CN1167346A - Medium wave filter - Google Patents
Medium wave filter Download PDFInfo
- Publication number
- CN1167346A CN1167346A CN97104277A CN97104277A CN1167346A CN 1167346 A CN1167346 A CN 1167346A CN 97104277 A CN97104277 A CN 97104277A CN 97104277 A CN97104277 A CN 97104277A CN 1167346 A CN1167346 A CN 1167346A
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- mentioned
- short circuit
- frequency
- dielectric filter
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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
-
- 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
-
- 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
- H01P1/2135—Frequency-selective devices, e.g. filters combining or separating two or more different frequencies using strip line filters
-
- 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
The two parallel bottomed holes of rectangular parallelopipeds are formed along a back and forth direction at the front surface 1-a of a dielectric block 1, and inner conductors 10-1 and 10-2 are respectively formed at the inner surface of these bottomed holes. An outer conductor 6 is formed at each faces except the front surface 1-a among the outer surfaces of the block 1, and short circuit part connecting conductors 11-1 and 11-2 are formed so as to be extended in an outer and horizontal direction from one tip of the inner conductors 10-1 and 10-2 so as not to be combined with each other. The frequency f[t1], f[t2] of an attenuating pole 5 and 4 is changed without varying a passing frequency f[0] by optionally combining the length of the short circuit part connecting conductors 11-1 and 11-2(namely the size of Z[1]) and the length(namely the size of Z[2]) of the resonance cables 13-1 and 13-2.
Description
The present invention relates to the dielectric filter of 1/4 wave resonance circuit.
Fig. 9 is the oblique view of the existing dielectric filter structure of expression, and Figure 10 is its drawing in side sectional elevation, and Figure 11 is its equivalent circuit diagram, and Figure 12 is the key diagram of its Electric Field Distribution of expression and Distribution of Magnetic Field, and Figure 13 is the key diagram of its frequency characteristic of expression.As Fig. 9 and shown in Figure 10, on the medium block 1 of rectangular shape roughly, form its front openings and, have the inner face of bottom outlet forming inner wire 2-1,2-2 respectively at this facing to the bottom outlet that has of two parallel cuboids of the face at rear.Thereby as shown in figure 10, the horizontal profile of medium block 1 is formed the E word shape.And, form outer conductor 6 at the outer peripheral face of medium block 1, and then, all short-circuit conductors 5 that makes inner wire 2-1,2-2 and outer conductor 6 short circuits that forming in the front of medium block 1.Be provided with respectively in the two sides of medium block 1 to connecting input and output electrode 4-1, the 4-2 of inner wire 2-1,2-2, forming the hole simultaneously and the inner face in this hole is forming bonding conductor 3-1,3-2.Also have, as other prior art example, well-known is to adopt electric capacity to connect to replace directly connecting inner wire 2-1,2-2 and input and output electrode 4-1,4-2.Make such medium block 1 with the dielectric material that methods such as pressure processing or injection molding forming are used microwave, conductive paste is formed conductor or electrode with methods such as burn-back or electroless platings.
The end of 2 inner wire 2-1,2-2 of this medium block 1 is by outer conductor 6 short circuits, the other end is by the capacity cell terminal, constitute the antiresonant circuit of 1/4 wave length type thus, its equivalent electric circuit can be represented by resonance circuit 8-1,8-2 and Terminal Capacitance 7-1,7-2 as illustrated in fig. 11.Here, resonance circuit 8-1,8-2 are equivalent to inner wire 2-1,2-2 respectively, and Terminal Capacitance 7-1,7-2 are respectively the electric capacity that forms between the opening of inner wire 2-1,2-2 distolateral (bottom surface in hole) and outer conductor 6.
Figure 12 (a) expression resonance frequency f
oThe magnetic field, the distribution curve of electric field at place, Figure 12 (b) is representing the attenuation pole frequency f 4. as shown in figure 13
tMagnetic field, the distribution curve of electric field.In Figure 12 (a) and (b), symbol 7 expression Terminal Capacitance, symbol 8 expression resonance circuits, transverse axis is represented the intensity in electric field, magnetic field, the longitudinal axis is represented the position of circuit 8.And magnetic field profile can be in order to the cosine wave curve representation of short-circuit end 8a as initial point, and the Electric Field Distribution curve can be represented as the sine wave curve of initial point in order to short-circuit end 8a.
At this moment, the area separately of a of oblique line portion, b is represented magnetic field intensity, the electric field strength of resonance circuit 8 respectively.And some C is at the resonance frequency f that also comprises the part that shortens with Terminal Capacitance 7
oPhase place become 90 the degree positions.That is, Figure 12 (a) is representing the distance of short-circuit end 8a and some C is made as the resonance frequency f of λ/4
oElectromagnetic field distribute.Just can understand from figure, at resonance frequency f
o, the area of a of oblique line portion is greater than the area of the b of oblique line portion.This is representing to play dominating role a side of resonance circuit 8 internal magnetic fields coupling.
In contrast, shown in Figure 12 (b), in the equal magnetic field profile of the area (electric field strength) of the area that can describe a of oblique line portion (magnetic field intensity) and the b of oblique line portion, the frequency of Electric Field Distribution curve, loss becomes infinity (attenuation pole).Just knowing from Figure 12 (b), is the frequency f of λ/4 in the distance of establishing short-circuit end 8a and the some d suitable with the length of resonance circuit 8
t, the area of a of oblique line portion, b equates.And this d is positioned at than at fundamental frequency f
oShort position, 90 degree positions.That is, there is attenuation pole frequency f 4. in the upside in passband
t
Figure 13 represents band pass filter (BPF) characteristic of above-mentioned prior art example, and transverse axis is that (0～6GHz), the longitudinal axis is attenuation ATT (80～0dB) to frequency.1., 2., 3. represent fundamental frequency f among the figure respectively
0Second harmonic 2f
oWith triple-frequency harmonics 3f
o, and 4. be above-mentioned attenuation pole, f
o＜f
t＜2f
o＜3f
oBut, in medium band pass filter BPF, have at fundamental frequency f by 1/4 wave resonator of such characteristic
oThe frequency of 3 times, 5 times odd-multiple produce false resonance and become passband, with 2f
o, 3f
o(Figure 13 is respectively 2f to the inadequate problem of the corresponding decay of frequency
o:-17dB, 3f
o:-8dB).Thereby, in fact for example be necessary prevention 2f
o, 3f
oLow pass filter (LPF) frequently uses in combination.
And along with the high frequencyization of nearest wireless communication system, the occasion that the frequency of oscillation of local oscillator and image (image) frequency ratio communication frequency is low is more, in order to get rid of these situations, urgently wishes than communication frequency f
oLow frequency has the dielectric filter of attenuation pole.But, routine because fundamental frequency f in above-mentioned prior art
oDownside do not have attenuation pole, so can not realize this hope.Thereby, just other trap circuit must be arranged for getting rid of local oscillation frequency and picture frequency.
The objective of the invention is in view of above-mentioned existing problem, the frequency of the upside that can realize positively stoping fundamental frequency and downside is provided and makes the dielectric filter of the bandpass characteristics that fundamental frequency passes through.
The present invention is in the inside of medium frame, resonance circuit by mutual electromagnetic coupling and the terminal shortcircuit that makes outer conductor and these resonance circuits like that and mutually not the short circuit portion connection line of electromagnetic coupled ground or the formation of weak coupling ground constitute 1/4 wave resonance circuit.As constituting in this wise, be that the length of impedance and short circuit portion connection line is impedance by the length of setting resonance circuit suitably, can produce attenuation pole at logical downside and upside frequently, and can produce desirable attenuation.
At dielectric filter of the present invention, the inside that forms the medium block of outer conductor outside have 1/4 wave resonance circuit of a plurality of mutual electromagnetic coupling, each of above-mentioned 1/4 wave resonance circuit all have the inner formed inner wire of above-mentioned medium block and the terminal shortcircuit that makes above-mentioned outer conductor and this inner wire like that and mutually not electromagnetic coupled or a little less than close at the formed short circuit of the end face portion bonding conductor of above-mentioned medium block.Because such structure, can realize positively stoping the frequency of the upside of fundamental frequency and downside and bandpass characteristics that fundamental frequency is passed through.
And, one side's end face opening is arranged and form a plurality of parallel medium blocks that the end arranged, a plurality of inner wires that form at the above-mentioned inner face that bottom outlet arranged, the outer conductor that forms in other outside except an above-mentioned square end face of above-mentioned medium block, make above-mentioned outer conductor connect like that and the not a plurality of short circuit portion bonding conductor that forms of electromagnetic coupled or weak coupling ground of above-mentioned each inner wire at the above-mentioned side's of above-mentioned medium block end face towards the opposing party's end face at dielectric filter of the present invention.Because such structure, can realize positively stoping the frequency of the upside of fundamental frequency or downside and bandpass characteristics that fundamental frequency is passed through.
And, a plurality of short circuit portion bonding conductor being prolonged in the other direction from the short-circuit end of above-mentioned inner wire mutually at an above-mentioned side's of above-mentioned medium block end face form like that, or between a plurality of short circuit portion bonding conductor, form the electromagnetic shielding member, this is resultful.
Fig. 1 is the oblique view that expression relates to the dielectric filter of the present invention the 1st embodiment.
Fig. 2 is the drawing in side sectional elevation of the dielectric filter of presentation graphs 1.
Fig. 3 is the equivalent circuit diagram of the dielectric filter of Fig. 1.
Fig. 4 is the key diagram of an example of the Electric Field Distribution of dielectric filter of presentation graphs 1 and Distribution of Magnetic Field.
Fig. 5 is the key diagram of frequency characteristic one example of the dielectric filter of presentation graphs 1.
Fig. 6 is the oblique view of the related dielectric filter of expression the present invention the 2nd embodiment.
Fig. 7 is the oblique view of the related dielectric filter of expression the present invention the 3rd embodiment.
Fig. 8 is the oblique view of the related dielectric filter of expression the present invention the 4th embodiment.
Fig. 9 is the oblique view of the dielectric filter structure of expression prior art.
Figure 10 is the drawing in side sectional elevation of the dielectric filter of presentation graphs 9.
Figure 11 is the equivalent circuit diagram of the dielectric filter of Fig. 9.
Figure 12 is the Electric Field Distribution of dielectric filter of presentation graphs 9 and the key diagram of Distribution of Magnetic Field.
Figure 13 is the key diagram of frequency characteristic of the dielectric filter of presentation graphs 9.
As depicted in figs. 1 and 2, form the short circuit bonding conductor 11-1 of portion, 11-2 (microwave transmission line) at the front 1-a of the related medium block 1 of present embodiment, this point and front at medium block 1 all form short circuit inner wire 2-1,2-2 and outer conductor 6 and the prior art example of the short-circuit conductor 5 of usefulness is different.As explain, be formed on the front 1-a opening of the medium block 1 of cuboid roughly and bottom outlet arranged along fore-and-aft direction facing to two parallel cuboids of the face at rear, forming inner wire 10-1,10-2 respectively at the bottom outlet inner face that has of these two parallel cuboids.Thereby as shown in Figure 2, the horizontal profile of medium block 1 forms the roughly font of E.
Upper and lower, left and right in the outside of medium block 1 except the 1-a of front, after each face form outer conductor 6, thereby, in inner wire 10-1,10-2, be equivalent to the zone (open end) at the end and relatively to the outer conductor 6 of outside of back between form electrostatic capacitance.And then, be provided with respectively to connecting input and output electrode 4-1, the 4-2 of inner wire 10-1,10-2 in the two sides of medium block 1, form the hole simultaneously, and the inner face in this hole is forming bonding conductor 3-1,3-2.
And, the bonding conductor 11-1 of short circuit portion, 11-2 are by electromagnetic coupled or weak coupling are not forming like that mutually, at the front of medium block 1 1-a the bonding conductor 11-1 of short circuit portion is being formed like that from the opening of inner wire 10-1 along the left side extension, and the bonding conductor 11-2 of short circuit portion is being formed along the right side extension like that from the opening of inner wire 10-2.The manufacture method of the bonding conductor 11-1 of this short circuit portion, 11-2 be in front 1-a form recess and in front whole of 1-a form conductor, available grinding forms, and also can make formation front 1-a such as figure and replace forming recess.Also have, hatching is as shown in Figure 1 representing not form the part of conductor.
As shown in Figure 3, the equivalent electric circuit of this dielectric filter is the 1/4 wave resonance circuit that the connection line 15-1 of short circuit portion, 15-2 and resonance circuit 13-1,13-2 and Terminal Capacitance 12-1,12-2 are arranged, and the connection line 15-1 of short circuit portion, 15-2 and resonance circuit 13-1,13-2 are equivalent to the bonding conductor 11-1 of short circuit portion, 11-2 and inner wire 10-1,10-2 shown in Figure 2 respectively.And, each line impedance Z of the connection line 15-1 of short circuit portion, 15-2
1Be set than each line impedance Z of resonance circuit 13-1,13-2
2(Z greatly
1＞＞Z
2), make resonance circuit 13-1,13-2 carry out electromagnetic coupled and move as BPF.
With reference to Fig. 4 and Fig. 5 this action is described, the longitudinal axis shown in Figure 4, transverse axis are identical with above-mentioned Figure 12, Fig. 4 (a) expression resonance frequency f
oDistribution curve, Fig. 4 (b) is illustrated in the 5. frequency f of (with reference to Fig. 5) of the 1st attenuation pole
T1Distribution curve, Fig. 4 (c) is illustrated in the 2nd attenuation pole frequency f 4.
T2Distribution curve.And, the symbol 12 expression Terminal Capacitance among the figure, symbol 13 expression resonance circuits, symbol 15 expression short circuit portion connection lines.
The structure of the dielectric filter that present embodiment is related similarly is 1/4 wave resonance circuit with the prior art example also, so, magnetic field profile can be the cosine wave curve representation of initial point in order to short-circuit end 15a, and the Electric Field Distribution curve can be that the sine wave curve of initial point is represented in order to short-circuit end 15a.C ' among figure point is also to comprise circuit 13 and 15 and shorten resonance frequency f partly with Terminal Capacitance 12
oPhase place become 90 the degree positions.That is, as representing short-circuit end 15a and putting the fundamental frequency f of the distance of C ' as λ/4
oElectromagnetic field distribute, then just become shown in Fig. 4 (a) like that.But, in the occasion of said structure circuit 13 and 15 are arranged, but because that be coupled only is resonance circuit 13 (illustrated coupling part 13a, non-coupling part 15b), so magnetic field in resonance circuit 13 and electric field strength become the intensity in the resonance circuit 13 of each curve.Also have, the intensity in the cartographic represenation of area magnetic field of the figure bend a of portion, the cartographic represenation of area electric field strength of the b of oblique line portion, Fig. 4 (a) is as the occasion of an example expression magnetic field coupling＜field coupled.
Here and above-mentioned prior art example in the same manner, become equal frequency at the area (electric field strength) of the area (magnetic field intensity) of a of oblique line portion and the b of oblique line portion and produce attenuation pole.Fig. 4 (b) is illustrated in both and becomes the some e that near an equal frequency generation phase place C ' becomes 90 degree.Put e in this embodiment and be positioned at the position longer, attenuation pole frequency f 5. than C '
T1Be positioned at passband f
oDownside.The frequency f of this attenuation pole
T1Main position by non-coupling part 15b, i.e. length (the Z of the connection line 15-1 of short circuit portion, 15-2
1Size) decision, shorten as the connection line 15-1 of short circuit portion, 15-2, then identical with the prior art example, make attenuation pole frequency f 5.
T1To passband f
oLast side shifting.
The frequency that the area of Fig. 4 (c) expression oblique line a of portion and the area of the b of oblique line portion equate is also at 2f
oNear, this phase place become 90 the degree positions at a f.This f since be positioned at a C ' 1/2 near, so attenuation pole frequency f 4.
T2At 2f
oNear generation, this frequency f
T2Main position, the i.e. length (Z of resonance circuit 13-1,13-2 by coupling part 13a
2Size) decision.Thereby above-mentioned structure is not coupled connection line 15-1 of short circuit portion and 15-2 as condition.
Then, with reference to Fig. 6 the 2nd embodiment is described.In this embodiment, for short circuit connection line 15-1 and 15-2 are shortened, so the length of the bonding conductor 17-1 of short circuit portion, 17-2 is shorter than the bonding conductor 11-1 of short circuit portion, the 11-2 of the 1st embodiment, thereby, two ends, the left and right sides grooving of front 1-6 is formed outer conductor 6-1,6-2.
In the 3rd embodiment shown in Figure 7, for the degree of coupling that makes connection line 15-1 of short circuit portion and 15-2 diminishes, the bonding conductor 19-1 of short circuit portion from the opening of inner wire 18-1 along the below to formation, the bonding conductor 19-2 of short circuit portion from the opening of inner wire 18-2 along the top to formation.
In the 4th embodiment shown in Figure 8, the bonding conductor 21-1 of short circuit portion, 21-2 form along following direction from the opening of inner wire 20-1,20-2 respectively jointly abreast, but for the degree of coupling that makes short circuit bonding conductor 21-1 and 21-2 diminishes, (previous section 6-3) forms outer conductor 6 round between bonding conductor 21-1 of short circuit portion and 21-2, and, between this previous section 6-3 and the bonding conductor 21-1 of short circuit portion, 21-2, do not form outer conductor 6 and (illustrate 1-d, 1-e).
According to such structure, the length by the connection line 15-1 of combination in any short circuit portion, 15-2 etc. (is Z
1Size) and the length of resonance circuit 13-1,13-2 etc. (be Z
2Size), do not change logical f frequently
oAnd can change attenuation pole 5., frequency f 4.
T1, f
T2Thereby, for example, as shown in Figure 5, can be as f
T1＜f
o＜2f
o＜f
T2＜3f
oConstitute attenuation pole frequency f 4. like that
2Be positioned at 2f
oAnd 3f
oBetween BPF, in example shown in Figure 5, at 2f
oThe attenuation of energy realization-30dB is at 3f
oThe attenuation of energy realization-28dB.And, at f
oDownside owing to can produce attenuation pole 5., so than local oscillation frequency and picture frequency f
oLow occasion also can disconnect local oscillation frequency and picture frequency.
As described above like that according to the present invention, by the length of suitably setting resonance circuit is that the length of impedance and short circuit portion connection line is impedance, just can produce attenuation pole at the downside of logical frequency and the both sides of upside, and can produce desirable attenuation, so can realize stoping really the frequency of the upside of fundamental frequency and downside and bandpass characteristics that fundamental frequency is passed through.
Claims (6)
1. dielectric filter, it is characterized in that, there are a plurality of 1/4 wave resonance circuit of mutual electromagnetic coupling the inside that forms the medium block of outer conductor outside, and above-mentioned each 1/4 wave resonance circuit has at the formed inner wire in the inside of above-mentioned medium block and makes an end of this inner wire and like that and mutual electromagnetism ground or the weak coupling ground formed short circuit of the end face portion bonding conductor at above-mentioned dielectric members that is not coupled of above-mentioned outer conductor short circuit.
2. dielectric filter as claimed in claim 1 is characterized in that, forms the electromagnetic shielding member between above-mentioned a plurality of short circuit portion bonding conductor.
3. dielectric filter, it is characterized in that, a plurality of inner wires that have end face opening on one side and a plurality of parallel medium block that bottom outlet arranged that forms facing to the another side end face, form at the above-mentioned inner face that bottom outlet arranged, other the formed outer conductor in outside except above-mentioned one side end face of above-mentioned medium block with end face above-mentioned outer conductor is connected like that with above-mentioned each inner wire on above-mentioned one side of above-mentioned medium block and mutually not electromagnetic coupled or weak coupling a plurality of short circuit bonding conductors of formation.
4. dielectric filter as claimed in claim 3 is characterized in that, above-mentioned a plurality of short circuit bonding conductors are mutual to prolonging in the other direction and forming from the short-circuit end of above-mentioned inner wire at the end face on above-mentioned one side of above-mentioned medium block.
5. dielectric filter as claimed in claim 4 is characterized in that, is forming the electromagnetic shielding member between above-mentioned a plurality of short circuit portion bonding conductor.
6. dielectric filter as claimed in claim 3 is characterized in that, is forming the electromagnetic shielding member between above-mentioned a plurality of short circuit portion bonding conductor.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP120252/96 | 1996-05-15 | ||
| JP12025296A JP3461420B2 (en) | 1996-05-15 | 1996-05-15 | Dielectric filter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1167346A true CN1167346A (en) | 1997-12-10 |
| CN1096718C CN1096718C (en) | 2002-12-18 |
Family
ID=14781602
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN97104277A Expired - Fee Related CN1096718C (en) | 1996-05-15 | 1997-05-15 | Medium wave filter |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JP3461420B2 (en) |
| KR (1) | KR100267457B1 (en) |
| CN (1) | CN1096718C (en) |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5162760A (en) * | 1991-12-19 | 1992-11-10 | Motorola, Inc. | Dielectric block filter with isolated input/output contacts |
| JP3160150B2 (en) * | 1994-05-16 | 2001-04-23 | アルプス電気株式会社 | Dielectric filter |
| FI98870C (en) * | 1994-05-26 | 1997-08-25 | Lk Products Oy | Dielectric filter |
| JP3160157B2 (en) * | 1994-07-21 | 2001-04-23 | アルプス電気株式会社 | Dielectric filter |
| EP0704924B1 (en) * | 1994-09-27 | 2000-01-26 | Murata Manufacturing Co. Ltd. | Dielectric filter |
-
1996
- 1996-05-15 JP JP12025296A patent/JP3461420B2/en not_active Expired - Fee Related
-
1997
- 1997-05-13 KR KR1019970018370A patent/KR100267457B1/en not_active IP Right Cessation
- 1997-05-15 CN CN97104277A patent/CN1096718C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH09307308A (en) | 1997-11-28 |
| CN1096718C (en) | 2002-12-18 |
| JP3461420B2 (en) | 2003-10-27 |
| KR100267457B1 (en) | 2000-10-16 |
| KR970077810A (en) | 1997-12-12 |
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