CA2198614C - Rf strip line resonator - Google Patents
Rf strip line resonator Download PDFInfo
- Publication number
- CA2198614C CA2198614C CA002198614A CA2198614A CA2198614C CA 2198614 C CA2198614 C CA 2198614C CA 002198614 A CA002198614 A CA 002198614A CA 2198614 A CA2198614 A CA 2198614A CA 2198614 C CA2198614 C CA 2198614C
- Authority
- CA
- Canada
- Prior art keywords
- strip line
- distance
- resonator
- line resonator
- conductor
- 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.)
- Expired - Fee Related
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P7/00—Resonators of the waveguide type
- H01P7/08—Strip line resonators
- H01P7/082—Microstripline resonators
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P7/00—Resonators of the waveguide type
- H01P7/08—Strip line resonators
- H01P7/084—Triplate line resonators
Landscapes
- Control Of Motors That Do Not Use Commutators (AREA)
- Electroluminescent Light Sources (AREA)
- Surface Acoustic Wave Elements And Circuit Networks Thereof (AREA)
- Reverberation, Karaoke And Other Acoustics (AREA)
- Inductance-Capacitance Distribution Constants And Capacitance-Resistance Oscillators (AREA)
Abstract
RF strip line resonator In order to compensate changes in the resonant frequency of the resonator occurring owing to fluctuations in the distance between the reference distance (d s) and an actual distance (d s~.DELTA.d s) in an RF strip line resonator with a strip line (10) which is arranged at a desired distance (d s) from a metallic conductor (11), the strip line (10) is curved. This curvature induces eddy currents in the conductor (11). The eddy currents bring about a reduction in the inductance of the RF strip line resonator. The smaller/larger the distance between the strip line and the metallic conductor becomes, the smaller/larger this inductance becomes. Since shortening/ lengthening the distance between the two conductors is however also accompanied by an increase/reduction in the capacitance of the RF strip line resonator, with the correct dimensioning of the curved strip line the two aforesaid effects cancel one another out and the frequency of the RF strip line resonator is approximately stable with respect to the given fluctuations in distance.
Description
GR 94 P 1625 P ,i,~' :~ !1~ ~~"ai~ ~.~~.~'s~~~' Description RF strip line resonator The invention relates to an RF strip line resonator according to the preamble of patent claim 1.
RF strip line resonators are required in oscil-latory circuits which are constructed using strip line technology and are required for specific applications. A
significant field of application is, for example, radio-telecommunications technology in which radiotelecommuni-cations are transmitted in the radio wave range. The subdivisions of radiotelecommunicatioas technology which cover the radio wave range are, for example, radio tech-nology, television technology, mobile radio technology and satellite technology.
In mobile radio technology, which is to be considered primarily below, there are a number of mobile radio systems for transmitting telecommunications, which systems differ in terms of (a) the field of application (public mobile radio or non-public mobile radio) (b) the transmission method (FDMA = Frequency Division Multiple Access; TDMA = Time Division Multiple Access;
CDMA = Code Division Multiple Access;), (c) the transmission range (from a few meters up to several kilometers), (d) the frequency range used for the transmission, (800-900 MHz; 1800-1900 MHz).
Examples of this are the public GSM mobile radio system with a transmission range of several kilometers and a frequency range for telecommunications transmission between 800 and 900 MHz (Group Specials Mobile or Global Systems for Mobile Communications; ef. Informatik Spektrum [computing publication], Springer Verlag Berlin, Year 14, 1991, No. 3, pages 137 to 152, A. Mann: °'Der GSM-Standard - Grundlage fur digitale europaische Mobil-funknetze" [The GSM Standard - Basis for digital European mobile radio networks]) and the non-public DECT cordless ,system with a transmission range of several 100 meters and a frequency range for telecommunications transmission between 1880 and 1900 MHz (Digital European Cordless Telecommunication; cf. Nachrichtentechnik Elektronik [Telecoamnunications Electronics] , Berlin, Year 42, No. 1, 1-2/1992, pages 23 to 29, U.Pilger: "Struktur des DECT-Standards" [Structure of the DECT standard]); both use the powerful TDMA transmission method.
The possibility of using RF strip line resonators in mobile radio systems is demonstrated below for the DECT cordless system. In the DECT cordless system which comprises, in the simplest case, a base station with at least one assigned mobile component, high frequency signals are required and processed in radio components with a transmitter/receiver structure.
. Figure 1 shows, for example, the known (publi-cation: ntz, Vol. 46, Issue 10, 1993, pages 754 to 757 -"Architekturen fur ein DECT-Sende- and Empfangsteil: Ein Vergleich" [Architectures for a DECT transmission and reception component: a comparison]), basic structure of a DECT radio component FKT according to the superhetero-dyne principle with double frequency conversion. Mixers MIS which mix a traffic signal (transmission or reception . signal) up or down (raise or lower the frequency of the traffic signal) by mixing with an oscillator signal are used for this frequency conversion. In order to generate the oscillator signal, oscillators OSZl, OSZ2, which have correspondingly constructed resonators for this, are usually used in the radio component FKT. In this context, the resonators used are preferably RF strip line reso-nators.
Figure 2 shows the known structure of an RF strip line resonator 1 which is constructed, for example, as a shortened quarter wave resonator. A quarter wave reso-nator 1 is arranged, for example, on a printed circuit board 2 with a substrate thickness ds (reference dis tance). The quarter wave resonator 1 has a strip line 10 which is directly connected at one end - by means of a through-plated hole DR - and is connected via a capa citor 3 j at the other end, to a metallic conductor 11 - in the present case a metallized conductor surface - which is used here as an earth potential for the strip line 10.
The strip line 10 and the metallic conductor 11 are arranged here on opposite faces of the printed circuit board 2. The strip line 10 has a length 1sT and a width bsT by which, together with the capacitance of the capacitor 3, the method of forming the through-plated hole DK, the substrate thickness ds and the dielectric constant Er of the printed circuit board 2, the resonant frequency of the quarter wave resonator 1 is determined.
By means of the capacitor 3, the strip line resonator 1 is on the one hand adjusted in terms of the resonant frequency and on the other hand shortened in terms of the resonator length 1ST.
Owing to the dependence of the resonant frequency of the strip line resonator 1 on the parameters given above, the actual resonant frequency of the strip line resonator 1 is also determined by how precisely the strip line resonator 1 can be produced, i.e. how large the manufacturing tolerances are. Tolerances (ids) in the substrate thickness d$ or quite generally in the distance between the strip line 10 and the metallic conductor 11 (difference between the reference distance ds and an actual distance dstOds) prove particularly problematic.
This problem is additionally increased if the strip line resonator 1 described above is surrounded by a metallic housing or housing cover and it is also impos-sible - for reasons of manufacture - for this metallic conductor to be arranged at a defined distance from the strip line.
DE-34 24 824 Al and GB-2 222 312 A disclose RF
strip line resonators with curved strip lines which are arranged on a carrier and in which the curved REPLACEMENT PAGE
a - 3a -strip line shape is used to reduce the dimensions of the RF strip line resonator.
The object on which the invention is based is to specify an RF strip line resonator in which changes in the resonant frequency of the resonator which occur owing to tolerances in the construction of the RF
REPLACEMENT PAGE
strip line resonator which are due to production and which influence the distance between the strip line and the metallic conductor are compensated.
In accordance with the present invention, there is provided an RF strip line resonator, having a curved strip line (10) which is arranged at a reference distance (ds) from a conductor (11) characterized in that the strip line (10) is curved and the curvature is dimensioned such that the displacement in the resonant frequency which is capacitively l0 caused as a result of a deviation in distance between an actual distance (ds~~ds) and the reference distance (ds) is counteracted by an approximately equal inverse inductively caused displacement in the resonant frequency.
By virtue of the fact that a strip line of the RF strip line resonator is no longer of stretched, as in the prior art, but is rather of curved construction, eddy currents are induced in a metallic conductor which is located parallel to the strip line and is preferably constructed as a metallic surface. The eddy currents bring about a reduction in the inductance of the RF
strip line resonator. The smaller/larger the distance between the strip line and the metallic conductor becomes, the smaller/larger this inductance becomes. Since the shortening/increasing of the distance between the two conductors is however also accompanied by an increase/reduction in the capacitance of the RF strip line resonator, with appropriate dimensioning of the curved strip line, the two aforesaid effects cancel one another out and the frequency of the RF strip line resonator is approximately stable with respect to the given fluctuations in distance.
Advantageous developments of the invention are specified in the subclaims.
4a An exemplary embodiment of the invention is explained with reference to Figure 3.
Figure 3 shows, on the basis of the RF strip line resonator 1 according to Figure 2, a modified RF strip line resonator la in which the strip line 10 has a curved extent. The curvature ~ is selected here such that when fluctuations in distance occur (reference distance ds and actual distance ds~Ods) between the strip line 10 and the metallic conductor 11, capacitively caused displacements in the resonant frequeacy of the RF strip line resonator la are compensated by approximately equal inverse induc-tively caused displacements in the resonant frequency.
RF strip line resonators are required in oscil-latory circuits which are constructed using strip line technology and are required for specific applications. A
significant field of application is, for example, radio-telecommunications technology in which radiotelecommuni-cations are transmitted in the radio wave range. The subdivisions of radiotelecommunicatioas technology which cover the radio wave range are, for example, radio tech-nology, television technology, mobile radio technology and satellite technology.
In mobile radio technology, which is to be considered primarily below, there are a number of mobile radio systems for transmitting telecommunications, which systems differ in terms of (a) the field of application (public mobile radio or non-public mobile radio) (b) the transmission method (FDMA = Frequency Division Multiple Access; TDMA = Time Division Multiple Access;
CDMA = Code Division Multiple Access;), (c) the transmission range (from a few meters up to several kilometers), (d) the frequency range used for the transmission, (800-900 MHz; 1800-1900 MHz).
Examples of this are the public GSM mobile radio system with a transmission range of several kilometers and a frequency range for telecommunications transmission between 800 and 900 MHz (Group Specials Mobile or Global Systems for Mobile Communications; ef. Informatik Spektrum [computing publication], Springer Verlag Berlin, Year 14, 1991, No. 3, pages 137 to 152, A. Mann: °'Der GSM-Standard - Grundlage fur digitale europaische Mobil-funknetze" [The GSM Standard - Basis for digital European mobile radio networks]) and the non-public DECT cordless ,system with a transmission range of several 100 meters and a frequency range for telecommunications transmission between 1880 and 1900 MHz (Digital European Cordless Telecommunication; cf. Nachrichtentechnik Elektronik [Telecoamnunications Electronics] , Berlin, Year 42, No. 1, 1-2/1992, pages 23 to 29, U.Pilger: "Struktur des DECT-Standards" [Structure of the DECT standard]); both use the powerful TDMA transmission method.
The possibility of using RF strip line resonators in mobile radio systems is demonstrated below for the DECT cordless system. In the DECT cordless system which comprises, in the simplest case, a base station with at least one assigned mobile component, high frequency signals are required and processed in radio components with a transmitter/receiver structure.
. Figure 1 shows, for example, the known (publi-cation: ntz, Vol. 46, Issue 10, 1993, pages 754 to 757 -"Architekturen fur ein DECT-Sende- and Empfangsteil: Ein Vergleich" [Architectures for a DECT transmission and reception component: a comparison]), basic structure of a DECT radio component FKT according to the superhetero-dyne principle with double frequency conversion. Mixers MIS which mix a traffic signal (transmission or reception . signal) up or down (raise or lower the frequency of the traffic signal) by mixing with an oscillator signal are used for this frequency conversion. In order to generate the oscillator signal, oscillators OSZl, OSZ2, which have correspondingly constructed resonators for this, are usually used in the radio component FKT. In this context, the resonators used are preferably RF strip line reso-nators.
Figure 2 shows the known structure of an RF strip line resonator 1 which is constructed, for example, as a shortened quarter wave resonator. A quarter wave reso-nator 1 is arranged, for example, on a printed circuit board 2 with a substrate thickness ds (reference dis tance). The quarter wave resonator 1 has a strip line 10 which is directly connected at one end - by means of a through-plated hole DR - and is connected via a capa citor 3 j at the other end, to a metallic conductor 11 - in the present case a metallized conductor surface - which is used here as an earth potential for the strip line 10.
The strip line 10 and the metallic conductor 11 are arranged here on opposite faces of the printed circuit board 2. The strip line 10 has a length 1sT and a width bsT by which, together with the capacitance of the capacitor 3, the method of forming the through-plated hole DK, the substrate thickness ds and the dielectric constant Er of the printed circuit board 2, the resonant frequency of the quarter wave resonator 1 is determined.
By means of the capacitor 3, the strip line resonator 1 is on the one hand adjusted in terms of the resonant frequency and on the other hand shortened in terms of the resonator length 1ST.
Owing to the dependence of the resonant frequency of the strip line resonator 1 on the parameters given above, the actual resonant frequency of the strip line resonator 1 is also determined by how precisely the strip line resonator 1 can be produced, i.e. how large the manufacturing tolerances are. Tolerances (ids) in the substrate thickness d$ or quite generally in the distance between the strip line 10 and the metallic conductor 11 (difference between the reference distance ds and an actual distance dstOds) prove particularly problematic.
This problem is additionally increased if the strip line resonator 1 described above is surrounded by a metallic housing or housing cover and it is also impos-sible - for reasons of manufacture - for this metallic conductor to be arranged at a defined distance from the strip line.
DE-34 24 824 Al and GB-2 222 312 A disclose RF
strip line resonators with curved strip lines which are arranged on a carrier and in which the curved REPLACEMENT PAGE
a - 3a -strip line shape is used to reduce the dimensions of the RF strip line resonator.
The object on which the invention is based is to specify an RF strip line resonator in which changes in the resonant frequency of the resonator which occur owing to tolerances in the construction of the RF
REPLACEMENT PAGE
strip line resonator which are due to production and which influence the distance between the strip line and the metallic conductor are compensated.
In accordance with the present invention, there is provided an RF strip line resonator, having a curved strip line (10) which is arranged at a reference distance (ds) from a conductor (11) characterized in that the strip line (10) is curved and the curvature is dimensioned such that the displacement in the resonant frequency which is capacitively l0 caused as a result of a deviation in distance between an actual distance (ds~~ds) and the reference distance (ds) is counteracted by an approximately equal inverse inductively caused displacement in the resonant frequency.
By virtue of the fact that a strip line of the RF strip line resonator is no longer of stretched, as in the prior art, but is rather of curved construction, eddy currents are induced in a metallic conductor which is located parallel to the strip line and is preferably constructed as a metallic surface. The eddy currents bring about a reduction in the inductance of the RF
strip line resonator. The smaller/larger the distance between the strip line and the metallic conductor becomes, the smaller/larger this inductance becomes. Since the shortening/increasing of the distance between the two conductors is however also accompanied by an increase/reduction in the capacitance of the RF strip line resonator, with appropriate dimensioning of the curved strip line, the two aforesaid effects cancel one another out and the frequency of the RF strip line resonator is approximately stable with respect to the given fluctuations in distance.
Advantageous developments of the invention are specified in the subclaims.
4a An exemplary embodiment of the invention is explained with reference to Figure 3.
Figure 3 shows, on the basis of the RF strip line resonator 1 according to Figure 2, a modified RF strip line resonator la in which the strip line 10 has a curved extent. The curvature ~ is selected here such that when fluctuations in distance occur (reference distance ds and actual distance ds~Ods) between the strip line 10 and the metallic conductor 11, capacitively caused displacements in the resonant frequeacy of the RF strip line resonator la are compensated by approximately equal inverse induc-tively caused displacements in the resonant frequency.
Claims (7)
1. An RF strip line resonator, having a curved strip line (10) which is arranged at a reference distance (d s) from a conductor (11) characterized in that the strip line (10) is curved and the curvature is dimensioned such that the displacement in the resonant frequency which is capacitively caused as a result of a deviation in distance between an actual distance (d s~.DELTA.d s) and the reference distance (d s) is counteracted by an approximately equal inverse inductively caused displacement in the resonant frequency.
2. The RF strip line resonator as claimed in claim l, characterized in that the strip line (l0) and the conductor (11) are arranged on opposite sides of a printed circuit board (2).
3. The RF strip line resonator as claimed in claim 2, characterized in that the printed circuit board (2) is surrounded by an electrically conductive housing lid.
4. The RF strip line resonator as claimed in claim 2 or 3, characterized in that the conductor (11) is constructed as a metallic surface which is used as earth potential for the strip line (10).
5. A use of the RF strip line resonator as claimed in one of claims l to 4 in a wireless telecommunications device.
6. A use of the RF strip line resonator according to one of claims l to 4 in a DECT cordless telephone.
7. A use of the RF strip line resonator as claimed in one of claims l to 4 in a GSM mobile radiotelephone.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE4430988A DE4430988A1 (en) | 1994-08-31 | 1994-08-31 | HF stripline resonator |
| DEP4430988.0 | 1994-08-31 | ||
| PCT/DE1995/001115 WO1996007214A1 (en) | 1994-08-31 | 1995-08-23 | Hf stripline resonator |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2198614A1 CA2198614A1 (en) | 1996-03-07 |
| CA2198614C true CA2198614C (en) | 2000-04-18 |
Family
ID=6527063
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002198614A Expired - Fee Related CA2198614C (en) | 1994-08-31 | 1995-08-23 | Rf strip line resonator |
Country Status (10)
| Country | Link |
|---|---|
| EP (1) | EP0777919B1 (en) |
| JP (1) | JP2814747B2 (en) |
| CN (1) | CN1090828C (en) |
| AT (1) | ATE167004T1 (en) |
| AU (1) | AU684994B2 (en) |
| CA (1) | CA2198614C (en) |
| DE (2) | DE4430988A1 (en) |
| ES (1) | ES2117436T3 (en) |
| FI (1) | FI970830A (en) |
| WO (1) | WO1996007214A1 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100285018B1 (en) * | 1993-08-27 | 2001-03-15 | 무라따 미치히로 | High frequency electromagnetic field coupling type thin film laminated electrode |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2118309A1 (en) * | 1971-04-15 | 1972-10-19 | Siemens Ag | Method for lowering the resonance frequency of microstrip resonators |
| DE3424824A1 (en) * | 1984-07-06 | 1986-01-16 | Telettra Telefonia Elettronica e Radio S.p.A., Mailand/Milano | Resonant circuit for a circuit for extraction of signals at clock frequency from a data flow |
| US4749963A (en) * | 1985-12-11 | 1988-06-07 | Matsushita Electric Industrial Co., Ltd. | Oscillator having stripline loop resonator |
| GB2260651B (en) * | 1988-08-04 | 1993-06-30 | Matsushita Electric Ind Co Ltd | A resonator and a filter including the same |
| JPH0575316A (en) * | 1991-09-10 | 1993-03-26 | Fujitsu Ltd | Ring resonator |
-
1994
- 1994-08-31 DE DE4430988A patent/DE4430988A1/en not_active Withdrawn
-
1995
- 1995-08-23 WO PCT/DE1995/001115 patent/WO1996007214A1/en active IP Right Grant
- 1995-08-23 AT AT95928965T patent/ATE167004T1/en not_active IP Right Cessation
- 1995-08-23 JP JP8508406A patent/JP2814747B2/en not_active Expired - Fee Related
- 1995-08-23 DE DE59502431T patent/DE59502431D1/en not_active Expired - Fee Related
- 1995-08-23 EP EP95928965A patent/EP0777919B1/en not_active Expired - Lifetime
- 1995-08-23 AU AU32523/95A patent/AU684994B2/en not_active Ceased
- 1995-08-23 CA CA002198614A patent/CA2198614C/en not_active Expired - Fee Related
- 1995-08-23 ES ES95928965T patent/ES2117436T3/en not_active Expired - Lifetime
- 1995-08-23 CN CN95194866A patent/CN1090828C/en not_active Expired - Fee Related
-
1997
- 1997-02-27 FI FI970830A patent/FI970830A/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| FI970830A0 (en) | 1997-02-27 |
| AU684994B2 (en) | 1998-01-08 |
| CN1090828C (en) | 2002-09-11 |
| FI970830A (en) | 1997-02-27 |
| DE59502431D1 (en) | 1998-07-09 |
| AU3252395A (en) | 1996-03-22 |
| CN1157060A (en) | 1997-08-13 |
| ES2117436T3 (en) | 1998-08-01 |
| CA2198614A1 (en) | 1996-03-07 |
| JPH09508779A (en) | 1997-09-02 |
| DE4430988A1 (en) | 1996-03-21 |
| JP2814747B2 (en) | 1998-10-27 |
| WO1996007214A1 (en) | 1996-03-07 |
| ATE167004T1 (en) | 1998-06-15 |
| EP0777919A1 (en) | 1997-06-11 |
| EP0777919B1 (en) | 1998-06-03 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| MKLA | Lapsed |