a first dielectric layer formed on said substrate;
- a ground metal formed on said first dielectric layer;
- a second dielectric layer formed on said ground metal;
- a first transmission line formed between said substrate and said first dielectric layer;
- a second transmission line formed on said second dielectric layer;
- and
- a slit formed in said ground metal,
- wherein said substrate has a greater dielectric constant than said first dielectric layer, and said first transmission line and said second transmission line constitute said quarter-wavelength transmission lines of said Wilkinson divider.
A 90 degree branch-line hybrid including four quarter-wavelength transmission lines connected in a loop fashion, said 90 degree branch line hybrid comprising:
- a substrate;
- a first dielectric layer formed on said substrate;
- a ground metal formed on said first dielectric layer;
- a second dielectric layer formed on said ground metal;
- a first transmission line formed between said substrate and said first dielectric layer;
- a second transmission line formed on said second dielectric layer;
- and
- a slit formed in said ground metal,
- wherein said substrate has a greater dielectric constant than said first dielectric layer, and said first transmission line and said second transmission line constitute said quarter-wavelength transmission lines of said 90 degree branch-line hybrid.
A quasi-lumped 90 degree branch-line hybrid including wavelength transmission lines connected in a loop, and capacitors connected between ground and respective connecting points of the wavelength transmission lines, said quasi-lumped 90 degree branch-line hybrid comprising:
- a substrate;
- a first dielectric layer formed on said substrate;
- a ground metal formed on said first dielectric layer;
- a second dielectric layer formed on said ground metal;
- a first transmission line formed between said substrate and said first dielectric layer;
- a second transmission line formed on said second dielectric layer;
- and
- a slit formed in said ground metal,
- wherein said substrate has a greater dielectric constant than said first dielectric layer, and said first transmission line and said second transmission line constitute said wavelength transmission lines of said quasi-lumped 90 degree branch-line hybrid.
A 180 degree rat-race hybrid including a 3/4 wavelength transmission line and three quarter-wavelength transmission lines connected in a loop, said 180 degree rat-race hybrid comprising:
- a substrate;
- a first dielectric layer formed on said substrate;
- a ground metal formed on said first dielectric layer;
- a second dielectric layer formed on said ground metal;
- a first transmission line formed between said substrate and said first dielectric layer;
- a second transmission line formed on said second dielectric layer;
- and
- a slit formed in said ground metal,
- wherein said substrate has a greater dielectric constant than said first dielectric layer, and said first transmission line and said second transmission line constitute said 3/4 wavelength transmission line and said quarter-wavelength transmission lines of said 180 degree rat-race hybrid.
A quasi-lumped 180 degree rat-race hybrid including wavelength transmission lines connected in a loop, and capacitors connected between ground and respective connecting points of the wavelength transmission lines, said 180 degree rat-race hybrid comprising:
- a substrate;
- a first dielectric layer formed on said substrate;
- a ground metal formed on said first dielectric layer;
- a second dielectric layer formed on said ground metal;
- a first transmission line formed between said substrate and said first dielectric layer;
- a second transmission line formed on said second dielectric layer;
- and
- a slit formed in said ground metal,
- wherein said substrate has a greater dielectric constant than said first dielectric layer, and said first transmission line and said second transmission line constitute said wavelength transmission lines of said quasi-lumped 180 degree rat-race hybrid.
A reverse-phase hybrid ring including a 1:-1 transformer and three quarter-wavelength transmission lines connected in a loop, said phase inverting hybrid comprising:
- a substrate;
- a first dielectric layer formed on said substrate;
- a ground metal formed on said first dielectric layer;
- a second dielectric layer formed on said ground metal;
- a first transmission line formed between said substrate and said first dielectric layer;
- a second transmission line formed on said second dielectric layer;
- and
- a slit formed in said ground metal,
- wherein said substrate has a greater dielectric constant than said first dielectric layer, and said first transmission line and said second transmission line constitute said quarter-wavelength transmission lines of said phase inverting hybrid.
A receiver including an RF amplifier, and a mixer having a divider, said divider comprising:
- a substrate;
- a first dielectric layer formed on said substrate;
- a ground metal formed on said first dielectric layer;
- a second dielectric layer formed on said ground metal;
- a first transmission line formed between said substrate and said first dielectric layer;
- a second transmission line formed on said second dielectric layer;
- and
- a slit formed in said ground metal,
- wherein said substrate has a greater dielectric constant than said first dielectric layer, and said first transmission line and said second transmission line constitute said quarter-wavelength transmission lines of said divider.
An image rejection mixer which mixes a plurality of RF signals with local signals to output IF signals, the RF signals being obtained by dividing a received RF signal by a divider including two or more quarter-wavelength transmission lines with their one ends provided with said received RF signal and the other ends each outputting said plurality of RF signals, said divider comprising:
- a substrate;
- a first dielectric layer formed on said substrate;
- a ground metal formed on said first dielectric layer;
- a second dielectric layer formed on said ground metal;
- a first transmission line formed between said substrate and said first dielectric layer;
- a second transmission line formed on said second dielectric layer;
- and
- a slit formed in said ground metal,
- wherein said substrate has a greater dielectric constant than said first dielectric layer, and said first transmission line and said second transmission line constitute said quarter-wavelength transmission lines of said divider.
Dependencies are inferred from the claim text.