Microstrip antenna

Patent metadata

Field	Value
Publication number	US-9799958-B2
Application number	US-201414903163-A
Country	US
Kind code	B2
Filing date	May 16, 2014
Priority date	Jul 9, 2013
Publication date	Oct 24, 2017
Grant date	Oct 24, 2017

Abstract

A microstrip antenna has two feed points. The microstrip antenna includes a feeder circuit which is configured to feed, to the two feed points, electric signals whose phases are different by 90° from each other. The feeder circuit includes a Wilkinson coupler unit and a phase-shift unit each of which is formed as a lumped constant circuit.

First claim

The invention claimed is:

1. A microstrip antenna having two feed points, the microstrip antenna comprising a feeder circuit which is configured to feed, to the two feed points, electric signals whose phases are different by 90° from each other, the feeder circuit including a Wilkinson coupler unit and a phase-shift unit each of which is formed as a lumped constant circuit,
wherein a distance between each of the feed points and a center of a patch electrode is larger than a distance in which impedance is matched.

2. The microstrip antenna according to claim 1 , wherein a size of a dielectric body in which the patch electrode is formed is equal to or smaller than 25 mm×25 mm, and the distance between the feed point and the center of the patch electrode is set so that an antenna gain in a desired frequency range is equal to or larger than 0 dBic.

3. The microstrip antenna according to claim 1 , wherein a size of a dielectric body in which the patch electrode is formed is equal to or smaller than 25 mm×25 mm, the microstrip antenna comprises a substrate in which the feeder circuit is formed on a back surface opposite to a surface where the dielectric body is provided, and a length and width of the substrate are substantially equal to or smaller than a length and width of the dielectric body.

4. The microstrip antenna according to claim 1 , wherein a size of a dielectric body in which the patch electrode is formed is equal to or smaller than 25 mm×25 mm, and the distance between each of the feed points and the center of the patch electrode is set to be larger than the distance in which the impedance is matched, so that an antenna gain in a frequency range of 1573.374 MHz to 1605.8865 MHz is equal to or larger than 1 dBic.

5. The microstrip antenna according to claim 1 , wherein a size of a dielectric body in which the patch electrode is formed is equal to or smaller than 20 mm×20 mm, and the distance between each of the feed points and the center of the patch electrode is set to be larger than the distance in which the impedance is matched, so that an antenna gain in a frequency range of 1573.374 MHz to 1605.8865 MHz is equal to or larger than 0 dBic.

6. The microstrip antenna according to claim 1 , wherein a size of a dielectric body in which the patch electrode is formed is 20 mm×20 mm×4 mm, and an antenna gain in a frequency range of 1573.374 MHz to 1605.8865 MHz is equal to or larger than 0 dBic.

7. The microstrip antenna according to claim 1 , wherein a size of a dielectric body in which the patch electrode is formed is 25 mm×25 mm×7 mm, and an antenna gain in a frequency range of 1573.374 MHz to 1605.8865 MHz is equal to or larger than 3 dBic.

Assignees

• Yokowo Seisakusho Kk

Inventors

• Sampo Takeshi
• Kowaita Kazuhiro

Classifications

• H03H7/48

  Networks for connecting several sources or loads, working on the same frequency or frequency band, to a common load or source (phase shifters providing two or more output signals H03H7/21) · CPC title

• H01Q13/106

  Microstrip slot antennas (patch antenna elements H01Q9/0407) · CPC title

• H01Q9/0442 Primary

  with particular tuning means · CPC title

• H01Q9/0435 Primary

  using two feed points · CPC title