EP0015610B1 - Spiegelfrequenzreflektierendes Mikrowellenfilter und Mikrowellenempfänger mit einem solchen Filter - Google Patents

Spiegelfrequenzreflektierendes Mikrowellenfilter und Mikrowellenempfänger mit einem solchen Filter Download PDF

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Publication number
EP0015610B1
EP0015610B1 EP80200158A EP80200158A EP0015610B1 EP 0015610 B1 EP0015610 B1 EP 0015610B1 EP 80200158 A EP80200158 A EP 80200158A EP 80200158 A EP80200158 A EP 80200158A EP 0015610 B1 EP0015610 B1 EP 0015610B1
Authority
EP
European Patent Office
Prior art keywords
frequency
filter
signal
transmission line
quarter
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
EP80200158A
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English (en)
French (fr)
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EP0015610A1 (de
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
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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 EP0015610A1 publication Critical patent/EP0015610A1/de
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Publication of EP0015610B1 publication Critical patent/EP0015610B1/de
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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
    • H01P1/2039—Galvanic coupling between Input/Output
    • 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

Definitions

  • the present invention relates, in a microwave receiver comprising a mixer to which on the one hand the reception signal of frequency f s and on the other hand a frequency signal f OL supplied by a local oscillator and which delivers after mixing a signal to intermediate frequency, an image frequency reflection filter produced in planar structure according to the microstrip technique and intended to prevent, by its installation upstream of the mixer, the return to the input of the parasitic signal receiver of frequency f IM called frame rate and equal to (2f oL - f s ) sent by the mixer.
  • a mixer is a device with a non-linear characteristic and that the combination of the signals of frequency f s and f OL can give rise, in fact, to the appearance of a whole series of other second-order products which are also spurious signals, but their frequency is more distant than f IM from the useful frequency band including f s and f OL and their filtering therefore does not have to be considered here.
  • the object of the invention is to provide an original filter structure which, while remaining compact and therefore usable in many applications where a small footprint is an essential quality, exhibits significantly improved performance compared to existing filters.
  • the invention relates to an image frequency reflection filter as defined above and characterized in that it consists of the combination of a single microwave element, placed in parallel on the main transmission line of the signal. reception of frequency f s , on the one hand from a quarter-wave filter of width at least equal to that of this transmission line and of length equal to a quarter of the wavelength associated with the image frequency f IM and on the other hand, an odd-mode resonator, constituted by the presence in the unconnected end of the quarter-wave filter of a recess transverse to the transmission line and dividing this quarter-wave filter into two separate arms .
  • the structure thus defined is particularly advantageous in that it offers a single microwave element - and therefore all the more compact - for the realization of two distinct microwave functions which combine their effects, namely a quarter-wave type filtering and an odd-mode resonance.
  • the presence of the quarter-wave filter acts as a notch filter in a frequency band centered on the parasitic frequency f IM to be eliminated (the width of this band being linked to that of this filter).
  • the odd-mode resonator without reducing the action of the quarter-wave filter, contributes by its action to reducing the width of the so-called transition frequency band between the reflection band and the transmission band, that is to say to make the filter slope steeper by bringing the lower and upper limits of this transition band closer to each other, which amounts to raising the upper limit of the reflection band while simultaneously improving the adaptation of the filter for the reception frequency f s and for the local frequency f oL .
  • This last characteristic makes it possible in particular to reduce the power of the local oscillator.
  • the reference plane of the reflection filter is perfectly defined and localized, since the connection of this filter to the main transmission line is carried out at a single point and its action only occurs at this point.
  • the image frequency reflection filter described with reference to FIG. 1 is produced in a so-called planar structure, according to the microstrip technique associated with a dielectric support, and consists of a single microwave element placed in parallel on a main transmission line 1 of the microwave signal of frequency f s .
  • This microwave element is composed of two parts: on the one hand a quarter wave filter 20 of width substantially equal to that of the line at its connection point in parallel thereon and of length equal to a quarter of the wavelength associated with the parasitic frequency f, M to be eliminated, on the other hand of an odd-mode resonator constituted by the presence in the unconnected end of this filter 20 of a recess 24 transverse to the line and located between two arms 22 now separate and here symmetrical.
  • the quarter-wave filter 20 which is for example a circular conducting surface connecting to the transmission line 1 over a width here equal to that of this line, allows the attenuation of a frequency band centered on the parasitic frequency f, M (see an example of a filtering curve in FIG. 2), while the odd-mode resonator (22, 24) makes it possible to narrow the transition frequency band between the reflection R and transmission bands T, by raising its lower limit thanks to the resonance of the odd mode on a frequency which depends on the length of the resonator, from one arm 22 to the other, and therefore of the depth of the recess 24 (which increases the reflection strip).
  • the odd mode resonant frequency f R can also be modified by placing in the transverse recess 24 a conductive surface 27 isolated from the rest of the element and intended to allow adjustment of the resonant frequency and of the overvoltage of the resonator, in order to make the slope of the filter curve between f, M and f OL steeper and therefore to decrease the width of the frequency band corresponding to this area of the curve, and in order to ensure greater insensitivity to foreign metallic bodies by better concentration of the magnetic field.
  • the image frequency reflection filter according to the invention is extremely compact, while presenting the original characteristic of playing alone a double function absent from conventional passive microwave elements and by meeting the requirements mentioned above. (reflection strip, reference plane, losses).
  • the image frequency reflection filter according to the invention which is therefore a notch filter (see the filtering curve of FIG. 2) can be used in particular in a microwave receiver for television signals.
  • signals at the frequency f s received by an antenna are sent to a mixer 30 which also receives, via a directional filter 31, a signal at the frequency f OL delivered by a local oscillator 32, and which delivers a signal at the intermediate frequency f Fl .
  • the filter 33 according to the invention is placed on the connection which precedes the input of the mixer 30 to recover the energy of the signal of frequency f, M and avoid the emission by the antenna of a signal at this frequency, and the fact that its reference plane is well defined and localized makes it possible to perform this positioning at a distance from this mixer such that, for the image frequency f IM to be reflected, the impedance seen by the mixer is optimal.
  • the present invention is not limited to the exemplary embodiments which have just been described and shown, from which other modes and other embodiments can be provided, without thereby departing from the scope of the invention. 'invention.
  • the application of the invention has been described above in the case of the microstrip structure, but a filter according to the invention can also be used in the case of a suspended microstrip structure.
  • the filter according to the invention can be equipped with an adaptation circuit consisting of a rectangular conductive surface 18 (see FIG. 1 ) of length equal to three-eighths of the wavelength associated with the frequency f s and connected over its entire length to the transmission line 1.
  • This surface 18 combines two discontinuities whose compensatory effects of the residual mismatch of the reflection filter improve the quality of the transmission around the frequency f s . In fact, at this frequency, the capacitive nature of the surface 18 compensates for the inductive nature of the section x / 4.

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

Claims (5)

1. Reflexionsfilter der Bildfrequenz fIM mit planarer Struktur entsprechend der Mikrostreifentechnik in einem HF-Empfänger mit einer Mischstufe (30), de einerseits das Empfangssignal mit der Frequenz fs und andererseits ein Signal von einem Ortsoszillator (32) zugeführt wird und die nach Mischung ein ZF-Signal liefert, dadurch gekennzeichnet, dass das Filter gebildet ist durch die Vereinigung in einem einzigen Element, das parallel zu der Hauptübertragungsleitung (1) des Empfangssignals angeordnet ist, einerseits eines Viertelwellenlängenfilters (20) mit einer Breite wenigstens entsprechend der Übertragungsleitung und mit einer Länge entsprechend der der Bildfrequenz f,M zugeordneten Wellenlänge und andererseits eines Resonators (22, 24) des ungeraden Modus, der dadurch gebildet ist, daß in dem nicht angeschlossenen Ende des Viertelwellenlängenfilters (20) eine Außsparung (24) quer zu der Übertragungsleitung (1) vorhanden ist, wodurch dieses Viertelwellenlängenfilter in zwei einzelne Zweige (22) aufgeteilt wird.
2. Bildfrequenzreflexionsfilter nach Anspruch 1, dadurch gekennzeichnet, daß das Viertelwellenlängenfilter (20) eine kreisrunde Leiterfläche ist, die mit der Übertragungsleitung (1) verbunden ist und zwar über eine Breite, die wenigstens der Breite dieser Leitung entspricht.
3. Bildfrequenzreflexionsfilter nach einem der Ansprüche 1 und 2, dadurch gekennzeichnet, daß die Queraußparung (24) mit einer leitenden Fläche (27) bedeckt ist, die gegenüber dem restlichen Teil des HF-Elementes isoliert ist.
4. Bildfrequenzreflexionsfilter nach einem der Ansprüche 1-3, dadurch gekennzeichnet, daß das Filter einen Anpaßungskreis enthält mit einer rechtwinkligen Leiterfläche (18), deren Länge drei Achtel der Länge der zugeordneten Welle mit der Frequenz fs entspricht und die über die ganze Länge mit der Übertragungsleitung (1) verbunden ist.
5. Gebrauch eines Bildfrequenzreflexionsfilters nach einem der Ansprüche 1-4 in einem HF-Empfänger mit insbesondere einer Mischstufe (30), der ein Empfangssignal mit der Frequenz fS und ein ein Signal mit der Frequenz fOL von einem Ortsoszillator (32) zugeführt wird und die nach Mischung ein Signal liefert, das geeignet ist als Zwischenfrequenz fF1 entsprechend dem Unterschied zwischen den Frequenzen fS und fOL.
EP80200158A 1979-03-06 1980-02-26 Spiegelfrequenzreflektierendes Mikrowellenfilter und Mikrowellenempfänger mit einem solchen Filter Expired EP0015610B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR7905735A FR2451110A1 (fr) 1979-03-06 1979-03-06 Filtre de reflexion de frequence image en hyperfrequence
FR7905735 1979-03-06

Publications (2)

Publication Number Publication Date
EP0015610A1 EP0015610A1 (de) 1980-09-17
EP0015610B1 true EP0015610B1 (de) 1984-09-26

Family

ID=9222808

Family Applications (1)

Application Number Title Priority Date Filing Date
EP80200158A Expired EP0015610B1 (de) 1979-03-06 1980-02-26 Spiegelfrequenzreflektierendes Mikrowellenfilter und Mikrowellenempfänger mit einem solchen Filter

Country Status (5)

Country Link
US (1) US4313097A (de)
EP (1) EP0015610B1 (de)
JP (1) JPS55121702A (de)
DE (1) DE3069254D1 (de)
FR (1) FR2451110A1 (de)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2460049A1 (fr) * 1979-06-25 1981-01-16 Labo Electronique Physique Filtre coupe-bande pour ligne de transmission hyperfrequence et circuit de polarisation de transistor hyperfrequence comprenant ce filtre
US4371853A (en) * 1979-10-30 1983-02-01 Matsushita Electric Industrial Company, Limited Strip-line resonator and a band pass filter having the same
JPS59125102A (ja) * 1982-12-29 1984-07-19 Matsushita Electric Ind Co Ltd 高周波用電波フイルタ装置
DE3304862A1 (de) * 1983-02-12 1984-08-16 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Hf-filter
US4873501A (en) * 1986-06-27 1989-10-10 The United States Of America As Represented By The Secretary Of The Navy Internal transmission line filter element
JPH0385903A (ja) * 1989-08-30 1991-04-11 Kyocera Corp 帯域通過フィルタ
US5734307A (en) * 1996-04-04 1998-03-31 Ericsson Inc. Distributed device for differential circuit
US6792299B2 (en) 2001-03-21 2004-09-14 Conductus, Inc. Device approximating a shunt capacitor for strip-line-type circuits
US7558608B2 (en) * 2004-09-29 2009-07-07 Fujitsu Limited Superconducting device, fabrication method thereof, and filter adjusting method
US8710942B2 (en) * 2008-05-28 2014-04-29 Kyocera Corporation Bandpass filter and radio communication module and radio communication device using the same

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3688225A (en) * 1969-05-21 1972-08-29 Us Army Slot-line
US3678433A (en) * 1970-07-24 1972-07-18 Collins Radio Co Rf rejection filter
DE2118309A1 (de) * 1971-04-15 1972-10-19 Siemens Ag Verfahren zum Erniedrigen der Resonanzfrequenz von Microstrip-Resonatoren
FR2261655A2 (en) * 1973-02-20 1975-09-12 Minet Roger Microwave line band filter - with central conductor inserted between two dielectric sheets

Also Published As

Publication number Publication date
FR2451110A1 (fr) 1980-10-03
JPS6340361B2 (de) 1988-08-10
EP0015610A1 (de) 1980-09-17
DE3069254D1 (en) 1984-10-31
US4313097A (en) 1982-01-26
JPS55121702A (en) 1980-09-19
FR2451110B1 (de) 1984-05-11

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