GB2025146A - Printed circuit board - Google Patents
Printed circuit board Download PDFInfo
- Publication number
- GB2025146A GB2025146A GB7923417A GB7923417A GB2025146A GB 2025146 A GB2025146 A GB 2025146A GB 7923417 A GB7923417 A GB 7923417A GB 7923417 A GB7923417 A GB 7923417A GB 2025146 A GB2025146 A GB 2025146A
- Authority
- GB
- United Kingdom
- Prior art keywords
- printed circuit
- circuit card
- frequency
- circuit board
- earth potential
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K9/00—Screening of apparatus or components against electric or magnetic fields
- H05K9/0007—Casings
- H05K9/002—Casings with localised screening
- H05K9/0039—Galvanic coupling of ground layer on printed circuit board [PCB] to conductive casing
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K1/00—Printed circuits
- H05K1/02—Details
- H05K1/0213—Electrical arrangements not otherwise provided for
- H05K1/0216—Reduction of cross-talk, noise or electromagnetic interference
- H05K1/0218—Reduction of cross-talk, noise or electromagnetic interference by printed shielding conductors, ground planes or power plane
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K2201/00—Indexing scheme relating to printed circuits covered by H05K1/00
- H05K2201/07—Electric details
- H05K2201/0707—Shielding
- H05K2201/0715—Shielding provided by an outer layer of PCB
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K2201/00—Indexing scheme relating to printed circuits covered by H05K1/00
- H05K2201/09—Shape and layout
- H05K2201/09209—Shape and layout details of conductors
- H05K2201/0929—Conductive planes
- H05K2201/09336—Signal conductors in same plane as power plane
Landscapes
- Engineering & Computer Science (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Structure Of Receivers (AREA)
- Structure Of Printed Boards (AREA)
- Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
Abstract
A printed circuit board for assemblies in which oscillating high- frequency currents occur comprises a carrier plate (1) clad on one side with a copper film to form a large area low resistance element 2 at earth potential on in which sensitive high-frequency oscillating currents may flow. A second copper film is applied to the opposite side and etched to provide voltage supply paths 4 and high frequency lines 5 surrounded by areas 3 at earth potential. <IMAGE>
Description
SPECIFICATION
A printed circuit card
The invention relates to a printed circuit card for assemblies in communications eg for UHF tuners of television sets.
Printed circuits for tuners which have a printed circuit board clad on one side are known, in which high-frequency and operating currents flowing on the printed circuit board. The quality of the circuit arrangements is affected considerably by the arrangement of wiring connections and components on one side of the card due to electrical leakage fields. Moreover, the spatial dimensions of the components arranged on only one side of the printed circuit card limit to a certain extent the miniaturization of these circuit arrangements.
The present invention seeks to provide a printed circuit card in accordance with printed circuit board technology for assemblies of devices in communications, eg UHF tuners of television sets, which printed circuit card makes it possible to miniaturize these circuit arrangements while simultaneously restricting the electrical leakage fields occurring.
According to the invention, there is provided a printed circuit card for assemblies in communications, in which high frequency oscillating currents arise, where the printed circuit card comprises a carrier plate clad on both sides with a copper film to form a largearea low resistance earth potential on one side, of the plate in which the sensitive highfrequency oscillating currents flow and to form paths for voltage supply for the semiconductor components, insensitive high-frequency lines to components and semiconductors and earth paths on the other side of the plate.
By arranging the sensitive high-frequency lines in accordance with the invention in an embodiment of a UHF tuner, the oscillating currents may flow symmetrically and may be terminated on the shortest possible path on the said one side in the form of a chamber, whereby the leakage fields are restricted to a smaller spatial expanse. The arrangement of sensitive high-frequency lines moreover eliminates unfavourable effects on the circuit arrangement due to the dielectric losses of the carrier plate, whereby the circuit Q of the circuit arrangement is also increased. Finally, the arrangement of the components of both sides of the printed circuit card makes it possible to achieve further miniaturization of the dimensions of such a UHF tuner.
The invention will now be described in greater detail, by way of example, with reference to the drawings, in which: Figure 1 shows a plan view on to the upper side of a portion of a printed circuit card in accordance with the invention, and
Figure 2 shows a plan view of the underside of a portion of the printed circuit card shown in Fig. 1.
A film of copper is applied to both sides of a carrier plate 1 comprising electrically insulating material, for example laminated paper or plastics having a glass fibre lining, which lining has a very high resistance. This carrier plate 1 is treated so that a printed circuit board with wiring connections arranged on both sides is formed by etching away certain small areas of the copper film as in the case of a printed circuit. A large-area 2 at earth potential and of low in resistance is arranged on the upper side of the carrier plate 1 and the sensitive high-frequency currents flow in this earth potential 2.
Wiring connections for the voltage supply 4 and the non-critical high-frequency lines 5 are surrounded by the area 3 at earth potential on the underside of the carrier plate 1 and serve to connect together the connection points of the components 6 which are shown.
The capacitors C5, C7 and C8 are inserted into apertures or recesses which are arranged in the carrier plate 1 and are soldered to the earth potential area 3 and the high frequency connections on the upper and underside of the circuit arrangement.
Apertures or recesses accommodating the oscillator circuit inductances L3 and L5 are arranged in the carrier plate 1. Owing to this arrangement of the oscillator circuit inductances, the electrical leakage fields pass substantially through air and are very slightly attenuated. A screen against disturbing extraneous fields is formed like a high-frequency chamber by the film on the upper and under sides and being closed about the recess.
In order to achieve greater clarity, the connection points of the components arranged on the under side, said connection points starting from the upper side, are shown by their circuit signs in the embodiment shown. The components are soldered by the dip-soldering method.
A printed circuit card for components as above described makes it possible to construct a tuner in a further miniaturized form with a high-value electrical properties which can be manufactured easily in progressive assembly line technology.
Claims (3)
1. A printed circuit card for assemblies in communications, in which high-frequency oscillating currents arise, wherein the printed circuit card comprises a carrier plate clad on both sides with a copper film to form a largearea low resistance earth potential on one side of the plate in which the sensitive high-frequency oscillating currents flow and to form paths for voltage supply for the semiconductor components, insensitive high-frequency lines to components and semiconductors and earth paths on the other side of the plate.
2. A printed circuit card according to claim 1, wherein the said printed circuit card has chamber like recesses or apertures in which oscillating circuit inductances are arranged whereby the electrical leakage fields pass substantially in air, experience a very slight attenuation and the cladding forms a screen against disruptive extraneous fields outside as a result of its presence surround the recess or apetures on both sides.
3. A printed circuit board substantially as described herein with reference to the drawings.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19782829515 DE2829515C2 (en) | 1978-07-05 | 1978-07-05 | Circuit board for assemblies of telecommunications equipment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB2025146A true GB2025146A (en) | 1980-01-16 |
| GB2025146B GB2025146B (en) | 1982-08-04 |
Family
ID=6043598
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB7923417A Expired GB2025146B (en) | 1978-07-05 | 1979-07-05 | Printed circuit board |
Country Status (3)
| Country | Link |
|---|---|
| DE (1) | DE2829515C2 (en) |
| FR (1) | FR2430709A1 (en) |
| GB (1) | GB2025146B (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0151559A1 (en) * | 1984-02-03 | 1985-08-14 | Telefonaktiebolaget L M Ericsson | Transient protection unit |
| WO1990002477A1 (en) * | 1988-08-16 | 1990-03-08 | Brunswick Corporation | Apparatus and method for protecting engine electronics from radio frequency interference |
| EP0421343A2 (en) * | 1989-10-03 | 1991-04-10 | Matsushita Electric Industrial Co., Ltd. | Semiconductor element package and semiconductor element package mounting distributing circuit basic plate |
| EP0836369A2 (en) * | 1996-09-25 | 1998-04-15 | Philips Patentverwaltung GmbH | Printed circuit board |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4302876A1 (en) * | 1993-02-02 | 1994-08-04 | Quante Ag | Front end for electrical cabinets, housings, racks or the like |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2264112A1 (en) * | 1972-12-29 | 1974-07-11 | Siemens Ag | WIRING ARRANGEMENT WITH SIGNAL TRACKS DESIGNED IN THE TYPE OF A PRINTED CIRCUIT |
-
1978
- 1978-07-05 DE DE19782829515 patent/DE2829515C2/en not_active Expired
-
1979
- 1979-07-05 FR FR7917510A patent/FR2430709A1/en active Granted
- 1979-07-05 GB GB7923417A patent/GB2025146B/en not_active Expired
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0151559A1 (en) * | 1984-02-03 | 1985-08-14 | Telefonaktiebolaget L M Ericsson | Transient protection unit |
| WO1990002477A1 (en) * | 1988-08-16 | 1990-03-08 | Brunswick Corporation | Apparatus and method for protecting engine electronics from radio frequency interference |
| EP0421343A2 (en) * | 1989-10-03 | 1991-04-10 | Matsushita Electric Industrial Co., Ltd. | Semiconductor element package and semiconductor element package mounting distributing circuit basic plate |
| EP0421343A3 (en) * | 1989-10-03 | 1993-03-17 | Matsushita Electric Industrial Co., Ltd. | Semiconductor element package and semiconductor element package mounting distributing circuit basic plate |
| EP0836369A2 (en) * | 1996-09-25 | 1998-04-15 | Philips Patentverwaltung GmbH | Printed circuit board |
| EP0836369A3 (en) * | 1996-09-25 | 1999-10-06 | Philips Patentverwaltung GmbH | Printed circuit board |
Also Published As
| Publication number | Publication date |
|---|---|
| DE2829515A1 (en) | 1980-01-17 |
| FR2430709A1 (en) | 1980-02-01 |
| FR2430709B1 (en) | 1984-07-13 |
| GB2025146B (en) | 1982-08-04 |
| DE2829515C2 (en) | 1983-04-28 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| 732 | Registration of transactions, instruments or events in the register (sect. 32/1977) | ||
| PCNP | Patent ceased through non-payment of renewal fee |