EP0028403A1 - Tronçon de ligne en dérivation pour l'adaptation de circuits à microbandes - Google Patents

Tronçon de ligne en dérivation pour l'adaptation de circuits à microbandes Download PDF

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Publication number
EP0028403A1
EP0028403A1 EP80106677A EP80106677A EP0028403A1 EP 0028403 A1 EP0028403 A1 EP 0028403A1 EP 80106677 A EP80106677 A EP 80106677A EP 80106677 A EP80106677 A EP 80106677A EP 0028403 A1 EP0028403 A1 EP 0028403A1
Authority
EP
European Patent Office
Prior art keywords
stub
conductive material
line
microstrip
areolae
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.)
Withdrawn
Application number
EP80106677A
Other languages
German (de)
English (en)
Inventor
Antonio Scudellari
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Telecom Italia SpA
Original Assignee
CSELT Centro Studi e Laboratori Telecomunicazioni SpA
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by CSELT Centro Studi e Laboratori Telecomunicazioni SpA filed Critical CSELT Centro Studi e Laboratori Telecomunicazioni SpA
Publication of EP0028403A1 publication Critical patent/EP0028403A1/fr
Withdrawn legal-status Critical Current

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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
    • H01P5/00—Coupling devices of the waveguide type
    • H01P5/02—Coupling devices of the waveguide type with invariable factor of coupling
    • H01P5/022—Transitions between lines of the same kind and shape, but with different dimensions
    • H01P5/028—Transitions between lines of the same kind and shape, but with different dimensions between strip lines

Definitions

  • the present invention relates to microwave circuits implemented by the so called microstrip technology and more particularly it concerns a stub for adjusting microstrip circuits.
  • microstrip stubs One of the fields in which microstrip stubs can be used is the measurements of characteristics of the active components.
  • the inconvenient of the measurement method effected by means of coaxial matching devices resides in that a dismembering must be effected of component holder to measure the unknown impedance.
  • microstrip stubs are generally used is the implementation of amplifiers, oscillators, mixers and others.
  • direct adjustment is generally required of the matching networks, stubs enclosed, to compensate for the unavoidable parameter losses characterizing the active components (as commercially available) and to compensate for possible parassitic parameters of passive circuity.
  • the usually method used for the circuit adjustment consists in removing the conductive material forming the microstrip; said removement is generally obtained through a laser beam, as the required precision in the adjustment is very high.
  • the main inconvenient is that of acting only by removing the material without any recovery, if the removement was too severe.
  • the determination of the optimal condition can be obtained only by verifying worse performances beyond that condition.
  • microstrip stubs of the reversible type that is such as to allow easy scanning about the optimal condition.
  • an adjustment method alternative to the one previously described of laser removement is the one of providing while planning a certain number of areolae of conductive material at the edges of metalized strips of microstrip and duly connecting a certain number to the main strip to the attainment of the required conditions.
  • Another characteristic of the present invention resides in the fact that said slight added redundancy can be positevely utilized by interpreting the stubs realized in that way as elements of abroad band matching network or by sending a polarization through a choke connected to a short-cricuit section of the stub.
  • Fig. 1 shows the typical form of a symmetrical reversible stub; it consists of two cascaded lines, the fist, connected to main line L, has'high characteristic impedance, and the second, left in open circuit, has low characteristic impedance.
  • references w 1 , 1 1 denote respectively the width and the length of the first line prior to adjustment; references w 2 , 1 2 denote respectively the analogous values of the second line prior to adjustement.
  • Reference 1" 3 denotes the lengthening of the second line at the open end; reference 1' 3 denotes the lengtheing of the second line at the end of the connection with the first line, that then corresponds also to a shortening of the first line.
  • Reference w' 2 denotes the widening of the microstrip relating to the second line.
  • References a, b, c denote some areolae placed in adwance while planning the microstrip in suitable number and size, to carry out the required adjustments.
  • References Y 1 , 1 1 denote the characteristic admithance and the length of the first line wi, 1 1 prior to adjustement; references Y 2 , 1 2 denote the analogous values of the second line w 2 , 1 2 always before adjustement.
  • Reference a denotes the same anolae as in Fig. 1; reference c' denotes the areolae that correspond, in the asymmetric version, to those denoted by a in the symmetric version of Fig. 1.
  • References 1' 4 , 1" 4 denote areas of conductive material that can be partially or totally removed to realize the wonted adjustments.
  • Fig. 5 the originary configuration of the microstrip is the same as in Fig. 1; the dotted lines denoted by d, e, f, represent areas of conductive material that can be removed while adjusting.
  • References 1 1 , 1 2 , w 1 , w 2 denote the same values as in in Fig. 1.
  • Fig. 6 references a, b, c denote the same areolae as in Fig. 1, but this time during the planning they have not been plotted outside of (as they have in Fig.1), but they have been plotted inside the original configuration of the microstrip and have been subsequently covered with conductive material (dotted zone) easy to remove, for instance by a sharpened stylus.
  • References 1 1 , 1 2 , w 1 w 2 denote the same values as in Fig. 1.
  • the initial equivalent circuit is the one of Fig. 2.
  • length 1 2 is increased by an entity that, for instance, in case the two first areolae of type a were incorporated is equal to 1" 3 , i. e. passing from length 1 2 , to 1 2 + 1" 3 .
  • width w 2 increases; in case for instance both areolae b represented in Fig. 1 were incorporated one would pass from width w 2 to w' 2 : characteristic admittance Y 2 of Fig. 2 increases accordingly.
  • length 1 2 increases, for instance in the case depicted in Fig. 1, by1' 3 and 1 1 diminishes by the same value.
  • a single transmission line in open circuit used in shunt (that is a stub) can be converted into a reversible line (that is into a line that can be lengthened or shortened by the same method of adjustment no matter whether it consists of the addition or of the removement of conductive material) if said line is replaced by the cascaded connection of two different transmission lines, the second of which has a length 1 2 comprised between ⁇ /4 and ⁇ /2 ( ⁇ /4 ⁇ 1 2 ⁇ ⁇ /2); the length 1 1 of the first line is free and depends on the initial value positive or negative of B that is to be realized.
  • the operating modalities of the stub of Fig. 6 are strictly analogous to those of Fig. 5; however in this case while designing the microstrip initial areolae a, b, c are to be prearranged (as in Fig. 1) that must be covered with conductive material of the soft type that is easy to remove.
  • the methodology described here is based on the replacement of a single line by a cascade of two lines and then by the introduction of a redundancy.
  • Such redundancy can be usefully employed also, to send the polarization to active devices or to match loads on wide band.
  • the second line (1 2 , w 2 ) is a line with low characteristic impedance and has a length comprised between ⁇ /4 and ⁇ /2. Therefore an intermediate position exists (corresponding to ⁇ /4) in which a short circuit at radio frequency is present with broad band due to the low impedance characteristic of the line.
  • This short circuit section can be utilized to insert a choke to send polarization voltage.

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EP80106677A 1979-11-05 1980-10-31 Tronçon de ligne en dérivation pour l'adaptation de circuits à microbandes Withdrawn EP0028403A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT69148/79A IT1119942B (it) 1979-11-05 1979-11-05 Linea di trasmissione derivata per l'adattamento di circuiti a micro striscia
IT6914879 1979-11-05

Publications (1)

Publication Number Publication Date
EP0028403A1 true EP0028403A1 (fr) 1981-05-13

Family

ID=11311444

Family Applications (1)

Application Number Title Priority Date Filing Date
EP80106677A Withdrawn EP0028403A1 (fr) 1979-11-05 1980-10-31 Tronçon de ligne en dérivation pour l'adaptation de circuits à microbandes

Country Status (2)

Country Link
EP (1) EP0028403A1 (fr)
IT (1) IT1119942B (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2560442A1 (fr) * 1984-02-24 1985-08-30 Thomson Csf Dispositif de commutation et de limitation a ligne a fente, fonctionnant en hyperfrequences
EP0324512A2 (fr) * 1982-05-10 1989-07-19 Oki Electric Industry Company, Limited Filtre diélectrique
DE4135555A1 (de) * 1991-10-29 1993-05-06 Ant Nachrichtentechnik Gmbh, 7150 Backnang, De Verfahren zur bestimmung von s-parametern eines messobjekts sowie verwendung

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2819452A (en) * 1952-05-08 1958-01-07 Itt Microwave filters
US2820206A (en) * 1952-05-08 1958-01-14 Itt Microwave filters
FR1212982A (fr) * 1958-10-21 1960-03-28 Csf Filtre passe-bande d'ultra-haute fréquence
US3417352A (en) * 1964-12-21 1968-12-17 Northern Electric Co Corona reduction on printed circuit tuning stubs
DE2310371A1 (de) * 1973-03-02 1974-09-26 Licentia Gmbh Breitbandiger leitungsuebertrager zur transformation von wellenwiderstaenden bei sehr hohen frequenzen
US4070639A (en) * 1976-12-30 1978-01-24 International Telephone And Telegraph Corporation Microwave 180° phase-bit device with integral loop transition
US4105959A (en) * 1977-06-29 1978-08-08 Rca Corporation Amplitude balanced diode phase shifter
US4157517A (en) * 1977-12-19 1979-06-05 Motorola, Inc. Adjustable transmission line filter and method of constructing same

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2819452A (en) * 1952-05-08 1958-01-07 Itt Microwave filters
US2820206A (en) * 1952-05-08 1958-01-14 Itt Microwave filters
FR1212982A (fr) * 1958-10-21 1960-03-28 Csf Filtre passe-bande d'ultra-haute fréquence
US3417352A (en) * 1964-12-21 1968-12-17 Northern Electric Co Corona reduction on printed circuit tuning stubs
DE2310371A1 (de) * 1973-03-02 1974-09-26 Licentia Gmbh Breitbandiger leitungsuebertrager zur transformation von wellenwiderstaenden bei sehr hohen frequenzen
US4070639A (en) * 1976-12-30 1978-01-24 International Telephone And Telegraph Corporation Microwave 180° phase-bit device with integral loop transition
US4105959A (en) * 1977-06-29 1978-08-08 Rca Corporation Amplitude balanced diode phase shifter
US4157517A (en) * 1977-12-19 1979-06-05 Motorola, Inc. Adjustable transmission line filter and method of constructing same

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES, Vol. MTT-19, No. 7, July 1971 New York (US) M. CAULTON et al.: "Status of Lumped Elements in Microwave Integrated Circuits - Present and Future" pages 588 to 599 * The whole document * *

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0324512A2 (fr) * 1982-05-10 1989-07-19 Oki Electric Industry Company, Limited Filtre diélectrique
EP0324512A3 (en) * 1982-05-10 1989-07-26 Oki Electric Industry Company, Limited A dielectric filter
FR2560442A1 (fr) * 1984-02-24 1985-08-30 Thomson Csf Dispositif de commutation et de limitation a ligne a fente, fonctionnant en hyperfrequences
EP0154583A1 (fr) * 1984-02-24 1985-09-11 Thomson-Csf Dispositif de commutation et de limitation à ligne à fente, fonctionnant en hyperfréquences
US4642584A (en) * 1984-02-24 1987-02-10 Thomson-Csf Slot-line switching and limiting device for operation at microwave frequencies
DE4135555A1 (de) * 1991-10-29 1993-05-06 Ant Nachrichtentechnik Gmbh, 7150 Backnang, De Verfahren zur bestimmung von s-parametern eines messobjekts sowie verwendung

Also Published As

Publication number Publication date
IT7969148A0 (it) 1979-11-05
IT1119942B (it) 1986-03-19

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PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

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Effective date: 19810526

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Effective date: 19821207

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Inventor name: SCUDELLARI, ANTONIO