US 5,684,492 A · Antenna device having a band pass filter

Abstract

In order to perform feeding to an inverted F antenna having a plate conductor of an approximately rectangular shape for forming a radiation conductor and a ground conductor arranged in parallel with the plate conductor, a strip conductor plate connected to a feeder line is provided on the ground conductor via a dielectric substrate. Hence, the feeding from the feeder line to the inverted F antenna 37 is performed by an electric field coupling of the plate conductor and the strip conductor plate. The inverted F antenna and a resonator are integrated by coupling means to carry out an impedance matching, and the inverted F antenna and the resonator 62 constitute a band pass filter.

Claims8

Dependent claims

A filter antenna device, comprising:

a resonant antenna element;
a resonator including a plurality of resonant elements, disposed in parallel and enclosed within a metal conductor;
coupling means for coupling the antenna element to an output of the resonator, said coupling means performed by an electromagnetic coupling, wherein through said coupling, the resonator and antenna element in combination perform an impedance matching between an input of the resonator, which is coupled to a feeding line, and the antenna element;
and
the antenna element and the resonator thereby comprising a band pass filter, wherein said antenna element acts as the resonant element of a last stage in said band pass filter.

2 more elements

Dependencies are inferred from the claim text.

Facts

Application

08/396,657Filed 1 Mar 1995 · continuation

Priority

JP 3-836228 Jan 1991

Granted

4 Nov 1997

Term ends

Not estimatedThe source records don’t support an estimate.

Classification8 codes

H01Q 9/40
With feed to end of elongated active element, e.g. unipole: element having extended radiating surface
H01P 1/2056
Comb or interdigital filters; Cascaded coaxial cavities: comb filters or interdigital filters with metallised resonator holes in a dielectric block
H01Q 9/0421
Substantially flat resonant element parallel to ground plane, e.g. patch antenna: with a shorting wall or a shorting pin at one end of the element
H04B 1/18
Circuits: input circuits, e.g. for coupling to an antenna or a transmission line

Antenna device having a band pass filter

Life of this patent

Antenna device having a band pass filter

Life of this patent

Abstract

Claims8