EP1741158A1 - Impedance transformer - Google Patents
Impedance transformerInfo
- Publication number
- EP1741158A1 EP1741158A1 EP05738431A EP05738431A EP1741158A1 EP 1741158 A1 EP1741158 A1 EP 1741158A1 EP 05738431 A EP05738431 A EP 05738431A EP 05738431 A EP05738431 A EP 05738431A EP 1741158 A1 EP1741158 A1 EP 1741158A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- web
- outer conductor
- inner conductor
- conductor
- dielectric
- 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
- H01P5/02—Coupling devices of the waveguide type with invariable factor of coupling
Definitions
- the invention relates to an impedance converter device according to the preamble of claim 1.
- Impedance converters are used today in particular in antenna arrangements for transforming impedances.
- the impedance converters are used to create individual radiator elements or antenna components, e.g. Phase shifters, filters, bandpasses, resulting broadband impedances to adapt to a common system impedance, which is 50 ohms in the mobile radio range.
- Impedance converters are known from the prior art, in which an impedance conversion is carried out by means of a ⁇ / 4 transformation by interposing coaxial cables between connections in the antenna arrangement that have a length that corresponds to a quarter of the wavelength of the high frequency. with which the antenna arrangement is operated. It proves to be disadvantageous here that a large number of solder points at the ends for the interposition of coaxial cables the coaxial cable has to be attached, so that the production of such impedance converters is expensive and, due to the variety of parts, also has a high tolerance. Tuning screws for changing the impedance in coaxial elements are also known from the prior art. This type of impedance conversion is also comparatively expensive.
- impedance transformations are carried out by means of impedance converters in the form of strip conductors on circuit boards. It is disadvantageous here that these impedance converters are only permissible for limited high-frequency outputs and that subsequent adjustment of the impedance is not possible, and intermodulation problems can also be expected.
- the impedance converter device is characterized by a special shape of an outer conductor, an inner conductor and a dielectric located in between.
- the outer conductor of the device comprises a base area which is delimited by one or more side walls, as a result of which an outer conductor housing is formed with an interior space and an opening opposite the base area.
- the inner conductor is arranged in the interior, the inner conductor and the outer conductor being insulated from one another by the dielectric.
- the Inner conductor comprises at least one web-shaped section with a web base and at least one web wall which extends from the web base in the direction of the opening of the outer conductor housing.
- the configuration of the outer conductor as an open housing enables access to the inner conductor, in particular to the web walls of the web-shaped sections.
- the angle of these web walls can be adjusted by means of a corresponding tool, as a result of which an operator can easily adjust the impedance without intermodulation problems or deterioration of the intermodulation properties.
- the opening can be closed by a suitable closure device.
- the housing on the side opposite the base surface is not formed in one piece with all side walls of the housing, so that an opening (which may also be closed) can always be located in the impedance converter.
- Another advantage of the impedance converter according to the invention is that the outer conductor housing can be used universally and only the easily accessible inner conductor has to be exchanged in order to change the transformation properties of the impedance converter. Due to the height achieved through the outer conductor housing, there is no unwanted radiation from the converter. The converter can also be used for very high high-frequency outputs.
- the impedance converter preferably extends in a longitudinal direction between at least two opposite connection points. Furthermore, at least one web bottom of a web-shaped inner conductor section is assigned at least two web walls, which extend in the direction of Extend the opening of the outer conductor housing in particular from the edges of the web base.
- the web walls assigned to a web floor are in particular parallel to one another. In one embodiment, the web walls assigned to a web floor converge or diverge in a sectional view along a plane parallel to the base area of the outer conductor in the longitudinal direction of the impedance converter. Alternatively, the web walls assigned to a web floor are parallel to one another. Furthermore, the web walls assigned to a web floor can generally stand vertically on the web floor. Alternatively, in a sectional view, the web walls assigned to a web floor diverge or converge along a plane perpendicular to the longitudinal direction of the impedance converter in the direction of the opening of the outer conductor housing.
- the outer conductor comprises a stamped, one-piece metal sheet with bent side walls.
- the inner conductor is preferably also a stamped, one-piece metal sheet with bent web walls. In this way, on the one hand, an inexpensive manufacture of the inner conductor is achieved and, on the other hand, good flexibility of the web walls is ensured, so that the impedance can be easily tuned or changed by bending the web walls.
- the dielectric is a component with a receptacle, the component being used in the interior of the outer conductor housing and the inner conductor being arranged in the receptacle of the component. is not.
- electrical isolation between the inner conductor and outer conductor is achieved in a simple manner by means of a separate component.
- the component is preferably formed in one piece.
- the component is held in the outer conductor housing by a force fit, in particular by a clamp, and / or by a form fit and / or by a material fit.
- the inner conductor can be held in the receptacle of the dielectric by non-positive connection, in particular by clamping, and / or by positive connection and / or by material connection.
- non-positive connection in particular by clamping, and / or by positive connection and / or by material connection.
- the inner conductor has at its ends end sections with at least one or a plurality of end faces which extend in the direction of the opening of the outer conductor housing. With the help of these end sections, the position of the inner conductor can be fixed in the outer conductor housing. When combining these .
- the dielectric is a component with a receptacle, one or more corners of the receptacle are preferably rounded and accommodate edges of the end sections of the inner conductor.
- the inner conductor has at least one first web-shaped section for impedance transformation.
- the first web-shaped section here preferably has a length that is 1/4 of the wavelength of a high frequency that is used for mobile radio transmission, in particular especially a high frequency in a GSM network and / or UMTS network.
- the length is preferably matched to the center frequency to be transmitted.
- the inner conductor has at least one second web-shaped section for adapting the length of the inner conductor.
- the second web-shaped section ensures that the length of the inner conductor is always the same, regardless of the high frequencies used, so that the inner conductor can always be used in an identically constructed outer conductor housing.
- connection points are provided in the outer conductor and in the inner conductor, which preferably comprise openings at the ends of the outer conductor and the inner conductor.
- Each opening of the outer conductor is preferably aligned with an opening of the inner conductor, the aligned openings being connected to one another by an opening in the dielectric.
- the openings of the outer conductor and the inner conductor preferably serve to receive and then solder coaxial cables, the openings of the outer conductor serving to receive a coaxial outer conductor and the openings of the inner conductor serving to receive a coaxial inner conductor.
- the openings of the di electricals are preferably each received in recesses, which are used in particular to receive an insulation arranged between a coaxial outer conductor and a coaxial inner conductor.
- the openings of the outer conductor can comprise at least one shoulder, which is used in particular for the stop for one end of a coaxial outer conductor.
- coaxial cables are soldered to the openings of the outer conductor and the inner conductor by means of solder paste and / or integrated molded soldering parts. This enables automated and inexpensive soldering of the coaxial cables to the impedance converter.
- the dielectric used in the impedance converter according to the invention can include air, which means that the inner and outer conductors of the impedance converter are spaced apart from one another by additional spacing means.
- the inner conductor is designed in a fan-like manner with a plurality of web-shaped sections arranged in parallel.
- the device can be interconnected with several different systems. To fix the web-shaped sections, they are each arranged in a recess in the dielectric.
- Figure 1 is a perspective view of an impedance converter according to a first embodiment of the invention
- Figure la a perspective view of a preferred embodiment of an outer conductor used in the impedance converter according to the invention.
- FIG. 2 shows a perspective view of the impedance converter of FIG. 1 rotated by 180 ° with respect to FIG. 1;
- Figure 3 is a top view of the impedance converter of Figure 1;
- Figure 4 is a sectional view of the impedance converter of Figure 3 along the line I-I;
- FIG. 5 shows a perspective view of a second embodiment of an impedance converter according to the invention.
- FIG. 6 shows a perspective view of the impedance converter of FIG. 5 rotated by 180 ° compared to FIG. 5;
- Figure 7 is a top view of the impedance converter of Figure 6;
- Figure 8 is a sectional view of the impedance converter of Figure 7 along the line II-II.
- Figure 1 and Figure 2 show perspective views of a first embodiment of an impedance converter according to the invention.
- the converter comprises an outer conductor in the form of an outer elongated metal housing 1, the housing being open at the top and consisting of a stamped metal sheet.
- the housing is essentially rectangular and has a base area la (not shown in FIG. 1 and FIG. 2) and side walls 1b, 1c, 1d and 1e.
- the outer conductor 1 is preferably a sheet metal part, the side walls of which are upwardly bent sections of the sheet metal part. The edges of the individual side walls are spaced apart from one another by narrow spaces Z.
- the dielectric 3 can be clamped tightly via the curved side walls.
- the dielectric is also open at the top and an inner conductor 2 is used in its interior.
- This inner conductor has end sections 2c ' and 2d, which. each comprise side walls 24, 25, 2 " 6 and 27, 28, 29. The end sections are inserted into the dielectric 3 via rounded corners 3a, 3b, 3c and 3d.
- the inner conductor 2 has a length so that it is in the interior of the dielectric 3 is clamped over the end sections 2c and 2d, the inner conductor comprises between the end sections 2c and 2d two interconnected web-shaped sections 2a and 2b.
- the first web-shaped section 2a comprises a web base 21 and two web walls 22 and which extend vertically upwards 23.
- the second web-shaped section 2b comprises a web base 21 '(and not visible in FIGS. 1 and 2) and web walls 22' and 23 '.
- the inner conductor is preferred formed as a one-piece metal sheet, the shape of the side walls of the end section and the web-shaped sections first being punched out in the metal sheet and then the side walls and web walls being bent upwards.
- stamped sheets for the outer conductor and the inner conductor ensures inexpensive and simple manufacture of the impedance converter.
- the transformation impedance can be set with the width of the web-shaped sections 2a, 2b and the corresponding bent web walls or with the height of the web-shaped sections above the outer conductor base (distance through dielectric).
- the first web-shaped section 2a is used to transform the impedance when the impedance converter is soldered in an antenna arrangement between coaxial cables.
- the length of the first web-shaped section 2a is 0 1/4 of a wavelength ⁇ , as a result of which a ⁇ / 4 transformation is carried out, where ⁇ corresponds to the wavelength of the high frequency with which the corresponding antenna arrangement is operated.
- ⁇ corresponds to the wavelength of the high frequency with which the corresponding antenna arrangement is operated.
- These are preferably the common mobile radio frequencies, such as 900 or
- the second web-shaped section 2b of the impedance converter is used primarily for length correction. That is, the length of the second web-shaped section is dependent on the length of the first web-shaped section
- the inner conductor 2 has the great advantage that its impedance can be adapted or changed by bending the web walls of the first web-shaped section 2a. This is particularly advantageous in the manufacture of the impedance converter, since at the end of the manufacturing process any tolerances in the impedance can be compensated for by bending the web walls 22 or 23. If necessary, the second web-shaped section can also be designed such that it likewise influences the impedance, so that the web walls 22 'are also bent. or 23 'the impedance of the converter can be changed.
- the outer conductor 1 of the impedance converter has a cylindrical opening 101 in the side surface le and two interconnected cylindrical openings 102 and 103 in the side surface 1c. These openings are connected via corresponding cylindrical openings 301, 302 and 303 in the dielectric 3 to smaller cylindrical openings 201, 202 and 203 in the end sections 2c and 2d.
- the openings in the outer conductor and in the inner conductor serve for connection to a coaxial cable, the openings of the outer conductor serving to receive a coaxial outer conductor and the corresponding openings in the inner conductor serving to receive the corresponding coaxial inner conductor.
- the conductors are soldered to the openings to fix the coaxial conductors of the cable.
- solder for the coaxial outer conductor and 2 solder for the coaxial inner conductor are attached to the outer sides of the side walls lc and le of the housing and in the end sections 2c and 2d of the inner conductor.
- Integrated soldering parts or solder paste allow the inner and outer conductor soldering between the impedance converter and the coaxial cables to be carried out (eg induction soldering).
- induction soldering e.g., induction soldering.
- the height of the impedance converter avoids radiation which occurs, for example, in the case of impedance converters in the form of strip conductors on circuit boards.
- FIG. 3 shows a top view of the impedance converter from FIG. 1 or FIG. 2. It can be seen in particular from FIG. 3 that the web base 21 of the first web-shaped section 2a is wider than the web base 21 'of the second web-shaped section 2b. Furthermore, the length of the second web-shaped section is less than the length of the first web-shaped section. The reduced design of the second web-shaped section means that this section has little or no influence on the impedance of the converter. From FIG. 3 it can also be seen that the web walls 22 and 23 and 22 'and 23' of the web-shaped sections are easily accessible from above, so that an operator can readjust or adjust the impedance if necessary by bending the web walls.
- FIG. 4 shows a sectional view along line II of FIG. 3, the position of coaxial cables which are connected to the impedance converter being indicated by dashed lines. Furthermore, the cross section of the outer conductor housing 1 is indicated with a single hatching, whereas the cross section of the dielectric 3 is shown with a double hatching.
- the diameters are shown in particular in FIG the openings 101 and 103 in the outer conductor housing, the openings 301 and 303 in the dielectric and the openings 201 and 203 in the inner conductor housing.
- the opening 103 has the largest diameter of the openings 103, 203 and 303, it being used to receive a coaxial outer conductor 51 of a coaxial cable 5.
- the coaxial outer conductor used abuts a circumferential shoulder S in the opening 103.
- the opening 303 has a smaller diameter than the opening 103 and serves to receive insulation 53 of the coaxial cable 5.
- the opening 203 has the smallest diameter and serves to receive the coaxial inner conductor 52 of the coaxial cable 5.
- the coaxial outer conductor 51 is soldered on attached to the outside of the side wall lc.
- the coaxial inner conductor 52 is soldered to the inside of the side wall 25.
- the openings 101, 201 and 301 in the area of the side wall le. are designed for a larger or low-damping coaxial cable 5 '.
- the opening 101 Analogous to the opening 103, the opening 101 has a corresponding shoulder S 'against which one end of a coaxial outer conductor 51' abuts.
- the opening 301 is smaller than the opening 101 and it is arranged in a cylindrical recess A in the dielectric 3, the recess being chosen such that the insulation 53 'of the coaxial cable 5' can be accommodated therein.
- the size of the opening 201 in the inner conductor 2 essentially corresponds to the size of the opening 301 in the dielectric 3, the diameter of the openings being chosen such that the coaxial inner conductor 52 'of the coaxial cable 5' fits through the openings.
- the coaxial inner conductor 52 ' is on the inside of the side wall 28 and the coaxial outer conductor 51' is on the outside of the side wand le soldered. If, for example, two coaxial cables, each with an impedance of 50 ohms, are used via the openings 102 and 103, an input impedance of 25 ohms results at this point.
- the impedance of the impedance converter must be set to 35 ohms, so that an impedance of 50 ohms again results at the opposite opening 101.
- the impedance of the impedance converter must be set to 35 ohms, so that an impedance of 50 ohms again results at the opposite opening 101.
- FIGS. 5 and 6 show two perspective views of a second embodiment of an impedance converter, the view in FIG. 6 being rotated by 180 ° with respect to the view in FIG.
- the inner conductor 2 of the impedance converter is designed in the form of a fan, wherein instead of a single first web-shaped section, three web-shaped sections 2a, 2a 'and 2a "arranged parallel to one another are provided. However, only two or more of these can also be used
- the web-shaped sections are connected to the second web-shaped section 2b via a transverse web 2e. Openings 102, 103 and 102 ', 103' are connected to the three first web-shaped sections with corresponding coaxial cables. or 102 ", 103" in the outer conductor 1.
- each web-shaped section 2a, 2a 'or 2a "opens into separate end sections 2c, 2c' or 2c", as can be seen in particular from FIG An end section 2d on the side of the web-shaped section 2b, all openings in the outer conductor 1 are analogous to the previous embodiment with corresponding openings in the dielectric and in the inner conductor.
- Appropriate receptacles for the end sections 2c, 2c ', 2c "and 2d are provided in the interior of the dielectric for fastening the inner conductor. These receptacles are formed by cuboid projections 31, 32, 33 and 34 on the inside of the dielectric the inner conductor is fixed in the dielectric.
- FIG. 7 shows a plan view of the impedance converter of FIG. 5 or of FIG. 6.
- the structure of the inner conductor is shown in FIG. 7 in particular. It can be seen that the three parallel web-shaped sections 2a, 2a 'and 2a "are configured identically and have a greater width than the web-shaped section 2b. However, the web-shaped sections can also be of different widths in order to achieve a desired power distribution.
- FIG. 8 shows a sectional view along the line II-II of FIG. 7.
- the structure . 8 is essentially identical to the construction of the converter of FIG. 4, the same components being identified by the same reference numerals. A detailed description of the structure of FIG. 8 is therefore dispensed with and reference is made to FIG. 4 in this regard.
- the arrangement of the openings 103, 203 and 103 in the region of the end section 2c is shown on the left side of the impedance converter of FIG. 8, the arrangement of the openings in the corresponding end sections 2c 'and 2c "being identical the opening 103 has a shoulder S for receiving the coaxial outer conductor 51.
- a shoulder S ' is provided in the opening 101 on the opposite right side of the converter, and the opening 301 is arranged in a recess A which is used to receive the insulation 53'
- the outer and inner conductors of the coaxial cables are soldered to the outer and inner conductors of the impedance converter.
Landscapes
- Waveguide Aerials (AREA)
- Details Of Connecting Devices For Male And Female Coupling (AREA)
- Coupling Device And Connection With Printed Circuit (AREA)
- Waveguides (AREA)
- Coils Or Transformers For Communication (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE200410021086 DE102004021086A1 (en) | 2004-04-29 | 2004-04-29 | Impedance converting device |
PCT/EP2005/004590 WO2005107005A1 (en) | 2004-04-29 | 2005-04-28 | Impedance transformer |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1741158A1 true EP1741158A1 (en) | 2007-01-10 |
EP1741158B1 EP1741158B1 (en) | 2008-12-31 |
Family
ID=34966621
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP05738431A Expired - Fee Related EP1741158B1 (en) | 2004-04-29 | 2005-04-28 | Impedance transformer |
Country Status (6)
Country | Link |
---|---|
EP (1) | EP1741158B1 (en) |
CN (1) | CN2807499Y (en) |
DE (2) | DE102004021086A1 (en) |
ES (1) | ES2318482T3 (en) |
TW (1) | TWI335102B (en) |
WO (1) | WO2005107005A1 (en) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP4631965B2 (en) * | 2008-12-18 | 2011-02-16 | ミツミ電機株式会社 | Antenna amplifier |
CN105186253A (en) * | 2015-08-20 | 2015-12-23 | 京信通信技术(广州)有限公司 | Implementation method, application method and connection structure for welding tin-solderable conductor and tin-unsolderable matrix |
CN116208239B (en) * | 2023-05-06 | 2023-06-30 | 北京安天网络安全技术有限公司 | Signal receiving circuit |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB591667A (en) * | 1942-03-31 | 1947-08-25 | Sperry Gyroscope Co Inc | Improvements in or relating to impedance transformers for wave guides |
US2767380A (en) * | 1952-09-30 | 1956-10-16 | Bell Telephone Labor Inc | Impedance transformer |
US3063027A (en) * | 1955-02-14 | 1962-11-06 | Hughes Aircraft Co | High power microwave isolator |
GB1095103A (en) * | 1966-03-25 | 1967-12-13 | Mullard Ltd | Variable-impedance transmission-line device |
DE3811985A1 (en) * | 1988-04-11 | 1989-10-19 | Siemens Ag | ARRANGEMENT FOR IMPEDANCE TRANSFER |
DE69131660T2 (en) * | 1990-07-30 | 2000-04-06 | Sony Corp. | Adaptation device for a microstrip antenna |
JP3378808B2 (en) * | 1997-09-18 | 2003-02-17 | ジョンズテック インターナショナル コーポレイション | Expansion core connector |
DE10217387B4 (en) * | 2002-04-18 | 2018-04-12 | Snaptrack, Inc. | Electrical matching network with a transformation line |
-
2004
- 2004-04-29 DE DE200410021086 patent/DE102004021086A1/en not_active Withdrawn
- 2004-07-13 CN CNU2004200059789U patent/CN2807499Y/en not_active Expired - Lifetime
- 2004-09-21 TW TW93128503A patent/TWI335102B/en not_active IP Right Cessation
-
2005
- 2005-04-28 ES ES05738431T patent/ES2318482T3/en active Active
- 2005-04-28 EP EP05738431A patent/EP1741158B1/en not_active Expired - Fee Related
- 2005-04-28 WO PCT/EP2005/004590 patent/WO2005107005A1/en not_active Application Discontinuation
- 2005-04-28 DE DE502005006382T patent/DE502005006382D1/en active Active
Non-Patent Citations (1)
Title |
---|
See references of WO2005107005A1 * |
Also Published As
Publication number | Publication date |
---|---|
CN2807499Y (en) | 2006-08-16 |
WO2005107005A8 (en) | 2006-01-12 |
WO2005107005A1 (en) | 2005-11-10 |
TWI335102B (en) | 2010-12-21 |
ES2318482T3 (en) | 2009-05-01 |
EP1741158B1 (en) | 2008-12-31 |
DE102004021086A1 (en) | 2005-11-24 |
TW200536173A (en) | 2005-11-01 |
DE502005006382D1 (en) | 2009-02-12 |
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