# US 10,483,609 B2 · Dielectric waveguide having a core and cladding formed in a flexible multi-layer substrate

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- Number: US 10,483,609 B2
- Document ID: US10483609B2
- Status: Granted
- Kind: B2
- Application number: 15/614,969
- Filed: 2017-06-06
- Published: 2017-09-21
- Granted: 2019-11-19
- Earliest claimed: 2014-04-09
- Assignees: Texas Instruments Incorporated
- Applicants: Texas Instruments Incorporated
- Inventors: Robert Floyd Payne; Gerd Schuppener; Juan Alejandro Herbsommer
- Web page: https://patentgrep.com/patent/US10483609B2

## CPC

- H01P 3/16: Dielectric waveguides, i.e. without a longitudinal conductor
- H01P 11/006: {Manufacturing dielectric waveguides}
- H01P: WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE (operating at optical frequencies G02B)

## Abstract

A digital system has a dielectric core waveguide that is formed within a multilayer substrate. The dielectric waveguide has a longitudinal dielectric core member formed in the core layer having two adjacent longitudinal sides each separated from the core layer by a corresponding slot portion formed in the core layer The dielectric core member has the first dielectric constant value. A cladding surrounds the dielectric core member formed by a top layer and the bottom layer infilling the slot portions of the core layer. The cladding has a dielectric constant value that is lower than the first dielectric constant value.

## Claims

### Claim 1

A system comprising:
a multilayer substrate having at least a core layer having a first dielectric constant value, a top layer adjacent the core layer and a bottom layer opposite adjacent the core layer, wherein the top layer and the bottom layer have a dielectric constant value that is lower than the first dielectric constant value;
a dielectric waveguide (DWG) formed within the multilayer substrate, wherein the dielectric waveguide comprises:
a longitudinal dielectric core member formed in the core layer having two adjacent longitudinal sides each separated from the core layer by a corresponding slot portion formed in the core layer, such that the dielectric core member has the first dielectric constant value; and
a cladding surrounding the dielectric core member formed by the top layer and the bottom layer infilling the corresponding slot portions of the core layer, wherein the cladding has a dielectric constant value that is lower than the first dielectric constant value.

### Claim 2 (depends on 1)

The system of claim 1, wherein the cladding is a layer formed c on the dielectric core member and extending beyond the DWG.

### Claim 3 (depends on 1)

The system of claim 1, wherein the DWG includes an antenna patterned on the multilayer substrate adjacent at an end of the longitudinal dielectric core member.

### Claim 4 (depends on 3)

The system of claim 3, further comprising an unpackaged integrated circuit die mounted directly on the multilayer substrate adjacent the end of the longitudinal dielectric core member and conductively coupled to the antenna.

### Claim 5 (depends on 1)

The system of claim 1, wherein the substrate is a rigid substrate.

### Claim 6

A method for forming a dielectric waveguide (DWG), the method comprising:
forming two parallel slots in a core layer of a substrate to define a longitudinal dielectric core member having two longitudinal sides between the two parallel slots, wherein the core layer has a first dielectric constant value; and
forming cladding layers on the dielectric core member such that the cladding layers infill the two parallel slots, wherein the cladding has a second dielectric constant value that is less than the first dielectric constant value.

### Claim 7 (depends on 6)

The method of claim 6, wherein the cladding layers extend beyond the waveguide.

### Claim 8 (depends on 6)

The method of claim 6, wherein the cladding layers extend approximately a width of the waveguide.

### Claim 9 (depends on 6)

The method of claim 6, wherein the cladding layers are formed c by three dimensional printing onto a surface of the core layer of the substrate.

### Claim 10 (depends on 6)

The method of claim 6, wherein the DWG includes an antenna c patterned on the substrate adjacent an end of the longitudinal dielectric core member.

### Claim 11 (depends on 10)

The method of claim 10, further comprising forming a reflective array of conductive vias in the core layer of the substrate adjacent the antenna.

### Claim 12 (depends on 10)

The method of claim 10, further comprising mounting an unpackaged integrated circuit die directly on the substrate adjacent the end of the longitudinal dielectric core member and conductively coupled to the antenna.

### Claim 13

An apparatus comprising:
a dielectric waveguide (DWG) formed within a multilayer substrate, wherein the dielectric waveguide comprises:
a longitudinal dielectric core member formed in a core layer having two adjacent longitudinal sides each separated from the core layer by a corresponding slot portion formed in the longitudinal dielectric core member, such that the dielectric core member has a first dielectric constant value; and
a cladding surrounding the dielectric core member formed by a top layer and a bottom layer infilling the corresponding slot portions of the core layer, wherein the cladding has a dielectric constant value that is lower than the first dielectric constant value.

### Claim 14 (depends on 13)

The apparatus of claim 13, wherein the cladding is a layer formed on the dielectric core member and extending beyond the DWG.

### Claim 15 (depends on 13)

The apparatus of claim 13, wherein the DWG includes an antenna patterned on the multilayer substrate adjacent an end of the longitudinal dielectric core member.

### Claim 16 (depends on 15)

The apparatus of claim 15, further comprising an unpackaged integrated circuit die mounted directly on the multilayer substrate adjacent the end of the longitudinal dielectric core member and conductively coupled to the antenna.

### Claim 17 (depends on 13)

The apparatus of claim 13, wherein the substrate is a rigid substrate.