EP0959519A1 - Justierfreier Duplexer mit niedrigem Verlust - Google Patents

Justierfreier Duplexer mit niedrigem Verlust Download PDF

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Publication number
EP0959519A1
EP0959519A1 EP99303288A EP99303288A EP0959519A1 EP 0959519 A1 EP0959519 A1 EP 0959519A1 EP 99303288 A EP99303288 A EP 99303288A EP 99303288 A EP99303288 A EP 99303288A EP 0959519 A1 EP0959519 A1 EP 0959519A1
Authority
EP
European Patent Office
Prior art keywords
duplexer
tunnels
microwave signals
lid
signals according
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Withdrawn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
EP99303288A
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English (en)
French (fr)
Inventor
Alain Nguyen
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.)
TRT Lucent Technologies SA
Original Assignee
TRT Lucent Technologies 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
Priority claimed from EP98460013A external-priority patent/EP0959517A1/de
Application filed by TRT Lucent Technologies SA filed Critical TRT Lucent Technologies SA
Priority to EP99303288A priority Critical patent/EP0959519A1/de
Publication of EP0959519A1 publication Critical patent/EP0959519A1/de
Withdrawn legal-status Critical Current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
    • H01P1/00—Auxiliary devices
    • H01P1/20—Frequency-selective devices, e.g. filters
    • H01P1/213—Frequency-selective devices, e.g. filters combining or separating two or more different frequencies
    • H01P1/2138—Frequency-selective devices, e.g. filters combining or separating two or more different frequencies using hollow waveguide filters

Definitions

  • the present invention relates to a duplexer for microwave signals.
  • Duplexers are usually devices found at the end of a system in items of radio equipment, i.e. at the antenna. They are designed to separate the signals transmitted from the signals received by the antenna.
  • a duplexer conventionally comprises two passband filters, one responsible for filtering the transmitted signals and the other the received signals.
  • a passband filter for microwave signals consists of a tunnel comprising a succession of compartments communicating with one another through a longitudinal passage, the dimensions and number of compartments being a function of the size and the center frequency of the passband of the filter.
  • a duplexer for microwave signals therefore generally comprises two tunnels of this type that are respectively connected by one end to the transmission part and to the reception part of the radio equipment and that open jointly into the other end on the antenna side.
  • passband filters are designed to meet the following conditions:
  • the equipment is generally provided with a low pass filter interposed between the duplexer and the antenna.
  • duplexers are generally made of a material that is highly stable under temperature, for example invar which is an alloy of iron and nickel with a coefficient of thermal expansion that is practically zero.
  • invar which is an alloy of iron and nickel with a coefficient of thermal expansion that is practically zero.
  • this type of material proves to be very costly and very difficult to machine.
  • the method generally used to manufacture duplexers is to make tunnels out of invar plates and solder transversal partition walls thereto so as to obtain compartments in these tunnels.
  • duplexers are then methodically provided with a system of setting by screws to obtain the desired signal filtering and transmission characteristics. Tapped holes are made in the upper wall of the tunnels to receive setting screws.
  • one setting screw is provided per compartment with another screw being provided in the partitition walls of each compartment in the longitudinal passage.
  • the setting operation then consists in adjusting the part of the screw that projects into the compartment or into the longitudinal passage. This operation proves to be very complicated and very lengthy.
  • the present invention seeks to overcome the prior art drawbacks by proposing a duplexer that does not require a system of setting by screws for the usual frequencies.
  • an object of the present invention is a duplexer for microwave signals comprising two passband filters designed to process respectively incoming signals and outgoing signals and to process these signals simultaneously, these filters consisting of two tunnels that open jointly at one end by a common part into a first hole and open independently at the other end into a second hole and a third hole, each of these tunnels comprising a longitudinal passage and compartments demarcated by transversal partition walls,
  • the block and the lid are preferably made of aluminum. Aluminum is indeed easier to machine than invar.
  • this material is less stable under temperature than invar, it is enough to provide for a slightly wider passband to compensate for the drifts in temperature of the material and increase the slope on the flanks of the passband of the filters to obtain the desired near band rejection.
  • the joining surface of the lid is covered with a uniform layer of a brazing alloy to obtain uniform adhesion on all the surfaces in contact with said monolithic block and with said lid after soldering.
  • the surfaces within said tunnels of said monolithic block are preferably subjected to a surface treatment to ensure efficient transmission of the signals in said tunnels.
  • Said surface treatment may consist for example in adding a surface layer of silver.
  • the common part through which said tunnels open into the first hole has a Y-shape and the external sides of its arms are concave.
  • Figures 1 and 2 provide a more particular illustration of a duplexer covering the 12.875 GHz - 13 GHz frequency band for transmission and the 13.125 GHz - 13.25 GHz frequency band for reception.
  • this type of duplexer may be used for other frequency bands in the microwave domain. It would then be enough to modify the characteristics of the compartments and of the longitudinal passage of the tunnels as well as the number of compartments.
  • each duplexer comprises firstly a monolithic block in which two tunnels are hollowed out and a common block joining these two tunnels and secondly a lid to close said block on the top.
  • FIG. 1 For reasons of clarity, the duplexer of Figure 1 is shown without its lid. Consequently, only one monolithic block 1 is shown in Figure 1.
  • This block is a parallelepiped comprising six plane rectangular faces.
  • the material used to manufacture the block is an aluminum-based alloy. This material is for example the alloy whose AFNOR designation is 2618 A. This alloy is especially easy to machine and has a relatively low thermal expansion coefficient.
  • Two parallel tunnels 2 and 3 are hollowed out into the plane upper surface of the monolithic block. These two tunnels open jointly at a first end into a hole 4 by means of a common Y-shaped part 5.
  • the hole 4 is located on the antenna side.
  • the tunnels 2 and 3 comprise a succession of compartments 6 demarcated by transversal partition walls 7 which are in sets of two that face each other on either side of a longitudinal passage.
  • This longitudinal passage is referenced 8 for the tunnel 2 and 9 for the tunnel 3.
  • the dimensional parameters within the tunnels 2 and 3 determine the functional characteristics of the two filters of the duplexer, namely the transmission losses and the return loss of the filters in the passband and their rejection in near band.
  • the thickness of the partition walls 7, the longitudinal and transversal dimensions of the compartments 6 and the width of the longitudinal passages 8 and 9 fix these characteristics with precision.
  • the prior art system of setting by means of screws is then superfluous, at least in the range of usual frequencies.
  • the longitudinal passages 8 and 9 and the common part 5 can be made by the milling technique which provides a totally satisfactory degree of precision (of about +/- 15 microns) for the applications in view. A mill with a radius of 2 millimeters is then enough to obtain the desired precision.
  • the longitudinal dimension of the compartments and the width of the longitudinal passages are defined with a precision of +/- 15 microns. The other dimensions are defined with a smaller precision of the order of +/- 20 microns.
  • the internal walls of the tunnels 2 and 3 are advantageously provided with surface treatment to ensure the efficient transmission of the signals.
  • This treatment consists for example of the addition of a surface layer of silver. This layer will also be used to protect the block from possible oxidation. It is preferably extended through the block.
  • the common part 5 has a Y-shape.
  • the external sides of the arms of the Y have concavities.
  • the concavities shown in Figures 1 and 2 are dihedrons.
  • the monolithic block 1 comprises, upline with respect to the tunnels 2 and 3, orthogonal elbows with steps 10 and 11 used to obtain a 90° change in direction.
  • FIG 2 shows a view in perspective of the monolithic block of Figure 1.
  • This block is closed on top by a flat lid 12 which is shown partially.
  • This aluminum lid is designed to adhere uniformly to the entire plane upper surface of the monolithic block 1.
  • the joining of the block 1 and of the lid 12 is done by brazing. To do so, the joining surface of the lid 12 is covered with a uniform layer of a brazing alloy on a thickness of 20 micrometers.
  • This brazing alloy is preferably formed by 60% tin and 40% lead.
  • the adhesion between the surfaces in contact of the block 1 and the lid 12 is obtained by soldering by heating the entire unit.
  • the layer of alloy covering the lid is used both as a filler metal for the brazing and as a protection layer for the lid.
  • the monolithic block 1 has pre-positioning pins 13 as well as tapped holes 14 so as to facilitate the positioning of the lid 12 with respect to the block 1 and to place this lid and block flat against each other by means of screws.
  • windows 15 and 16 are hollowed out through the lid 12 to form the exit at 90° from the elbows 10 and 11.
  • Figures 3 and 4 show the results obtained in tests on a prototype corresponding to a duplexer as shown in Figures 1 and 2, namely a duplexer covering the 12.875 GHz - 13 GHz band of frequencies in transmission and the 13.125 GHz - 13.25 GHz band of frequencies in reception.
  • the parameters S 21 and S 11 illustrated in Figures 3 and 4 respectively show the transmission losses and return losses of the duplexer of the invention.
  • Figure 3 shows the value of the parameters S 21 and S 11 on the transmission band of the duplexer and
  • Figure 4 shows the value of these parameters on the reception band.
  • the passband of the filters of the duplexer Since the frequency drift of the passband of the filters of the duplexer throughout the range of temperatures does not exceed 15 MHz around the frequency response to a temperature of 25°C, the passband of the filters of the duplexer have been widened by 30 MHz to cope with this drift. That is, the frequency band covered by the duplexer at a temperature of 25°C is taken to be equal to 12.860 GHz - 13.015 GHz for transmission and 13.110 GHz - 13.265 GHz for reception.
  • the duplexer of the invention has the following advantages:

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EP99303288A 1998-05-18 1999-04-27 Justierfreier Duplexer mit niedrigem Verlust Withdrawn EP0959519A1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP99303288A EP0959519A1 (de) 1998-05-18 1999-04-27 Justierfreier Duplexer mit niedrigem Verlust

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
EP98460013A EP0959517A1 (de) 1998-05-18 1998-05-18 Justierfreier Duplexer mit niedrigem Verlust
EP98460013 1998-05-18
EP99303288A EP0959519A1 (de) 1998-05-18 1999-04-27 Justierfreier Duplexer mit niedrigem Verlust

Publications (1)

Publication Number Publication Date
EP0959519A1 true EP0959519A1 (de) 1999-11-24

Family

ID=26151798

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99303288A Withdrawn EP0959519A1 (de) 1998-05-18 1999-04-27 Justierfreier Duplexer mit niedrigem Verlust

Country Status (1)

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EP (1) EP0959519A1 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001054272A2 (en) * 2000-01-21 2001-07-26 Telefonaktiebolaget L M Ericsson (Publ) A waveguide type duplex filter
FR2941057A1 (fr) * 2009-01-13 2010-07-16 Univ Claude Bernard Lyon Procede de gainage d'un milieu laser solide et dispositif de mise en oeuvre

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2346868A1 (fr) * 1973-05-10 1977-10-28 Cit Alcatel Filtre de separation et de reunion d'ondes electromagnetiques
JPS63308401A (ja) * 1987-06-09 1988-12-15 Nec Corp 同軸型分波器
US4890078A (en) * 1988-04-12 1989-12-26 Phase Devices Limited Diplexer

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2346868A1 (fr) * 1973-05-10 1977-10-28 Cit Alcatel Filtre de separation et de reunion d'ondes electromagnetiques
JPS63308401A (ja) * 1987-06-09 1988-12-15 Nec Corp 同軸型分波器
US4890078A (en) * 1988-04-12 1989-12-26 Phase Devices Limited Diplexer

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 13, no. 147 (E - 741) 11 April 1989 (1989-04-11) *
PFITZENMAIER G: "LINEAR PHASE MICROWAVE BANDPASS FILTERS", PROCEEDINGS OF THE EUROPEAN MICROWAVE CONFERENCE, BRUSSEL, 4-7 SEPTEMBER, 1973, vol. 2, no. CONF. 3, 4 September 1973 (1973-09-04), HOFFMAN G, pages B.2.01, XP002073863 *

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001054272A2 (en) * 2000-01-21 2001-07-26 Telefonaktiebolaget L M Ericsson (Publ) A waveguide type duplex filter
WO2001054272A3 (en) * 2000-01-21 2002-01-31 Rescom As A waveguide type duplex filter
US6710678B2 (en) 2000-01-21 2004-03-23 Telefonaktiebolaget Lm Ericsson(Publ) Waveguide type duplex filter
FR2941057A1 (fr) * 2009-01-13 2010-07-16 Univ Claude Bernard Lyon Procede de gainage d'un milieu laser solide et dispositif de mise en oeuvre
WO2010081991A1 (fr) * 2009-01-13 2010-07-22 Universite Claude Bernard Lyon I Procede de gainage d'un milieu laser solide et dispositif de mise en oeuvre

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