US 2014/0210674 A1 · PLANAR INVERTED F ANTENNA

Abstract

Provided is a planar inverted F antenna to which a feeding line can be readily connected. Two slits are provided up to locations where input impedance is Z (=50Ω), from the open end side of a main conductive plate that functions as an excitation conductive plate. 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. A planar inverted F antenna having a U-shaped or L-shaped cross-section is formed by folding on both sides or on one side of the MSL, along the longitudinal direction of the MSL. In other words, a planar inverted F antenna is formed that has the excitation conductive plate and the MSL arranged separated by a prescribed distance, on the outside of a ground conductive plate bent into a U-shaped or L-shaped cross-section. The positional relationship between the connection position for the feeding pin and the radiation end can be changed, by folding the planar inverted F antenna along the longitudinal direction of the MSL.

Claims4

Dependent claims

A planar inverted F antenna, comprising

a ground conductive plate which is folded at one or a plurality of point(s) along a prescribed direction and is to be connected to the ground,
a main conductive plate folded at one or two point(s) in the same direction as said prescribed direction, and
a short circuiting member for connecting said ground conductive plate and said main conductive plate at one or a plurality of point(s) on one side in said prescribed direction,
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 is 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.

5 more elements

Dependencies are inferred from the claim text.

Planar inverted f antenna

Life of this patent

Planar inverted f antenna

Life of this patent

Abstract

Claims4