CN203039064U - Filter and communication radio frequency device using the filter - Google Patents
Filter and communication radio frequency device using the filter Download PDFInfo
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- CN203039064U CN203039064U CN 201220748331 CN201220748331U CN203039064U CN 203039064 U CN203039064 U CN 203039064U CN 201220748331 CN201220748331 CN 201220748331 CN 201220748331 U CN201220748331 U CN 201220748331U CN 203039064 U CN203039064 U CN 203039064U
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Abstract
The utility model discloses a filter and a communication radio frequency device using the filter. The filter comprises a first cavity, a second cavity, a third cavity, first material resonators vertically installed in the first cavity and the second cavity, a second material resonator vertically installed in the third cavity, a coupling window and a filtering coupling component. The coupling window is arranged between the first cavity and the third cavity so that the first cavity is directly communicated with the third cavity. The filtering coupling component comprises a first coupling portion arranged in the third cavity, a second coupling portion arranged in the first cavity and a connection portion. The first material resonator of the second cavity is coupled with the second material resonator. The first material resonator of the first cavity is coupled with the second material resonator via the filtering coupling component so as to filter a signal whose preset frequency is lower than a passband frequency of the filter. According to the utility model, an inhibition point with a high attenuation coefficient is formed in an area whose frequency is lower than the passband frequency so that usage performance of the filter is effectively improved.
Description
Technical field
The utility model relates to the signal processing technology field, specifically relates to a kind of filter, also relates to a kind of communication radio frequency device that adopts this filter.
Background technology
As everyone knows, filter is applied in the signal transmission system, for example microwave communication, radar navigation, electronic countermeasures, satellite relay, missile guidance, test instrumentation etc., be used for extracting useful signal by filter, suppress useless interference signal, make communication equipment keep normal work.The performance of filter is mainly reflected in self subsidiary loss and to the inhibition degree of useless or interference signal, and the quality factor by resonator self determines, quality factor has another name called the Q value, and the Q value of filter determines the loss of filter self to reach the inhibition degree to interference signal.
Metal material is because being easy to obtain, be easy to machine-shaping and innate advantage such as cheap, during the design that the metal resonators of being made by metal material is used in microwave filter is the earliest used, and along with the development of microwave communication obtains to use widely.But the quality factor of metal resonators is relatively limited, and the Q value is relatively low, and is difficult to increase the Q value under the certain condition of resonant cavity volume.In order to solve this technical problem, most of filter gradually adopts various ceramic materials with superior temperature stability and high Q value to come the alternative metals material, and in order to obtain higher quality factor, tend to add at ceramic material the material of high value, such as the high rare earth material of price etc.
The ceramic resonator that ceramic material makes has higher Q value, and loss is lower, satisfy present technical development easily to many demands such as the outer clutter inhibition of the band that small product size is little, loss is low and higher of filter, therefore, ceramic resonator has become most important and modal filter element.In addition, ceramic resonator usually adopts transverse electric mode ceramic resonator (or claiming TE mould ceramic resonator), but often needs to use a plurality of TE mould ceramic resonator common combinations to form the TE mode filter; Therefore, under the prerequisite that can't change the resonator use amount, because material and production technology former thereby cause its production cost high.
Also there are the ceramic resonator of employing and metal resonators to mix in the prior art and take the filter of use, for example in first cavity that arranges in regular turn, relative set first ceramic resonator, second ceramic resonator and metal resonators in second cavity and in the 3rd cavity, this has reduced production cost to a certain extent; But the index request at some communication systems, when specifying effects such as signal to the band connection frequency section that is lower than filter filters as needs, this ceramic resonator of prior art mixes the mode of taking with metal resonators can't realize this similar index request, and causes the serviceability of filter to have defective.
The utility model content
There is the technical problem of defective in the performance that the utility model mainly solves the prior art filter, a kind of filter is provided and has adopted the communication radio frequency device of this filter, can improve the serviceability of filter effectively.
For solving the problems of the technologies described above, the technical scheme that the utility model adopts is: a kind of filter is provided, comprise first cavity, second cavity and the 3rd cavity that at interval arrange and be communicated with in regular turn, and vertically be installed on the first material resonances device of this first cavity bottom and this second cavity bottom, vertically be installed on the second material resonances device of the 3rd cavity bottom.This filter also comprises coupling window and filtering male part: this coupling window is located between this first cavity and the 3rd cavity so that this first cavity and the 3rd cavity directly are communicated with; This filtering male part comprises first coupling part be located in the 3rd cavity, is located at second coupling part in this first cavity and the convergence part that connects this first coupling part and this second coupling part.The first material resonances device of this second cavity and the coupling of this second material resonances device, the magnetic field that this first material resonances device of this first cavity produces is passed this second coupling part and is cooperated the first equivalent magnetic flux window that forms with this first cavity, the magnetic field that this second material resonances device produces is passed this first coupling part and is cooperated the second equivalent magnetic flux window that forms with the 3rd cavity, and this first material resonances device of this first cavity and this second material resonances device are coupled via this filtering male part and filter with the signal that preset frequency is lower than the band connection frequency of this filter.
Wherein, offer the transmission window that realization is connected between this second cavity and the 3rd cavity, this filter also comprises the transmission male part, and this transmission male part comprises to be located at the 3rd interior coupling part of the 3rd cavity, to be located at the 4th coupling part in this second cavity and to connect the 3rd coupling part and the connecting portion of the 4th coupling part; The magnetic field that this first material resonances device of this second cavity produces is passed the 4th coupling part and is cooperated the C grade that forms to imitate the magnetic flux window with this second cavity, the magnetic field that this second material resonances device produces is passed the 3rd coupling part and is cooperated the fourth class that forms to imitate the magnetic flux window with the 3rd cavity, makes this first material resonances device of this second cavity and this second material resonances device realize coupling via this transmission male part.
Wherein, this first material resonances device is ceramic resonator, and this second material resonances device is metal resonators, and the direction in the magnetic field that this first material resonances device produces is vertical mutually with the direction in the magnetic field that this second material resonances device produces.
Wherein, the material of this filtering male part is electric conducting material, and insulation arranges between this convergence part and this coupling window.The bottom of this first coupling part and the 3rd cavity electrically connects, the main body of this first coupling part and this second material resonances device arranges at interval and the axial line of the straight line at its place and this second material resonances device is parallel to each other, the bottom by this convergence part, this first coupling part, the 3rd cavity and the sidewall of the 3rd cavity cooperate and form this second equivalent magnetic flux window.The bottom of this second coupling part and this coupling window electrically connects, the main body of this second coupling part arrange at interval with this first material resonances device of this first cavity and the straight line at its place vertical mutually with the axial line of this first material resonances device, the bottom by this convergence part, this second coupling part and this coupling window cooperates and forms this first equivalent magnetic flux window.
Wherein, the material of this transmission male part is electric conducting material, and insulation arranges between this connecting portion and this transmission window.The bottom of the 3rd coupling part and the 3rd cavity electrically connects, the main body of the 3rd coupling part and this second material resonances device arranges at interval and the axial line of the straight line at its place and this second material resonances device is parallel to each other, the bottom by this connecting portion, the 3rd coupling part, the 3rd cavity and the sidewall of the 3rd cavity cooperate and form this fourth class and imitate magnetic flux window.The bottom of the 4th coupling part and this transmission window electrically connects, the main body of the 4th coupling part arrange at interval with this first material resonances device of this second cavity and the straight line at its place vertical mutually with the axial line of this first material resonances device, the bottom by this connecting portion, the 4th coupling part and this transmission window cooperates and forms this C grade and imitate magnetic flux window.
Wherein, this first equivalent magnetic flux window is positioned at first side of this convergence part and this C grade imitates the magnetic flux window and is positioned at first side of this connecting portion so that the installation set-up mode of this filtering male part and this transmission male part is consistent, and then makes that the magnetic field energy direction that is coupled between this first material resonances device of the magnetic field energy direction that is coupled between this first material resonances device and this second material resonances device of this first cavity and this second cavity and this second material resonances device is opposite.
Wherein, this filtering male part is identical with the structure of this transmission male part.
Wherein, the material of this filtering male part and/or this transmission male part is metal, unsettled this coupling window that runs through of this filtering male part, unsettled this transmission window that runs through of this transmission male part.
Wherein, this filter comprises signal input part and signal output part, and this signal input part is located at this first cavity, and this signal output part is located at the 3rd cavity.
For solving the problems of the technologies described above, another technical scheme that the utility model adopts is: a kind of communication radio frequency device is provided, this communication radio frequency device comprises above-mentioned filter, and this filter is located at the transceiver circuit part of this communication radio frequency device, is used for signal is selected.
Wherein, this communication radio frequency device is single multiplexer, duplexer, splitter, mixer or tower amplifier.
The beneficial effects of the utility model are: the situation that is different from prior art, the utility model arranges coupling window between first cavity and the 3rd cavity, during work, the magnetic field that the first material resonances device produces is passed the magnetic field of the first equivalent magnetic flux window and the generation of the second material resonances device and is passed the second equivalent magnetic flux window, operation principle according to galvanomagnetic effect between two magnetic field is coupled, and then has realized that filter filters the signal that preset frequency is lower than the band connection frequency of this filter.The utility model has formed the inhibition point of a high attenuation coefficient by the combining form of coupling window and filtering male part in the zone of the band connection frequency that is lower than this filter, the perfect effectively serviceability of filter has improved the practicality of filter.
Description of drawings
In order to be illustrated more clearly in the technical scheme among the utility model embodiment, the accompanying drawing of required use is done to introduce simply in will describing embodiment below, apparently, accompanying drawing in describing below only is embodiment more of the present utility model, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is the structural representation of the utility model filter one embodiment;
Fig. 2 is the part-structure cutaway view of filter shown in Figure 1;
Fig. 3 is the structural representation of the filtering male part of filter shown in Figure 1;
Fig. 4 is the structural representation of the transmission male part of filter shown in Figure 1;
Fig. 5 is the transmission response curve chart of prior art filter; And
Fig. 6 is the transmission response curve chart when adopting the utility model filter to carry out emulation.
Embodiment
Be clearly and completely described below in conjunction with the technical scheme among the utility model embodiment of the utility model embodiment, obviously, described embodiment only is the utility model part embodiment, rather than whole embodiment.Based on the embodiment in the utility model, those of ordinary skills are not making the every other embodiment that obtains under the creative work prerequisite, all belong to the scope of the utility model protection.
The utility model embodiment provides a kind of filter, comprise first cavity, second cavity and the 3rd cavity that at interval arrange and be communicated with in regular turn, and vertically be installed on the first material resonances device of this first cavity bottom and this second cavity bottom, vertically be installed on the second material resonances device of the 3rd cavity bottom.
This filter also comprises coupling window and filtering male part: this coupling window is located between this first cavity and the 3rd cavity so that this first cavity and the 3rd cavity directly are communicated with; This filtering male part comprises first coupling part be located in the 3rd cavity, is located at second coupling part in this first cavity and the convergence part that connects this first coupling part and this second coupling part.
The first material resonances device of this second cavity and the coupling of this second material resonances device, the magnetic field that this first material resonances device of this first cavity produces is passed this second coupling part and is cooperated the first equivalent magnetic flux window that forms with this first cavity, the magnetic field that this second material resonances device produces is passed this first coupling part and is cooperated the second equivalent magnetic flux window that forms with the 3rd cavity, and this first material resonances device of this first cavity and this second material resonances device are coupled via this filtering male part and filter with the signal that preset frequency is lower than the band connection frequency of this filter.
It needs to be noted: this first material resonances device is ceramic resonator, and this second material resonances device is metal resonators.
Present embodiment is by the combining form of coupling window and filtering male part, formed the inhibition point of a high attenuation coefficient in the zone of the band connection frequency that is lower than this filter, when reducing the filter production cost, the perfect effectively serviceability of filter has improved the practicality of filter.
The utility model embodiment also provides a kind of communication radio frequency device, this communication radio frequency device comprises above-mentioned filter, this filter is located at the transceiver circuit part of this communication radio frequency device, be used for signal is selected, this communication radio frequency device is single multiplexer, duplexer, splitter, mixer or tower amplifier.
Below in conjunction with accompanying drawing the utility model embodiment is further described.
Embodiment one, see also Fig. 1 and Fig. 2, this filter can be the TE mode filter, it includes but not limited to first cavity 11, second cavity 12 and the 3rd cavity 13 that at interval arrange and be communicated with in regular turn, and vertically is installed on the first material resonances device 110,120 of first cavity, 11 bottoms and second cavity, 12 bottoms, vertically is installed on the second material resonances device 130, coupling window 14 and the filtering male part 15 of the 3rd cavity 13 bottoms.
In the present embodiment, first cavity 11, second cavity 12 and the 3rd cavity 13 all can adopt electric conducting material to make, and are preferably metal.Be pointed out that, first cavity 11, second cavity 12 and the 3rd cavity 13 can be only for being arranged at wherein a part of cavity of filter, it can also comprise and the 4th cavity and the 5th cavity etc. not limit at this.
Filtering male part 15 runs through and is arranged in the coupling window 14, and at present embodiment, filtering male part 15 is for electric conducting material makes, and its appearance do not apply non-conductive layer protection, and filtering male part 15 needs unsettled through coupling window 14.Preferably, the utility model embodiment adopts first kind of mode, be that filtering male part 15 is unsettled through coupling window 14, make and do not form short circuit between filtering male part 15 and the coupling window 14 and be connected, certainly, in other embodiments, also can be coated with insulating layer coating in the appearance of filtering male part 15, and the insulation setting between realization and the coupling window 14 does not limit at this.
See also Fig. 3, the filtering male part 15 of present embodiment specifically can comprise first coupling part 151 be located in the 3rd cavity 13, be located at second coupling part 152 in first cavity 11 and the convergence part 153 that connects first coupling part 151 and second coupling part 152.Second coupling part 152 cooperates the first equivalent magnetic flux window 1520 that forms with first cavity 11 and first coupling part 151 cooperates the second equivalent magnetic flux window 1510 of formation with the 3rd cavity 13, can realize the first material resonances device 110 of first cavity 11 and the coupling of the second material resonances device 130 by the first equivalent magnetic flux window 1520 and the second equivalent magnetic flux window 1510.Certainly, in other embodiments, the first equivalent magnetic flux window 1520 also can be formed separately by second coupling part 152, and the second equivalent magnetic flux window 1510 also can be formed separately by first coupling part 151, such as the mode of filtering male part 15 employing closing coils, and a part of closing coil is arranged in first cavity 11, and a part of closing coil is arranged in the 3rd cavity 13, can realize the magnetic field coupling, in the scope that the art personnel understand, not give unnecessary details at this.
Particularly, the material of filtering male part 15 is metal, insulation arranges between convergence part 153 and the coupling window 14, as the filtering male part 15 unsettled coupling windows 14 that run through, in example shown in Figure 3, the bottom of first coupling part 151 and the 3rd cavity 13 electrically connects, the straight line at the main body of first coupling part 151 and the 130 interval settings of the second material resonances device and its place and the axial line of the second material resonances device 130 are parallel to each other and (can certainly be a predetermined angle incline, do not limit at this), by convergence part 153, first coupling part 151, the sidewall of the bottom of the 3rd cavity 13 and the 3rd cavity 13 cooperates the formation second equivalent magnetic flux window 1510.Second coupling part 152 electrically connects with the bottom of coupling window 14, the first material resonances device 110 of the main body of second coupling part 152 and first cavity 11 arranges at interval and the axial line of the straight line at its place and the first material resonances device 110 is mutual vertical (can certainly be a predetermined angle incline, do not limit at this), cooperate the formation first equivalent magnetic flux window 1520 by the bottom of convergence part 153, second coupling part 152 and coupling window 14.Wherein, first coupling part 151 and second coupling part 152 all can by be spirally connected, the mode of riveted joint or clamping achieves a fixed connection, carefully do not state at this.
See also Fig. 4, present embodiment offers the transmission window 16 that realization is connected between second cavity 12 and the 3rd cavity 13, and in order to realize the signal coupled transfer between second cavity 12 and the 3rd cavity 13, filter also comprises transmission male part 17.Transmission male part 17 comprises the 3rd coupling part 171 be located in the 3rd cavity 13, is located at the 4th coupling part 172 in second cavity 12 and the connecting portion 173 that connects the 3rd coupling part 171 and the 4th coupling part 172.
Particularly, the material of transmission male part 17 is metal, and insulation arranges between connecting portion 173 and the transmission window 16, as the transmission male part 17 unsettled transmission windows 16 that run through.In example shown in Figure 4, the bottom of the 3rd coupling part 171 and the 3rd cavity 13 electrically connects, the straight line at the main body of the 3rd coupling part 171 and the 130 interval settings of the second material resonances device and its place and the axial line of the second material resonances device 130 are parallel to each other and (can certainly be a predetermined angle incline, do not limit at this), cooperate the formation fourth class to imitate magnetic flux window 1710 by the bottom of connecting portion 173, the 3rd coupling part 171, the 3rd cavity 13 and the sidewall of the 3rd cavity 13.The 4th coupling part 172 electrically connects with the bottom of transmission window 16, the first material resonances device 120 of the main body of the 4th coupling part 172 and second cavity 12 arranges at interval and the straight line at its place and the first material resonances device 110,120 axial line is mutual vertical (can certainly be a predetermined angle incline, do not limit at this), cooperate the formation C grade to imitate magnetic flux window 1720 by the bottom of connecting portion 173, the 4th coupling part 172 and transmission window 16.Wherein, the 3rd coupling part 171 and the 4th coupling part 172 all can by be spirally connected, the mode of riveted joint or clamping achieves a fixed connection, carefully do not state at this.
It should be noted that, the present embodiment first material resonances device 110,120 is ceramic resonator, and the second material resonances device 130 is metal resonators, and in the assembling mode shown in Figure 1, be not difficult to find out that the direction in the first material resonances device 110,120 magnetic fields that produce is vertical mutually with the direction in the magnetic field that the second material resonances device 130 produces, wherein, the first material resonances device 110,120 magnetic direction are warp direction, and the magnetic direction of the second material resonances device 130 is weft direction.In concrete coupling process, the magnetic fields that the first material resonances device 110,120 produces about the plane at the cavity bottom of correspondence and line place, top resonance and to around disperse, and vertical mutually with the plane at C grade effect magnetic flux window 1720 places with the first corresponding equivalent magnetic flux window 1520, make the material resonances device 110 of winning, 120 magnetic fields that produce be carried out magnetic coupling by the first equivalent magnetic flux window 1520 of correspondence and C grade effect magnetic flux window 1720; In like manner, the Distribution of Magnetic Field of the second material resonances device 130 is on the outer surface of the second material resonances device 130 and along the plane rotary harmonic that is parallel to place, the 3rd cavity 13 bottom, and that the second equivalent magnetic flux window 1510 and the fourth class are imitated magnetic flux window 1710 is vertical with the direction in the magnetic field of the second material resonances device 130 respectively, and therefore the magnetic-field component of the second material resonances device 130 can be passed the second equivalent magnetic flux window 1510 respectively and the fourth class is imitated magnetic flux window 1710.Furthermore, the area of equivalent magnetic flux window is more big, and the magnetic flux that correspondence is passed is more strong, and then the magnetic field energy of coupling is more big.In brief, filtering male part 15 and transmission male part 17 both the be coupled first corresponding material resonances device 110,120 magnetic field energy, the magnetic field energy of the second material resonances device 130 simultaneously has been coupled again, the material resonances device 110 of winning, 120 magnetic field energy are intercoupled with the magnetic field energy of the second material resonances device 130, and then realized the mutual transmission of microwave energy, the microwave energy that has solved well between the first material resonances device 110, the 120 and second material resonances device 130 is difficult to the problem that desirable coupling is transmitted.In addition, in order to obtain maximum magnetic flux as much as possible to carry out the transmission of microwave energy, the first equivalent magnetic flux window 1520 is vertical mutually with the plane at the second equivalent magnetic flux window, 1510 places, and C grade effect magnetic flux window 1720 is vertical mutually with the plane that the fourth class is imitated magnetic flux window 1710 places.The filter of the utility model embodiment adopts ceramic resonator and metal resonators to mix the mode of taking use, the requirements such as the outer clutter inhibition of band that small product size is little, loss is low and higher had both been satisfied, reduced the use to ceramic resonator again, thereby reduced the production cost of filter effectively, and because the reliability of metal resonators is high and its volume is less than normal, make the reliability of filter also be improved, and its volume realizes light littleization, the filter of the utility model embodiment has more practicality.
In the process that signal transmits toward second cavity, 12 to the 3rd cavitys 13 via first cavity 11: the magnetic field that the first material resonances device 120 of second cavity 12 produces is passed the 4th coupling part 172 and is cooperated the C grade that forms to imitate magnetic flux window 1720 with second cavity 12, the magnetic field that the second material resonances device 130 produces is passed the 3rd coupling part 171 and is cooperated the fourth class that forms to imitate magnetic flux window 1710 with the 3rd cavity 13, makes the first material resonances device 120 of second cavity 12 and the second material resonances device 130 realize coupling via transmission male part 17.The magnetic field that the first material resonances device 110 of first cavity 11 produces is passed second coupling part 152 and is cooperated the first equivalent magnetic flux window 1520 that forms with first cavity 11, simultaneously, the magnetic field that the second material resonances device 130 produces is passed first coupling part 151 and is cooperated the second equivalent magnetic flux window 1510 that forms with the 3rd cavity 13, the first material resonances device 110 of first cavity 11 and the second material resonances device 130 are coupled via filtering male part 15 and filter with the signal that preset frequency is lower than the band connection frequency of filter, wherein, the coupling process that it is concrete and coupling principle are no longer carefully stated in the scope that the art personnel understand.
Need to prove, under the situation of direction, intensity size and the Distribution of Magnetic Field basic fixed in the magnetic field that the first material resonances device 110, the 120 and second material resonances device 130 produce, can adjust the first equivalent magnetic flux window 1520, the second equivalent magnetic flux window 1510, C grade effect magnetic flux window 1720 and the fourth class and imitate the size of magnetic flux window 1710, corresponding magnetic field is complementary by the magnetic flux (being magnetic field energy) of corresponding equivalent magnetic flux window, thereby realize that the transmission of microwave energy or realization are filtered the signal of preset frequency etc.For example, present embodiment can be by changing convergence part 153 and connecting portion 173 length (correspondence makes win coupling part 151 or the 3rd coupling part 171 more press close to the second material resonances device 130, or correspondence makes second coupling part 152 more press close to the first material resonances device 110 and makes the 4th coupling part 172 more press close to the first material resonances device 120), can be by changing the link position of first coupling part 151 and the 3rd cavity 13, can be by changing second coupling part 152 and coupling window 14(or first cavity 11) link position, can be by changing the link position of the 3rd coupling part 171 and the 3rd cavity 13, can be by changing the 4th coupling part 172 and transmission window 16(or second cavity 12) link position, the bending mode that perhaps changes filtering male part 15 or transmission male part 17 is come the corresponding first equivalent magnetic flux window 1520 that changes, the second equivalent magnetic flux window 1510, C grade is imitated the size of magnetic flux window 1720 and fourth class effect magnetic flux window 1710, in the scope that the art personnel understand, do not give unnecessary details one by one.
Furthermore, be not difficult to find out from Fig. 3 and Fig. 4 that the structure of filtering male part 15 or transmission male part 17 is identical, in this way, make filtering male part 15 or transmission male part 17 can adopt identical Mold Making, thereby reduce production costs effectively.In order to realize that the signal that preset frequency is lower than the band connection frequency of filter filters, the structure of filtering male part 15 or transmission male part 17 is identical, simultaneously, the first equivalent magnetic flux window 1520 is positioned at first side (being the left position of convergence part 153 shown in Figure 1) of convergence part 153 and C grade imitates magnetic flux window 1720 and is positioned at first side (being the left position of connecting portion 173 shown in Figure 1) of connecting portion 173 so that the installation set-up mode of filtering male part 15 and transmission male part 17 is consistent, and then the magnetic field energy direction that is coupled between the first material resonances device 110 that makes the cavity 11 of winning and the second material resonances device 130, and the magnetic field energy direction of coupling is opposite between the first material resonances device 120 of second cavity 12 and the second material resonances device 130.And in other embodiments, filtering male part 15 or transmission male part 17 also can adopt different frame modes respectively, do not limit at this.
In addition, the filter of present embodiment also comprises signal input part 21 and signal output part 22, and signal input part 21 correspondences are located at the sidewall of first cavity 11, and signal output part 22 correspondences are located at the sidewall of the 3rd cavity 13.In other embodiments, first cavity 11, second cavity 12 and the 3rd cavity 13 also can be used as and link up in a plurality of cavitys one group that arranges, and its signal that needs to realize transmission and filter assigned frequency gets final product, and does not carefully state at this.
See also Fig. 5 and Fig. 6, Fig. 5 is the transmission response curve chart of prior art filter, Fig. 6 is that the present embodiment filter adopts HFSS(High Frequency Structure Simulator, the 3 D electromagnetic simulation software) carries out the resulting transmission response curve chart of emulation, wherein, the unit of abscissa is the MHz(megahertz), ordinate is the dB gain.Be not difficult to find out, for prior art adopts ceramic resonator and the mixed filter of taking of metal resonators, the filter of present embodiment has been realized the high inhibition point of high attenuation coefficient in the frequency band position of the band connection frequency that is lower than filter, make the signal of preset frequency can't pass through filter, response curve as shown in Figure 6 is near 2640MHz, therefore form high inhibition point, satisfied communication system etc. to the specific (special) requirements of communication radio frequency device.The specific indexes that meets the communication radio frequency device, the perfect serviceability of filter.Certainly, change the size that the first equivalent magnetic flux window 1520, the second equivalent magnetic flux window 1510, C grade effect magnetic flux window 1720 and the fourth class are imitated magnetic flux window 1710 by structure or the connected mode of adjusting filtering male part 15 and transmission male part 17, thereby obtain the response curve different with Fig. 6, do not give unnecessary details one by one at this.And as shown in Figure 6, the filter of present embodiment adopts ceramic resonator and metal resonators to mix and takes when using, satisfied the low and higher requirements such as the outer clutter inhibition of band of loss of filter, reduced the usage quantity to ceramic resonator effectively, thereby reduced production costs.
The utility model arranges coupling window 14 between first cavity 11 and the 3rd cavity 13, during work, the magnetic field that the first material resonances device 110 produces is passed the magnetic field of the first equivalent magnetic flux window 1520 and 130 generations of the second material resonances device and is passed the second equivalent magnetic flux window 1510, operation principle according to galvanomagnetic effect between two magnetic field is coupled, and then has realized that filter filters the signal that preset frequency is lower than the band connection frequency of this filter.The utility model is by the combining form of coupling window 14 and filtering male part 15, formed the inhibition point of a high attenuation coefficient in the zone of the band connection frequency that is lower than this filter, when reducing the filter production cost, the perfect effectively serviceability of filter has improved the practicality of filter.
Embodiment two, the utility model embodiment also provides a kind of communication radio frequency device that adopts above-mentioned filter, wherein this filter is located at the transceiver circuit part of communication radio frequency device, be used for signal is selected, particularly, the communication radio frequency device can be single multiplexer, duplexer, splitter, mixer or tower amplifier etc., in the scope that the art personnel understand, does not limit.
In addition, the filter of the utility model embodiment adopts ceramic resonator in first cavity 11 and second cavity 12, and in the 3rd cavity 13, adopt metal resonators to mix the mode of taking use, requirements such as the outer clutter inhibition of the low and higher band of loss had both been satisfied, reduce the use to ceramic resonator again, reduced the production cost of filter effectively; And because the reliability of metal resonators is high and its volume is less than normal, make the reliability of filter also be improved, and its volume realizes light littleization, the filter of the utility model embodiment has more practicality.
Used specific case herein principle of the present utility model and execution mode are set forth, the explanation of above embodiment just is used for helping to understand method of the present utility model and core concept thereof; Simultaneously, for one of ordinary skill in the art, according to thought of the present utility model, the part that all can change in specific embodiments and applications, in sum, this description should not be construed as restriction of the present utility model.
Claims (11)
1. filter, it is characterized in that, comprise first cavity, second cavity and the 3rd cavity that arrange and be communicated with in regular turn at interval, and vertically be installed on the first material resonances device of described first cavity bottom and described second cavity bottom, vertically be installed on the second material resonances device of described the 3rd cavity bottom, described filter also comprises:
Coupling window is located between described first cavity and described the 3rd cavity so that described first cavity and described the 3rd cavity directly are communicated with;
Filtering male part, described filtering male part comprise first coupling part be located in described the 3rd cavity, are located at second coupling part in described first cavity and the convergence part that connects described first coupling part and described second coupling part;
Wherein, the described first material resonances device of described second cavity and the coupling of the described second material resonances device, the magnetic field that the described first material resonances device of described first cavity produces is passed described second coupling part and is cooperated the first equivalent magnetic flux window that forms with described first cavity, the magnetic field that the described second material resonances device produces is passed described first coupling part and is cooperated the second equivalent magnetic flux window that forms with described the 3rd cavity, and the described first material resonances device of described first cavity and the described second material resonances device are coupled via described filtering male part and filter with the signal that preset frequency is lower than the band connection frequency of described filter.
2. filter according to claim 1 is characterized in that, offers the transmission window that realization is connected between described second cavity and described the 3rd cavity, and described filter also comprises:
Transmission male part, described transmission male part comprise the 3rd coupling part be located in described the 3rd cavity, are located at the 4th coupling part in described second cavity and the connecting portion that connects described the 3rd coupling part and described the 4th coupling part;
Wherein, the magnetic field that the described first material resonances device of described second cavity produces is passed described the 4th coupling part and is cooperated the C grade that forms to imitate the magnetic flux window with described second cavity, the magnetic field that the described second material resonances device produces is passed described the 3rd coupling part and is cooperated the fourth class that forms to imitate the magnetic flux window with described the 3rd cavity, makes the described first material resonances device of described second cavity and the described second material resonances device realize coupling via described transmission male part.
3. filter according to claim 2, it is characterized in that, the described first material resonances device is ceramic resonator, the described second material resonances device is metal resonators, and the direction in the magnetic field that the described first material resonances device produces is vertical mutually with the direction in the magnetic field that the described second material resonances device produces.
4. filter according to claim 3 is characterized in that, the material of described filtering male part is electric conducting material, and insulation arranges between described convergence part and the described coupling window:
The bottom of described first coupling part and described the 3rd cavity electrically connects, the main body of described first coupling part and the described second material resonances device arrange at interval and the straight line at its place and the axial line of the described second material resonances device are parallel to each other, and the bottom by described convergence part, described first coupling part, described the 3rd cavity and the sidewall of described the 3rd cavity cooperate and form the described second equivalent magnetic flux window;
The bottom of described second coupling part and described coupling window electrically connects, the main body of described second coupling part arrange at interval with the described first material resonances device of described first cavity and the straight line at its place vertical mutually with the axial line of the described first material resonances device, the bottom by described convergence part, described second coupling part and described coupling window cooperates and forms the described first equivalent magnetic flux window.
5. filter according to claim 4 is characterized in that, the material of described transmission male part is electric conducting material, and insulation arranges between described connecting portion and the described transmission window:
The bottom of described the 3rd coupling part and described the 3rd cavity electrically connects, the main body of described the 3rd coupling part and the described second material resonances device arrange at interval and the straight line at its place and the axial line of the described second material resonances device are parallel to each other, and the bottom by described connecting portion, described the 3rd coupling part, described the 3rd cavity and the sidewall of described the 3rd cavity cooperate and form the described fourth class and imitate the magnetic flux window;
The bottom of described the 4th coupling part and described transmission window electrically connects, the main body of described the 4th coupling part arrange at interval with the described first material resonances device of described second cavity and the straight line at its place vertical mutually with the axial line of the described first material resonances device, the bottom by described connecting portion, described the 4th coupling part and described transmission window cooperates and forms described C grade and imitate the magnetic flux window.
6. according to each described filter of claim 2 ~ 5, it is characterized in that, the described first equivalent magnetic flux window is positioned at first side of described convergence part and described C grade imitates the magnetic flux window and is positioned at first side of described connecting portion so that the installation set-up mode of described filtering male part and described transmission male part is consistent, and then makes the magnetic field energy direction that is coupled between the described first material resonances device of described first cavity and the described second material resonances device, opposite with the magnetic field energy direction that is coupled between the described first material resonances device of described second cavity and the described second material resonances device.
7. filter according to claim 6 is characterized in that, described filtering male part is identical with the structure of described transmission male part.
8. filter according to claim 5 is characterized in that, the material of described filtering male part and/or described transmission male part is metal, and described filtering male part is unsettled to run through described coupling window, and described transmission male part is unsettled to run through described transmission window.
9. filter according to claim 1 is characterized in that, described filter comprises signal input part and signal output part, and described signal input part is located at described first cavity, and described signal output part is located at described the 3rd cavity.
10. a communication radio frequency device is characterized in that, described communication radio frequency device comprises each described filter of claim 1～9, and described filter is located at the transceiver circuit part of described communication radio frequency device, is used for signal is selected.
11. communication radio frequency device according to claim 10 is characterized in that, described communication radio frequency device is single multiplexer, duplexer, splitter, mixer or tower amplifier.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220748331 CN203039064U (en) | 2012-12-31 | 2012-12-31 | Filter and communication radio frequency device using the filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220748331 CN203039064U (en) | 2012-12-31 | 2012-12-31 | Filter and communication radio frequency device using the filter |
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| Publication Number | Publication Date |
|---|---|
| CN203039064U true CN203039064U (en) | 2013-07-03 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220748331 Expired - Lifetime CN203039064U (en) | 2012-12-31 | 2012-12-31 | Filter and communication radio frequency device using the filter |
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| Country | Link |
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| CN (1) | CN203039064U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103066353A (en) * | 2012-12-31 | 2013-04-24 | 深圳市大富科技股份有限公司 | Filter and communication radio frequency device adopting the same |
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- 2012-12-31 CN CN 201220748331 patent/CN203039064U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103066353A (en) * | 2012-12-31 | 2013-04-24 | 深圳市大富科技股份有限公司 | Filter and communication radio frequency device adopting the same |
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