Microstrip antenna with stripline and amplifier

• US 4,853,703 A
• Filed: 03/17/1987
• Issued: 08/01/1989
• Est. Priority Date: 03/17/1986
• Status: Expired due to Fees

• Current Assignee: Aisin Seiki Co., Ltd. (Aisin Corp.)
• Original Assignee: Aisin Seiki Kabushiki Kaisha
• Inventors: Murakami, Yuichi, Ieda, Kiyokazu
• Primary Examiner(s): Hille, Rolf
• Assistant Examiner(s): Wimer, Michael C.
• Application Number:
  US07/026,705
• Time in Patent Office: 868 Days
• Field of Search: 343/700 MS, 343/701, 343/846, 333/247, 455/327, 455/333, 455/325, 455/291, 455/282, 330/277, 330/1 R, 330/286
• US Class Current: 343/700.0MS
• CPC Class Codes: H01Q 1/247 with frequency mixer, e.g. for direct satellite reception or Doppler radar
• CPC Class Codes: H01Q 9/0407 Substantially flat resonant element parallel to ground plane, e.g. patch antenna dipole H01Q9/285; monopole H01Q9/40

Abstract

A high frequency amplifier is mounted in the immediate vicinity of a feeder of a microstrip antenna. A microstrip antenna includes a dielectric member and a grounded conductor member which is applied thereto. A second dielectric member is disposed on the side of the grounded conductor member which faces away from the dielectric member, and the high frequency amplifier is mounted on the surface of the second dielectric member which faces away from the grounded conductor member, and is connected to the feeder of the microstrip antenna. A transmission distance between the feeder and the high frequency amplifier, which represents an initial amplifier stage, is greatly reduced, thus drastically reducing disturbances caused by external noises and improving the noise figure of a receiving equipment.

Claims

1. An antenna device comprising:

a microstrip antenna formed on a first dielectric member, said microstrip antenna including feeder means and further including a radiating conductor member disposed on a first major surface of said first dielectric member, and a grounded conductor member disposed on an opposing major surface of said first dielectric member;

a second dielectric member disposed on an opposite side of said grounded conductor member from said first dielectric member, such that said grounded conductor member is sandwiched between first and second dielectric members; and

a high frequency circuit mounted on a surface of said second dielectric member which faces away from said grounded conductor member, said high frequency circuit comprising a high frequency amplifier and a strip conductor member constituting a strip line with said second dielectric member and said grounded conductor member for electrically matching said high frequency amplifier with said feeder means of said microstrip antenna.

2. An antenna device according to claim 1, in which said high frequency amplifier includes input matching means and output matching means.

3. An antenna device according to claim 2, in which said input matching means is connected to the feeder means of said microstrip antenna.

4. An antenna device according to claim 3, in which said input matching means comprises a strip line including a first conductor line member, said second dielectric member and said grounded conductor member.

5. An antenna device according to claim 4, in which said input matching means comprises a d.c. blocking means and is connected to the feeder means of said microstrip antenna through an electrical conduction path provided by said blocking means.

6. An antenna device according to claim 5, in which said blocking means comprises a capacitor.

7. An antenna device according to claim 2, in which said output matching means comprises a strip line including a second conductor line member, said second dielectric member and said grounded conductor member.

8. An antenna device comprising:

a microstrip antenna formed on a first dielectric member, said microstrip antenna including a radiating conductor member disposed on a first major surface of said first dielectric member, and a grounded conductor member disposed on an opposing major surface of said first dielectric member;

a second dielectric member disposed on an opposite side of the grounded conductor member form said first dielectric member, such that said grounded conductor member is sandwiched between said first and second dielectric members; and

a high frequency circuit mounted on a surface of said second dielectric member which faces away from said grounded conductor member, said high frequency circuit being electrically connected to a feeder of said microstrip antenna, such that an electrical conduction path is provided between said high frequency circuit and said radiating conductor member, wherein said high frequency circuit comprises a high frequency amplifier and a strip conductor member constituting a strip line with said second dielectric member of electrically matching said high frequency amplifier with said feeder of said microstrip antenna.