EP1812986A1 - Hochfrequenzfilter - Google Patents
HochfrequenzfilterInfo
- Publication number
- EP1812986A1 EP1812986A1 EP05795621A EP05795621A EP1812986A1 EP 1812986 A1 EP1812986 A1 EP 1812986A1 EP 05795621 A EP05795621 A EP 05795621A EP 05795621 A EP05795621 A EP 05795621A EP 1812986 A1 EP1812986 A1 EP 1812986A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- housing
- frequency filter
- recesses
- filter according
- resonators
- 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.)
- Granted
Links
- 239000004020 conductor Substances 0.000 claims abstract description 69
- 238000000034 method Methods 0.000 claims abstract description 11
- 230000008878 coupling Effects 0.000 claims description 63
- 238000010168 coupling process Methods 0.000 claims description 63
- 238000005859 coupling reaction Methods 0.000 claims description 63
- 230000003313 weakening effect Effects 0.000 claims description 6
- 238000004519 manufacturing process Methods 0.000 description 11
- 238000003801 milling Methods 0.000 description 9
- 238000005266 casting Methods 0.000 description 6
- 230000018109 developmental process Effects 0.000 description 2
- 230000004044 response Effects 0.000 description 2
- 241001494479 Pecora Species 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000005352 clarification Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 230000012447 hatching Effects 0.000 description 1
- NJPPVKZQTLUDBO-UHFFFAOYSA-N novaluron Chemical compound C1=C(Cl)C(OC(F)(F)C(OC(F)(F)F)F)=CC=C1NC(=O)NC(=O)C1=C(F)C=CC=C1F NJPPVKZQTLUDBO-UHFFFAOYSA-N 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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
- H01P1/205—Comb or interdigital filters; Cascaded coaxial cavities
-
- 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
- H01P1/205—Comb or interdigital filters; Cascaded coaxial cavities
- H01P1/2053—Comb or interdigital filters; Cascaded coaxial cavities the coaxial cavity resonators being disposed parall to each other
-
- 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
- H01P11/007—Manufacturing frequency-selective devices
Definitions
- the invention relates to a high-frequency filter in coaxial design, in particular in the manner of a high-frequency filter (such as duplexer) or a band-pass filter or band-stop filter.
- the invention further relates to a method for tuning and / or producing a high-frequency filter.
- a common antenna is often used for transmit and receive signals.
- the transmit and receive signals each use different frequency ranges, and the antenna must be suitable for transmitting and receiving in both frequency ranges.
- a suitable Frequenz ⁇ filtering is required, with the one hand the Sendesigna ⁇ le from the transmitter to the antenna and on the other hand the Empfangs ⁇ signals are forwarded from the antenna to the receiver the.
- inter alia high-frequency filters in coaxial design are used today. For example, a pair of high-frequency filters can be set, both of which transmit a specific frequency band (bandpass filter).
- a pair of high frequency filters may be used, both of which block a certain frequency band (band elimination filter).
- a pair of high frequency filters may be used, one of which passes frequencies below a frequency between transmit and receive bands and blocks frequencies above that frequency (low pass filter), and the other filter blocks frequencies below a frequency between transmit and receive bands and overlying Passing through frequencies (high-pass filter).
- High frequency filters are often manufactured in the form of coaxial TEM resonators. These resonators can be manufactured inexpensively and economically from milling or casting parts and they ensure a high electrical quality as well as a relatively high temperature stability.
- high-frequency filters which comprise an outer conductor housing in which a plurality of coaxial Hohl ⁇ are formed spaces in each of which an inner conductor is arranged in the form of an inner conductor tube.
- a plurality of juxtaposed resonators is formed, wherein adjacent resonators are coupled elek ⁇ trically via coupling openings with each other.
- the outer conductor housing such high-frequency filter is nowadays usually produced by casting or milling, whereby by appropriate choice or size and shape of the coupling openings and the distance between adjacent resonators, the desired response of the filter can be generated. Since tolerances can occur during the production of such high-frequency filters, it is usually necessary to mechanically rework the outer conductor housing. The reworking is usually carried out by milling the coupling openings. In this case, it proves to be disadvantageous that when the filter is reworked, the coupling openings can only be increased, which leads to a strengthening of the electrical coupling between adjacent resonators. In particular, it is no longer possible to reduce the size of a milled opening that is too large in order to reduce the electrical coupling.
- a filter using coaxial resonators has also become known, for example, from US Pat. No. 4,307,357. There it is shown, for example, that the individual coaxial resonators connecting wall openings in the housing does not have to extend down to the floor level of a single Koaxialresona ⁇ gate, but that here the Bodenflä ⁇ surface may run at a different level, for example, in this area is higher than the usual ground level and thus a kind of pedestal, threshold, level, etc. is formed.
- a coaxial comb-line filter which comprises a housing with a cavity in which rods are arranged. Each rod is integrally formed with one end to the housing. The other end of the rod extends into the cavity and ends in a certain relative position to De ⁇ ckel.
- the object of the invention is to fen for schaf ⁇ a contrast improved high frequency filter "starting said DEN- last two generic high-frequency filters, which is connected to and cheaper her ⁇ less effort adjustable.
- the object of the invention is also to provide a simpler and cheaper tuning and / or manufacturing method for a high frequency filter.
- the invention is based on the finding that such depressions lead to a weakening of the electrical coupling between adjacent resonators.
- the degree of coupling is determined by the lateral expansion and the depth of the depressions.
- the high-frequency filter according to the invention can thus be tuned and produced with little processing effort.
- the tuning of the filter can in particular also be iterative, ie the coupling between adjacent resonators can be tuned alternately by increasing the coupling openings and attaching recesses until the desired frequency response has been achieved.
- the filter according to the invention is also considerably less expensive since less waste is produced during its production. In addition, the development time for the filter is reduced and a cost-effective casting tool for the outer conductor housing can be used.
- a particularly effective weakening of the coupling is achieved in a preferred embodiment of the filter according to the invention in that one or more of the recesses lie in a plan view of the housing bottom adjacent to a coupling opening and / or at least partially within a coupling opening between adjacent resonators.
- adjacent resonators in plan view of the Gezzaus ⁇ bottom at least 50%, in particular 70% to 100%, particularly preferably 80% to 100% of the surface of one or more of the "wells between two inner conductor tubes of adjacent resonators are formed, within the at least one coupling openings between the adjacent resonators.
- a plurality of depressions are arranged between at least part of the inner conductor tubes of adjacent resonators, which are arranged next to each other and / or in the longitudinal direction and / or in the transverse direction offset from each other in the longitudinal direction of the outer conductor housing ,
- the depressions arranged in the housing bottom can have any shapes and depth profiles.
- the recesses may be circular, rectangular, for example square, and / or star-shaped in plan view of the housing bottom.
- the depressions may also have any other shapes.
- the depth profile of the depressions can be, for example, V-shaped and / or U-shaped.
- the depth profile can taper downwards and / or widen.
- Other possible shapes of the depth profile are cylindrical, conical or dome-shaped shapes.
- the wells are further holes and / or cutouts in the housing bottom.
- At least part of the inner conductor tubes are galvanically connected at their lower ends to the housing bottom and preferably have a cylindrical and / or rectangular and / or hexagonal or polygonal shape.
- the mechanical length of the individual inner conductor tubes is substantially 1/4 of the wavelength of the resonant frequency of the respective resonators.
- an electrically conductive cover is arranged on the upper side of the outer conductor housing.
- the resonators of the filter according to the invention are designed and coupled in such a way that a duplex or a bandpass filter or a band-stop filter are formed.
- the filter is in particular designed such that it operates in the mobile radio frequency range, in particular in the GSM and / or UMTS mobile radio frequency range.
- the invention further relates to a method for tuning the electrical high-frequency characteristics of a high-frequency filter, in particular the electrical coupling of the resonators of a high-frequency filter, wherein the Schisse ⁇ tion of electrical coupling of adjacent resonators between at least a portion of the inner conductor tubes of adjacent resonators one or more Ver ⁇ recesses are formed in the housing bottom.
- the tuning method preferably comprises, as a further method step, the enlargement of one or more of the coupling openings in the outer conductor housing, in particular the milling of the coupling openings, whereby the electrical coupling between adjacent resonators is enhanced.
- the desired frequency behavior can be adjusted iteratively, wherein the electrical coupling is increased on the one hand by enlarging the coupling openings and on the other hand is lowered by the formation of corresponding recesses in the housing bottom.
- the invention also relates to a manufacturing method for a high-frequency filter, wherein the filter is tuned at the end of the method with the aid of the tuning method just described.
- the production of the filter is very simplified.
- less rejects are produced because excessive electrical coupling, which is caused by a too large milled coupling opening, can be compensated for by corresponding recesses in the housing bottom.
- FIG. 1 shows a plan view of an embodiment of a high-frequency filter according to the invention
- Figure 2 is a sectional view taken along line I-I of the filter of Figure 1;
- FIG. 3 shows a plan view of an alternative embodiment of a high-frequency filter according to the invention
- Figure 5 is a modified to Figure 1 plan view of a modified embodiment in the neck.
- FIG. 6 shows a cross-sectional view along the line VI-VI in FIG. 5.
- FIG. 1 shows a plan view from above of a high frequency filter in the form of a fourcircular microwave filter.
- the filter comprises an electrically conductive outer conductor housing 1, which is preferably a milling or casting.
- the outer conductor housing comprises a rectangular housing bottom Ib and a circumferential side wall Ia, which is arranged at the edge of the housing bottom Ib.
- On the upper Side of the housing 1 is usually a lid ange ⁇ introduced, which is not shown in Figure 1.
- Inside the housing are four adjacently arranged resonators Rl, R2, R3 and R4, which are formed in square cavities with rounded corners in the housing 1. Adjacent cavities are connected to each other via so-called coupling openings 3, 4 and 5.
- Adjacent resonators are electrically coupled to one another via the openings 3, 4 and 5, respectively.
- the coupling openings are shutters which are laterally delimited in the housing 1 by two opposing projections 6, 7 and 8, respectively.
- the size of the diaphragms 3, 4 and 5 can influence the electrical coupling between the adjacent resonators. It can be seen in Figure 1 that the openings 3, 4 and 5 are designed differently, in particular, the middle Koppel ⁇ opening 4 in the longitudinal direction X and in the transverse direction Y of the housing has a smaller width than the coupling openings 3 and 5. The smaller width is through the protrusions 7 causes which are narrower than the projections 6 and 8 and extend further into the housing interior.
- the electrical coupling between the resonators is influenced in particular by the width of the coupling openings in the transverse direction Y.
- the coupling between the individual resonators is increased by an enlargement of the aperture.
- This property is utilized in the production of the high-frequency filter in order to compensate for tolerances which occur when the casting tool is produced for the outer conductor housing or during the actual casting or milling process of the outer conductor housing. Since only an increase in the coupling between adjacent resonators can be achieved by the widening of the aperture opening, in the embodiment of the filter according to the invention described here, the coupling between the resonators is further provided by circular depressions or apertures arranged in the aperture openings 9 influences.
- the filter according to the invention is much easier to produce in contrast to known filters.
- known filters the K ⁇ ppelö Anlagenen must first be performed aus ⁇ too small, so by successive re-milling of ⁇ ff ⁇ voltages the electrical coupling to the desired level can be adjusted because there is no way to attenuate too strong electrical coupling due to a too large aperture again.
- the manufacturing process is therefore very time-consuming and, if the coupling opening is widened too far, immediately leads to the loss of the entire filter housing.
- the production of the filter according to the invention is much simpler, since an excessively large coupling opening can be compensated for again by the attachment of the recesses 9 in the housing bottom.
- the outer conductor housing with the desired size of the coupling openings can first be produced, and any error tolerances can then be compensated iteratively either by a further widening of the coupling opening or by the provision of corresponding depressions.
- the recesses are hereby preferably milled by appropriate milling tools in the bottom of the outer conductor housing. However, it is also possible to drill the recesses into the housing bottom with a drilling tool.
- the geometric shape and depth as well as the position of the individual depressions can be variable.
- elongated depressions in the form of a groove or rectangular depressions can also be used.
- These depressions can also have different depth profiles, in particular the side walls of the depressions can taper downwards, which leads to a conical profile shape of the depression in the case of a circular depression.
- the depressions can of course also be widened downwards.
- several depressions between see two adjacent inner conductor tubes 2 may be arranged.
- the recesses may be arranged side by side and / or offset from one another in the X direction next to each other and / or in the Y direction, and they may all have the same shape or partially the same shape or all different shapes.
- FIG. 3 shows a view similar to FIG. 1 of a high-frequency filter which has recesses with different shapes. It is here between the resonator Rl and R2, an elongated recess 91 is provided, which extends in the Y direction. Between the resonator R2 and R2, a star-shaped recess 92 is formed and between the resonator R3 and R4 an obliquely extending, elongated recess 93 is arranged. All recesses 91, 92 and 93 lie wholly or partly within the coupling openings between the adjacent resonators.
- FIG. 4 shows a view analogous to FIG. 2, wherein a filter with different depth profiles of the depressions is shown.
- the recess 94 between the resonator Rl and R2 is designed conically downwards, while wo ⁇ the depression between the resonator R2 and R3 the Has a shape of a dome.
- the recess 96 between resonator R3 and R4 has a V-shaped profile. All of the geometrical shapes, positions and profiles of the recesses described above are merely exemplary and any shapes, orientations and profile configurations are possible, which can also be combined with one another as desired.
- the bottom surface 1b, 1b ' can also run at different levels in different regions of the high-frequency filter. If appropriate, this applies to the height level of the individual floor areas Ib in each individual resonator in the immediate vicinity of the inner conductor 2, but above all in the area of the coupling opening.
- the coupling opening can be designed to lie above the other level of the housing bottom 1b, so that a kind of step, threshold or type of platform is formed, in particular in the area of the coupling opening 3, so that the upwardly facing bottom surface 1b, here as the housing bottom Ib ', is higher than neigh ⁇ barte portions of the provided with the reference numeral Ib housing bottom.
- the width in the coupling direction of this higher-lying bottom Ib ' may, for example, correspond to the housing width of the coupling opening.
- Figure 5 is dashed lines .aber indicated that the bottom surface Ib 'in this area may also have a greater width or longitudinal extent, which over the thickness of the adjacent housing wall 1' that is the thickness of the housing wall 1 'adjacent to the Koppelöff ⁇ tion 3 surmounted.
- Ib ' are also the mentioned recesses provided the recess 9 and introduced in order to achieve the ge desired explained improvements.
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Control Of Motors That Do Not Use Commutators (AREA)
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102004055707A DE102004055707B3 (de) | 2004-11-18 | 2004-11-18 | Hochfrequenzfilter und Verfahren zur Abstimmung der Hochfrequenzeigenschaften eines Hochfrequenzfilters |
| PCT/EP2005/010781 WO2006053607A1 (de) | 2004-11-18 | 2005-10-06 | Hochfrequenzfilter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP1812986A1 true EP1812986A1 (de) | 2007-08-01 |
| EP1812986B1 EP1812986B1 (de) | 2008-01-23 |
Family
ID=35447361
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP05795621A Expired - Lifetime EP1812986B1 (de) | 2004-11-18 | 2005-10-06 | Hochfrequenzfilter |
Country Status (6)
| Country | Link |
|---|---|
| EP (1) | EP1812986B1 (de) |
| CN (1) | CN101076917B (de) |
| AT (1) | ATE385051T1 (de) |
| DE (2) | DE102004055707B3 (de) |
| ES (1) | ES2299094T3 (de) |
| WO (1) | WO2006053607A1 (de) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102006033704B3 (de) | 2006-07-20 | 2008-01-03 | Kathrein-Werke Kg | Hochfrequenzfilter in koaxialer Bauweise, insbesondere nach Art einer Hochfrequenzweiche (z.B. einer Duplex-Weiche) oder eines Bandpassfilters oder Bandsperrfilters |
| US7777593B2 (en) | 2006-12-27 | 2010-08-17 | Kathrein-Werke Kg | High frequency filter with blocking circuit coupling |
| DE102013020428A1 (de) | 2013-12-05 | 2015-06-11 | Kathrein-Werke Kg | Hochfrequenzfilter in koaxialer Bauweise |
| JP6372413B2 (ja) * | 2014-07-07 | 2018-08-15 | 株式会社村田製作所 | フィルタ装置 |
Family Cites Families (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3516030A (en) * | 1967-09-19 | 1970-06-02 | Joseph S Brumbelow | Dual cavity bandpass filter |
| JPS5390741A (en) * | 1977-01-21 | 1978-08-09 | Nec Corp | Band pass filter |
| US4307357A (en) * | 1980-03-04 | 1981-12-22 | Tektronix, Inc. | Foreshortened coaxial resonators |
| US4342969A (en) * | 1980-10-06 | 1982-08-03 | General Electric Company | Means for matching impedances between a helical resonator and a circuit connected thereto |
| US5329687A (en) * | 1992-10-30 | 1994-07-19 | Teledyne Industries, Inc. | Method of forming a filter with integrally formed resonators |
| JPH07245513A (ja) * | 1994-03-07 | 1995-09-19 | Sumitomo Metal Ind Ltd | 高周波用誘電体共振器及びその共振周波数の調整方法 |
| US5894250A (en) * | 1997-03-20 | 1999-04-13 | Adc Solitra, Inc. | Cavity resonator filter structure having improved cavity arrangement |
| FI982551L (fi) * | 1998-06-11 | 1999-12-12 | Lk Products Oy | Yhtenäisistä kappaleista muodostuva suurtaajuussuodatin |
| US6081175A (en) * | 1998-09-11 | 2000-06-27 | Radio Frequency Systems Inc. | Coupling structure for coupling cavity resonators |
| US6064285A (en) * | 1998-12-11 | 2000-05-16 | Wavecom Electronics Inc | Printed circuit board helical resonator and filter apparatus |
| DE19901265C1 (de) * | 1999-01-15 | 2000-06-08 | Bosch Gmbh Robert | Hohlraumresonator mit Mitteln zur Abstimmung seiner Resonanzfrequenz |
| US6611183B1 (en) * | 1999-10-15 | 2003-08-26 | James Michael Peters | Resonant coupling elements |
-
2004
- 2004-11-18 DE DE102004055707A patent/DE102004055707B3/de not_active Expired - Fee Related
-
2005
- 2005-10-06 CN CN2005800393461A patent/CN101076917B/zh not_active Expired - Fee Related
- 2005-10-06 WO PCT/EP2005/010781 patent/WO2006053607A1/de not_active Ceased
- 2005-10-06 ES ES05795621T patent/ES2299094T3/es not_active Expired - Lifetime
- 2005-10-06 EP EP05795621A patent/EP1812986B1/de not_active Expired - Lifetime
- 2005-10-06 AT AT05795621T patent/ATE385051T1/de not_active IP Right Cessation
- 2005-10-06 DE DE502005002703T patent/DE502005002703D1/de not_active Expired - Lifetime
Non-Patent Citations (1)
| Title |
|---|
| See references of WO2006053607A1 * |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2006053607A1 (de) | 2006-05-26 |
| WO2006053607A8 (de) | 2007-06-14 |
| CN101076917B (zh) | 2011-08-31 |
| DE102004055707B3 (de) | 2006-04-27 |
| ATE385051T1 (de) | 2008-02-15 |
| ES2299094T3 (es) | 2008-05-16 |
| DE502005002703D1 (de) | 2008-03-13 |
| EP1812986B1 (de) | 2008-01-23 |
| CN101076917A (zh) | 2007-11-21 |
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