Dielectric waveguide line comprising a polytetrafluoroethylene molded article and method of manufacture

Patent metadata

Field	Value
Publication number	US-10601098-B2
Application number	US-201615552320-A
Country	US
Kind code	B2
Filing date	Mar 31, 2016
Priority date	Mar 31, 2015
Publication date	Mar 24, 2020
Grant date	Mar 24, 2020

Abstract

The present invention provides a dielectric waveguide having excellent transmission efficiency. The dielectric waveguide includes a polytetrafluoroethylene molded article that has a permittivity of 2.05 or higher at 2.45 GHz or 12 GHz, a loss tangent of 1.20×10 −4 or lower at 2.45 GHz or 12 GHz, and a hardness of 95 or higher.

First claim

The invention claimed is:

1. A dielectric waveguide comprising
a polytetrafluoroethylene molded article that has a permittivity of 2.05 or higher at 2.45 GHz or 12 GHz, a loss tangent of 1.20×10 −4 or lower at 2.45 GHz or 12 GHz, and a hardness of 95 or higher,
wherein the hardness is measured by a spring-type hardness meter (JIS-A shaped) defined in JIS K6301-1975.

2. The dielectric waveguide according to claim 1 ,
wherein the polytetrafluoroethylene molded article is obtained by heating unsintered polytetrafluoroethylene at 326° C. to 345° C. for 10 seconds to two hours.

3. The dielectric waveguide according to claim 1 , further comprising
a dielectric layer surrounding the polytetrafluoroethylene molded article, the polytetrafluoroethylene molded article functioning as a center dielectric,
wherein the dielectric layer is formed of a material that has a permittivity of 1.90 or lower at 2.45 GHz or 12 GHz and a loss tangent of 2.00×10 −4 or lower at 2.45 GHz or 12 GHz.

4. The dielectric waveguide according to claim 1 , further comprising
a conductive substrate, and
a dielectric formed of a material having a lower permittivity than the polytetrafluoroethylene molded article,
wherein the polytetrafluoroethylene molded article is disposed on the conductive substrate with the dielectric in between.

5. The dielectric waveguide according to claim 1 , further comprising
a pair of conductive plates,
wherein the polytetrafluoroethylene molded article is held between the conductive plates.

6. A method for manufacturing a dielectric waveguide, comprising the steps of:
heating an unsintered polytetrafluoroethylene molded article at 326° C. to 345° C. for 10 seconds to two hours and thereby forming a polytetrafluoroethylene molded article; and
manufacturing a dielectric waveguide using the polytetrafluoroethylene molded article,
wherein the proportion of the polytetrafluoroethylene in the polytetrafluoroethylene molded article is 99.0% by mass or higher.

7. A dielectric waveguide comprising:
a dielectric A; and
a dielectric B having a lower permittivity than the dielectric A,
the dielectric A being formed of a polytetrafluoroethylene molded article,
the dielectric waveguide having a Δε value, determined from Δε=ε A −ε B , of 0.70 or higher,
wherein ε A represents a permittivity of the dielectric A at 2.45 GHz or 12 GHz, ε B represents a permittivity of the dielectric B at 2.45 GHz or 12 GHz, and Δε represents a permittivity difference between the dielectric A and the dielectric B,
wherein the dielectric A is in contact with the dielectric B,
wherein the proportion of the polytetrafluoroethylene in the polytetrafluoroethylene molded article is 99.0% by mass or higher.

8. The dielectric waveguide according to claim 7 , which has a Δε value of 0.90 or higher.

9. The dielectric waveguide according to claim 7 ,
wherein ε A is 2.05 or higher.

10. The dielectric waveguide according to claim 7 ,
wherein the dielectric A has a loss tangent of 1.20×10 −4 or lower at 2.45 GHz or 12 GHz and a hardness of 95 or higher,
wherein the hardness is measured by a spring-type hardness meter (JIS-A shaped) defined in JIS K6301-1975.

Assignees

• Daikin Ind Ltd

Inventors

• Yoshimoto Hiroyuki
• Murayama Kyouhei
• Yamanaka Taku
• Fukami Dai

Classifications

• H01P3/165

  Non-radiating dielectric waveguides · CPC title

• H01P11/00

  Apparatus or processes specially adapted for manufacturing waveguides or resonators, lines, or other devices of the waveguide type · CPC title

• H01P11/006 Primary

  Manufacturing dielectric waveguides · CPC title

• C08J2327/18

  Homopolymers or copolymers of tetrafluoroethylene · CPC title

• G01R27/26

  Measuring inductance or capacitance; Measuring quality factor, e.g. by using the resonance method; Measuring loss factor; Measuring dielectric constants {; Measuring impedance or related variables} · CPC title