WO2001097324A1 - Composants electriques pour signaux haute frequence - Google Patents

Composants electriques pour signaux haute frequence Download PDF

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Publication number
WO2001097324A1
WO2001097324A1 PCT/IT2000/000240 IT0000240W WO0197324A1 WO 2001097324 A1 WO2001097324 A1 WO 2001097324A1 IT 0000240 W IT0000240 W IT 0000240W WO 0197324 A1 WO0197324 A1 WO 0197324A1
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WO
WIPO (PCT)
Prior art keywords
zama
filters
resonators
alloys
filter
Prior art date
Application number
PCT/IT2000/000240
Other languages
English (en)
Inventor
Fausto Pirovano
Giuseppe Resnati
Antonio Sala
Luigi Grana
Original Assignee
Forem S.R.L.
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 Forem S.R.L. filed Critical Forem S.R.L.
Priority to PCT/IT2000/000240 priority Critical patent/WO2001097324A1/fr
Publication of WO2001097324A1 publication Critical patent/WO2001097324A1/fr

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
    • H01P11/00—Apparatus or processes specially adapted for manufacturing waveguides or resonators, lines, or other devices of the waveguide type

Definitions

  • the present invention concerns components and apparatus even complex like filters, supports, boxes and accessories for high frequency signals.
  • the invention refers to filters at least comprising: - a base body (box-like) in metalic material, generally open at its top; - resonant cavities dug-out in said body; - resonatos projecting out of said cavity bottoms; - and means to control the tuning and possibly the inter-cavity coupling.
  • the conventional filters are made of metal material (ferreous or not-ferreous) which associate to their important advantages also the inconvenience to demand complexe machine workings and to involve thereby total relevant costs etc.. For years it has been hoped to remedy to these drawbacks by adopting filters which do not have the handicap of those made of the more used metals, requiring final delicate machine workings.
  • Applicant's Italian Patent Application N°97A 000205 describes complex filters at material diversity, comprising a box-like plastic body in which are made a first major band pass filter with n resonant cavities and a second band pass filter, m of the n resonators associated to said cavities consisting of a material different from that of the box-like body and of the resonators integral with it. A machine working is always requested for these prior Art filters.
  • First object of the present invention is now a system which allows the elimination of the Prior Art inconveniences, in particular of the above mentioned drawbacks, and to obtain even complex structures of components, especially of filters and/or amplifier containers for high frequency signals, which request practically no machine working and, at a parity of encumbrance and of electric characteristics of the conventional components, have costs lowered of even up to 65%.
  • the invention concerns a complex filter of the duplexer type.
  • FIG. 1 is a schematic top view of a first embodiment of a filter substantially made of zinc alloy with however at least a couple of aluminium resonators;
  • FIG. 2 and 3 are schematic partial cross-sections with planes having as traces lines B-B, respectively D-D in figure 1;
  • FIG. 4 is a top view (similar to that of fig. 1) of a second filter embodiment according to the invention having all the resonators of zinc alloy integral with the filter body;
  • FIG. 5 and 5' are cross-sections of the ZAMA resonators coupling the filter inside with an outdoor connector through pins passing a hole through the resonator base;
  • FIG. 6 is a front view of a coupling resonator of figures 5 and 5' during the induction soldering phase;
  • figure 7 is a top view of figure 6;
  • FIG. 8 is a frontal view of the screw system used to block a cover or cap of aluminium on a filter body of a Zn-alloys;
  • FIG. 9 is a view, from the outside, of the screw-free bottom of a ZAMA filter .
  • the inter-cavity windows or irises are indicated with the letters A, B, C, D, E, F, G, H, I.
  • the filter body CF has a thickness Se of the outer walls and a thichess Si of the internal walls. Since the new components according to the invention must be interchangeable with the conventional components, they must have the same encumbrance, i.e. outer dimensions strictly equal to those of the components made of classic material like, f.i., aluminium.
  • the basic feature of the present invention consists in that the new components are made of zinc alloys, in particularly alloys containing up to 96% Zn, and other elements, such as aluminium, Cu, Mg, Fe, Cd, Pd, Sn, in particular the alloys ZA4, ZA4C1, ZAC3, ZA8C1, ZA11C1, ZA27C2 etc., generally known and simply indicated as ZAMA alloys.
  • ZAMA alloys are standardized in the UNI-norms f.i. the norm UNI 3717 reports the following compositions:
  • said ZAMA alloys are considered a poor material showing mainly unreliable characteristics from the mechanical, electric and chemical view points; just to mention a handicap, it is at least partially corrosive. Up to to-day there was thus a prejudice against the zinc alloys, which has prevented their use in the manufacture of components, in particular of those with remarkable added value like the electric filters.
  • the last generation ZAMA alloys are: moldable under vacuum in warm (at about 350°C) chambers with the aid of pistons and relevant accessories drowned (buried) in the alloy molten mass to form articles (f.i., filters) with outer thickness Se and inner thickness Si extremely reduced (lowered) over the most favourable bodies obtained with aluminium (Al) .
  • the thermal linear expansion is about 24.10 for Al and 27.10 for the ZAMA alloys, what means that the thermal characteristics remain substantially comparable whereby it can be stated that a ZAMA filter according to the invention has a behaviour, under thermal stresses, substantially equal to that of an Al filter and finally the filters made of ZAMA are interchangeable with the filters made of Al.
  • the ZAMA alloys lend the self to be formed with very thin thicknesses, for instance up to 0.4 mm whereas with Al it is not possible to go under 2 mm. This allows to compensate the heavy specific weight of the ZAMA alloys (of about 6.5 Kilo per cubic decimeter,
  • the size of the ZAMA resonant cavities is decidedly higher than that of Al whereby the electric characteristics of the cavity filters according to the invention are far better than those of the Al filters, as knowingly the higher the cavity volume the easier and more precise the relevant filter calibration, setting and tuning.
  • the cavities keep the same volume however where and when there is no iris, one can take profit in placing therein a screw imparting thus to the cavity, shapes which appear strange but have in any case a higher volume.
  • the ZAMA moulds have a decidedly longer life (up to 15.000 strokes) than the Al moulds, especially because of the moulding lower temperatures.
  • the hammermen of generally small ZAMA articles obtain also consistent savings in the consumption of the basic material of the 10-20% order in favour of the ZAMA alloys.
  • Fig. 2 shows on an enlarged scale the portions of walls 100, 101 and of knots 103, 104, 105 etc. in which the iris free walls as well as said nodes or branch points have the shapes indicated in 100' of two semi- ellipses SE1, SE2 which increase enormously the cavity volume in correspondence to the zone in which there are no controll screws.
  • Figure 3 is the cross-section along line B-B of figure 1 and shows the resonator R3 in the cavity C3 and the separation wall P4 between C3 and C4.
  • the iris D can now be less wide and be in the superior part of the partition wall, at a parity of coupling.
  • resonators in addition to the ZAMA resonators integral with the filter body, other resonators made of a non-ZAMA material f.i. of Al can be inserted in said body.
  • the coupling resonators R'A in cavity CIO to be coupled f.i. with the connector 10 of an antenna A (not shown) and the resonator RA to be coupled with the low pass filter FPB (fig. 3) are indicated as conventional resonators, f.i., in Al, which are fixed f.i. with screws or similar conventional means SR to the bottom 20 (fig.
  • the pins PA and PB are welded to the respective resonators RA' and RB' by induction; thanks to the conductor hollow arms PZ1, PZ2 an outer power source IS surrounds with its curved terminal portions PCI, PC2 (cooled by internal liquid circulation), the outer surface of resonator RA' which is heated only in the zone of the hole H for the passage of the pin PA which, once the soldering limited zone of R'A has been sufficiently heated, is welded by a soldering ring SO to the outer coating f.i. in silver on the resonator.
  • the curved arms PCI, PC2 surrounding the resonator R'A are at a slight distance from the resonator outer surface and cause therein induction currents which generate the heat to soften and solder the pin PA to the resonator RA'.
  • the ZAMA whole body (CF + resonators) can be coated by using a first layer (8-12 ⁇ thick) of copper electrolytically (and not chemically) obtained on which is further applied a layer of electrolytic nickel (8-12 ⁇ thick) that is finally coated with a layer of silver.
  • the first two layers are to be made with electrolytically obtained metals, significantly copper and nickel on top of which is applied a silver layer.
  • a further advantage of the ZAMA alloys use is that the brackets, straps, supports, fixing elements attachements and the like (from 1 to 11 in figure 1) between complex filter components, in particular duplexers, triplexers and the like are also made of ZAMA and are integrally formed with the bodies of the components to be compacted in a stable way. This contributes not only to the production of compact integrated bodies but also to the avoidance of the difficult insertion of components in not homogeneous materials which render very delicate the connection operations.
  • figure 4 is the top view of the inside of a filter (duplexer) having all the resonators integral with the filter body, said resonators and filter body being molded all together in ZAMA alloy.
  • the filter is imagined open i.e. its cover CO (figure 8) being absent.
  • the intercavity couplings are realized with the aid of the irises or windows D, E, F, G, and also of the brigdes SC34 and SC8 on the walls P3 respectively P9.
  • These bridges consist generally of a probe embetted in a block and as they are known per se they do not need here a long description.
  • Figure 9 is a view from the outside of the bottom wall external face BW. From this fig. 9 a further important advantage can be appreciated, as there are no screws to fix the resonators to said wall BW. Indeed just because of the moulding of all the resonators at the moment of the moulding of the filter body (without cover) , there is no need of the screws fixing the resonators to the bottom wall BW.
  • Advantageously several bottom closed holes f.i. SCFl, SCF2, SCF3, SCF4, SCF5 and SCF6 are escavaded in said wall BW to extract the molded Zn filter body from the mould.
  • Figure 8 shows an aluminium cover Co.Al fixed to a Zama filter body CF.Zn through a precharged screw V of carbon steel and a washer G which initially does not fully rest on the below surface SA1 of the Al-cap; to compensate the climatic elongation difference a test in a chamber (not shown) at temperature varying from - 10 to + 70°C is carried out to precharge the elastic washer G with a torque Key of about 1.4 N/m (newton/meter) .
  • the cap in aluminium Co.Al and the filter housing in Zama-alloy CF.Zn tend to detach (separate) from each other generating an upwardly trust UT whereby the washer G goes to seat fully on the cap surface.
  • the temperature decreases the inverse behaviour takes place.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Control Of Motors That Do Not Use Commutators (AREA)

Abstract

L'invention concerne des composants pour systèmes et appareils à signaux haute fréquence, en particulier des filtres, un duplexeur, des supports, des contenants et analogues, caractérisés par un corps moulé en alliage de zinc provenant surtout de la famille ZAMA, de préférence d'alliages commercialement connus par les appellations de ZA4, ZA4C1, ZA4C3, ZA8C8.
PCT/IT2000/000240 2000-06-12 2000-06-12 Composants electriques pour signaux haute frequence WO2001097324A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/IT2000/000240 WO2001097324A1 (fr) 2000-06-12 2000-06-12 Composants electriques pour signaux haute frequence

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/IT2000/000240 WO2001097324A1 (fr) 2000-06-12 2000-06-12 Composants electriques pour signaux haute frequence

Publications (1)

Publication Number Publication Date
WO2001097324A1 true WO2001097324A1 (fr) 2001-12-20

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006043880A2 (fr) 2004-10-19 2006-04-27 Powerwave Technologies Sweden Ab Dispositif d'extraction cc
US7388458B2 (en) 2004-10-19 2008-06-17 Powerwave Technologies Sweden Ab DC extracting arrangement and a filter

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3656094A (en) * 1970-02-27 1972-04-11 Clarence B Haegert Electrical connector and method of making same
US3676744A (en) * 1970-08-10 1972-07-11 Lindsay Specialty Prod Ltd Signal splitter
US3819900A (en) * 1972-06-13 1974-06-25 Amana Refrigeration Inc Waveguide filter for microwave heating apparatus
US4278957A (en) * 1979-07-16 1981-07-14 Motorola, Inc. UHF Filter assembly
US4965046A (en) * 1988-10-04 1990-10-23 Noranda Inc. Creep resistant zinc-aluminum based casting alloy
EP0620620A1 (fr) * 1993-04-15 1994-10-19 Fabrica Electrotecnica Eunea, S.A. Bâti de support multicombinable pour appareils électriques
US5937509A (en) * 1994-09-12 1999-08-17 Matsushita Electric Industrial Co., Ltd. Method of manufacturing linear-circular polarizer

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3656094A (en) * 1970-02-27 1972-04-11 Clarence B Haegert Electrical connector and method of making same
US3676744A (en) * 1970-08-10 1972-07-11 Lindsay Specialty Prod Ltd Signal splitter
US3819900A (en) * 1972-06-13 1974-06-25 Amana Refrigeration Inc Waveguide filter for microwave heating apparatus
US4278957A (en) * 1979-07-16 1981-07-14 Motorola, Inc. UHF Filter assembly
US4965046A (en) * 1988-10-04 1990-10-23 Noranda Inc. Creep resistant zinc-aluminum based casting alloy
EP0620620A1 (fr) * 1993-04-15 1994-10-19 Fabrica Electrotecnica Eunea, S.A. Bâti de support multicombinable pour appareils électriques
US5937509A (en) * 1994-09-12 1999-08-17 Matsushita Electric Industrial Co., Ltd. Method of manufacturing linear-circular polarizer

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006043880A2 (fr) 2004-10-19 2006-04-27 Powerwave Technologies Sweden Ab Dispositif d'extraction cc
WO2006043879A1 (fr) 2004-10-19 2006-04-27 Powerwave Technologies Sweden Ab Filtre
WO2006043880A3 (fr) * 2004-10-19 2007-09-27 Powerwave Technologies Sweden Dispositif d'extraction cc
US7388458B2 (en) 2004-10-19 2008-06-17 Powerwave Technologies Sweden Ab DC extracting arrangement and a filter
CN100568616C (zh) * 2004-10-19 2009-12-09 动力波技术瑞典股份公司 滤波器
CN100568615C (zh) * 2004-10-19 2009-12-09 动力波技术瑞典股份公司 直流提取装置

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