Enhanced coplanar waveguide and optical communication module using the same
First Claim
1. A coplanar waveguide comprising:
- a dielectric substrate;
a conductive strip supported by the dielectric substrate and having a bent portion bent at an arbitrary angle and a first opening formed inside the bent portion;
a first ground strip supported by the dielectric substrate, located inside the conductive strip and having a second opening formed opposite to the first opening; and
a second ground strip supported by the dielectric substrate and located outside the conductive strip.
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Abstract
Provided are an enhanced structure of a coplanar waveguide that is a kind of transmission line used for optical communication for radio frequency (RF), and an optical communication module employing the same. While having a basic structure including a conductive strip and ground strips at both sides of the conductive strip on a dielectric substrate, the coplanar waveguide has the structure in which metal patterns of a portion of the conductive strip located around points where an RF propagation direction is changed and of a portion of an inside ground strip are removed to make electrical lengths of an outside ground strip and the inside ground strip similar each other. Using the coplanar waveguide, it is possible to fabricate an optical module that has an optimized RF characteristic and also can freely change an RF propagation direction of several tens GHz, without an additional process.
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Citations
11 Claims
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1. A coplanar waveguide comprising:
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a dielectric substrate;
a conductive strip supported by the dielectric substrate and having a bent portion bent at an arbitrary angle and a first opening formed inside the bent portion;
a first ground strip supported by the dielectric substrate, located inside the conductive strip and having a second opening formed opposite to the first opening; and
a second ground strip supported by the dielectric substrate and located outside the conductive strip. - View Dependent Claims (2, 3, 4, 5, 6)
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7. An optical communication module comprising:
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a module package;
an optical device mounted on the module package; and
a radio frequency (RF) transmission line transmitting an RF signal traveling from the inside or outside of the module package to the optical device, wherein the RF transmission line has a coplanar waveguide including;
a dielectric substrate;
a conductive strip supported by the dielectric substrate and having a bent portion bent at an arbitrary angle and a first opening formed inside the bent portion;
a first ground strip supported by the dielectric substrate, located inside the conductive strip and having a second opening formed opposite to the first opening; and
a second ground strip supported by the dielectric substrate and located outside the conductive strip. - View Dependent Claims (8, 9, 10, 11)
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Specification