EP0021523B1 - Filtre coupe-bande pour ligne de transmission hyperfréquence et circuit de polarisation de transistor hyperfréquence comprenant ce filtre - Google Patents

Filtre coupe-bande pour ligne de transmission hyperfréquence et circuit de polarisation de transistor hyperfréquence comprenant ce filtre Download PDF

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Publication number
EP0021523B1
EP0021523B1 EP19800200567 EP80200567A EP0021523B1 EP 0021523 B1 EP0021523 B1 EP 0021523B1 EP 19800200567 EP19800200567 EP 19800200567 EP 80200567 A EP80200567 A EP 80200567A EP 0021523 B1 EP0021523 B1 EP 0021523B1
Authority
EP
European Patent Office
Prior art keywords
filter
frequency
filtering element
transmission
transmission line
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
Application number
EP19800200567
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0021523A1 (fr
Inventor
François de Ronde
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.)
Laboratoires dElectronique Philips SAS
Koninklijke Philips NV
Original Assignee
Laboratoires dElectronique et de Physique Appliquee
Philips Gloeilampenfabrieken NV
Koninklijke Philips Electronics NV
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 Laboratoires dElectronique et de Physique Appliquee, Philips Gloeilampenfabrieken NV, Koninklijke Philips Electronics NV filed Critical Laboratoires dElectronique et de Physique Appliquee
Publication of EP0021523A1 publication Critical patent/EP0021523A1/fr
Application granted granted Critical
Publication of EP0021523B1 publication Critical patent/EP0021523B1/fr
Expired 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
    • H01P1/2039—Galvanic coupling between Input/Output

Definitions

  • the present invention relates to a notch filter for microwave transmission line with distributed constants produced in planar structure and in particular according to the microstrip technique, as well as a microwave transistor bias circuit comprising this filter.
  • a conventional way of ensuring the reception of a microwave signal consists in providing in the receiver a mixer which receives on the one hand this useful microwave signal of frequency f s and on the other hand a signal of frequency f OL delivered by an oscillator local and which delivers a signal at an intermediate frequency f FI equal to the difference of the frequencies f s and f OL .
  • a filter must be placed which prevents the transmission of the frequencies f s and f OL while favoring that of the lower frequency f F , i.e. a low-pass filter or all at least tape cutter.
  • the object of the invention is to propose a band-cut microwave filter which avoids such necessarily unsatisfactory compromises and which proves to be extremely compact while presenting a fairly wide cut band and offering a short-circuit plane well located by compared to the mixer to optimize the yield thereof.
  • the invention relates to a notch filter for microwave transmission line with distributed constants produced in planar structure and in particular according to the microstrip technique, with the characteristics according to claim 1.
  • the notch filter thus produced can use an extremely small space very efficiently, and a judicious choice of the dimensions and the relative position of the two filter elements makes it possible to obtain at will the desired width of cut band.
  • the filter may include at least a third filtering element intended to prevent the transmission of a third frequency band centered on the frequency twice the central frequency of the first frequency band and composed of a quarter wave filter of electrical length ⁇ 1/8 placed in parallel on one of the two transmission channels at a distance from the entry point of the notch filter equal to ⁇ 1/2 .
  • the notch filter shown in Figure 1 has an entry point E, to which an upstream part Le of the transmission line is connected, to which the filter is incorporated, and an exit point S, to which a downstream part is connected L s of this transmission line.
  • This notch filter is composed of a first filter element 10 and a second filter element 20, intended to prevent the transmission of a first frequency band and a second frequency band adjacent to the first, respectively. .
  • Element 20 is composed of a quarter-wave filter, of electrical length equal to a quarter of the wavelength X 2 associated with the center frequency of the second frequency band, and placed at the entry point E of the notch filter.
  • the element 10 is composed of a set of two transmission paths 21 and 22 in parallel which separate at the entry point E, in the short-circuit plane defined by the presence of the second filter element 20, surround this element 20 then regroup at the exit point S.
  • La first channel 21 follows in the example here describes a circular arc path of electrical length ⁇ 1/4 (At 1 being the wavelength associated with the center frequency of the first frequency band), while the second channel 22 follows a path in a complementary arc, of electrical length 3 ⁇ 1/4 .
  • the signals at the frequency corresponding to the wavelength ⁇ 1 therefore arrive in phase opposition and no signal at this frequency is transmitted to the part L s of the line of transmission.
  • the contour of the notch filter is obviously extremely compact, since the circular shape adopted for element 10 is very compact and the interior of this first element is used for positioning. of the second filter element. Furthermore, the insulation provided by the notch filter according to the invention is excellent, and limited only by the parasitic coupling (higher modes) which can appear between E and S (an attenuation of 60 dB can for example be obtained if you don't want a bandwidth greater than a few percent).
  • This exemplary embodiment of the invention is an advantageous compact structure in two respects, on the one hand for its use in applications where the small dimensions of the components play a primordial role, and on the other hand in that it allows better focus the electric and magnetic fields and thus make the filter less sensitive to proximity effects.
  • the wavelength X2 is for example that which is associated with the useful microwave signal of frequency f s received and intended for the mixer (for example a microwave diode), and the length of wave ⁇ 1 that associated with the frequency signal f OL supplied by the local oscillator and also sent to the mixer.
  • the downstream part Lg of the transmission line receives only the frequency signal f FI supplied by the non-linear component that constitutes the mixer; the frequency signals f s and f OL do not reach this part L S , thanks to the combined action of the filter elements 10 and 20.
  • this filter comprises, in accordance with FIG. 2, a third filtering element 30, intended to prevent the transmission of a third frequency band centered on the frequency twice the center frequency of the first frequency band.
  • the signal of frequency f OL delivered by the local oscillator has an amplitude in general much higher than that of the received microwave signal, of frequency fs, and the presence of the harmonic of rank 2 of this frequency signal f OL therefore corresponds to a significant loss of energy.
  • the introduction of the third filter element 30 makes it possible to prevent the transmission of this harmonic and to avoid the deterioration of the yield which results from such a transmission.
  • This third filtering element 30 is a quarter-wave filter placed in parallel on the second transmission channel 22, at a distance from the entry point E of the notch filter equal to ⁇ 1/2 and its length is ⁇ 1 / 8 since we want to eliminate the harmonic of rank 2 from the signal filtered by the first filtering element 10.
  • FIG. 3 shows another possible application of the invention, namely the incorporation of the notch filter into the bias circuit of a microwave transistor.
  • the notch filter according to the invention is connected (perpendicularly in the present case), at its entry point E, to a section 40 of transmission line, itself placed in parallel on a transmission line 41 comprising a microwave transistor 42 and a capacitor 45.
  • the length of the section 40 is equal to a quarter of the wavelength associated with the microwave signal crossing the transmission line 41.
  • the filter is also connected perpendicularly, at its output point S, to a power supply circuit 43 of the transistor 42.
  • This arrangement allows the circuit 43 to ensure the bias of the transistor 42 by transmission of its bias voltage across the line section 44, the notch filter (such as that of the FIG. 1 for example), the section 40 and the line 41. Conversely, the microwave signal which traverses the line 41 cannot reach the circuit 43 because of the effective barrier constituted by the notch filter. The filtering action is even more effective if the section 40 is given as high an impedance as possible.
  • the circular arrangement of the two transmission paths of the first filter element has been recognized as being as compact as possible, but a square or rectangle arrangement, for example, remains compact and therefore almost as advantageous as that described and shown.

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Control Of Motors That Do Not Use Commutators (AREA)
  • Waveguide Connection Structure (AREA)
EP19800200567 1979-06-25 1980-06-17 Filtre coupe-bande pour ligne de transmission hyperfréquence et circuit de polarisation de transistor hyperfréquence comprenant ce filtre Expired EP0021523B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR7916260A FR2460049A1 (fr) 1979-06-25 1979-06-25 Filtre coupe-bande pour ligne de transmission hyperfrequence et circuit de polarisation de transistor hyperfrequence comprenant ce filtre
FR7916260 1979-06-25

Publications (2)

Publication Number Publication Date
EP0021523A1 EP0021523A1 (fr) 1981-01-07
EP0021523B1 true EP0021523B1 (fr) 1986-05-07

Family

ID=9227049

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19800200567 Expired EP0021523B1 (fr) 1979-06-25 1980-06-17 Filtre coupe-bande pour ligne de transmission hyperfréquence et circuit de polarisation de transistor hyperfréquence comprenant ce filtre

Country Status (7)

Country Link
EP (1) EP0021523B1 (enrdf_load_stackoverflow)
JP (1) JPS566501A (enrdf_load_stackoverflow)
AU (1) AU536334B2 (enrdf_load_stackoverflow)
BR (1) BR8003890A (enrdf_load_stackoverflow)
CA (1) CA1159118A (enrdf_load_stackoverflow)
DE (1) DE3071590D1 (enrdf_load_stackoverflow)
FR (1) FR2460049A1 (enrdf_load_stackoverflow)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2510326A1 (fr) * 1981-07-24 1983-01-28 Thomson Csf Filtre passe-bande a resonateurs lineaires ouverts a leurs deux extremites
FR2517491A1 (fr) * 1981-11-27 1983-06-03 Labo Electronique Physique Combineur-melangeur a transistor double source
DE69332249T2 (de) * 1992-04-30 2003-04-10 Matsushita Electric Industrial Co., Ltd. Schleifenförmiger Zweifachmodus-Streifenresonator zum Mitschwingenlassen von Mikrowellen in zwei Moden und Bandpassfilter mit den Resonatoren
JP5749133B2 (ja) * 2011-10-04 2015-07-15 古河電気工業株式会社 高周波モジュール
JP7133486B2 (ja) * 2019-01-16 2022-09-08 日立Astemo株式会社 信号伝送装置、信号伝送システム

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR72524E (fr) * 1951-05-23 1960-04-14 Int Standard Electric Corp Système de transmission pour haute fréquence
BE518176A (enrdf_load_stackoverflow) * 1952-05-08
US3150325A (en) * 1962-04-12 1964-09-22 Donald J Blattner Wide band traveling wave parametric amplifier
DE2453605B2 (de) * 1974-11-12 1976-09-09 Siemens AG, 1000 Berlin und 8000 München Wellenleiter-koppler zur gleichmaessigen aufteilung oder zusammenschaltung von signalenergie
JPS5352336A (en) * 1976-10-22 1978-05-12 Mitsubishi Electric Corp Dividing filter
DE2804118C2 (de) * 1978-01-31 1982-03-04 Siemens AG, 1000 Berlin und 8000 München Mikrowellen-Ringhybridschaltung in Streifenleitungstechnik
US4185252A (en) * 1978-05-10 1980-01-22 The United States Of America As Represented By The Secretary Of The Army Microstrip open ring resonator oscillators
FR2451110A1 (fr) * 1979-03-06 1980-10-03 Labo Electronique Physique Filtre de reflexion de frequence image en hyperfrequence

Also Published As

Publication number Publication date
AU536334B2 (en) 1984-05-03
BR8003890A (pt) 1981-01-13
EP0021523A1 (fr) 1981-01-07
AU5951480A (en) 1981-01-08
JPS6322481B2 (enrdf_load_stackoverflow) 1988-05-12
FR2460049B1 (enrdf_load_stackoverflow) 1983-07-08
CA1159118A (en) 1983-12-20
JPS566501A (en) 1981-01-23
FR2460049A1 (fr) 1981-01-16
DE3071590D1 (en) 1986-06-12

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