EP0281773B1 - Abstimmbares Mikrowellenfilter - Google Patents

Abstimmbares Mikrowellenfilter Download PDF

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Publication number
EP0281773B1
EP0281773B1 EP88101782A EP88101782A EP0281773B1 EP 0281773 B1 EP0281773 B1 EP 0281773B1 EP 88101782 A EP88101782 A EP 88101782A EP 88101782 A EP88101782 A EP 88101782A EP 0281773 B1 EP0281773 B1 EP 0281773B1
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EP
European Patent Office
Prior art keywords
filter
ground
variable capacitance
diodes
filter according
Prior art date
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Expired - Lifetime
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EP88101782A
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English (en)
French (fr)
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EP0281773A1 (de
Inventor
Mustafa Gurcan
Maurice Bernard
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Alcatel CIT SA
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Alcatel Telspace SA
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    • 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 frequencies, or OL, of the last transposition, of the image frequencies and of the mixing products are clearly 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 each connected at the two ends to ground and each comprising, connected in series: the second end, grounded, a first and a second diode with variable capacity, a connection line, and the first end, grounded, the diodes being controlled by a DC signal, said filter being arranged on the first face of a planar substrate, characterized in that the line of connection is a microstrip line, and in that the microwave input and output are connected to the common points between the microstrip line and the second variable capacity diode of the first and second branch 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 price of 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 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 first microstrip line in length (2k + 1) ⁇ / 4 and by the resistance of the RC filter, and at the ground end of the first variable capacitance diode by the capacity of the RC filter; a second microstrip line, connecting the two branches to the DC voltage source, such that the total length of the first and second line is (2k '+ 1) ⁇ / 4 ; k and k 'being any integers.
  • 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.
  • 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 such that the length 21 + 14A is equal to (2k '+ 1) ⁇ / 4 .
  • 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 220 (220A) 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 12, 13, 12A and 13A. These varicaps are for example therefore cheaper than varicaps in AsGa.
  • the insulation capacities 16 (16A) as well as the resistors 15 (15A) have the role of bringing to the level of the junction of the two varicaps 12 and 13 (12A and 13A) 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.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Control Of Motors That Do Not Use Commutators (AREA)

Claims (6)

  1. Abstimmbares Mikrowellenfilter mit zwei Zweigen gleichen Typs, von denen jeder mit beiden Enden (22, 24) an Masse angeschlossen ist und jeweils in Reihenschaltung aufweist: das zweite Ende (24) an Masse gelegt, eine erste (13, 13A) und eine zweite Diode (12, 12A) mit veränderlicher Kapazität, eine Verbindungsleitung (11, 11A), und das erste Ende (22) an Masse gelegt, wobei die Dioden von einem Gleichstromsignal (V) angesteuert werden und das Filter auf der ersten Seite (9) eines ebenen Substrats (8) angeordnet ist, dadurch gekennzeichnet, daß die Verbindungsleitung (11, 11A) eine Mikrobandleitung ist und daß der Mikrowelleneingang (E) bzw. der Mikrowellenausgang (S) mit dem gemeinsamen Punkt zwischen der Mikrobandleitung (11, 11A) und der zweiten Diode mit veränderlicher Kapazität (12, 12A) des ersten bzw. des zweiten Zweigs über einen symmetrischen Adapter (18, 19 und 18A, 19A) verbunden ist.
  2. Filter nach Anspruch 1, dadurch gekennzeichnet, daß die zweite Seite des Substrats vollständig metallisiert ist und eine Erdungsfläche bildet, wobei die Erdungspunkte (22, 24) aus metallisierten Löchern bestehen.
  3. Filter nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die Gleichspannungsversorgung (V) jedes Zweigs über ein RC-Filter (15, 16 und 15A, 16A) erfolgt.
  4. Filter nach Anspruch 3, dadurch gekennzeichnet, daß die Gleichspannungsversorgung (V) an den gemeinsamen Punkt der beiden Dioden veränderlicher Kapazität (12, 13 und 12A, 13A) über eine erste Mikrobandleitung (12A, 14) mit der Länge (2k+1)λ/4
    Figure imgb0010
     und über den Widerstand (15, 15A) des RC-Filters angeschlossen ist, wobei λ die Wellenlänge des betrachteten Mikrowellensignals ist, und daß sie über die Kapazität (16, 16A) des RC-Filters mit dem an Masse (24) liegenden Ende der ersten Diode veränderlicher Kapazität verbunden ist, wobei eine zweite Mikrobandleitung (21), die den zweiten Zweig mit der Gleichspannungsquelle (V) verbindet, so ausgebildet ist, daß die Gesamtlänge der ersten und zweiten Leitung (14 oder 14A) und 21) den Wert (2k'+1)λ/4
    Figure imgb0011
     besitzt, wobei k und k' beliebige ganze Zahlen sind.
  5. Filter nach Anspruch 1, dadurch gekennzeichnet, daß jeder Adapter aus einem zentralen Arm (19, 19A) und zwei Seitenarmen (18, 18A) besteht, die relativ zum zentralen Arm zwei parallele Arme bilden.
  6. Filter nach einem beliebigen der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß die Dioden mit veränderlicher Kapazität (12, 12A und 13, 13A) in den in das Substrat gebohrten Löchern (22, 22A und 13, 13A) angeordnet sind und so sehr genau positioniert werden könne.
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 EP0281773A1 (de) 1988-09-14
EP0281773B1 true EP0281773B1 (de) 1992-09-30

Family

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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)

Families Citing this family (9)

* 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
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
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
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

Family Cites Families (11)

* 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
GB1457806A (en) * 1974-03-04 1976-12-08 Mullard Ltd Semiconductor device manufacture
US4023125A (en) * 1975-10-17 1977-05-10 General Electric Company Printed broadband rf bias circuits
US4031488A (en) * 1976-04-05 1977-06-21 The United States Of America As Represented By The Secretary Of The Navy Multiple polarization switch
US4211987A (en) * 1977-11-30 1980-07-08 Harris Corporation Cavity excitation utilizing microstrip, strip, or slot line
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
FI67980C (fi) * 1983-10-13 1985-06-10 Salora Oy Koppling foer ett foer mikrovaogsfrekvenser avstaembart filtersamt foerverkligande av densamma

Also Published As

Publication number Publication date
US4806890A (en) 1989-02-21
DE3874916T2 (de) 1993-02-18
DE3874916D1 (de) 1992-11-05
FR2610765A1 (fr) 1988-08-12
JPH01132201A (ja) 1989-05-24
EP0281773A1 (de) 1988-09-14
FR2610765B1 (fr) 1989-02-17

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