CN1187863C - Dielectric filter and communication apparatus - Google Patents
Dielectric filter and communication apparatus Download PDFInfo
- Publication number
- CN1187863C CN1187863C CNB011249781A CN01124978A CN1187863C CN 1187863 C CN1187863 C CN 1187863C CN B011249781 A CNB011249781 A CN B011249781A CN 01124978 A CN01124978 A CN 01124978A CN 1187863 C CN1187863 C CN 1187863C
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- inner wire
- hole
- dielectric filter
- forms
- medium block
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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
- H01P1/205—Comb or interdigital filters; Cascaded coaxial cavities
- H01P1/2056—Comb filters or interdigital filters with metallised resonator holes in a dielectric block
-
- 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
- H01P1/207—Hollow waveguide filters
- H01P1/208—Cascaded cavities; Cascaded resonators inside a hollow waveguide structure
- H01P1/2084—Cascaded cavities; Cascaded resonators inside a hollow waveguide structure with dielectric resonators
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P7/00—Resonators of the waveguide type
- H01P7/10—Dielectric resonators
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- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Control Of Motors That Do Not Use Commutators (AREA)
Abstract
Provided is a dielectric filter and communication equipment provided with the same, with which the deterioration of filter characteristics caused by the deterioration of Qodd is suppressed when the dielectric filter is miniaturized by narrowing the pitch of inner conductor forming holes inside a dielectric block. Inside an almost parallelopiped dielectric block 1, inner conductor forming holes 2a and 2b are provided while forming inner conductors 3a and 3b on inner surfaces thereof and an outer conductor is formed on the outer surface of the dielectric block. When the interval of arranging the inner conductor forming holes in the direction of location is defined as a pitch (p) and a width vertical to the locating direction of inner conductor forming holes is defined as thickness (d), however, p/d is made <=0.6 and the axes of adjacent inner conductor forming holes are made eccentric to be mutually separated in the direction of the thickness.
Description
Technical field
The present invention relates to inside, be arranged on the inner wire that forms inner wire on the inner face and form the hole, and on the outside of medium block, form the dielectric filter and the communicator that comprises this filter of outer conductor at medium block.
Background technology
Figure 19 represents the structure example of dielectric filter in the past.Wherein, (A) rearview of expression dielectric filter, (B) expression vertical view, (C) expression front view, (D) expression right side view.In the inside of the medium block 1 of rectangular shape roughly, be arranged on and form inner wire 3a on the inner face, the inner wire of 3b forms hole 2a, 2b.Go up the formation outer conductor in the outside of medium block 1 (six faces).Form hole 2a at inner wire, near the opposing party's of 2b the end, the non-formation g of portion of inner wire is set, and with the open end of this part as the inner wire of resonance circuit.
In the dielectric filter in the past of working medium piece, must determine aforementioned inner wire to form the shaft length in hole by resonance frequency, and determine width (inner wire forms the width of the configuration direction in the hole) size of medium block by design.Therefore, shorten aforementioned inner wire and form hole 2a, the between centers of 2b is every (resonator spacing (pitch)), and the inner wire that dwindles medium block forms the width of the configuration direction in hole, is effective for integral miniaturization.
But, if aforementioned resonator spacing is in case shorten the problem that then has Q0 (Qodd) deterioration of even pattern, the shoulder of bandpass characteristics (near the characteristic of the attenuation band territory side of passing through the band territory) to worsen.
Summary of the invention
The purpose of this invention is to provide and can suppress the filtering characteristic that the deterioration owing to aforementioned Qodd causes and worsen, and work for integral miniaturization dielectric filter and use its communicator.
Dielectric filter of the present invention, comprise: the medium block of rectangular shape, be arranged on the inside of the medium block of described rectangular shape, its inner wire that roughly forms inner wire in parallel to each other on inner face forms the hole, and the outer conductor that on the outside of described medium block, forms, wherein, described inner wire begins to be formed into and described the 1st relative the 2nd from the 1st of described medium block, when forming the configuration space of hole on described the 1st length direction with described inner wire is spacing, and when being thickness with the width vertical with described the 1st length direction, the ratio of spacing and thickness is less than 0.6, the axle that makes the inner wire of adjacency form hole at least a portion simultaneously departs from and is positioned at the described thickness direction centre center line parallel with described length direction, so as on described thickness direction reciprocally away from.
Adopt this structure, even then the configuration space of the configuration direction in inner wire formation hole is extremely narrow, also can expand the interval that inner wire forms the hole, the inner wire of mitigation adjacency forms the current concentration between the hole, improves Qodd.But the effect of improving of the value of spacing/thickness and Qodd has certain relation, as described later, when spacing/thickness less than 0.6 the time, by means of making inner wire form hole off-centre, can obtain the effect of improving of Qodd.
In addition, in dielectric filter of the present invention,
Make described inner wire form the elliptical shape of section on described thickness direction, extending of hole at least a portion.
Adopt this structure, then can easily carry out forming coupling between the resonator in hole based on the inner wire of adjacency.
In addition, communicator of the present invention,
Aforementioned dielectric filter is arranged on the signal processing high-frequency circuit part that for example sends signal or received signal.
Description of drawings
Fig. 1 represents the perspective view of the dielectric filter relevant with the invention process form 1.
Fig. 2 represents the interval for regulation, and the internal diameter that the inner wire with same dielectric filter of trying to achieve forms the hole is the result of the Qo of parameter to the relation of the offset in inner wire formation hole.
Fig. 3 represents the interval for other, and the internal diameter that the inner wire with same dielectric filter of trying to achieve forms the hole is the result of the Qo of parameter to the relation of the offset in inner wire formation hole.
Fig. 4 represents the interval for other, and the internal diameter that the inner wire with same dielectric filter of trying to achieve forms the hole is the result of the Qo of parameter to the relation of the offset in inner wire formation hole.
Fig. 5 represents the interval for other, and the internal diameter that the inner wire with same dielectric filter of trying to achieve forms the hole is the result of the Qo of parameter to the relation of the offset in inner wire formation hole.
Fig. 6 represents the interval for other, and the internal diameter that the inner wire with same dielectric filter of trying to achieve forms the hole is the result of the Qo of parameter to the relation of the offset in inner wire formation hole.
Fig. 7 represents that the inner wire for regulation forms the internal diameter in hole, and the Qo that is spaced apart parameter with same dielectric filter that tries to achieve forms the result of relation of the offset in hole to inner wire.
Fig. 8 represents that the inner wire for other forms the internal diameter in hole, and the Qo that is spaced apart parameter with same dielectric filter that tries to achieve forms the result of relation of the offset in hole to inner wire.
Fig. 9 represents that the inner wire for other forms the internal diameter in hole, and the Qo that is spaced apart parameter with same dielectric filter that tries to achieve forms the result of relation of the offset in hole to inner wire.
Figure 10 represents that the inner wire for other forms the internal diameter in hole, and the Qo that is spaced apart parameter with same dielectric filter that tries to achieve forms the result of relation of the offset in hole to inner wire.
Figure 11 represents to be used to obtain the offset of only Qodd to graph of a relation at interval.
Figure 12 represents to be used to obtain the Qodd of only Qodd to right at interval graph of a relation.
Figure 13 represents the structure chart of the dielectric filter relevant with the invention process form 2.
Figure 14 represents the structure chart of the dielectric filter relevant with the invention process form 3.
Figure 15 represents the structure chart of the dielectric filter relevant with the invention process form 4.
Figure 16 represents the structure chart of the dielectric filter relevant with the invention process form 5.
Figure 17 represents the structure chart of the dielectric duplexer relevant with the invention process form 6.
Figure 18 represents the block diagram of the communicator relevant with the invention process form 7.
Figure 19 represents the structure chart of dielectric filter in the past.
Embodiment
Below, describe implementing best example of the present invention with reference to accompanying drawing.
Example 1
Below, describe with reference to Fig. 1-Figure 12 pair of structure and characteristic with the dielectric filter of the invention process morphologic correlation.
Fig. 1 represents the perspective view of dielectric filter.(A) rearview of expression dielectric filter, (B) expression vertical view, (C) expression front view, (D) expression right side view.In the inside of the medium block 1 of rectangular shape roughly, be arranged on and form inner wire 3a on the inner face, the inner wire of 3b forms hole 2a, 2b.In addition, go up the formation outer conductor in the outside of medium block 1 (six faces).Form hole 2a at inner wire, near the opposing party's of 2b the end, the non-formation g of portion of inner wire is set, and with the open end of this part as the inner wire of resonance circuit.Inner wire forms hole 2a, and 2b only forms the eccentric s of center line of the configuration direction in hole from the inner wire of medium block 1, so as mutually away from.Thus, make the span L in inner wire formation hole longer than spacing p.
Fig. 2-Fig. 6 makes aforementioned intervals arrive the 1.6mm range at 2.4mm, and the internal diameter Φ that obtains with inner wire formation hole is the result of value parameter, Q0 to the value of the offset (s shown in Figure 1) in inner wire formation hole.
In Fig. 2-Fig. 6, the ha in the D score presentation graphs 1 is that inner wire forms the distance that hole 2a leaves the bottom surface of medium block, " on " hb in the presentation graphs 1, be the distance that central shaft that the opposing party's inner wire forms hole 2b leaves the bottom surface." up and down " s in the presentation graphs 1 is the offset that 2 inner wires at the center of leaving medium block (central authorities' height) form holes.L in " between the hole " presentation graphs 1 is the interval that inner wire forms the hole.In addition, Qo is the Q0 of even pattern, and Qe is the Q0 of strange pattern.Here, in size shown in Figure 1, d is fixed into 4.0mm, and w is fixed into 6.0mm, and resonance frequency fo is 1920 (MHz).
Fig. 7-Figure 10 be make internal diameter Φ that inner wire forms the hole at 1.2mm to the 0.6mm range, obtain with the spacing be parameter, Qo is to the result of the relation of offset.By the result as seen, irrelevant with internal diameter Φ, when spacing=2.4mm, along with offset greater than 0, Qodd reduces.
In addition, it is parameter that Figure 11 shows the internal diameter Φ that forms the hole with inner wire, when obtaining varied pitch, Qo is the result of maximum optimum offset.If for example Φ=1.0mm, spacing are 2.4mm, when then offset was 0mm, Qo was maximum.In addition, if for example Φ=1.0mm, spacing are 2.2mm, when then offset was 0.1mm, Qo was maximum.
This shows that during spacing/thickness=2.4/4=0.6, if make inner wire form hole off-centre, then Qo reduces.Otherwise spacing/thickness is less than 0.6 o'clock, make inner wire form hole off-centre can work for the improvement of Qo.
In addition, Figure 12 shows the position off-centre that makes inner wire form the hole, Qo is carried out the occasion and the uninfluenced occasion of optimumization, only Qo curve.By this result as seen, when spacing increases, spacing/thickness is greater than 0.6 (promptly, during spacing=2.4mm), less than the effect of improving based on the Qo of off-centre
Example 2
Below, describe with reference to the structure of Figure 13 pair of dielectric filter relevant with the invention process form 2.Figure 13 is the figure corresponding to (A) among Fig. 1, is the direction of principal axis view that inner wire forms the hole.Different with structure shown in Figure 1 is to make inner wire form hole 2a, 2b be with upwardly extending cross section, the vertical side elliptical shape of the configuration direction in each inner wire formation hole.The value of the size Expressing mm unit among the figure.
Flat partially by means of making inner wire form the cross sectional shape in hole like this with the configuration direction that forms the hole perpendicular to inner wire, can improve the degree of freedom of Design of Filter, and can be coupled to resonator, and can obtain optimumization based on eccentric up and down Qo with the desired degree of coupling.That is to say,,, just can as long as increase offset having in the design of identical electric capacity with the occasion in the inner wire formation hole that the cross section circle is set for obtaining though increasing the mutual electric capacity of resonator by means of the cross section elliptical shape.Therefore, size and offset by means of determining long limit (major axis) respectively can be coupled to resonator with the desired degree of coupling, and can obtain only Qo.
Example 3
Below, describe with reference to the structure example of Figure 14 pair of dielectric filter relevant with the invention process form 3.(A) rearview of expression dielectric filter, (B) expression vertical view, (C) expression front view, (D) expression right side view.Different with dielectric filter shown in Figure 1, form the internal diameter in hole than the distolateral thick ledge structure of short circuit for open distolateral inner wire in this example.And, the distolateral internal diameter of on the direction that forms configuration direction in hole perpendicular to inner wire, extending and open, and make separately inner wire form the center of the distolateral major axis of the opening in hole and come on the center line of thickness direction of medium block.According to this structure, can not increase the width that inner wire forms the configuration direction in hole, and can increase the capacitive couplings between resonator, expansion is by band field width degree.
Example 4
Figure 15 represents the structure chart of the dielectric filter relevant with the invention process form 4.This dielectric filter is different with the dielectric filter of structure shown in Figure 1, makes the open end and the short-circuit end in 2 inner wires formation holes reverse, makes 2 resonator interdigital couplings.Because form the Qo of the cross sectional shape decision resonator in hole by inner wire, so no matter be conllinear coupling or interdigital coupling, spacing/thickness is all identical with aforesaid example with the relation that Qo based on the off-centre in inner wire formation hole improves effect.
Example 5
Figure 16 represents that the inner wire of the dielectric filter relevant with the invention process form 5 forms the direction of principal axis view in hole.In this example, in medium block, form 2a, 2b, the 2c that 3 inner wires form the hole.This is equivalent to 2 grades of resonators shown in Figure 13 are made 3 grades.Like this,, also can form the eccentric shaft in hole by means of the inner wire that makes adjacency even in the occasion that constitutes resonator more than 3 grades, so as on the thickness direction in medium block mutually away from, in the deterioration that suppresses Qodd, the miniaturization of working for wholely.
Example 6
Below, with reference to Figure 17 the structure example of the dielectric duplexer of embodiment 6 is described.
The front view of installed surface is seen in Figure 17 (A) expression from the front, (B) expression left side view, (C) expression right side view, (D) expression vertical view.In the medium block of rectangular shape, be provided with a plurality of inner wires shown in the 2a-2n and form the hole, in 2a-2i, form with near the end of each My World as the inner wire of the resonance circuit of the non-formation of electrode portion.No matter these inner wires is open distolateral if forming the hole or short circuit is distolateral, all be forming upwardly extending cross section, the side elliptical shape of the configuration direction in hole perpendicular to inner wire, and it is thick to open the distolateral internal diameter internal diameter more distolateral than short circuit.Form outer conductor 4 in the outside of medium block (six faces), and form input and output electrode 5rx, 5ant, 5tx respectively in the place of regulation.In addition, on the inner face of inner wire formation hole 2j, 2m, integrally form inner wire as grounding electrode.In addition, also integrally form inner wire though form at inner wire on the inner face of hole 2k, 2n, make they the opposing party the end respectively with input and output electrode 5ant, 5tx conducting.
Input and output electrode 5rx forms near the capacitive coupling open end of inner wire of hole 2a, 2b inner face with inner wire respectively.In addition, form the inner wire that forms among the 2k of hole, form the resonance circuit interdigital coupling of the inner wire formation of hole 2e, 2f inner face as the exciting circuit respectively with inner wire at inner wire.Similarly, form the inner wire that forms among the 2n of hole, form the resonance circuit interdigital coupling of the inner wire formation of hole 2h, 2I inner face as the exciting circuit respectively with inner wire at inner wire.
According to this structure, 5 grades of resonators that form hole 2a-2e based on inner wire are as receiving filter, and input and output electrode 5rx is as the received signal output, and input and output electrode 5ant is as antenna end.Input and output electrode 5rx and the 2nd grade of resonator jump and are coupled, and produce attenuation pole in the low territory in receiving belt territory side (with a side that sends band territory adjacency), and attenuation characteristic is improved.In addition, based on 4 resonators of inner wire formation hole 2f-2i, as transmitting filter.Wherein, based on the resonator of inner wire formation hole 2i,, the attenuation characteristic that sends band high territory, territory side (with a side of receiving belt territory adjacency) is improved as trapper.
Like this, by means of making the inner wire that is arranged in the medium block form the distolateral eccentric shaft of short circuit in hole, so that on the thickness direction of the configuration direction that forms the hole perpendicular to inner wire away from, can shorten the width that inner wire forms the configuration direction in hole, and the miniaturization of working for wholely.
Example 7
Below, describe with reference to the structure example of Figure 18 pair of communicator relevant with the invention process form 7.In Figure 18, ANT represents transmission/reception antennas, and DPX represents duplexer, and BPFa, BPFb represent band pass filter respectively, and AMPa, AMPb represent amplifying circuit respectively, and MIXa, MIXb represent frequency mixer respectively, and OSC represents oscillator, and SYN represents frequency synthesizer.
MIXa mixes with the signal of exporting from SYN modulation signal, and BPFa only allows and passes through from the transmission frequency band territory in the mixed output signal of MIXa, and AMPa carries out power amplification to it, and is sent by ANT by DPX.AMPb amplifies the received signal of taking out from DPX.BPFb only allows and is passed through by the receive frequency band territory in the received signal of AMPb output.MIXb carries out mixing to frequency signal and the received signal exported from SYN, and output intermediate-freuqncy signal IF.
Use dielectric duplexer shown in Figure 17 as aforementioned DPX.In addition, use Fig. 1, the dielectric filter of Figure 13-shown in Figure 16 is as BPFa, BPFb.
Adopt the present invention, even then the configuration space of the configuration direction in inner wire formation hole is extremely narrow, also can expand the interval that inner wire forms the hole, the inner wire of mitigation adjacency forms the current concentration between the hole, improves Qodd.Its result can reduce the insertion loss of passing through the band territory through regulation.
In addition, adopt the present invention, then the section that forms the hole by means of described inner wire be to form the upwardly extending elliptical shape in vertical side of the configuration direction in hole with described inner wire, can improve based on the coupling between the resonator in the inner wire formation hole of adjacency, easily work for wide bandization.
In addition, adopt the present invention,, can easily constitute the communicator of integral miniaturization then by means of dielectric filter with small-sized and low insertion loss.
Claims (3)
1. dielectric filter comprises:
The medium block of rectangular shape,
Inside, its inner wire that roughly forms inner wire in parallel to each other on inner face of being arranged on the medium block of described rectangular shape form the hole, and
The outer conductor that on the outside of described medium block, forms,
It is characterized in that,
Described inner wire begins to be formed into and described the 1st relative the 2nd from the 1st of described medium block,
When form the configuration space of hole on described the 1st length direction with described inner wire is spacing and when being thickness with the width vertical with described the 1st length direction, the ratio of spacing and thickness is less than 0.6, the axle that makes the inner wire of adjacency form hole at least a portion simultaneously departs from and is positioned at the described thickness direction centre center line parallel with described length direction, so as on described thickness direction reciprocally away from.
2. dielectric filter as claimed in claim 1 is characterized in that,
Described inner wire forms the elliptical shape of section for extending of hole at least a portion on described thickness direction.
3. a communicator is characterized in that, comprises
Dielectric filter as claimed in claim 1 or 2.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000243303A JP2002057510A (en) | 2000-08-10 | 2000-08-10 | Dielectric filter and communication equipment |
| JP243303/2000 | 2000-08-10 | ||
| JP243303/00 | 2000-08-10 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1338791A CN1338791A (en) | 2002-03-06 |
| CN1187863C true CN1187863C (en) | 2005-02-02 |
Family
ID=18734177
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB011249781A Expired - Lifetime CN1187863C (en) | 2000-08-10 | 2001-08-10 | Dielectric filter and communication apparatus |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JP2002057510A (en) |
| KR (1) | KR100401960B1 (en) |
| CN (1) | CN1187863C (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3788369B2 (en) * | 2001-04-10 | 2006-06-21 | 株式会社村田製作所 | Dielectric filter, dielectric duplexer, and communication device |
| JP6839692B2 (en) * | 2018-10-19 | 2021-03-10 | 双信電機株式会社 | filter |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63283201A (en) * | 1987-05-14 | 1988-11-21 | Murata Mfg Co Ltd | Integrally molded type high frequency filter |
| JP3067575B2 (en) * | 1995-03-08 | 2000-07-17 | 株式会社村田製作所 | Dielectric filter |
-
2000
- 2000-08-10 JP JP2000243303A patent/JP2002057510A/en active Pending
-
2001
- 2001-08-07 KR KR10-2001-0047392A patent/KR100401960B1/en active IP Right Grant
- 2001-08-10 CN CNB011249781A patent/CN1187863C/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| KR20020013415A (en) | 2002-02-20 |
| KR100401960B1 (en) | 2003-10-17 |
| JP2002057510A (en) | 2002-02-22 |
| CN1338791A (en) | 2002-03-06 |
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Granted publication date: 20050202 |