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US 6,556,099 B2Granted
Multilayered tapered transmission line, device and method for making the same
AssigneeMotorola, Inc.
InventorsAndrew Merritt Khan, Shamik Mukherjee, Richard S. Bickham, Lawrence F. Cygan
Life of this patent
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Abstract
A multilayer ceramic device (100) includes a plurality of dielectric layers (104A-G) separated by ground planes (114) and includes a plurality transmission line segments (118) in generally folded configuration for defining a tapered transmission line (102). The profile of the transmission line may vary and includes such profiles as embodied in the depicted lines (200, 206, 212).
Claims17
A tapered transmission line ceramic device, comprising:
- a first ground layer;
- a first dielectric layer over at least a portion of said first ground layer;
- a first tapered portion of a tapered transmission line on said first dielectric layer, said first tapered portion tapering from a first width to a second width less than said first width;
- a second dielectric layer over said first tapered portion;
- a second ground layer over at least a portion of said second dielectric layer;
- a third dielectric layer over at least a portion of said second ground layer;
- a second tapered portion of another tapered transmission line on said third dielectric layer, said second tapered portion tapering from a third width to a fourth width less than said third width, said third width substantially approximating the characteristic impedance resulting from said second width;
- and
- a structure in spaced relationship to each of said ground layers for signally connecting said first tapered portion to said second tapered portion.
6 more elements
A radio frequency signal communication system, comprising:
- (a) a first lumped element matching network;
- (b) a first impedance transformer device in signaling communication with the first lumped element matching network and exhibiting characteristics of a tapered transmission line device, said device exhibiting a Return Loss representing an acceptable impedance transformation over the frequency ranges from 800 MHz to 915 MHz and 1700 MHz to 2100 MHz when terminated with a selected impedance;
- and
- c) wherein said transformer device includes a first ground layer;
- a first dielectric layer over at least a portion of said first ground layer;
- a first tapered portion of a tapered transmission line on said first dielectric layer, said first tapered portion tapering from a first width to a second width less than said first width;
- a second dielectric layer over said first tapered portion;
- a second ground layer over at least a portion of said second dielectric layer;
- a third dielectric layer over at least a portion of said second ground layer;
- a second tapered portion of another tapered transmission line on said third dielectric layer, said second tapered portion tapering from a third width to a fourth width less than said third width, said third width substantially approximating the characteristic impedance resulting from said second width;
- and
- a structure for signally connecting said first tapered portion to said second tapered portion.
9 more elements
A method for making a multilayer tapered transmission line device, comprising the steps of:
- a) providing a first dielectric layer having first and second opposed sides;
- b) placing a first ground plane on said first side of said dielectric layer;
- c) forming a first transmission line segment on said second side of said dielectric layer;
- d) forming a second dielectric layer on said first transmission line segment;
- e) forming a second ground plane on said second dielectric layer;
- f) forming a third dielectric layer on said second ground plane;
- g) forming a second transmission line segment on said third dielectric layer;
- h) said second transmission line segment being tapered relative to said first transmission line segment and exhibiting a reduction in width relative to said first transmission line segment;
- i) conductively connecting said first and second transmission line segments;
- and
- j) electrically isolating said ground planes relative to said transmission line segments.
8 more elements
Dependencies are inferred from the claim text.