Composite material for dielectric lens antennas

• US 5,154,973 A
• Filed: 12/04/1990
• Issued: 10/13/1992
• Est. Priority Date: 12/07/1989
• Status: Expired due to Term

• Current Assignee: Murata Manufacturing Co Limited
• Original Assignee: Murata Manufacturing Co Limited
• Inventors: Nagakubo, Hiroshi, Harada, Jun, Yamada, Hideaki, Kawabata, Kazunari, Imagawa, Shunjiro
• Primary Examiner(s): BUFFALOW, EDITH
• Application Number:
  US07/624,717
• Time in Patent Office: 679 Days
• Field of Search: 428/325, 428/327, 428/402, 428/411.1, 428/412, 428/413, 428/423.1, 428/447, 428/480, 428/500, 428/521, 428/524
• US Class Current: 428/325
• CPC Class Codes: H01Q 15/08 formed of solid dielectric material
• CPC Class Codes: H01Q 19/06 using refracting or diffracting devices, e.g. lens radome H01Q1/42
• CPC Class Codes: Y10T 428/252 Glass or ceramic [i.e., fired or glazed clay, cement, etc.] [porcelain, quartz, etc.]
• CPC Class Codes: Y10T 428/2982 Particulate matter [e.g., sphere, flake, etc.]
• CPC Class Codes: Y10T 428/31504 Composite [nonstructural laminate]
• CPC Class Codes: Y10T 428/31507 Of polycarbonate
• CPC Class Codes: Y10T 428/31511 Of epoxy ether
• CPC Class Codes: Y10T 428/31551 Of polyamidoester [polyurethane, polyisocyanate, polycarbamate, etc.]
• CPC Class Codes: Y10T 428/31663 As siloxane, silicone or silane
• CPC Class Codes: Y10T 428/31786 Of polyester [e.g., alkyd, etc.]
• CPC Class Codes: Y10T 428/31855 Of addition polymer from unsaturated monomers
• CPC Class Codes: Y10T 428/31931 Polyene monomer-containing
• CPC Class Codes: Y10T 428/31942 Of aldehyde or ketone condensation product

Abstract

This invention is to provide a composite material for dielectric lens antennas which contains 3-70 percent by volume of a high dielectric constant ceramic and 30-97 percent by volume of a macromolecular material. At this time it is desirable that the mean particle diameter of the high dielectric constant ceramic is 1-50 μm. It is also preferable that the macromolecular material is a thermoplastic macromolecular material. A dielectric lens is made of this composite material for the dielectric lens antennas. Further, the dielectric lens antenna is preferably produced forming a matching layer on the dielectric lens surface.

Claims

1. A dielectric lens antenna composite material containing 3-70 percent by volume of a high dielectric constant ceramic and 30-97 percent by volume of a thermoplastic ;

macromolecular resin material.

2. A dielectric lens antenna composite material according to claim 1, wherein a mean particle diameter of said high dielectric constant ceramic is 1-50 μ

m.

3. A dielectric lens antenna composite material according to claim 1, wherein a mechanical quality factor of said thermoplastic macromolecular material is more than 150.

4. A dielectric lens antenna formed by injection-molding a composite material containing 3-70 percent by volume of a high dielectric constant ceramic and 30-97 percent by volume of a thermoplastic macromolecular resin material.

5. A dielectric lens antenna according to claim 4, wherein a mean particle diameter of said high dielectric constant ceramic is 1-50 μ

m.

6. A dielectric lens antenna according to claim 4, wherein a mechanical quality factor of said thermoplastic macromolecular resin material is more than 150.

7. A method of making a dielectric lens antenna comprising the steps of:

providing a mold having a predetermined shape for forming a dielectric lens antenna;

injecting a composite material containing 3-70 percent by volume of a high dielectric constant ceramic and 30-97 percent by volume of a thermoplastic macromolecular resin material into said mold so as to injection-mold said dielectric lens antenna.

8. A dielectric lens antenna according to claim 7, wherein a mean particle diameter of said high dielectric constant ceramic is 1-50 μ

m.

9. A dielectric lens antenna according to claim 7, wherein a mechanical quality factor of said thermoplastic macromolecular resin material is more than 150.