GB2027299A - Capacitively tuneable circuit in ???/4 technique - Google Patents
Capacitively tuneable circuit in ???/4 technique Download PDFInfo
- Publication number
- GB2027299A GB2027299A GB7926119A GB7926119A GB2027299A GB 2027299 A GB2027299 A GB 2027299A GB 7926119 A GB7926119 A GB 7926119A GB 7926119 A GB7926119 A GB 7926119A GB 2027299 A GB2027299 A GB 2027299A
- Authority
- GB
- United Kingdom
- Prior art keywords
- circuit
- strip conductor
- collector lead
- capacitively
- tuning
- 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
- 238000000034 method Methods 0.000 title claims description 15
- 239000004020 conductor Substances 0.000 claims abstract description 35
- 239000011248 coating agent Substances 0.000 claims abstract description 10
- 238000000576 coating method Methods 0.000 claims abstract description 10
- 238000005452 bending Methods 0.000 claims abstract description 7
- 230000003534 oscillatory effect Effects 0.000 claims description 8
- 230000000903 blocking effect Effects 0.000 claims description 6
- 239000003990 capacitor Substances 0.000 claims description 4
- 238000010276 construction Methods 0.000 claims description 2
- 238000010586 diagram Methods 0.000 claims description 2
- 238000009966 trimming Methods 0.000 claims description 2
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P1/00—Auxiliary devices
- H01P1/20—Frequency-selective devices, e.g. filters
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03B—GENERATION OF OSCILLATIONS, DIRECTLY OR BY FREQUENCY-CHANGING, BY CIRCUITS EMPLOYING ACTIVE ELEMENTS WHICH OPERATE IN A NON-SWITCHING MANNER; GENERATION OF NOISE BY SUCH CIRCUITS
- H03B5/00—Generation of oscillations using amplifier with regenerative feedback from output to input
- H03B5/18—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising distributed inductance and capacitance
- H03B5/1841—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising distributed inductance and capacitance the frequency-determining element being a strip line resonator
- H03B5/1847—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising distributed inductance and capacitance the frequency-determining element being a strip line resonator the active element in the amplifier being a semiconductor device
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03J—TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
- H03J3/00—Continuous tuning
- H03J3/02—Details
- H03J3/16—Tuning without displacement of reactive element, e.g. by varying permeability
- H03J3/18—Tuning without displacement of reactive element, e.g. by varying permeability by discharge tube or semiconductor device simulating variable reactance
- H03J3/185—Tuning without displacement of reactive element, e.g. by varying permeability by discharge tube or semiconductor device simulating variable reactance with varactors, i.e. voltage variable reactive diodes
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03B—GENERATION OF OSCILLATIONS, DIRECTLY OR BY FREQUENCY-CHANGING, BY CIRCUITS EMPLOYING ACTIVE ELEMENTS WHICH OPERATE IN A NON-SWITCHING MANNER; GENERATION OF NOISE BY SUCH CIRCUITS
- H03B2200/00—Indexing scheme relating to details of oscillators covered by H03B
- H03B2200/003—Circuit elements of oscillators
- H03B2200/004—Circuit elements of oscillators including a variable capacitance, e.g. a varicap, a varactor or a variable capacitance of a diode or transistor
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03B—GENERATION OF OSCILLATIONS, DIRECTLY OR BY FREQUENCY-CHANGING, BY CIRCUITS EMPLOYING ACTIVE ELEMENTS WHICH OPERATE IN A NON-SWITCHING MANNER; GENERATION OF NOISE BY SUCH CIRCUITS
- H03B2201/00—Aspects of oscillators relating to varying the frequency of the oscillations
- H03B2201/02—Varying the frequency of the oscillations by electronic means
- H03B2201/0208—Varying the frequency of the oscillations by electronic means the means being an element with a variable capacitance, e.g. capacitance diode
Landscapes
- Filters And Equalizers (AREA)
- Structure Of Receivers (AREA)
- Magnetic Resonance Imaging Apparatus (AREA)
- Credit Cards Or The Like (AREA)
- Parts Printed On Printed Circuit Boards (AREA)
- Fixed Capacitors And Capacitor Manufacturing Machines (AREA)
Abstract
The circuit comprises a printed circuit board 1 supporting the components of the circuit and also a strip conductor 2. The components include a transistor 4 (which may be an RF stage amplifier). The collector of the transistor is arranged mechanically parallel to the strip conductor and the circuit 4 is tuned by bending the collector lead. The collector lead has an insulating coating 5 or the strip conductor has an insulating coating 6. <IMAGE>
Description
SPECIFICATION
Capacitively tunable circuit in A/4 tech
nique
The present invention relates to a capacitively tuneable circuit in A/4 technique.
In a known such tuneable oscillatory circuit arrangement a capacity trimmer is provided for tuning the oscillatory circuit at the high resistance point of the oscillatory circuit.
The tuning and synchronising are effected by adjustment of this capacity trimmer.
German Patent 1 1 87 279 discloses an oscillatory circuit having a cavity resonator in printed circuit form. The circuit has an inner conductor within a metallic cavity. The inner conductor comprises two leads spaced apart and arranged between the high resistance point and the earth point of the cavity resonator. The inductance of the resonator is adjusted by adjusting the distance between the two leads. The capacitance of the circuit is adjusted using a timmer capacitor in parallel with a tuning capacitor.
In accordance with the invention, there is provided a capacitively tuneable circuit in A/4 technique, including a circuit board on which there is arranged a strip conductor electrically connected to a reference potential, and a transistor having a collector lead extending parallel to and spaced from the strip conductor and arranged to be moveable by bending, whereby adjustment of the frequency of the circuit is effected by increasing or reducing the distance between, and thus the capacitance of, the extended collector lead and the strip conductor.
An example of the invention will now be described with reference to Fig. 1 which is a schematic diagram of a capacitively tuneable circuit in A/4 technique.
The circuit shown in the figure may form for example part of a tuning circuit connected between an antenna and a mixer. The tuning circuit may include a band filter of which the circuit shown in Fig. 1 is the primary circuit.
The circuit comprises a printed circuit board on which the components of the circuit are arranged the components including a transistor 4 a variable capacity diode 8 and a blocking condenser 9. The transistor 4 may be an RF stage amplifier of the tuning circuit.
Furthermore a strip conductor 2 is applied to the board by printed circuit technique together with the conductors connecting the components, and is connected electrically to ground. The collector lead 3 of the transistor 4, which for characterising the manufacturer is made longer than the other leads, is arranged parallel to the strip conductor 2 and is arranged to be moveable. The end of the extended collector lead 3 is connected at the high resistance point 7 of the circuit to a variable capacity diode 8 which is variable in capacity by means of a tuning voltage UD. A blocking condenser 9 serves for blocking the tuning voltage UD. The adjustment of the circuit is now effected by increasing or reducing the distance between the extended collector terminal 3 and the strip conductor 2 by bending.In order to exclude a short circuit in the case of a very small distance between collector lead 3 and strip conductor 2, either the moveable extended collector lead 3 is provided with an insulating coating 5 or the strip conductor 2 is provided with an insulating coating 6.
By this construction, in particular in circuits in A/4 technique, the trimming condenser, otherwise necessarily provided at the high resistance point 7 can be dispensed with; adjustment of the circuit at the high frequency end of the band being achieved by adjusting the position of the collector lead 3 relative to the earthed strip conductor 3.
1. A capacitively tuneable circuit in A/4 technique, including a circuit board on which there is arranged a strip conductor electrically connected to a reference potential, a transistor having a collector lead extending parallel to and spaced from the strip conductor and arranged to be movable by bending, whereby adjustment of the frequency of the circuit is effected by increasing or reducing the distance between, and thus the capacitance of, the extended collector lead and the strip conductor.
2. A circuit according to Claim 1, wherein the movable part of the collector terminal of the transistor is provided with an insulating coating.
3. A circuit according to Claim 1, wherein the strip conductor arranged on the circuit board is provided with an insulating coating.
4. A capacitively tuneable circuit substantially as hereinbefore described with reference to Fig. 1 of the accompanying drawing.
**WARNING** end of DESC field may overlap start of CLMS **.
Claims (4)
1. A capacitively tuneable circuit in A/4 technique, including a circuit board on which there is arranged a strip conductor electrically connected to a reference potential, a transistor having a collector lead extending parallel to and spaced from the strip conductor and arranged to be movable by bending, whereby adjustment of the frequency of the circuit is effected by increasing or reducing the distance between, and thus the capacitance of, the extended collector lead and the strip conductor.
2. A circuit according to Claim 1, wherein the movable part of the collector terminal of the transistor is provided with an insulating coating.
3. A circuit according to Claim 1, wherein the strip conductor arranged on the circuit board is provided with an insulating coating.
4. A capacitively tuneable circuit substantially as hereinbefore described with reference to Fig. 1 of the accompanying drawing.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19782833105 DE2833105A1 (en) | 1978-07-28 | 1978-07-28 | CAPACITIVE TUNABLE CIRCUIT IN LAMBDA / 4 TECHNOLOGY |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB2027299A true GB2027299A (en) | 1980-02-13 |
| GB2027299B GB2027299B (en) | 1982-08-04 |
Family
ID=6045586
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB7926119A Expired GB2027299B (en) | 1978-07-28 | 1979-07-26 | Capacitively tuneable circuits in x/4 technique |
Country Status (7)
| Country | Link |
|---|---|
| JP (1) | JPS5521693A (en) |
| AT (1) | AT377869B (en) |
| DE (1) | DE2833105A1 (en) |
| ES (1) | ES482683A1 (en) |
| FR (1) | FR2435828A1 (en) |
| GB (1) | GB2027299B (en) |
| IT (1) | IT1122246B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0222445A1 (en) * | 1985-11-05 | 1987-05-20 | Philips Electronique Grand Public | Circuit with a microstrip resonator |
| EP1540839A1 (en) * | 2002-08-20 | 2005-06-15 | Lockheed Martin Corporation | Method and apparatus for modifying a radio frequency response |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5940235U (en) * | 1982-09-06 | 1984-03-14 | 福井機械株式会社 | Pallet loading device for pressed products |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2774045A (en) * | 1951-10-17 | 1956-12-11 | Gen Electric | Ultra-high-frequency tuner |
| DE1125018B (en) * | 1959-12-04 | 1962-03-08 | Siemens Ag | Transformation line with wave resistance that can be changed continuously within a certain range |
| US3466575A (en) * | 1965-07-30 | 1969-09-09 | Rca Corp | Semiconductor delay line |
| US3670270A (en) * | 1968-04-15 | 1972-06-13 | Technitrol Inc | Electrical component |
| JPS5132252B1 (en) * | 1970-05-21 | 1976-09-11 | ||
| DE2434144C3 (en) * | 1974-07-16 | 1980-03-13 | Georg Dipl.-Ing. Dr.-Ing. 8152 Feldkirchen-Westerham Spinner | Coaxial directional coupler with adjustable coupling attenuation |
-
1978
- 1978-07-28 DE DE19782833105 patent/DE2833105A1/en not_active Ceased
-
1979
- 1979-07-20 IT IT24537/79A patent/IT1122246B/en active
- 1979-07-20 ES ES482683A patent/ES482683A1/en not_active Expired
- 1979-07-26 JP JP9431379A patent/JPS5521693A/en active Pending
- 1979-07-26 FR FR7919322A patent/FR2435828A1/en active Granted
- 1979-07-26 GB GB7926119A patent/GB2027299B/en not_active Expired
- 1979-07-27 AT AT0519679A patent/AT377869B/en not_active IP Right Cessation
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0222445A1 (en) * | 1985-11-05 | 1987-05-20 | Philips Electronique Grand Public | Circuit with a microstrip resonator |
| US4719435A (en) * | 1985-11-05 | 1988-01-12 | U.S. Philips Corporation | Resonant microstrip-line circuit |
| EP1540839A1 (en) * | 2002-08-20 | 2005-06-15 | Lockheed Martin Corporation | Method and apparatus for modifying a radio frequency response |
| EP1540839A4 (en) * | 2002-08-20 | 2008-01-02 | Lockheed Corp | Method and apparatus for modifying a radio frequency response |
| US7639987B2 (en) | 2002-08-20 | 2009-12-29 | Lockheed Martin Corporation | Method and apparatus for modifying a radio frequency response |
Also Published As
| Publication number | Publication date |
|---|---|
| FR2435828A1 (en) | 1980-04-04 |
| FR2435828B1 (en) | 1984-01-27 |
| ATA519679A (en) | 1984-09-15 |
| AT377869B (en) | 1985-05-10 |
| JPS5521693A (en) | 1980-02-15 |
| IT7924537A0 (en) | 1979-07-20 |
| DE2833105A1 (en) | 1980-02-07 |
| GB2027299B (en) | 1982-08-04 |
| ES482683A1 (en) | 1980-04-16 |
| IT1122246B (en) | 1986-04-23 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PCNP | Patent ceased through non-payment of renewal fee |