US4772862A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Filter apparatus
Assignee: Panasonic Holdings Corp
•
Filing: 1986-12-16
•
Granted: 1988-09-20
•
Expires: 2006-12-16
Abstract
Abstract On an upper surface of a substrate (20) a band-pass filter (29) is provided, and on the opposite (lower) surface of a substrate (20) a low-pass filter comprising a conductive layer pattern (27) and capacitors (22,23) is provided, wherein a conductive layers (27) are provided on substantially the entire area of the upper surface excluding portions for terminals and on the lower surface excluding portions for the low-pass filter and the terminals, and by connecting both conductive layers by means of a row of through-hole connections, the input terminal (24) and the output terminal (25) are shielded from each other.
Inventors
- 👤 Kazuhiko Kubo
- 👤 Akira Usui
- 👤 Hiroyuki Nagai
- 👤 Hideyuki Miyake
- 👤 Takashi Fujino
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 14:36
CPC Classifications
H; H03; H03H; H03H7/00; H03H7/01
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
201 words
A filter apparatus comprising: a substrate of insulating material; a low-pass filter provided on a first surface of said substrate having an input terminal, an output terminal, at least one capacitor and at least one coil formed by a strip of specified pattern of a conductive layer provided on said first surface of the substrate; a band-pass filter provided on a second surface of said substrate having an input terminal and an output terminal disposed on the first surface of the substrate, wherein said input terminal of said band-pass filter is connected to said output terminal of said low-pass filter; a first grounding conductive layer provided over substantially the entire first surface of said substrate excluding a portion thereof containing said low-pass filter and small portions thereof surrounding said input terminal and said output terminal of the band-pass filter; a second grounding conductive layer underlying said band-pass filter and provided on substantially the entire second surface of the substrate excluding small portions thereof surrounding said input and output terminals of the band-pass filter; and a plurality of through-holes provided in said substrate and having conductor means disposed therein for connecting said first grounding conductive layer and the second grounding conductive layer.
Claim 2
Dependent Claim
201 words
A filter apparatus comprising: a substrate of insulating material; a low-pass filter provided on a first surface of said substrate having an input terminal, an output terminal, at least one capacitor and at least one coil formed by a strip of specified pattern of a conductive layer provided on said first surface of the substrate; a band-pass filter provided on a second surface of said substrate having an input terminal and an output terminal disposed on the first surface of the substrate, wherein said input terminal of said band-pass filter is connected to said output terminal of said low-pass filter; a first grounding conductive layer provided over substantially the entire first surface of said substrate excluding a portion thereof containing said low-pass filter and small portions thereof surrounding said input terminal and said output terminal of the band-pass filter; a second grounding conductive layer underlying said band-pass filter and provided on substantially the entire second surface of the substrate excluding small portions thereof surrounding said input and output terminals of the band-pass filter; and a plurality of through-holes provided in said substrate and having conductor means disposed therein for connecting said first grounding conductive layer and the second grounding conductive layer.
Claim 3
Dependent Claim
22 words
A filter apparatus in accordance with claim 1, wherein said through-holes are disposed in rows so as to surround said low-pass filter.
Claim 4
Dependent Claim
28 words
A filter apparatus in accordance with claim 1, wherein said through-holes are disposed in a row between the input terminal and the output terminal of said band-pass filter.
Claim 5
Dependent Claim
39 words
A filter apparatus in accordance with claim 1, wherein said through-holes are provided in a row surrounding said low-pass filter and are also disposed in a row between the input terminal and the output terminal of said band-pass filter.
Claim 6
Dependent Claim
20 words
A filter apparatus in accordance with claim 1, wherein said band-pass filter comprises a dielectric filter of coaxial resonance type.
Claim 7
Dependent Claim
26 words
A filter apparatus in accordance with claim 5, wherein said through-holes are disposed in the form of a row so as to surround said low-pass filter.
Claim 8
Dependent Claim
31 words
A filter apparatus in accordance with claim 5, wherein said through-holes are disposed in the form of a row between the input terminal and the output terminal of said band-pass filter.
Claim 9
Dependent Claim
38 words
A filter apparatus in accordance with claim 5, wherein said through-holes are provided in a row surrounding said low-pass filter and are disposed in a row between the input terminal and the output terminal of said band-pass filter.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-09-20 | 1992-03-21 | 1992-09-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-09-20 | 1996-03-21 | 1996-09-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-09-20 | 2000-03-21 | 2000-09-20 | $7700.00 | Window Closed / Lapsed |