Low-loss infrared filter for microwave measurement which integrates a distributed bragg reflector into a microwave transmission line

Patent metadata

Field	Value
Publication number	US-9857509-B2
Application number	US-201514950333-A
Country	US
Kind code	B2
Filing date	Nov 24, 2015
Priority date	Sep 28, 2015
Publication date	Jan 2, 2018
Grant date	Jan 2, 2018

Abstract

A technique relates to a microwave device. A microwave system is configured to output a microwave readout signal, where the microwave system has an input and an output. An output microwave transmission line is connected to the output of the microwave system. A distributed Bragg reflector, integrated into a transmission line geometry, is configured as a low-loss infrared filter that blocks infrared radiation while allowing transmission of the microwave readout signal. The low-loss infrared filter is connected to the output microwave transmission line.

First claim

What is claimed is:

1. A method of configuring a microwave apparatus, the method comprising:
providing a microwave system configured to output a microwave readout signal, the microwave system having an input and an output;
connecting an output microwave transmission line to the output of the microwave system; and
configuring a distributed Bragg reflector, integrated into a transmission line geometry, as a low-loss infrared filter that blocks infrared radiation while allowing transmission of the microwave readout signal, the low-loss infrared filter being connected to the output microwave transmission line.

2. The method of claim 1 , wherein the distributed Bragg reflector comprises a unit cell of at least two different dielectric layers.

3. The method of claim 2 , wherein the unit cell repeats to have a total of N dielectric layers.

4. The method of claim 1 , wherein the distributed Bragg reflector comprises a first dielectric layer and a second dielectric layer adjacent to the first dielectric layer.

5. The method of claim 4 , wherein the first dielectric layer has a first dielectric constant; and
wherein the second dielectric layer has a second dielectric constant different from the first dielectric constant.

6. The method of claim 4 , wherein the first dielectric layer has a first thickness; and
wherein the second dielectric layer has a second thickness.

7. The method of claim 6 , wherein the first thickness is different from the second thickness.

8. The method of claim 4 , wherein the low-loss infrared filter has a center conductor stripline formed through the first dielectric layer and the second dielectric layer.

9. The method of claim 8 , wherein the center conductor stripline is a conductive metal;
wherein the low-loss infrared filter has an outer conductor encompassing the first dielectric layer and the second dielectric layer, the center conductor stripline extending through the outer conductor in a lengthwise direction;
wherein the low-loss infrared filter comprises a first connector and a second connector, both connected to opposite ends of the center conductor stripline in the lengthwise direction; and
wherein an outer conductor of the first and second connectors connects to the outer conductor of the low-loss infrared filter.

Assignees

• IBM
• Int Business Machiens Corporation

Inventors

• Abdo Baleegh

Classifications

• H01P11/001

  Manufacturing waveguides or transmission lines of the waveguide type · CPC title

• G02B27/4244

  in wavelength selecting devices (spectrometry G01J) · CPC title

• H01P3/085

  Triplate lines · CPC title

• G02B5/208 Primary

  for use with infrared or ultraviolet radiation, e.g. for separating visible light from infrared and/or ultraviolet radiation · CPC title

• G02B5/1861

  Reflection gratings characterised by their structure, e.g. step profile, contours of substrate or grooves, pitch variations, materials (G02B5/1809, G02B5/1828, G02B5/1833, G02B5/1838 and G02B5/1847 take precedence) · CPC title