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Inverted coplanar waveguide coupler with integrated microstrip connection ports

A microstrip and coupler technology, applied in the field of signal couplers, can solve the problems of occupying the space of the circuit board and increasing the complexity of the circuit structure, etc.

Inactive Publication Date: 2004-09-29
CREE INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This increases the complexity of the circuit structure and takes up additional board space

Method used

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  • Inverted coplanar waveguide coupler with integrated microstrip connection ports
  • Inverted coplanar waveguide coupler with integrated microstrip connection ports
  • Inverted coplanar waveguide coupler with integrated microstrip connection ports

Examples

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Embodiment Construction

[0012] FIG. 1 is a functional block diagram of a microwave circuit, in which the input signal is provided to the phase quadrature balanced amplifiers 54 and 56 via the coupler 12 at the reference numeral 10, and the amplified output of the amplifier is provided to the output terminal 20 via the coupler 18. Generally, the input line 10 and the output line 20 are microwave transmission belts, which include metal traces on the opposite surface of the substrate on one surface of the substrate on the grounded metal layer, and the couplers 12, 18 are Coplanar metal traces. U.S. Patent No. 5,629,654 to Frick discloses an input and output microwave transmission belt with coplanar couplers 12 formed on one surface of the printed circuit of the substrate. As mentioned above, this structure cannot save cost and space.

[0013] According to the present invention, the input and output lines of the microwave transmission belt are arranged on one surface of the substrate and the coplanar coupler...

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Abstract

A coplanar coupler (14) for use with microstrip input and output ports includes a printed circuit substrate in which first and second metal input ports are formed on a top surface and cooperate with a metal layer on the bottom surface as microstrip lines, and first and second metal output ports formed on the top surface which cooperate with the metal layer on the bottom surface as microstrip lines. The metal layer (24) on the bottom surface functions as a ground plane for the input ports and the output ports, the metal layer being removed in a coupler region underlying at least portions of the metal input and output ports and extending therebetween. First and second metal lines (31,32) are formed on the bottom surface in the coupler region and function as a coplanar coupler for the input and output ports. Electrical vias in the substrate interconnect the ports and the coplanar coupler.

Description

Background of the invention [0001] The present invention generally relates to microwave circuits, and in particular, the present invention relates to a signal coupler for microwave circuits. Microwave circuits usually use signal couplers between circuit parts. A variety of coupler structures have been used in the past, including microwave transmission strip coupling lines, stripline coupling lines, and coplanar waveguide coupling lines. The most common form of microwave circuits is a microwave transmission line. For example, a microwave transmission band coupler such as a Lange coupler is difficult to be manufactured on-line on a printed circuit board with limited resolution and space. This is especially true when a higher coupling value of the order of -3dB (that is, half of the incoming energy) is required. It has been confirmed before that the coplanar waveguide coupler can meet the requirements of high coupling value while only requiring medium resolution of the line width and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01P1/00H01P5/08H01P5/18H05K1/02
CPCH05K1/0237H01P5/186H01P5/18
Inventor E·J·小克雷斯岑兹
Owner CREE INC