US5684492A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Antenna device having a band pass filter
Assignee: Mitsubishi Electric Corp
•
Filing: 1995-03-01
•
Granted: 1997-11-04
•
Expires: 2015-03-01
Abstract
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.
Inventors
- 👤 Kenichi Kagoshima
- 👤 Koichi Tsunekawa
- 👤 Moriyasu Miyazaki
- 👤 Hideki Asao
- 👤 Osami Ishida
- 👤 Makoto Matsunaga
- 👤 Takashi Katagi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 16:14
CPC Classifications
H; H01; H01Q; H01Q9/00; H01Q9/04; H01Q9/30; H01Q9/40; H01P; H01P1/00; H01P1/20; H01P1/201; H01P1/205; H01P1/2056; H01Q9/0407; H01Q9/0421; H04; H04B; H04B1/00; H04B1/06; H04B1/16; H04B1/18; H04B1/38; H04B1/3827; H04B1/3833
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
110 words
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.
Claim 2
Dependent Claim
110 words
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.
Claim 3
Dependent Claim
80 words
An antenna device, comprising: a first conductive element; a second conductive element disposed below and substantially in parallel with the first conductive element; and N-1 resonators, wherein N is an integer greater than 1, disposed in parallel, between the first conductive element and the second conductive element whereby the N-1 resonators and the first conductive element combine to form an N-stage band pass filter, wherein said first conductive element acts as a last stage in said N-stage band pass filter.
Claim 4
Dependent Claim
80 words
An antenna device, comprising: a first conductive element; a second conductive element disposed below and substantially in parallel with the first conductive element; and N-1 resonators, wherein N is an integer greater than 1, disposed in parallel, between the first conductive element and the second conductive element whereby the N-1 resonators and the first conductive element combine to form an N-stage band pass filter, wherein said first conductive element acts as a last stage in said N-stage band pass filter.
Claim 5
Dependent Claim
25 words
The antenna device as claimed in claim 2, wherein the first conductive element operates at a quarter wavelength of a resonate frequency of the antenna.
Claim 6
Dependent Claim
30 words
The antenna device as claimed in claim 2, wherein the first conductive element is a circular resonator which operates at a half wavelength of a resonate frequency of the antenna.
Claim 7
Dependent Claim
26 words
The antenna device as claimed in claim 2, further comprising a capacitive element disposed between the first conductive element and one of the plurality of resonators.
Claim 8
Dependent Claim
37 words
The antenna device as claimed in claim 2, wherein one end of the plurality of resonators are short circuited together and an opposite end of at least one of a plurality of resonators is an open circuit.
Claim 9
Dependent Claim
28 words
The antenna device as claimed in claim 2, wherein the first conductive element comprises any one of a dipole antenna, an inverted F antenna, and a patch antenna.
Claim 10
Dependent Claim
19 words
The antenna device as claimed in claim 2, wherein the resonators are coupled together by means of electromagnetic coupling.
References Cited (Backward Citations)
US5125109A
Cited
US5068669A
Cited
US5142255A
Cited
US5434579A
Cited
US5400039A
Cited
US5455594A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2000-11-03 | 2001-05-05 | 2001-11-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2004-11-03 | 2005-05-05 | 2005-11-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2008-11-03 | 2009-05-05 | 2009-11-04 | $7700.00 | Window Closed / Lapsed |