EP0769213A1 - Transformateur d'impedance a haute frequence - Google Patents
Transformateur d'impedance a haute frequenceInfo
- Publication number
- EP0769213A1 EP0769213A1 EP95924356A EP95924356A EP0769213A1 EP 0769213 A1 EP0769213 A1 EP 0769213A1 EP 95924356 A EP95924356 A EP 95924356A EP 95924356 A EP95924356 A EP 95924356A EP 0769213 A1 EP0769213 A1 EP 0769213A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- coupling
- secondary line
- ground plane
- line
- adaptation
- 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
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P5/00—Coupling devices of the waveguide type
- H01P5/04—Coupling devices of the waveguide type with variable factor of coupling
Definitions
- the present invention relates to the field of signal transmission between devices or circuits having different physical and electrical characteristics and requiring adaptation, and relates to a coupling and adaptation circuit intended to connect together a device with low impedance of output and a device with very high input impedance, for the transmission of high frequency and microwave signals.
- Slot scan cameras operating in synchronous scanning also called “synchroscan” are often used to observe recurrent light phenomena which repeat with a constant frequency fo of the order of a hundred megahertz (MHz).
- V (t) applied to the deflection plates of the image converter tube is sinusoidal and, therefore, its development is easier than that of a linear ramp, - it is relatively insensitive to phase fluctuations of the light signal .
- FIG. 1 of the appended drawings The functional diagram of such a camera 1 and of its synchronization loop 2 of its scanning circuit 2 'is reproduced in FIG. 1 of the appended drawings.
- Part of the light signal to be analyzed is converted by a fast photodiode 3 into a voltage of period 1 / fQ which is shaped, then multiplied in frequency by a suitable circuit 4.
- the harmonic of rank n is then isolated by a bandpass filter 5, injected into a power amplifier 6 and, finally, applied to the deflection plates 7, 7 'of the scanning circuit 2' via a adaptation unit 8, currently in the form of a selective impedance transformer whose role is to optimize the power transfer between the amplifier 6 and the scanning circuit 2 '.
- V (t) Vosin (2 ⁇ nfQt) with n> 1
- the problem posed by the present invention therefore consists in designing and producing a coupling and adaptation circuit, of simple structure, compact, making it possible to ensure the transmission of high frequency and microwave signals (of a few tens from MHz to several GHz) l () between two non-tuned and unsuitable devices, having very different impedances, in particular between a high frequency amplifier or generator of a scanning synchronization loop and the integrated scanning device or circuit or deflection plates of a working slit scan camera
- the subject of the present invention is a coupling and adaptation circuit intended to connect together a device with low output impedance and a device with very high input impedance, for the transmission of high frequency and 0 signals.
- microwave characterized in that it is mainly constituted on the one hand, by two portions of lines having parts arranged in parallel and weakly coupled together, one of which, primary, forms a short circuit and is connected to the device at low output impedance and of which the other, secondary, is connected to the device with very high input impedance, on the other hand, by a ground plane arranged parallel to the portion of secondary line and which can be part of an envelope shielding surrounding said coupling and adaptation circuit, and, finally, by a means of relative displacement of the portion of secondary line with respect to the 0 ground plane and / or of variation of the a length of the secondary line portion located opposite said ground plane.
- FIG. 1 is a schematic representation of a slot scanning camera operating in so-called "synchroscan" mode together with its scanning synchronization loop
- FIG. 2 is a perspective view of a coupling and adaptation circuit according to the invention, connected to the two devices to be tuned
- FIG. 3 is an equivalent electrical diagram of the assembly [low impedance device of output (amplifier or HF generator) - coupling and adaptation circuit - device with very high input impedance], shown in Figure 2.
- the coupling and adaptation circuit 8 mainly consists on the one hand, by two portions of lines 9, 10 having parts 9 ', 10 * arranged in parallel and weakly coupled together, one of which 9, primary, forms a short circuit and is connected to device 6 with low output impedance and the other of which 10, secondary, is connected to device 2; 7, 7 'with very high input impedance, on the other hand, by a ground plane 1 1 arranged parallel to the portion of secondary line 10 and which can be part of an electromagnetic shielding envelope 1 1' surrounding said circuit 8 for coupling and adaptation, and finally by means 12 for relative displacement of the portion of secondary line 9 relative to the ground plane 1 1 and / or variation of the length of the portion of secondary line 10 located opposite said ground plane 1 1, causing a variation in the same direction of the characteristic impedance Z2 of said portion of secondary line 10, in association with the ground plane 1 1, and therefore of its inductance L2, with a view to the agreement of the inductance
- the coupling and adaptation circuit 8 also comprises means 1 3, 1 3 ' relative displacement, in terms of spacing distance, of the primary line portion 9 relative to the secondary line portion 1 0 or vice versa, more particularly of their respective parts 9 'and 1 0' facing each other, thus making it possible to adjust the degree of coupling between the two portions of lines 9 and 10 and therefore the transformation ratio k, between primary and secondary, with adaptation of the output resistance RS of device 6 with the input resistance R'S + R'P of device 7, 7 ', due to ohmic and dielectric losses.
- the primary line portion 9 consists of a microstrip or microstrip air line whose length and characteristic impedance Z l are sufficiently low so that its equivalent inductance L l is negligible compared to the output resistance RS of the device 6 with low output impedance and the secondary line portion 10 is composed of an air microstrip line and has a sufficiently high characteristic impedance Z2 for that said portion of secondary line 10 can be assimilated to a pure inductance L2 whose value is given by the expression
- the midpoint 1 6 of the portion of secondary line 1 0, generally confused with the midpoint of the part 1 0 ′, can advantageously be earthed, for example by connection to the ground plane 1 I.
- Agreement at the secondary level may be achieved, for example, either by means of adjusting the length of the portion of secondary line 1 0 located in the housing constituted by the shielding casing 1 1 ′, these bodies being able to be arranged on the external face of said housing and level of the outlet of the connection lines 14, 14 ′ or of the ends of the portion of secondary line 10 (passing through the shielded housing at the level of a zone 11 "made of an insulating material) , or by a system of displacement by translation of said ground plane 1 1 with respect to the portion of secondary line 10 in a direction perpendicular to the axis of the part 10 '.
- the means 12 for relative displacement of the portion of secondary line 10 relative to the ground plane 1 1 consists of a member for deformation by bending of said plane mass 1 1. Furthermore, with a view to adjusting the distance between the parts 9 'and 1 0' opposite the line portions 9 and 1 0, provision may be made, as also shown in FIG.
- the primary line portion 9 is mounted on a support 13 which can be moved or tilted, for example by deformation, in a direction perpendicular to the longitudinal axes of the parts 9 ′ and 10 ′ of the primary line 9 and secondary line portions 10 parallel to each other, by actuating a member 1 3 ′ for adjusting the position of said support 13.
- the members 1 2 and 1 3 'for deformation and adjustment of the position consist of screws with small pitch, housed in fixed insulating supports 1 7, 1 7', each provided with 'at least one corresponding threaded orifice, the heads of said screws being advantageously located outside of the shielding casing 1 1' so as to facilitate accessibility and manual adjustment.
- the circuit 8 for coupling and adaptation according to the invention is more particularly intended to be integrated into a scanning synchronization loop 2 connected to the deflection plates 7, 7 ′ or to the scanning circuit of a slot scanning camera 1 operating in synchronous scanning mode, the ends of the portion of secondary line 10 being connected respectively via connection lines 14, 14 'to one of the two deflection plates 7 or 7' of said camera 1 ( Figures 1 and 2).
- the circuit 8 is essentially formed by two sections or portions of air microstrip type lines which are parallel over a length of approximately 3 cm and weakly coupled.
- the second line 1 0 (or secondary) is connected to the deflection assembly, in particular to the plates 7, 7 ', and its midpoint 1 6 is grounded so as to increase the rejection rate of the common mode.
- ground plane 1 1 is an integral part of an external electromagnetic shield 1 1 'which avoids losses by radiation (this shielding is only represented by dashed lines in FIG. 2 in order not to complicate the drawing).
- the characteristic impedance Z l and the length of the primary line 9 are low enough that its equivalent inductance L l is negligible compared to RS.
- the screw 1 3 makes it possible to modify the separation of the two parts 9' and 10 'opposite said portions 9 and 10 of lines and therefore the degree of coupling (weak) between primary and secondary: this effect can be described by a perfect step-down transformer with adjustable ratio k ( ⁇ 0, 1).
- the amplifier 6 / circuit 8 / deflection circuit assembly (plates 7, 7 ') is equivalent to the quadrupole shown in FIG. 3.
- LG2 designates the overall inductance which integrates that of the wires or connection lines 14, 14 ′ and, if necessary, that of an auxiliary choke 1 5; it is chosen such that: (LG2 + L2) ⁇ ⁇ 1 / CG2 x ⁇
- the scanning circuit is fine tuned by adjusting the variable inductance L2 (screw 1 2),
- the coupling and adaptation circuit 8 has therefore been produced using techniques specific to circuits operating at high frequencies and at high frequencies, in particular by using lines of the "microstrip" or microstrip type weakly coupled by electric field. This design guarantees a reduced overall dimensions and negligible losses provided that the radiation is minimized by an external shielding 1 1 '.
- the judicious choice of the geometric parameters of the secondary line 10 makes it possible to reduce the inductance L2 sufficiently so that the image converter tube of the camera 2 can operate at a frequency very close to its resonance.
Landscapes
- Microwave Amplifiers (AREA)
- Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
- Details Of Television Scanning (AREA)
- Details Of Connecting Devices For Male And Female Coupling (AREA)
- Filters And Equalizers (AREA)
- Coils Or Transformers For Communication (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR9408598A FR2722338B1 (fr) | 1994-07-07 | 1994-07-07 | Dispositif de couplage et d'adaptation pour la transmission de signaux haute frequence ou hyperfrequence |
FR9408598 | 1994-07-07 | ||
PCT/FR1995/000836 WO1996002073A1 (fr) | 1994-07-07 | 1995-06-22 | Transformateur d'impedance a haute frequence |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0769213A1 true EP0769213A1 (fr) | 1997-04-23 |
EP0769213B1 EP0769213B1 (fr) | 1998-05-20 |
Family
ID=9465271
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP95924356A Expired - Lifetime EP0769213B1 (fr) | 1994-07-07 | 1995-06-22 | Transformateur d'impedance a haute frequence |
Country Status (9)
Country | Link |
---|---|
US (1) | US5774026A (fr) |
EP (1) | EP0769213B1 (fr) |
JP (1) | JPH10505716A (fr) |
CA (1) | CA2194470A1 (fr) |
DE (1) | DE69502610T2 (fr) |
DK (1) | DK0769213T3 (fr) |
ES (1) | ES2119456T3 (fr) |
FR (1) | FR2722338B1 (fr) |
WO (1) | WO1996002073A1 (fr) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
AUPO076496A0 (en) * | 1996-07-01 | 1996-07-25 | Radio Frequency Systems Pty Limited | Input coupling adjustment arrangement for radio frequency filters |
KR100295154B1 (ko) | 1998-06-12 | 2001-09-17 | 윤종용 | 임피던스정합회로 |
JP4575261B2 (ja) * | 2005-09-14 | 2010-11-04 | 株式会社東芝 | 高周波用パッケージ |
KR101384328B1 (ko) | 2006-03-23 | 2014-04-10 | 가오 가부시키가이샤 | 세균막 형성 억제제 조성물 |
US7724484B2 (en) * | 2006-12-29 | 2010-05-25 | Cobham Defense Electronic Systems Corporation | Ultra broadband 10-W CW integrated limiter |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB573365A (en) * | 1941-06-03 | 1945-11-19 | John Collard | Improvements in or relating to high-frequency transformers |
US3166723A (en) * | 1961-03-06 | 1965-01-19 | Micro Radionics Inc | Variable directional coupler having a movable articulated conductor |
US3363201A (en) * | 1965-03-25 | 1968-01-09 | Harold B. Isaacson | Variable attenuator having low minimum insertion loss |
US3560885A (en) * | 1968-11-18 | 1971-02-02 | Textron Inc | Variable radio-frequency coupler |
JPH0722242B2 (ja) * | 1985-12-27 | 1995-03-08 | 島田理化工業株式会社 | 同軸導波管変換器 |
DE3617359C1 (de) * | 1986-05-23 | 1987-10-01 | Georg Dr-Ing Spinner | 3-dB-Richtkoppler |
-
1994
- 1994-07-07 FR FR9408598A patent/FR2722338B1/fr not_active Expired - Fee Related
-
1995
- 1995-06-22 ES ES95924356T patent/ES2119456T3/es not_active Expired - Lifetime
- 1995-06-22 JP JP8504144A patent/JPH10505716A/ja active Pending
- 1995-06-22 DK DK95924356T patent/DK0769213T3/da active
- 1995-06-22 DE DE69502610T patent/DE69502610T2/de not_active Expired - Fee Related
- 1995-06-22 WO PCT/FR1995/000836 patent/WO1996002073A1/fr active IP Right Grant
- 1995-06-22 CA CA002194470A patent/CA2194470A1/fr not_active Abandoned
- 1995-06-22 EP EP95924356A patent/EP0769213B1/fr not_active Expired - Lifetime
- 1995-06-22 US US08/765,183 patent/US5774026A/en not_active Expired - Fee Related
Non-Patent Citations (3)
Title |
---|
INSTRUMENTS AND EXPERIMENTAL TECHNIQUES., vol. 15, no. 6, Décembre 1972 NEW * |
See also references of WO9602073A1 * |
YORK US, pages 1798-1802, G.I. BRYUKHNEVICH ET AL. 'Matching of the shutter and deflecting systems of a PIM-3 image converter with a control circuit' * |
Also Published As
Publication number | Publication date |
---|---|
FR2722338A1 (fr) | 1996-01-12 |
WO1996002073A1 (fr) | 1996-01-25 |
DE69502610T2 (de) | 1998-11-26 |
CA2194470A1 (fr) | 1996-01-25 |
EP0769213B1 (fr) | 1998-05-20 |
DE69502610D1 (de) | 1998-06-25 |
JPH10505716A (ja) | 1998-06-02 |
ES2119456T3 (es) | 1998-10-01 |
US5774026A (en) | 1998-06-30 |
FR2722338B1 (fr) | 1996-09-13 |
DK0769213T3 (da) | 1999-03-15 |
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