# US 2014/0197996 A1 · Planar inverted f antenna

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- Number: US 2014/0197996 A1
- Document ID: US20140197996A1
- Status: Published application
- Kind: A1
- Application number: 14/240,123
- Filed: 2012-08-10
- Published: 2014-07-17
- Earliest claimed: 2011-08-26
- Assignees: Chikouji Gakuen Educational Foundation
- Inventors: Yoshiyuki Yonei; Masahiro Sobu; Akinori Matsui; Misao Haneishi
- Web page: https://patentgrep.com/patent/US20140197996A1

## CPC

- H01Q 9/0421: {with a shorting wall or a shorting pin at one end of the element (H01Q9/0414 takes precedence)}
- H01Q 5/364: Creating multiple current paths
- H01Q 9/045: {with particular feeding means (for circular polarisation H01Q9/0428)}
- H01Q: ANTENNAS, i.e. RADIO AERIALS (radiators or antennas for microwave heating H05B6/72)

## Abstract

Provided is a planar inverted F antenna to which a feeding line can be readily connected. Two slits are provided from the open end side of a main conductive plate that functions as an excitation conductive plate up to locations where input impedance is Z (=50Ω). Between these slits is used as a microstrip line (MSL) and the width (w) is determined such that the characteristic impedance for the transmission line is Z. Power can be supplied by the MSL to the locations where input impedance is Z, by providing the slits from the radiation end side of the main conductive plate and using part of the main conductive plate as the MSL. For connection of the feeding line from the outside, a characteristic impedance (Z) connection line, for example the central conductor for a coaxial line, is used and connected as the feeding pin to the open end of the MSL. The connection position for the feeding pin is not a feeding point as required for position precision, because there is no need to consider position precision and connection can, therefore, be readily made. In addition, the connection end and the radiation end of the feeding pin can be provided on the same side.

## Claims

### Claim 1

A planar inverted F antenna, comprising
a ground conductive plate to be connected to the ground,
a short circuiting member connected to said ground conductive plate, and
a main conductive plate to the side of one end of which said short circuiting member is connected,
said main conductive plate, comprising:
one or a plurality of slit(s) formed from the other end on the side opposite to the side to which said short circuiting member has been connected up to a position where an input impedance of the antenna becomes Z;
a microstrip line which is formed between a side end of said main conductive plate and said one slit, or between adjacent slits in said plurality of slits with a width w that a characteristic impedance becomes Z and to which a feeding line is to be connected; and
one or a plurality of excitation conductive plate(s) formed on a side of said slit to which said microstrip line is not adjacent.

### Claim 2 (depends on 1)

The planar inverted F antenna according to claim 1, wherein
said ground conductive plate, said short circuiting member and said main conductive plate are integrally formed from one mutually contiguous conductive plate and are formed by being folded in the same direction at a connection part of said ground conducive plate with said short circuiting member and a connection part of said short circuiting member with said main conductive plate.

### Claim at position 3

-8. (canceled)