CN1082773A - Multi-passband dielectric filter construction - Google Patents
Multi-passband dielectric filter construction Download PDFInfo
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Abstract
A kind of filter duplexer of minimum dimension for example is used for the filter duplexer of radio set.Wherein first filter segment comprises the resonator of at least one first geometry, second filter circuit partly comprises the resonator of second geometry, their geometry is different, and the relative nature admittance together with the device that shakes of each filter circuit part is different.Because the resonator of two filter circuits part has different electrical characteristics, the frequency response of the diplexer filter that just can obtain wishing with identical resonator load capacity.
Description
The present invention is that the application serial of submitting in the U.S. on January 21st, 1992 is No.07/823,227 patent application and be " structure of multi-passband dielectric filter " by the title that Zduavko M.Zakman proposes according to the professional express mail label of United States Post Office No.FB390893798U, the application number of proposition was No. on April 30th, 1992
Continuation partly apply for.
Relate generally to delectric filter of the present invention particularly relates to multi-passband dielectric filter, and for example its physical size design is limited to a minimum diplexer filter.
The progress in radioelectronics field has allowed the employing and the commercialization of ever-increasing a series of radio communication equipments.The progress of design of electronic circuits also allows to improve the miniaturization of the electronic circuit that constitutes this wireless device.Therefore, the ever-increasing a series of radio communication equipments that are made of the electronic circuit that constantly diminishes allow to utilize more easily radio communication equipment when increasing the quantity of using.
A kind of radio set, the radio telephone that for example uses in cellular communication systems is an example of radio communication equipment, it is miniaturized, and is convenient to use when application numbers increases.Now just for further to make the miniaturization of the electronic circuit of this radio set and other radio communication equipment carry out more effort.The further miniaturization of this radio set will further increase the convenience of utilizing this equipment, and will allow this equipment to utilize when the application numbers that further increases.
According to the electronic circuit of the further miniaturization formation radio set of this effort and other radio communication equipment, the compact in size that constitutes the electronic circuit of this equipment is a design object crucial in circuit design.
Dielectric block (dielectric block) filter comprises ceramic material, usually constitutes the part of this radio transceiver circuitry.The reason of advantageously utilizing this dielectric block filter be it have cost low, make simple, on electronic circuit board, install and be easy to advantage, and this transceiver usually on the frequency of work (typically in 900 megahertzes and 1.7 gigahertz scopes) have good filtering characteristic.
In order to constitute the dielectric material blocking filter, beat some holes, or in other words form these holes and pass dielectric block and extend, and, for example contain ag material and apply determining the sidewall conducting material in this hole.Therefore, the hole of formation has constituted resonator, and this resonator resonance is in the frequency of being determined by the length in hole.
Typically, the major part of the outer surface of dielectric block applies with electric conducting material similarly.These parts of outer surface typically are coupled to electrically.
The apart part of the upper surface of dielectric block typically also applies with electric conducting material, and it is an electric insulation with the electric conducting material that applies on other outer surface of dielectric block.The adjacent part of the electric conducting material that applies at upper surface becomes and capacitively is coupled.In addition, such partition capacitance ground loads each resonator.
The capacitive load of each resonator (because the electromagnetism mutual coupling between the adjacent resonator), this piece upper surface portion (because capacitive coupling), resonator together, limit a filter, this filter has the filtering characteristic that the signal that is added on it is carried out filtering.
The precision wave filtering characteristic of this filter can be controlled by the interval between the adjacent resonators of the mutual coupling of control capacitance (thereby its constitutes capacitance of capacity cell) resonator (thereby inductance value of its inductance element of constituting).
In history, constituting the component value of this filter part is controlled by two kinds of methods with the filtering characteristic that therefore constitutes this filter.The first, the capacitance and the second of the capacity cell that change forms on the dielectric block upper surface, the interval between the adjacent resonators of change resonator.
The filtering characteristic that change constitutes capacity cell on the dielectric block upper surface capacitance changes delectric filter is becoming little feasible means, because the actual size of this filter is reduced.The capacitance of this capacity cell depends on the actual size of the coated area that constitutes this element and constitutes interval between this capacity cell coated area.
Because the physical size of this filter is reduced, the actual size that constitutes the coated area of capacity cell must correspondingly reduce.In order to make such capacity cell keep identical capacity (because capacity is proportional to surface area, is inversely proportional to its distance), the interval between the coated area must reduce.
Yet, owing on making, there is certain restriction the minimum interval between the coated area.The change of the filtering characteristic of the filter of therefore, making by this way is more and more restricted.
Diplexer filter is a kind of like this delectric filter that is generally used for constituting the radio set partial circuit.Typically, diplexer filter is connected between the Antenna+Transmitter circuit and receiver circuit two parts of radio set.This diplexer filter comprises the receiving unit of one first passband, and the center of first passband is about first centre frequency; With the emission filter part with second passband, the second passband center is about second centre frequency.Second passband of first passband of the receiving filter of diplexer filter part and emission filter part is the passband of overlapping frequency not.Receiving filter part and these two parts of emission filter part are connected to a community antenna; Receiving filter partly is coupled to the receiving circuit of radio set, and its emission filter partly is connected to the transmitter circuitry part of this radio set.
Corresponding to the miniaturization that improves radio set, the restriction that reduces to be subjected to above-mentioned constraint of the physical size of diplexer filter.
Therefore, need a kind of comb filter structure and make the means of this structure, so that reduce actual size.
Therefore, the present invention has overcome the restriction of prior art, and the actual size of diplexer filter structure is reduced.
A further advantage of the invention is provides a kind of diplexer filter of actual size minimum structure.
The present invention includes further advantage and feature, its details will become more obvious by the detailed description of reading following most preferred embodiment.
Therefore, according to the present invention, a kind of comb filter structure of having determined the dielectric block formation of upper surface, lower surface and at least the first and second sides is disclosed.This filter construction comprises first a filter circuit part that produces first filtering signal that applies that is used for according to first input signal.This first filter circuit part is formed with two resonators at least, and the longitudinal axis along it longitudinally extends basically between the upper surface of dielectric block and lower surface.The sectional area of first at least two resonators of this first filter circuit part is first kind of shape, and second sectional area at least two resonators is second kind of shape.The geometry of the sectional area of the sectional area of this second shape and first shape is inequality.Second filter circuit part produces one second filtering signal according to applying of second input signal.This second filter circuit part is formed with a resonator at least, and it longitudinally extends basically along its longitudinal axis between the upper and lower surface of dielectric block.
When reading with reference to the accompanying drawings, will be better understood the present invention, wherein:
Fig. 1 is the diagrammatic representation of the diplexer filter frequency response of the preferred embodiment of the present invention;
Fig. 2 is the electric sketch of the diplexer filter of the preferred embodiment of the present invention;
Fig. 3 is the perspective view that the present invention preferably implements full diplexer filter, the filter shown in the electrical schematic diagram of Fig. 2;
Fig. 4 is the bottom view of seeing from Fig. 3 filter downside;
Fig. 5 is the plane graph of another diplexer filter of the preferred embodiment of the present invention;
Fig. 6 is the plane graph of the another diplexer filter of the preferred embodiment of the present invention;
Fig. 7 is the plane graph of another diplexer filter of the preferred embodiment of the present invention;
Fig. 8 is the plane graph of another diplexer filter of the preferred embodiment of the present invention;
Fig. 9 is the plane graph of another diplexer filter of the preferred embodiment of the present invention;
Figure 10 is the plane graph of another diplexer filter of the preferred embodiment of the present invention;
Figure 11 is the block diagram of the radio set of the preferred embodiment of the present invention, wherein the preferred embodiment of the present invention diplexer filter, for example diplexer filter of one of an earlier drawings formation one part; With
Figure 12 is the logical flow chart of the method step enumerated of preferred embodiment of the present invention method.
At first referring to the diagrammatic representation of Fig. 1, with diagrammatic representation the frequency response of diplexer filter.Axis of ordinates 10 is the unit scale with relative power value decibel, and axis of abscissas 14 is the unit scale with the frequency.Curve 18 is frequency response charts of first filter segment of diplexer filter (between a public port and diplexer filter first input end).Curve 20 is frequency response charts of second filter segment of diplexer filter (between second input port of this public port and diplexer filter).The frequency response of first filter segment determines that the frequency response of passband 22, the second filter segments determines passband 26. Passband 22 and 26 is not overlapping band connection frequencies, separated opening on frequency.
As previously mentioned, diplexer filter is advantageously used in and constitutes duplex wireless electricity transceiver part, and replaces being connected respectively to the receiver circuit of transceiver and the single reception and the transmitting filter that separate of transmitter circuitry part.A diplexer filter of being made up of the dielectric material of a monolithic present higher efficient (being the low-loss device), and comparable independent filter is produced more cheaply.
Reduce greatly owing to typically constitute the physical size of the electronic device of duplexer, correspondingly, the physical size of this duplexer is also reducing.The physical size that reduces diplexer filter can various mode be realized.For example, can change the dielectric material that constitutes duplexer.But, replace that different dielectric materials is subjected to availability with the way of the relative dielectric constant that increases this material and the restriction of the cost that constitutes with the material with good electric and mechanical property, therefore, the physical size that reduces filter with this way usually is unpractical means.
Coat the capacitive load that the capacity cell of capacitor plate constitutes and to increase by being included in the diplexer filter surface, therefore, allow to shorten resonator.Yet, because on making, the interval between the capacity cell pole plate reduces to surpass minimum range.Such minimum interval requires to have limited the dwindling of physical size of diplexer filter.
Therefore, the capacitance by changing the capacity cell on filter, constitute or by using other dielectric materials to constitute diplexer filters, additionally the reducing of the actual size of monolithic duplexer filter is restricted.
Referring to the electronics sketch of Fig. 2, the figure shows the circuit diagram of a diplexer filter, this filter is unified here represents with label 80.Filter 80 has been represented the structure of a multipole some diplexer filter, has the frequency response of passband on the radio set transmission that this filter configuration becomes to work in cellular communication system and the frequency of reception modulation signal.
Should be noted that filter 80 is representatives of exemplary embodiment of the present in beginning; Instruction according to the preferred embodiment of the invention can be configured to much other duplexer and other first order pole and multipole some filter circuit of other circuit arrangement.
The filter 80 of Fig. 2 comprises a plurality of resonators by transmission line 104,108,112,116,120,124,128,132 and 146 representatives.Resonator by transmission line 104-136 representative is electrically loaded to the plane capacitive by 140,144,148,152,156,160,164,168 and 172 pairs in capacitor.
Adjacent resonator (104-136 represents by transmission line) is coupled by perception ground and capacitive ground and adjacent resonator.First filter segment of filter 80 is included in the resonator that filter 80 left-hand sides are represented, and second filter segment of filter 80 comprises the resonator that this figure right-hand side partly constitutes.The input of first filter segment is represented with line 176 in the drawings.Similarly, the input of second filter segment is represented with line 184 in the drawings.First filter segment and second filter segment jointly are connected to individual antenna by the terminal of line 192 indications.
Single resonator (104-136 represents with transmission line) is coupled to its resonator of vicinity perceptually.In the drawings, the induction coupling between the resonator of transmission line 104 and 108 expressions is represented with transmission line 202; Similarly, the induction coupling between the resonator of transmission line 108 and 122 expressions is represented with transmission line 206; Induction coupling between the resonator of transmission line 112 and 116 expressions is represented with transmission line 210; Induction coupling between the resonator of transmission line 116 and 120 expressions is represented with transmission line 214; Induction coupling between the resonator of transmission line 120 and 124 expressions is represented with transmission line 218; Induction coupling between the resonator of transmission line 124 and 128 expressions is represented with transmission line 222; Induction coupling between the resonator of transmission line 128 and 132 expressions is represented with transmission line 226; And the induction coupling between the resonator of transmission line 132 and 136 expressions is represented with transmission line 230.
Be coated on the inner surface (or forming and electrically be connected to such inner surface on the dielectric block surface) of inner wire of the resonator of determining filter 80 electric conducting material by capacitive be coupled to the corresponding part of adjacent resonator.In the figure, such capacitive coupling is represented with capacitor 234,238,242,246 and 250.In addition, capacitor 254 and 258 expression input capacitances; Similarly, capacitor 262 and 266 expression input capacitances; Capacitor 270 and 274 is represented the coupling capacitance to antenna port.
As mentioned above, owing to require the minimum interval between the conducting element of this capacitor, increase the load of resonance container and be restricted with the actual size that allows further to reduce the dielectric block diplexer filter.Such capacitive load is represented with capacitor 140-172 in the drawings.
Routinely, the size of the resonator of the filter of representing with transmission line 104-136 among the figure all is similar.When the limit resonator was similar size, the characteristic admittance of each resonator all was similar value.Therefore, by node analysis, can obtain a node admittance equation.For example, for the node that separates, be capacitor 164,246 and 250 and the common ground of transmission line 128,222 and 226 at this node, can obtain the following admittance equation of node:
jω
0（C
164+C
246+C
250）-j（Y
128+Y
222+Y
226）cotθ
0＝0
Wherein: C
164It is the capacitance of capacitor 164;
C
246It is the capacitance of capacitor 246;
C
250It is the capacitance of capacitor 250;
Y
128It is the even mould admittance of transmission line 128;
Y
222It is the characteristic admittance of transmission line 222;
Y
226It is the characteristic admittance of transmission line 226;
ω
0It is angular frequency at the filter passband center;
θ
0Be at ω
0The electrical length of following transmission line.
More generally, for the resonator i of any three adjacent extreme points of filter 80, j and k can obtain following node admittance equation:
jω
0（C
j+C
ij+C
jk）-j（Y
j+Y
ij+Y
jk）cotθ
0＝0
Wherein:
Y
jIt is the even module feature admittance of resonator j;
C
jIt is the capacitance between resonator j and the ground;
Y
IjIt is the mutual characteristic admittance between resonator i and the j;
C
IjIt is the coupling capacitance between resonator i and the j;
Y
JkIt is the value of mutual characteristic admittance between resonator j and the k;
C
JkIt is the coupling capacitance between resonator j and the k;
ω
0Be at the passband center of filter angular frequency; With
θ
0Be at ω
0The electrical length of place's transmission line.
This general expression can be rewritten as follows:
C
j+C
ij+C
jk＝（Y
j+Y
ij+Y
jk）cotθ
0/ω
0
As previously mentioned, diplexer filter, for example the resonator of first filter segment of filter 80 and second filter segment is generally similar size.When size was similar, the admittance of this limit resonator was similar.With respect to top situation, general expression is for first filter segment and these two parts of second filter segment, Y
j, Y
IjAnd Y
Jk, and their sums have similar value.
The electric capacity of second filter segment (the i.e. C of second filter segment
j+ C
Ij+ C
Jk) with the combination capacitor of first filter segment (the i.e. C of first filter segment
j+ C
Ij+ C
Jk) between ratio given as follows:
C
2/C
1＝[f
1tan（θ
0f
1/f
0）]/[f
2tan（θ
0f
2/f
0）]
Wherein:
f
1And f
2It is the passband central frequency of two filter segments;
f
0Be the mean value of two centre frequencies; With
θ
0Be at f
0The electrical length of place's transmission line.
Check this ratio (wherein the admittance of two filter segments be equate and cancel out each other) show: it is remarkable different value that the ratio between the node capacitor value of two filter segments of the frequency response of the diplexer filter of wishing can require the capacitance of node of two filter segments combinations of diplexer filter.Because reducing of dielectric block filter physical size, the realization with capacity cell of the capacitance that constitutes this ratio becomes unrealistic.
Top ratio C
2/ C
1Be that filter segment resonator by the supposition diplexer filter is similar structures thereby has similar admittance (with relevant impedance) value and obtain.Yet, the structure of the first and second filter segment resonators by changing this diplexer filter respectively, can make the electrical characteristic of each resonator become electrical characteristic is dissimilar (being that admittance is not similar).Therefore, the ratio of the admittance of the admittance of first filter segment and second filter segment can be write as follows:
Y
2/Y
1＝（C
2/C
1）（f
2/f
1）（tan（θ
0f
2/f
1）/tan（θ
0f
1/f
0）
Wherein:
C
2It is the capacitance of the combined joint of second filter;
C
1It is the capacitance of the combined joint of first filter;
f
2It is the passband central frequency of second filter segment;
f
1It is the common centre frequency of first filter segment;
f
0Be f
2And f
1Mean value; With
θ
0Be at f
0The electrical length of place's transmission line.
Therefore, can not obtain the frequency response of desirable diplexer filter by the relative electrical characteristics (not changing the node capacitor of resonator, all capacitance sums of promptly any node) that change first filter segment and the second filter segment transmission line.Can obtain this change of the filter characteristic of diplexer filter by the geometry that changes different filter segment resonators.
Referring to the perspective view of Fig. 3, the figure shows the diplexer filter of first preferred embodiment of the present invention, represent whole diplexer filter with label 280 here.Filter 280 can schematically show with the electrical schematic diagram of the filter 80 of Fig. 2.Filter 280 is general as a kind of block configuration, and is made up of a kind of dielectric material.Filter 280 limits upper surface 284, lower surface 286, first side 288, second side 290, front 292 and back 294.The electric conducting material that applies is coated with ag material typically, is added to the essential part of lower surface 286 and side 288,290 and 292.These parts part of surface 286-292 is coupled with facial plane electrically.(as below will be described to Fig. 4, the coating that is added to the electric conducting material of second side 290 be that the mode with coupling that forms first and second filter segments and antenna coupling electrode applies).
By molded or other process forms passes dielectric block a series of transmission lines of longitudinally extending of axle longitudinally, be 304,308,312,316 at this label, 320,324,328,332 and 336 representatives.Transmission line 304-336 is corresponding to the transmission line 104-136 of the circuit theory diagrams of the filter 80 of Fig. 2.Transmission line 304-336 determines the opening on the upper surface 284 of filter 280.The sidewall of determining transmission line 304-336 also uses the electric conducting material identical with applying this dielectric block outer surface material therefor to apply.Noting, when a certain oscillation frequency signal is added to above it, because transmission line 304-336 constitutes the transmission line of resonance, or is " resonator " more simply, and the following used terms transferred line resonator of institute is interchangeable sometimes.
The structure that shall also be noted that coated area on upper surface 284 only is for illustrative purposes.Usually on the surface of practical filter, typically apply other more complicated structure.
The distance that length dimension that the size of filter 280 is typically represented according to the height dimension of representing with line segment 380, with line segment 382 and the ground level of representing with line segment 384 separate is determined.
The length of the height dimension decision resonance line 304-336 of this filter, these transmission lines pass dielectric block and longitudinally extend.In general this height dimension of filter is fixing basically, because the length of transmission line 304-336 must be proportional to the wavelength (in the material of dielectric block) of the oscillator signal of the filtering part that is added to the filter that will pass through.(because wavelength is inversely proportional to frequency, the length of transmission line 304-336 also is inversely proportional relevant with the signal frequency of the filtering part that is added to this filter.）。When the length of such transmission line is proportional to when being added on it signal wavelength, transmission line 304-336 only constitutes resonance line.Therefore, for any specific diplexer filter structure, the height dimension of filter 280 is fixed basically.
Pass the resonator that fare 304,308,312 and 316 comprises first filtering part of diplexer filter 280.Transmission line 304 configurations and 336 constitute the filter transfer function zero point of filter 280 each filter segments, and transmission line 308-316 and 320-332 configuration constitute the filter transfer function limit of each filter segment.Transmission line 320,324,328,332 and 336 comprise the resonator of diplexer filter 280 second filter segments.The cross-sectional area of the center conductor of all transmission line 304-336 is circular; But the length of the diameter of the transmission line 304-316 cross-sectional area of first filter segment is greater than transmission line 320,324, the respective length of 328,332 and 336 cross-sectional area diameters.Since the structure difference of the transmission line of the filter segment that separates of filter 280, the electrical characteristic of these resonators, that is the admittance of each transmission lines is inequality.The ratio by suitably selecting transmission-line admittance and the geometry of the transmission line of selective filter part suitably just can be selected the filter characteristic of the filter segment that separates as required.
Fig. 4 is the view of seeing below second side surface of the delectric filter 280 of Fig. 3.As top simple description, the electric conducting material that is coated in surface 290 applies in one way and forms the input coupling electrode of each filter and be used for two filter partly and the public coupling electrode that is connected antenna.The bottom view of Fig. 4 is represented the input coupler 376 and 384 and antenna coupler 392 of first and second filtering part of filter 280 respectively.
Fig. 5 is the plan view that the diplexer filter of another preferred embodiment of the present invention is seen from the upper surface 584 of filter, usually represents this duplexer filter with label 580 here.The upper surface 584 of Fig. 5 filter 580 is corresponding to the upper surface 284 of Fig. 3 filter 280.Transmission line 604,608,612,616,620,624,628,632 and 636 pass diplexer filter 580 edge longitudinal axiss separately extends, and its mode is similar to the corresponding formation of the transmission line 304-336 of the filter 280 of Fig. 3.And coated portion 638,638 ', 642,646,650,652,658,662,666,670,670 ' and 674 coated on the upper surface 584 of duplexer filter 580.The capacitive ground coupling mutually respectively of the adjacent part of coated portion 638-674.In addition, coated portion 638 and 638 ', 638 ' and 642,650 and 652,652 and 658,670 and 670 ' and 670 ' and the coupling mutually of 674 capacitives ground.Part 638,642,646,650,658,662,666,670 and 674 is capacitive ground loading resonator separately also.
Transmission line 604,608,612 and 616 comprises the resonator of first filter segment of diplexer filter 580; Transmission line 620,624,628,632 and 636 comprise the resonator of second filter segment of duplexer filter 580. Transmission line 604 and 636 is configured as the filter transfer function zero point of each filter segment that forms filter 580, and transmission line 608-616 and 620-632 configuration constitute the filter transfer function limit of each filter segment.The cross-sectional area of the transmission line 620-636 of second filter segment of the cross-sectional area of transmission line 604-616 and filter 580 is inequality on geometrical configuration.Here, the cross section of transmission line 604-616 is round basically.Yet the cross section of transmission line 620-636 extends crossing on the transmission line y direction.For example, 678 longitudinal axiss of representing transmission line 620.On behalf of transmission line, line 628 crossing elongation on the longitudinal axis 678 directions.
Can express the similar elongation of the transverse axis of other transmission line similarly.Because the transmission line of first filter segment of duplexer filter 580 is inequality with the transmission line of second filter segment of diplexer filter on geometric configuration, then the electrical characteristic of each filter segment transmission line, be the admittance difference.By suitably selecting the relative size of separation filter part transmission line, just can access the frequency response of the diplexer filter of hope.
Referring to the plan view of Fig. 6, the diplexer filter of the another preferred embodiment of the present invention of seeing from filter 780 upper surfaces 784 is usually represented this diplexer filter with label 780 here.
Transmission line 804,808,812,816,820,824,828,832 and 836 pass the filter 780 edge longitudinal axis separately extends.The coated portion 838,838 of electric conducting material ', 842,846,850,852,858,862,866,870,870 ' and 874 be applied on the upper surface 784.Adjacent coated portion 838-874 capacitively is coupled.
Transmission line 804,808,812 and 816 constitute the resonator of first filter segment of diplexer filter 780.Transmission line 820,824,828,832 and 836 constitute the resonator of second filter segment of diplexer filter 780. Transmission line 804 and 836 is configured to constitute the zero point of the filter transfer function of filter 780 each filter segments, and transmission line 808-816 and 820-832 are configured to constitute the limit of the filter transfer function of each filter segment.The cross-sectional area of transmission line 804-816 extends in the direction that each transmission line crosses the longitudinal axis.For example, 875 longitudinal axis of representing transmission line 816; On behalf of transmission line, line 877 extend on the direction of crossing the longitudinal axis 875.Similarly, the cross-sectional area of transmission line 820-836 also prolongs on the transmission line y direction crossing separately.For example, 878 longitudinal axis of representing transmission line 820; Line 882 represents transmission line in the elongation of crossing on the longitudinal axis 878 directions.
Transmission line 804-816 is crossing elongation on the y direction at the elongation that crosses on the y direction less than transmission line 820-836.Therefore, the geometry difference of each filter segment resonator of diplexer filter 780, and also the electrical characteristic of this transmission line is also different.
By the accurate dimension of suitable selective filter transmission line partly, the frequency response of each filter segment of the diplexer filter 780 that can obtain wishing.
Fig. 7 is the plane graph that diplexer filter is according to a further advantageous embodiment of the invention seen from the upper surface 984 of diplexer filter, usually represents this diplexer filter with label 980 here.
The sectional area of the sectional area of the transmission line 1004-1016 of first filter segment and the transmission line 1020-1036 of second filter segment is inequality on geometry.Here, the cross section of transmission line 1004-1016 extends crossing on the direction of its longitudinal axis.For example, the longitudinal axis of representing transmission line 1016 with point 1075; Line 1077 is represented on the direction of crossing the longitudinal axis 1075 and is extended.The cross section of transmission line 1020-1036 is round.
Because the geometry of the transmission line 1004-1016 of first filter segment and the transmission line 1020-1036's of second filter segment is inequality, so the electrical characteristic of the transmission line of different filter segments, promptly their admittance is also inequality.The size of the transmission line by suitably selecting two filter segments, the electrical characteristic of the filter segment of the diplexer filter that can obtain wishing.
Fig. 8 is the plane graph that the diplexer filter of another one preferred embodiment of the present invention is seen from the upper surface 1184 of diplexer filter 118, usually represents this diplexer filter with label 1180.
Diplexer filter 1180 comprises transmission line 1204,1208,1212,1216,1220,1224,1228,1232 and 1236.Coated portion 1238,1238 ', 1242,1246,1250,1256,1252,1256,1262,1266,1270,1270 ' and 1274 be applied on the upper surface 1184, thus the adjacent part of coated portion be capacitive be coupled.Part 1238,1242,1246,1250,1262,1266,1270 and 1274 also load resonator separately.
Transmission line 1204-1216 comprises the resonator of first filter segment, and transmission line 1220-1236 then comprises the resonator of second filter segment of diplexer filter 1180.The transmission line of the diplexer filter 1180 corresponding transmission line with the diplexer filter 980 of Fig. 7 dimensionally is identical, so its details will no longer be described.
The transmission line 1204-1216 and the 1220-1236 of diplexer filter 1180 do not separate equidistantly.On the contrary, the interval between the transmission line of each filter segment separates with irregular interval.Line segment 1278,1282,1284,1288,1292,1296 is different with some line segment lengths of 1298, and between the adjacent transmission line of their expression transmission line 1204-1216 and 1220-1236 is irregular at interval.Can select this species diversity at interval between the adjacent transmission line further to change the electrical characteristic of this filter segment, and then change the frequency response of the filter segment of diplexer filter 1180.
Fig. 9 is the plane graph that the diplexer filter of another preferred embodiment of the present invention is seen from the upper surface 1384 of diplexer filter 1380, usually represents this diplexer filter with label 1380.
Diplexer filter 1380 comprises transmission line 1404,1408,1412,1416,1420,1424,14428,1432 and 1436, and these transmission lines pass diplexer filter and extend along its longitudinal axis.The coated portion 1438,1438 of electric conducting material ', 1442,1446,1450,1452,1456,1462,1466,1470,1470 ' and 1474 on the upper surface of diplexer filter, apply.The adjacent part capacitive ground coupling mutually of coated portion.Equally, coated portion 1438 and 1438 ', 1438 ' and 1442,1450 and 1452,1452 and 1456,1470 and 1470 ', 1470 ' and 1474 also capacitive ground couplings mutually.Part 1438,1442,1446,1450,1458,1462,1466,1470 and 1474 also load resonator separately.
Transmission line 1404,1408,1412 and 1416 comprise the resonator of first filter segment of diplexer filter; Transmission line 1420,1424,1428,1432 and 1436 comprise the resonator of second filter segment of diplexer filter.The zero point of the filter transfer function of each filter segment of transmission line 1404 and 1436 configuration formation filters 1380, and transmission line 1408-1416 and 1420-1432 configuration constitute the limit of the filter transfer function of each filter segment.
The transmission line 1408 of first filter segment and 1416 cross section are different on geometry with the cross section of the transmission line 1412 of first filter segment.At this, although the cross section of all three transmission lines 1408,1412 and 1416 all is circular, the cross-sectional diameter of transmission line 1412 is greater than the cross-sectional diameter of transmission line 1408 and 1416.
The transmission line 1424 of the transmission line 1420 of second filter segment and 1428 the cross section and second filter and 1432 cross section are inequality on geometry.Here, transmission line 1424 and 1432 cross section extend crossing on its y direction, and the cross section of transmission line 1420 and 1428 is circular.
Figure 10 is the plane graph that the diplexer filter of another preferred embodiment of the present invention is seen from the upper surface 1584 of diplexer filter 1580, usually represents this diplexer filter with label 1580.
Diplexer filter 1580 comprises transmission line 1604,1608,1612,1616,1620,1624,1628,1632 and 1636, and these transmission lines pass diplexer filter and extend along its longitudinal axis.The coated portion 1638,1638 of electric conducting material ', 1642,1646,1650,1652,1656,1662,1666,1670,1670 ' and 1674 be applied on the upper surface 1584 of diplexer filter.The adjacent part capacitive ground coupling mutually of coated portion.Equally, coated area 1638 and 1638 ', 1638 ' and 1642,1650 and 1652,1652 and 1656,1670 and 1670 ' and 1670 ' and 1674 also capacitive ground couplings mutually.Part 1638,1642,1646,1650,1656,1662,1666,1670 and 1674 also loads resonator separately.
Transmission line 1604,1608,1612 and 1616 comprises the resonator of first filter segment of diplexer filter; Transmission line 1620,1624,1628,1632 and 1636 comprise the resonator of second filter segment of diplexer filter.
The zero point of the filter transfer function of each filter segment of transmission line 1604 and 1636 configuration formation filters 1580, and transmission line 1608-1616 and 1620-1632 configuration constitute the limit of the filter transfer function of each filter segment.
The cross section of the transmission line 1608 of first filter segment and 1616 cross section and transmission line 1612 is inequality on geometry.Here, transmission line 1608,1612 and 1616 cross section all extend crossing on the direction of its longitudinal axis; But the elongation of transmission line 1608 and 1616 lateral shafts is less than the elongation of transmission line 1612 lateral shafts.
The change of the geometry of adjacent resonators influences the coupling between this adjacent resonators and the loading capacitance amount of each resonator.Therefore, the geometry of selective resonance device just can be determined the filter characteristic of diplexer filter.
The transmission line 1624 of the transmission line 1620 of second filter segment and 1628 the cross section and second filter segment and 1632 cross section are inequality on geometry.Here, transmission line 1620 and 1628 cross section are one first quantity of elongation on the direction of the longitudinal axis that crosses each resonator 1620 and 1628, and the cross section of transmission line 1624 and 1632 is one second quantity of elongation on the direction of the longitudinal axis that crosses each resonator 1624 and 1632.
Filter 1580 further comprises V-arrangement recess 1678 and 1680, forms longitudinally to extend along the opposite flank of the filter between transmission line 1608 and 1612.Similarly, the apparent surface along the filter between transmission line 1612 and 1616 constitutes V-arrangement recess 1682 and 1684; Apparent surface along the filter between transmission line 1620 and 1624 constitutes V-arrangement recess 1686 and 1688; Apparent surface along the filter between transmission line 1624 and 1628 constitutes V-arrangement recess 1690 and 1692; And constitute V-arrangement recess 1694 and 1696 along the apparent surface of the filter between transmission line 1628 and 1632.
Recess 1678-1696 changes the electromagnetic coupled amount between the adjacent transmission line.By the dielectric material (by molding or other process) of removing a large amount of dielectric blocks, the electromagnetic coupled amount is reduced between this adjacent transmission lines.The degree of depth of this recess has determined the amount that electromagnetic coupled reduces between the adjacent transmission lines.
The size of each transmission line by two filter segments of suitable selection, the electrical characteristic of the filter segment of the diplexer filter that can obtain wishing.
Figure 11 is the wireless telephonic block diagram of a radio set as working in cellular communication system, usually represents this radio set with label 1750.Transceiver 1756 comprises a duplexer, for example the duplexer of the part of its transceiver of conduct shown in one of earlier drawings.
The signal that sends to transceiver 1750 is received by antenna 1756, and generation is represented its signal and is added to filter 1768 on online 1762.Filter 1768 is corresponding to first filter segment of the filter duplexer of one of earlier drawings.Produce the signal of a filtering on the filter 1768 online 1774, this signal is added to receiver circuit 1778.Receiver circuit 1778 is carried out the down-conversion of following received signal and the function of demodulation, as the situation of routine.1786 pairs of signals that sent by transceiver 1750 of transmitter circuitry are modulated and up-conversion, and produce a signal on online 1790, and this signal is added to filter circuit 1794.Filter circuit 1974 is corresponding to second filter segment of a duplexer in the filter duplexer of earlier drawings, and the signal of a filtering of this filter circuit generation, by line 1762 this signal is added to antenna 1756 and sends.
Referring to the logical flow chart of Figure 12, represented preferred embodiment of the present invention method at last, usually represented this method with label 1850.At first, shown in square frame 1856, formation has the first filter circuit part of at least two resonators, and this resonator is axle longitudinally extension basically longitudinally between the upper and lower surface of dielectric block.First resonator of at least two resonators is the cross-sectional area of first kind of structure, and second resonator of at least two resonators is cross-sectional areas that its geometry is different from second kind of structure of first structure.Secondly, as square frame 1862 expressions, formation has the second filter circuit part of at least one resonator, and this resonator is axle longitudinally extension basically longitudinally between the upper and lower surface of dielectric block.
Although in that invention has been described in conjunction with the preferred embodiment shown in each figure, be understood that, without departing from the spirit and scope of the present invention, can use other similar embodiment, and can the embodiment that describe be made amendment and replenish to carry out identical functions of the present invention.Therefore, the present invention is not limited in any single embodiment, but explains its width and scope according to appended claim.
Claims (11)
1, a kind of comb filter structure, it is made of the dielectric block that limits upper surface, lower surface and the first and second sides at least, and above-mentioned filter construction comprises:
The first filter circuit part by the first of dielectric block constitutes is used to respond first input signal.Apply and produce one first filtering signal, the first filter circuit part that at least one resonator of being determined by the sidewall of at least one cavity constitutes, this cavity forms between the upper surface of dielectric block and lower surface longitudinally that axle longitudinally extends basically, and this at least one syntonizer has the cross section of the secondary closure curve that forms at least one first structure;
By the second filter circuit part that the second portion of the dielectric block that is placed on the first that is adjacent to dielectric block forms, this dielectric block constitutes the first filter circuit part, and above-mentioned second filter circuit partly is used to respond second input signal.Apply and produce one second filtering signal, the second filter circuit part that at least one resonator of being determined by the sidewall of at least one cavity constitutes, this cavity forms longitudinally between the upper surface of dielectric block and lower surface, and axle longitudinally extends basically, and has the secondary closure cross-section curves that constitutes second structure, this second structure is by limiting along the lateral shaft that crosses the y direction prolongation, wherein, the cross section of second structure is different from the cross section of first structure; With
Distinguishing the coated with conductive material on first and second sides of dielectric block and on the sidewall of first and second filter circuits at least one resonator partly.
2, according to the filter construction of claim 1, wherein, the cross section of first structure comprises the circular cross section with first diameter and the cross section of second structure comprises the circular cross section with second diameter.
3, according to the filter construction of claim 2, wherein, the length of first diameter of the circular cross section of first structure is less than the length of second diameter of the circular cross section of second structure.
4, according to the filter construction of claim 1, wherein, the cross section of first structure comprises the circular cross section of first diameter, and the cross section of second structure comprises that is being crossed a cross section that extends on the y direction of this resonator, and this resonator of formation passes second filter circuit and partly extends.
5, according to the filter construction of claim 4, wherein the size of the area determined of the cross section of first structure is less than the cross section of second structure.
6, according to the filter construction of claim 1, wherein the cross section of first structure is crossing one first length of elongation on the longitudinal axis direction of this resonator, the resonator that forms passes first filter circuit and partly extends, and the second structure cross section is crossing one second length of elongation on the longitudinal axis direction of this resonator, and the resonator of formation passes second filter circuit and partly extends.
7, according to the filter construction of claim 6, wherein the area size determined of the cross section of first structure is less than the cross section of second structure.
8, according to the filter construction of claim 1, wherein above-mentioned at least one resonator of first filter circuit part comprises each interval separately first resonator and second resonator of one first spacing distance.
9, filter construction according to Claim 8, above-mentioned at least one resonator of wherein above-mentioned second filter circuit part comprise each interval separately first resonator and second resonator of one second spacing distance.
10, according to the filter construction of claim 1, wherein at least one resonator of first filter circuit part is one first characteristic admittance, and at least one resonator of second filter circuit part is one second characteristic admittance.
11, according to the filter construction of claim 1, wherein the cross section of first structure comprises one first resonator and one second resonator, wherein, the cross-sectional structure of secondary closure curve that constitutes first resonator of first filter circuit part is different from the cross-sectional structure of secondary closure curve of second resonator of first filter circuit part.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US88808992A | 1992-05-26 | 1992-05-26 | |
| US888,089 | 1992-05-26 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1082773A true CN1082773A (en) | 1994-02-23 |
| CN1029340C CN1029340C (en) | 1995-07-12 |
Family
ID=25392506
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN93106228.4A Expired - Fee Related CN1029340C (en) | 1992-05-26 | 1993-05-25 | Multi-passband dielectric filter construction |
Country Status (9)
| Country | Link |
|---|---|
| JP (1) | JP3205337B2 (en) |
| KR (1) | KR970000059B1 (en) |
| CN (1) | CN1029340C (en) |
| CA (1) | CA2114029C (en) |
| FI (1) | FI940399A0 (en) |
| FR (1) | FR2693037B1 (en) |
| GB (1) | GB2273393B (en) |
| IT (1) | IT1261678B (en) |
| WO (1) | WO1993024968A1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1053998C (en) * | 1995-05-31 | 2000-06-28 | 株式会社村田制作所 | Dielectric filter and antenna duplexer |
| CN103246538A (en) * | 2013-05-16 | 2013-08-14 | 中国电子科技集团公司第四十一研究所 | Microwave apparatus circuit board intelligentizing plug-in method |
Families Citing this family (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4319241A1 (en) * | 1993-06-09 | 1994-12-15 | Siemens Matsushita Components | Monolithic microwave ceramic filter |
| US5502422A (en) * | 1994-08-12 | 1996-03-26 | Motorola, Inc. | Filter with an adjustable shunt zero |
| US5748058A (en) * | 1995-02-03 | 1998-05-05 | Teledyne Industries, Inc. | Cross coupled bandpass filter |
| JPH10308604A (en) * | 1997-03-05 | 1998-11-17 | Murata Mfg Co Ltd | Dielectric filter, dielectric duplexer and designing method therefor |
| US6087909A (en) * | 1996-03-06 | 2000-07-11 | Murata Manufacturing Co., Ltd. | Dielectric filter having at least one stepped resonator hole with an elongated cross-section |
| ATE280441T1 (en) * | 1998-03-18 | 2004-11-15 | Epcos Ag | MICROWAVE CERAMIC FILTER WITH IMPROVED SIDE STEEPNESS |
| JPH11312902A (en) * | 1998-04-30 | 1999-11-09 | Murata Mfg Co Ltd | Dielectric filter, transmission/reception equipment and communication equipment |
| TW472444B (en) * | 1998-07-08 | 2002-01-11 | Samsung Electro Mech | A duplexer dielectric filter |
| US6169465B1 (en) | 1998-07-08 | 2001-01-02 | Samsung Electro-Mechanics Co., Ltd. | Duplexer dielectric filter |
| KR100375583B1 (en) * | 2000-11-18 | 2003-03-15 | 센티스 주식회사 | A dielectric filter and duplexer dielectric filter for removing higher-order mode harmonic frequency and for improving skirt and spurious response |
| JP3788384B2 (en) * | 2001-05-30 | 2006-06-21 | 株式会社村田製作所 | Dielectric filter, dielectric duplexer, and communication device |
| JP2003318606A (en) | 2002-04-23 | 2003-11-07 | Sanyo Electric Co Ltd | Dielectric filter |
| JP3883902B2 (en) | 2002-04-25 | 2007-02-21 | 三洋電機株式会社 | Dielectric filter |
| US9202660B2 (en) | 2013-03-13 | 2015-12-01 | Teledyne Wireless, Llc | Asymmetrical slow wave structures to eliminate backward wave oscillations in wideband traveling wave tubes |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6152003A (en) * | 1984-08-21 | 1986-03-14 | Murata Mfg Co Ltd | Dielectric filter |
| US4742562A (en) * | 1984-09-27 | 1988-05-03 | Motorola, Inc. | Single-block dual-passband ceramic filter useable with a transceiver |
| US4954796A (en) * | 1986-07-25 | 1990-09-04 | Motorola, Inc. | Multiple resonator dielectric filter |
| JPH01213002A (en) * | 1988-02-22 | 1989-08-25 | Fuji Elelctrochem Co Ltd | dielectric duplexer |
| US4879533A (en) * | 1988-04-01 | 1989-11-07 | Motorola, Inc. | Surface mount filter with integral transmission line connection |
| US5109536A (en) * | 1989-10-27 | 1992-04-28 | Motorola, Inc. | Single-block filter for antenna duplexing and antenna-summed diversity |
| US5208566A (en) * | 1992-01-21 | 1993-05-04 | Motorola, Inc. | Dielectric filter having adjacently-positioned resonators of dissimilar cross-sectional dimensions and notched side surface |
-
1993
- 1993-04-19 KR KR1019940700215A patent/KR970000059B1/en not_active IP Right Cessation
- 1993-04-19 WO PCT/US1993/003693 patent/WO1993024968A1/en active Application Filing
- 1993-04-19 GB GB9400899A patent/GB2273393B/en not_active Expired - Lifetime
- 1993-04-19 JP JP50052694A patent/JP3205337B2/en not_active Expired - Lifetime
- 1993-04-19 CA CA002114029A patent/CA2114029C/en not_active Expired - Lifetime
- 1993-05-24 IT ITRM930345A patent/IT1261678B/en active IP Right Grant
- 1993-05-25 CN CN93106228.4A patent/CN1029340C/en not_active Expired - Fee Related
- 1993-05-26 FR FR9306297A patent/FR2693037B1/en not_active Expired - Lifetime
-
1994
- 1994-01-26 FI FI940399A patent/FI940399A0/en unknown
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1053998C (en) * | 1995-05-31 | 2000-06-28 | 株式会社村田制作所 | Dielectric filter and antenna duplexer |
| CN103246538A (en) * | 2013-05-16 | 2013-08-14 | 中国电子科技集团公司第四十一研究所 | Microwave apparatus circuit board intelligentizing plug-in method |
| CN103246538B (en) * | 2013-05-16 | 2016-12-28 | 中国电子科技集团公司第四十一研究所 | Make the intelligentized plug-in method of microwave apparatus circuit board |
Also Published As
| Publication number | Publication date |
|---|---|
| KR970000059B1 (en) | 1997-01-04 |
| ITRM930345A1 (en) | 1994-11-24 |
| FI940399A (en) | 1994-01-26 |
| FR2693037B1 (en) | 1995-08-04 |
| JP3205337B2 (en) | 2001-09-04 |
| WO1993024968A1 (en) | 1993-12-09 |
| FR2693037A1 (en) | 1993-12-31 |
| GB9400899D0 (en) | 1994-04-13 |
| GB2273393A (en) | 1994-06-15 |
| JPH06509693A (en) | 1994-10-27 |
| FI940399A0 (en) | 1994-01-26 |
| ITRM930345A0 (en) | 1993-05-24 |
| GB2273393B (en) | 1996-09-04 |
| CN1029340C (en) | 1995-07-12 |
| CA2114029A1 (en) | 1993-12-09 |
| IT1261678B (en) | 1996-05-29 |
| CA2114029C (en) | 1997-11-18 |
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