EP0281773A1 - Abstimmbares Mikrowellenfilter - Google Patents

Abstimmbares Mikrowellenfilter Download PDF

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Publication number
EP0281773A1
EP0281773A1 EP88101782A EP88101782A EP0281773A1 EP 0281773 A1 EP0281773 A1 EP 0281773A1 EP 88101782 A EP88101782 A EP 88101782A EP 88101782 A EP88101782 A EP 88101782A EP 0281773 A1 EP0281773 A1 EP 0281773A1
Authority
EP
European Patent Office
Prior art keywords
filter
microstrip line
diode
variable
ground
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
Application number
EP88101782A
Other languages
English (en)
French (fr)
Other versions
EP0281773B1 (de
Inventor
Mustafa Gurcan
Maurice Bernard
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.)
Alcatel CIT SA
Original Assignee
Alcatel Thomson Faisceaux Hertziens SA
Alcatel Telspace SA
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 Alcatel Thomson Faisceaux Hertziens SA, Alcatel Telspace SA filed Critical Alcatel Thomson Faisceaux Hertziens SA
Publication of EP0281773A1 publication Critical patent/EP0281773A1/de
Application granted granted Critical
Publication of EP0281773B1 publication Critical patent/EP0281773B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • H01P1/00—Auxiliary devices
    • H01P1/20—Frequency-selective devices, e.g. filters
    • H01P1/201—Filters for transverse electromagnetic waves
    • H01P1/203—Strip line filters

Definitions

  • the present invention relates to a tunable filter, in particular in the band from 800 to 1800 MHz.
  • the signal received at the antenna of the earth station is in the bands 10.95-11.7 GHz or 12.25-12.75 GHz or 11.7-12.5 GHz etc ...
  • a first stage transposes these bands to the RF (radio frequency) bands 950-1700 MHz, 950-1450 MHz, 950-1750 MHz, respectively.
  • a second transposition brings these frequencies around an intermediate frequency, or IF, of a few hundred MHz; for example 450 MHz.
  • Each channel in the radio frequency band, or RF is a few tens of MHz wide.
  • the role of the tunable filter is to transmit only the channel chosen in the total RF input band.
  • the rejection of the local oscillator frequency, or OL, of the last transposition, of the image frequencies and of the products of mixtures are markedly improved.
  • the document EP-0138438 describes a tunable microwave filter which comprises two branches of the same type which, at each end, are connected to ground and which each comprise, connected in series, a fixed inductance, a first adjustable inductance, a first diode with variable capacitance, a filter for high frequencies formed by a series resonance circuit comprising a second diode with variable capacitance and a second variable inductance, and a coupling element comprising a series inductance between the input point and the output point of the filter.
  • the object of the invention is to overcome this drawback.
  • a tunable microwave filter comprising two branches of the same type which, at each end, are connected to ground and which each comprise in series a first and a second variable capacity diodes controlled by a neck signal continuous rant, said filter being disposed on the first face of a planar substrate, characterized in that each branch comprises in series a microstrip line disposed between the second diode and the first end, and in that the inlet and the microwave output are connected to the common points between the microstrip line and the second variable capacity diode of the first and second branches respectively by a symmetrical adapter.
  • Such a filter has the great advantage of being able to be easily produced in a reproducible manner and therefore of allowing automatic mounting.
  • the cost of receiving such a filter is therefore very low; It can therefore be used in the case of reception for satellite links, intended for a large audience.
  • the filter of the invention is produced on a substrate, the second face of which is completely metallized and forms a ground plane, the ground points of the filter being produced by metallized holes.
  • the filter of the invention is such that the DC voltage supply for each branch is produced by means of an RC filter, this DC voltage supply being connected to the common point of the two variable capacity diodes by a microstrip line of length (2k + 1) ⁇ / 4 and by the resistance of the RC filter, and at the end to ground of the first variable-capacity diode by the capacity of the RC filter; a microstrip line of length (2k ⁇ + 1) ⁇ / 4 connecting the two branches to the DC voltage source.
  • variable capacitance diodes are arranged in holes drilled in the substrate; which allows for great positioning accuracy.
  • This figure represents a substrate 8 on the first face 9 of which is the filter of the invention.
  • This consists of two symmetrical parts or branches 10 (10A) with respect to an axis ⁇ located on the face 9 of this substrate 8.
  • Each part (10, 10A) of the filter of the invention comprises: a line 11 (11A) of direction parallel to the axis ⁇ produced by metallization on the surface of the substrate; - two variable capacity diodes, or varicaps, 12, 13 (12A, 13A) in series, arranged between line 11 (11A) and earth 24; a line 14 (14A) of length (2k + 1) ⁇ / 4, ⁇ being the wavelength of the microwave signal considered, connected to a DC source V which makes it possible to reverse polarize the two varicaps 12, 13 (12A , 13A) via a resistor 15 (15A) and an insulation capacity 16 (16A); - a 50 ⁇ adaptation line 17 (17A) connected to the common point between line 11 (11A) and the first varicap 12 (12A) via a symmetrical adapter 18, 19 (18A, 19A) formed by two symmetrical stubs 18 (18A) parallel to the main arm 19 (19A).
  • This adaptation line 17 (17A) constitutes in the first part (10), the input to which the microwave signal E is connected. It constitutes for the second part (10A) the output on which the microwave signal S is obtained in output of the inventive filter.
  • the two lines 11 and 11A of the two parts 10 and 10A of the filter of the invention are coupled together and connected at their end by a section of line 20 itself connected to the ground 22.
  • the midpoint of the two varicaps 12A and 13A of the second part is connected to the DC voltage source V via a line 21 of length (2k ⁇ + 1) .
  • the substrate is completely metallized on its second face.
  • the ground points are therefore metallized holes 22 and 24.
  • Varicaps 12 (12A) and 13 (13A) are arranged in positioning holes 22 (22A) and 23 (23A).
  • the structure of the filter of the invention is produced in microstrip technique and the substrate used is for example made of epoxy glass; which is a factor in reducing the cost price.
  • the filter is tuned by modifying the DC voltage V applied to varicaps 22, 23, 22A and 23A. These varicaps are for example therefore cheaper than varicaps in AsGa.
  • the insulation capacities 16 (16A) as well as the resistors 15 (15) have the role of bringing to the level of the junction of the two varicaps 22 and 23 (22A and 23A) an infinite impedance for the microwave frequencies considered: these are "surface mount components” (CMS); which allows automatic serial production of the filter of the invention and therefore a reduction in the cost price.
  • CMS surface mount components
  • the varicaps are housed in circular holes drilled in the substrate to allow better reproducibility of the assembly, so the lengths of the connection tails are not very variable from one assembly to another.
  • the filter of the invention is therefore a two-pole filter in which each resonator is composed of a line, two varicaps, and chokes due to the connection tails of the varicaps.
  • the coupling between the two resonators takes place at the level of the lines: the coupling between the two lines 11 and 11A depends on their thickness, their spacing and their length.
  • the coupling between resonators depends on the operating frequency. Due to the impedance inversions, the necessary filtering function would not be broadband, which would introduce the deterioration of the adaptation in the tuning band according to the voltage applied to the varicaps.
  • the purpose of the adapters 18, 19 and 18A, 19A is to overcome this drawback: the elements of these symmetrical adaptations in fact make it possible to obtain a broadband adaptation which is preserved practically throughout the frequency band considered.
  • Varicaps can be used whose capacity can, for example, vary from 18 pF to 2pF for a voltage V varying from 0 to 24 Volts (at 500 KHz).
  • the capacity ratio which is then 9, limits the band in which the filter is adjustable. It is possible, by increasing this ratio, to obtain filters adjustable over a wider band.

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Control Of Motors That Do Not Use Commutators (AREA)
EP88101782A 1987-02-11 1988-02-08 Abstimmbares Mikrowellenfilter Expired - Lifetime EP0281773B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8701718 1987-02-11
FR8701718A FR2610765B1 (fr) 1987-02-11 1987-02-11 Filtre hyperfrequence accordable

Publications (2)

Publication Number Publication Date
EP0281773A1 true EP0281773A1 (de) 1988-09-14
EP0281773B1 EP0281773B1 (de) 1992-09-30

Family

ID=9347810

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88101782A Expired - Lifetime EP0281773B1 (de) 1987-02-11 1988-02-08 Abstimmbares Mikrowellenfilter

Country Status (5)

Country Link
US (1) US4806890A (de)
EP (1) EP0281773B1 (de)
JP (1) JPH01132201A (de)
DE (1) DE3874916T2 (de)
FR (1) FR2610765B1 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104810596A (zh) * 2015-04-29 2015-07-29 清华大学 多模谐振器及其双频带滤波器
CN106848600A (zh) * 2016-12-30 2017-06-13 广东通宇通讯股份有限公司 超宽带水平极化水平全向天线

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA1278106C (en) * 1988-11-02 1990-12-18 Gordon Glen Rabjohn Tunable microwave wafer probe
JPH02152302A (ja) * 1988-12-02 1990-06-12 Fujitsu Ltd ２倍波阻止回路
FR2652211A1 (fr) * 1989-09-15 1991-03-22 Alcatel Transmission Resonateur hyperfrequence actif et filtre actif utilisant ce resonateur.
FR2679702A1 (fr) * 1991-07-23 1993-01-29 Thomson Csf Element semi-conducteur a capacite variable pour circuit integre en micro-ondes et circuit integre equipe d'au moins un tel element.
ES2403019B1 (es) * 2011-10-07 2014-03-11 Universidad Politécnica De Valencia Filtro de microondas sintonizable en tecnología de montaje superficial basado en cavidades resonantes coaxiales integradas en substrato
CN110247143B (zh) * 2019-06-19 2023-12-19 南京信息工程大学 一种具有可切换和可调谐的微带带通滤波器
CN114552152B (zh) * 2022-04-06 2022-12-27 成都美数科技有限公司 一种多模超宽带滤波器及其设计方法
PL248903B1 (pl) * 2023-09-04 2026-02-09 Politechnika Slaska Im Wincent Układ dwuobwodowego, przestrajanego, planarnego mikrofalowego filtru pasmowoprzepustowego
PL446023A1 (pl) * 2023-09-04 2025-03-10 Politechnika Śląska Układ dwuobwodowego, przestrajanego, planarnego mikrofalowego filtru pasmowoprzepustowego o regulowanej szerokości pasma
PL446024A1 (pl) * 2023-09-04 2025-03-10 Politechnika Śląska Układ dwuobwodowego, przestrajanego, planarnego, mikrofalowego filtru pasmowoprzepustowego sprzężonego pojemnościowo

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2915716A (en) * 1956-10-10 1959-12-01 Gen Dynamics Corp Microstrip filters
FR1523984A (fr) * 1967-05-25 1968-05-03 Fernsehgeratewerke Stassfurt V Dispositif de couplage conducteur pouvant être accordé pour oscillations électriques de haute fréquence
US3530411A (en) * 1969-02-10 1970-09-22 Bunker Ramo High frequency electronic circuit structure employing planar transmission lines
US4023125A (en) * 1975-10-17 1977-05-10 General Electric Company Printed broadband rf bias circuits
US4078217A (en) * 1976-04-05 1978-03-07 The United States Of America As Represented By The Secretary Of The Navy Microwave isolation switch
US4211987A (en) * 1977-11-30 1980-07-08 Harris Corporation Cavity excitation utilizing microstrip, strip, or slot line
EP0138438A2 (de) * 1983-10-13 1985-04-24 Salora Oy Bis zur Hyperfrequenz abstimmbare Filterschaltung und deren Ausführung

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1457806A (en) * 1974-03-04 1976-12-08 Mullard Ltd Semiconductor device manufacture
US4500854A (en) * 1981-04-20 1985-02-19 John Fluke Mfg. Co., Inc. Voltage-controlled RF oscillator employing wideband tunable LC resonator
US4468644A (en) * 1982-09-23 1984-08-28 General Instrument Corp. Tunable reject filter for radar warning receiver
US4619001A (en) * 1983-08-02 1986-10-21 Matsushita Electric Industrial Co., Ltd. Tuning systems on dielectric substrates

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2915716A (en) * 1956-10-10 1959-12-01 Gen Dynamics Corp Microstrip filters
FR1523984A (fr) * 1967-05-25 1968-05-03 Fernsehgeratewerke Stassfurt V Dispositif de couplage conducteur pouvant être accordé pour oscillations électriques de haute fréquence
US3530411A (en) * 1969-02-10 1970-09-22 Bunker Ramo High frequency electronic circuit structure employing planar transmission lines
US4023125A (en) * 1975-10-17 1977-05-10 General Electric Company Printed broadband rf bias circuits
US4078217A (en) * 1976-04-05 1978-03-07 The United States Of America As Represented By The Secretary Of The Navy Microwave isolation switch
US4211987A (en) * 1977-11-30 1980-07-08 Harris Corporation Cavity excitation utilizing microstrip, strip, or slot line
EP0138438A2 (de) * 1983-10-13 1985-04-24 Salora Oy Bis zur Hyperfrequenz abstimmbare Filterschaltung und deren Ausführung

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES, vol. MTT-33, no. 12, décembre 1985, pages 1416-1421, IEEE, New York, US; C. NGUYEN et al.: "On the analysis and design of spurline bandstop filters" *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104810596A (zh) * 2015-04-29 2015-07-29 清华大学 多模谐振器及其双频带滤波器
CN106848600A (zh) * 2016-12-30 2017-06-13 广东通宇通讯股份有限公司 超宽带水平极化水平全向天线
CN106848600B (zh) * 2016-12-30 2019-10-11 广东通宇通讯股份有限公司 超宽带水平极化水平全向天线

Also Published As

Publication number Publication date
FR2610765A1 (fr) 1988-08-12
JPH01132201A (ja) 1989-05-24
DE3874916D1 (de) 1992-11-05
FR2610765B1 (fr) 1989-02-17
EP0281773B1 (de) 1992-09-30
US4806890A (en) 1989-02-21
DE3874916T2 (de) 1993-02-18

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