CN1262534A - Duplexer wave filter - Google Patents
Duplexer wave filter Download PDFInfo
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- CN1262534A CN1262534A CN 99111281 CN99111281A CN1262534A CN 1262534 A CN1262534 A CN 1262534A CN 99111281 CN99111281 CN 99111281 CN 99111281 A CN99111281 A CN 99111281A CN 1262534 A CN1262534 A CN 1262534A
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Abstract
To provide an excellent attenuation characteristic at a block band and a low insertion loss at a pass band and to make a duplex filter small in size by configuring the filter with a 1st filtering section, a 2nd filtering section and an antenna terminal connected between an inductor of the 1st filtering section and a capacitor of the 2nd filtering section or the like. The matching of the filter is adjusted by connecting an inductor L between a point of a receiving terminal and a receiving end resonator R1 and ground and connecting a capacitor C between a point of a transmission terminal and a transmission end resonator R2 and ground respectively. Or the inductor L (capacitor C) having been connected between the point of the receiving terminal and the receiving end resonator R1 and ground (the capacitor C between the point of the transmission terminal and the transmission end resonator R2 and ground) as above may be connected between the receiving resonator R1 and the antenna terminal (between the transmission end resonator R2 and the antenna terminal). The duplex filter configured as above can realize an excellent attenuation characteristic at a block band and a low insertion loss at a pass band and can be manufactured with a small size and a lightweight.
Description
The present invention relates to a kind of diplexer filter.Specifically, the present invention relates to a kind ofly wherein two are used for receiving and the resonator that transmits is cascaded in radio communication, so that its attenuation characteristic on blocking frequency band (blocking band) and the insertion loss on passband can improve, and realize the diplexer filter of advantages such as volume is little and in light weight simultaneously.
In recent years, the researcher is devoted to research and utilization intermediate orbit satellite always and can covers the mobile communication system of whole earth surface.Therefore, the portable satellite telephone service is extremely urgent.A kind of canonical system wherein is ICO (middle circuit orbit) (intermediate circularorbit), comprises that 12 satellites that a plurality of company produced of Britain ICO company have just formed a global network and utilize.Even like this earthwave the zone that can not arrive also can freely use this kind mobile communication system to communicate.ICO company is developing the portable satellite terminal of a kind of miniature and light-duty (having only 250g or lighter) at present.Under this background, duplexer also must be able to satisfy the little and lightweight requirement of volume.Compare with earthwave in addition, be transmitted on the satellite or to receive the signal that comes from satellite all very faint.Therefore, its insertion loss must be less than the insertion loss of land mobile communication system.
Usually,, have waveguide filter, banded filter, and type such as dielectric resonator filter as filter.Wherein in mobile communication terminal, the most widely used is to satisfy requirement and the very good dielectric resonator filters of filtering characteristic such as microminiaturized and light weight.Owing in most of mobile communication terminals, all need to carry out two-way communication.Therefore, the normal duplexer dielectric filter that links to each other with antenna port that uses to carry out filtering at receiving terminal and transmitting terminal simultaneously.Method as for constituting duplexer dielectric filter has a kind of method to be to use the resonator of separation, has a kind of method to be to use the monolithic dielectric resonator that wherein is formed with a plurality of resonators on an independent medium block.
Different on this two media resonator structure, but its something in common is wherein all to have a plurality of resonators to link to each other with a transmission lines, and the coupling between the resonator then utilizes and regulates such as passive components such as inductance L and capacitor C.
Figure 1 shows that the schematic diagram of conventional diplexer filter equivalent electric circuit.As shown in the figure, the resonator R2 of the resonator R1 of receiving terminal and transmitting terminal links to each other with transmission line respectively with capacitor C by inductance L.The transmission line of receiver side and emitting side links to each other with transmitting terminal with receiving terminal respectively.Between these two terminals, be connected with an antenna.This resonator is a ground connection λ/4 dielectric resonators.Therefore, this diplexer filter has played the effect of reflective-mode (reflecting mode) filter.Therefore, the impedance of this resonator will become minimum value at the resonance point place, form passband thus.
Usually, the phase place at transmission line two ends is different.Therefore, must with input, receiving terminal and antenna end each other electric insulation open.In order to realize such electric insulation, the length of transmission line must be λ/4.In other words, if utilize transmission line to form diplexer filter, then the length of transmission line must have certain size.Therefore, the diplexer filter that depends on length of transmission line can not be done very for a short time.
In addition, if in diplexer filter, form the passband of certain width, then will have to use the resonator of a plurality of the above-mentioned types.Yet, when having used a plurality of resonator,, will make the filtering characteristic variation owing to insert the loss increase although the attenuation characteristic of passband outer peripheral areas can make moderate progress.
The object of the invention just is to overcome the above-mentioned defective in the routine techniques.
Therefore an object of the present invention is to provide and a kind ofly wherein two are used for receiving and the resonator that transmits is cascaded in radio communication, make all can improve, realize the diplexer filter of advantages such as volume is little and in light weight simultaneously in attenuation characteristic on the blocking frequency band and the insertion loss on the passband.
In order to realize above-mentioned target, diplexer filter according to the present invention comprises: the input/output terminal that is used for input and output signal; The first filtering portion of the inductance that includes first resonance device that links to each other with this input/output terminal and be in series with this first resonance device; The second filtering portion of the electric capacity that includes second resonance device that is cascaded with this first resonance device and links to each other and be in series with this second resonance device with input/output terminal; And be connected in antenna terminal between the electric capacity of the inductance of the first filtering portion and the second filtering portion.
First and second resonance devices are installed on the printed circuit board (PCB), and are made of first medium block and second medium block.In first and second medium blocks, on whole surface, be coated with electric conducting material except its front surface, extend through the rear surface from its front surface always and be formed with a resonance hole at each medium block respectively, the internal coat in these resonance holes has electric conducting material to form internal electrode.Inductance and electric capacity are electrically connected with the internal electrode of first and second medium blocks respectively.
Alternatively, be coated with electric conducting material on first resonance device and second resonance device the whole surface to form the monolithic dielectric piece except front surface, pass this monolithic dielectric piece and be formed with two resonance holes, and the internal coat in these two resonance holes there is electric conducting material to form internal electrode.At this moment, one on front surface in these two resonance holes is formed with the electrode pattern that is used to regulate resonance frequency on every side, perhaps the rear portion of medium block is cut away with the formation step portion, thereby make two resonance holes have the length that differs from one another.
In another aspect of the present invention, diplexer filter according to the present invention comprises: the input/output terminal that is used for input and output signal; Be one another in series together and first and second resonance devices that link to each other with input/output terminal; One end links to each other and the inductance of other end ground connection with first resonance device; One end links to each other and the electric capacity of other end ground connection with second resonance device; And be connected in antenna terminal between first resonance device and second resonance device.
First and second resonance devices are installed on the printed circuit board (PCB), and are made of first medium block and second medium block.In first and second medium blocks, on whole surface, be coated with electric conducting material except its front surface, extend through the rear surface from its front surface always and be formed with a resonance hole at each medium block respectively, be coated with electric conducting material in the inside in these resonance holes to form internal electrode.Inductance and electric capacity are electrically connected with the internal electrode of first and second medium blocks respectively.The ground electrode that is provided on this inductance and electric capacity and the printed circuit board (PCB) links to each other.
Alternatively, be coated with electric conducting material on first resonance device and second resonance device the whole surface except front surface.First and second resonance devices are integrated in the independent medium block.Pass this monolithic dielectric piece and be formed with two resonance holes, and be coated with electric conducting material to form internal electrode in the inside in these two resonance holes.At this moment, one on front surface in these two resonance holes is formed with the electrode pattern that is used to regulate resonance frequency on every side, perhaps the rear portion of medium block is cut away with the formation step portion, thereby make two resonance holes have the length that differs from one another.
Above-mentioned and other advantage of the present invention will become apparent from the detailed description of next the preferred embodiments of the present invention being done with reference to accompanying drawing, wherein:
Figure 1 shows that the schematic diagram of the equivalent electric circuit of conventional diplexer filter;
Figure 2 shows that schematic diagram as λ/4 coaxial resonators of filter of the present invention;
Figure 3 shows that the schematic diagram of the equivalent electric circuit of coaxial resonator shown in Figure 2;
Figure 4 shows that a kind of schematic diagram and characteristic curve thereof of LC antiresonant circuit;
Figure 5 shows that a kind of schematic diagram and characteristic curve thereof of LC series resonant circuit;
Figure 6 shows that the wherein schematic diagram of λ/4 coaxial resonators and capacitances in series circuit together;
Fig. 7 A is depicted as the schematic diagram of the equivalent electric circuit of circuit shown in Figure 6;
Fig. 7 B is depicted as the characteristic schematic diagram of the equivalent electric circuit shown in Fig. 7 A;
Figure 8 shows that the schematic diagram of the circuit that λ/4 coaxial resonators wherein and inductance are cascaded;
Fig. 9 A is depicted as the schematic diagram of the equivalent electric circuit of circuit shown in Figure 8;
Fig. 9 B is depicted as the characteristic schematic diagram of the equivalent electric circuit shown in Fig. 9 A;
Figure 10 shows that schematic diagram according to the equivalent electric circuit of diplexer filter of the present invention;
Figure 11 shows that schematic diagram according to the another kind of equivalent electric circuit of diplexer filter of the present invention;
Figure 12 shows that the characteristic schematic diagram of the equivalent electric circuit of diplexer filter shown in Figure 10;
Figure 13 A is depicted as the schematic diagram according to the another kind of embodiment of diplexer filter of the present invention;
Figure 13 B is depicted as the schematic diagram of the circuit board that the dielectric filter shown in Figure 13 A is mounted thereon;
Figure 14 A is depicted as the schematic diagram according to another embodiment of diplexer filter of the present invention;
Figure 14 B is depicted as the schematic diagram of the circuit board that the dielectric filter shown in Figure 14 A is mounted thereon;
Figure 15 shows that schematic diagram according to another embodiment of diplexer filter of the present invention;
Figure 16 A is depicted as the schematic diagram according to another embodiment of diplexer filter of the present invention;
Figure 16 B is depicted as the schematic diagram of the circuit board that the dielectric filter shown in Figure 16 A is mounted thereon;
Filter of the present invention is a kind of dielectric resonator as shown in Figure 2.This resonator comprises medium block 36, and medium block 36 is coated with electric conducting material on the whole surface except its front surface 34, and medium block 36 is parallelepipeds.Run through medium block 36 from front surface 34 and be formed with a resonance hole 35, and electric conducting material is arranged in the internal coat in resonance hole 35.
This resonator is a kind of λ/4 resonators, exercises different functions according to different frequencies.The advantage of this resonator is: promptly, this kind resonator self has the electrical length (electrical length) of λ/4, therefore if be applied to diplexer filter, the receiving terminal of diplexer filter then, transmitting terminal and antenna terminal be mutually insulated naturally.Simultaneously, can come electrical length λ/4 of the resonator that constitutes this medium block are regulated as on medium block, forming methods such as electrode pattern with multiple diverse ways.Therefore, even when the size of medium block has reduced, also can be by forming the electrical length that electrode pattern forms λ/4.Therefore, when being applied to filter, the overall volume of filter is greatly reduced.
Figure 3 shows that the schematic diagram of the equivalent electric circuit of λ shown in Figure 2/4 coaxial resonators.As shown in the figure, if frequency f be higher than resonance frequency f0 (f＞f0), then resonator will play the effect of electric capacity, and if frequency f equals resonance frequency f0 (f=f0), then resonator will play the effect of LC antiresonant circuit.(f＜f0), then resonator will play the effect of inductance if frequency f is lower than resonance frequency f0.
Meanwhile, Fig. 4 and the schematic diagram and the characteristic curve thereof that Figure 5 shows that LC parallel connection and series resonant circuit.At first in the LC antiresonant circuit shown in Fig. 4 A, gain becomes minimum value at resonance frequency f0 place, demonstrates the logical frequency characteristic shown in Fig. 4 B.And simultaneously, in the LC series resonant circuit shown in Fig. 5 A and the 5B, gain becomes maximum at resonance frequency f0 place, demonstrates reflection characteristic.
Figure 6 shows that the schematic diagram of the circuit that wherein λ/4 coaxial resonators and electric capacity are in series.Fig. 7 A is depicted as the equivalent electric circuit of circuit shown in Figure 6.Fig. 7 B is depicted as the characteristic schematic diagram of the equivalent electric circuit of Fig. 7 A.When frequency f equaled resonance frequency f0 (f=f0), λ/4 resonators constituted LC antiresonant circuit as shown in Figure 3.Therefore, equivalent electric circuit is equivalent to shown in Fig. 7 A LC antiresonant circuit and capacitor C is cascaded.On the other hand, (during f＜f0), resonator will play the effect of inductance L, and therefore, its equivalent electric circuit is equivalent to inductance L and capacitor C are cascaded when frequency f is lower than resonance frequency f0.Therefore, gain will become minimum value at resonance frequency f0 place, and gain is being lower than certain characteristic frequency f0 of resonance frequency f0
sThe place will become maximum, obtain the characteristic curve shown in Fig. 7 B thus.
When λ/when 4 resonator R were in series with inductance L as shown in Figure 8, its concrete condition was as follows.That is, shown in Fig. 9 A, when frequency f equals resonance frequency f0, equivalent electric circuit is equivalent to LC antiresonant circuit and inductance L is cascaded, and when frequency f is higher than resonance frequency f0, resonator will play the effect of electric capacity, therefore, capacitor C and inductance L are cascaded.Therefore, gain will become minimum value at resonance frequency f0 place, and be higher than certain characteristic frequency f0 of resonance frequency f0
sLast gain will become maximum, will obtain the characteristic curve shown in Fig. 9 B thus.
Among the present invention, two resonators are cascaded to form a diplexer filter according to above-mentioned principle.That is, it forms this diplexer filter with two resonators, a pellet inductor and a flaky electric capacity.This duplexer dielectric filter is a kind of logical frequency pattern dielectric filter, will become minimum value in the impedance of resonance point place resonator.In having used this kind diplexer filter of a plurality of resonators, can only utilize to receive resonator and launch resonator to form required frequency band.Therefore, it can realize advantages such as microminiaturized and in light weight, and can minimize the insertion loss simultaneously.
Figure 10 and 11 is depicted as a kind of embodiment based on above-mentioned principle.Usually, in the diplexer filter with two resonators, if one of them resonator is a receiving terminal, then another resonator is a transmitting terminal.Unfixing receiving terminal and the transmitting terminal set in duplexer dielectric filter.According to the structure and the applied product of duplexer dielectric filter, receiving terminal and transmitting terminal can exchange.That is, these two resonators can receive also and can transmit.Yet, in the process that present embodiment is described, will suppose that receiving terminal and transmitting terminal all are determined.Yet this should not become limitation of the scope of the invention.
As shown in figure 10, in the first embodiment of the present invention, resonator R1 and R2 promptly receive resonator R1 and emission resonator R2 is connected on together, and therefore, the impedance on the resonance point will become infinity, thereby form the blocking district.Therefore, the resonance frequency that receives resonator R1 will equal the average frequency of the passband of transmitting terminal, and the resonance frequency of emission resonator R2 will form resonance point on the average frequency of the passband of receiving terminal.
Dielectric resonator R1 and R2 are the λ/4 wavelength coaxial resonators of the open circuit of the end closure other end wherein.At receiving terminal, be in series with an inductance on the dielectric resonator R1, therefore, shown in Fig. 9 A, this resonator will play the effect of electric capacity, and consequently the effect of resonator R1 and inductance L just likes the LC series resonant circuit.Therefore, maximum gain appears on the frequency that is higher than resonance frequency.Consequently, frequency acceptance band is formed on the frequency that is higher than resonance frequency.In the case, by regulating the inductance value of inductance L, just can regulate so that resonance point is corresponding with the receiving terminal frequency band resonance point.
In an identical manner, emission resonator R2 will play the effect of inductance L, and therefore, resonator R2 has formed the LC series resonant circuit with capacitor C.Therefore, maximum gain appears on the frequency that is lower than resonance frequency, and consequently, emission band is formed on the frequency that is lower than resonance frequency.Therefore, by the capacitive reactance of control capacittance C, just can make resonance point corresponding with the transmitting terminal frequency band.
It is for the ease of describing that the type of resonator is confined to λ/4 resonators.For a person skilled in the art, it should be understood that and can use the resonator of other type except λ/4 resonators to realize filter of the present invention equally.
Figure 12 shows that the characteristic schematic diagram of the equivalent electric circuit of diplexer filter shown in Figure 10.As shown in the figure, receive resonator R1 and be respectively 2.0GHz and 2.185GHz with the frequency of launching resonator R2.Although among the figure and not shown, because the effect of the LC series resonant circuit of being determined by L and C parameter value resonator R1 and R2 will form a curve from the high frequency attenuation to the low frequency at receiving terminal.Meanwhile, at transmitting terminal, the curve from the low cut to the high frequency will be formed.Because by reception resonator R1 and the formed characteristic curve of emission resonator R2, and by the formed characteristic curve of LC series resonant circuit, the characteristic curve of receiving terminal and transmitting terminal as shown in the figure.
Referring to Figure 12, in the curve of the receiving terminal of this duplexer, decay comes across low frequency one side, does not then almost decay in the high frequency-side of passing resonance frequency.Referring to the characteristic curve of transmitting terminal, decay occurs in high frequency one side, does not then almost decay in low frequency one side of passing resonance frequency.That is, its passband that has formed a kind of wherein receiving terminal is higher than the duplexer dielectric filter of the passband of transmitting terminal.
The receiving terminal as shown in figure 12 and the passband of transmitting terminal do not show its upper bound and lower bound.Because the diplexer filter of this bidirectional filter type is wanted to carry out filtering at receiving terminal and transmitting terminal simultaneously, so its most serious problem is the interference phenomenon that appears on reception area and the emitter region.As shown in figure 12, the most important effect of diplexer filter of the present invention is to determine the lower bound of reception area and the upper bound of emitter region, thereby makes and can not disturb between reception area and emitter region.In this duplexer, the zone of certain characteristic frequency above and below will become reception area and emitter region.When using diplexer filter of the present invention, the upper bound of reception area and emitter region and lower bound are not determined by diplexer filter self.When signal when the outside is imported into, at first diplexer filter will carry out filtering to these signals and be higher than the frequency of certain characteristic frequency (reception area starting point) with reception, and the signal suppressing that is higher than the frequency of required frequency band subsequently in other component with signal after the filtering is fallen.So will receive only the signal of a certain special frequency band at last.When transmitting, will carry out filtering with same mechanism equally.
Figure 11 shows that second embodiment according to diplexer filter of the present invention.In this embodiment, receive resonator R1 and directly link to each other with output with input respectively, and be one another in series together with emission resonator R2.Between receiving terminal and reception resonator R1, be connected with an inductance L, wherein the other end of this inductance is grounded.Between transmitting terminal and emission resonator R2, then be connected with a capacitor C, wherein the other end of this electric capacity also is grounded.Can regulate this kind matching relationship thus.Although all be to connect inductance and electric capacity in the above described manner shown in the accompanying drawing, electric capacity can be connected in fact equally between antenna and the emission resonator R2, and inductance is connected between antenna and the reception resonator R1.In addition, this electric capacity and inductance also can be distinguished directly and link to each other with emission resonator R2 and reception resonator R1.In other words, the effect of capacitor C and inductance L only is to mate in order to realize, so its tie point can be on any position.
An end of transmission line is by in the λ of short circuit/4 resonators therein, and the impedance at the resonance frequency place is infinitely great, and impedance then is zero on corresponding to the frequency of the twice of resonance frequency.Therefore, with the corresponding frequency of the twice of resonance frequency on the insertion loss with minimum.Yet transmitting terminal is compared very little with the frequency-splitting between the receiving terminal with resonance frequency usually.Therefore, infinite-impedance point and zero or the minimum impedance point should be formed on the position that is approximately difference on the frequency between transmitting terminal and the receiving terminal.
For realizing this requirement, electric capacity and inductance are connected together to realize impedance matching.For receiving terminal, the resonator that utilizes emission band is guaranteed the blocking characteristic, and be connected with an inductance to be higher than impedance smallest point of formation on the emission band of resonance frequency band.Therefore just formed and wherein inserted the reception passband that loss is minimized.Meanwhile,, the resonator that utilizes frequency acceptance band is guaranteed the blocking characteristic, and be connected with an electric capacity on the emission band of the emission band that is lower than receiving terminal, to form an impedance smallest point for transmitting terminal.Thereby formed the emission passband.
Now with reference to accompanying drawing the actual diplexer filter based on above-mentioned equivalent electric circuit is described.
Figure 13 A is depicted as another embodiment according to diplexer filter of the present invention.Figure 13 B is depicted as the printed circuit board (PCB) that the diplexer filter shown in Figure 13 A is mounted thereon.As shown in FIG. 13A, this diplexer filter is a kind of filter of type of separation.Receive resonator 1 and launch resonator 2 and be installed on the printed circuit board (PCB) 9.Each resonator all is parallelepiped medium blocks, and is coated with electric conducting material on the whole surface of this medium block except open-circuit surface (front surface) 4.This medium block is run through in resonance hole 5, although also not shown in the accompanying drawing, also is coated with electric conducting material in the inside in resonance hole 5 to form internal electrode.
The internal electrode that receives the resonance hole of resonator 1 is electrically connected with the inductance 7 that is installed on the printed circuit board (PCB) 9.The internal electrode in the resonance hole of emission resonator 2 then is electrically connected with the electric capacity 8 that is installed on the printed circuit board (PCB) 9.Therefore will realize equivalent electric circuit as shown in figure 10.Inductance 7 and electric capacity 8 are electrically connected each other.
Shown in Figure 13 B, receive resonator 1 and be mounted respectively on the conduction region 10 of printed circuit board (PCB) 9, and link to each other with output with input respectively by conduction region 10 with emission resonator 2.Antenna is linked on the conduction region 10 to be electrically connected with inductance 7 and electric capacity 8.
Figure 14 A is depicted as another embodiment according to duplexer dielectric filter of the present invention.Figure 14 B is depicted as the circuit board that the diplexer filter shown in Figure 14 A is mounted thereon.In this embodiment, this filter is the integral type diplexer filter.
Shown in Figure 14 A, parallelepiped medium block 11 is installed on the printed circuit board (PCB) 19, is formed with two resonance holes 15 and pass this medium block 11.Medium block 11 is coated with electric conducting material on the whole surface except front surface (open-circuit surface) 14, forms outer electrode by it.The inside in resonance hole 15 also is coated with electric conducting material to form internal electrode.Be formed with circuitous pattern 16 around one of resonance hole 15 on open-circuit surface 14, figure 16 then links to each other with the internal electrode in resonance hole 15.In addition, be installed on the circuit board 19 such as the passive component of pellet inductor 17 and flaky electric capacity 18 and link to each other with internal electrode with resonance hole 15.Pellet inductor 17 and flaky electric capacity 18 connect together each other by conduction region 20.
Figure 15 shows that schematic diagram according to another embodiment of diplexer filter of the present invention.In this embodiment, be that a part with medium block 21 cuts forming step portion 26, rather than on open-circuit surface 24, form electrode pattern.In this way, can regulate so that resonance frequency is controlled the length in resonance hole.In addition, the structure of this embodiment is identical with the structure of the embodiment shown in Figure 14 A.
Figure 16 A and 16B are depicted as the schematic diagram according to another embodiment of duplexer dielectric filter of the present invention.Shown in Figure 16 A, receive resonator 31 and be mounted respectively on the conduction region 40 that is formed on the circuit board 39 with emission resonator 32.Resonator 31 links to each other with inductance 38 with electric capacity 37 respectively by conduction region 40 with 32.The internal electrode in resonator 31 and 32 resonance hole be formed at the conduction region that receives between resonator 31 and the emission resonator 32 and link to each other.Therefore, receiving resonator 31 and emission resonator 32 and antenna is electrically connected.
With linking to each other with the earth terminal 42 of circuit board 39 with inductance 38 with the electric capacity 37 that emission resonator 32 links to each other with reception resonator 31 respectively, to form equivalent electric circuit shown in Figure 1.
In the embodiment shown in Figure 10,11,14,15 and 16, electric capacity and inductance are flaky electric capacity and pellet inductor mostly.Yet except using flaky electric capacity, it can also use the parasitic capacitance between the conduction region that is formed at circuit board.In this way, can reduce the number of required element, and further reduce the shared area of element thus.Therefore, it can reduce the volume of filter, and reduces its cost.
In the above description, each resonator all is represented as and receives resonator and emission resonator, but this only is for the ease of describing, and it should not have any restriction to scope of the present invention.In addition, resonator is described to λ/4 resonators of being made of the parallelepiped medium block.This is also for the needs of being convenient to describe, and therefore, it also can use the resonator of other type.
Therefore, scope of the present invention should not be limited to above-mentioned specific embodiment, and should only be limited by additional claim.
According to aforesaid the present invention, duplexer dielectric filter of the present invention is designed to be cascaded and have the diplexer filter of simple equivalent circuit with formation receiving resonator and emission resonator.Therefore, attenuation characteristic on the blocking frequency band and the insertion loss on the passband all can improve, and can realize the little and lightweight advantage of volume simultaneously.
Claims (17)
1. diplexer filter that is used for radio communication is characterized in that comprising:
The input/output terminal that is used for input and output signal;
First filter unit of the inductance that contains first resonance device that links to each other with described input/output terminal and be in series with described first resonance device;
Second filter unit of the electric capacity that contains second resonance device that links to each other with described input/output terminal and be in series with described second resonance device, described second resonance device and described first resonance device connect together;
Be connected in the antenna terminal between the described electric capacity of the described inductance of described first filter unit and described second filter unit.
2. diplexer filter as claimed in claim 1, it is characterized in that described first and second resonance devices are installed on the printed circuit board (PCB), and make by first medium block and second medium block, described first and second medium blocks are coated with electric conducting material on the whole surface except its front surface; The rear surface that extends through each medium block from described front surface is formed with a resonance hole respectively; The internal coat in described resonance hole has electric conducting material to form internal electrode.
3. diplexer filter as claimed in claim 1 is characterized in that described first and second resonance devices are integrated in the independent medium block; Described medium block is coated with electric conducting material on the whole surface except its front surface; The rear surface that extends through this medium block from described front surface is formed with two resonance holes abreast; The internal coat in described resonance hole has electric conducting material to form internal electrode.
4. diplexer filter as claimed in claim 3, it is characterized in that described two resonance holes at least one around be formed with electrode pattern so that resonance frequency is regulated.
5. diplexer filter as claimed in claim 3 is characterized in that the aft section of described medium block is cut off a part to form a step portion, so that the length in described two resonance holes is different each other.
6. diplexer filter as claimed in claim 2 is characterized in that described electric capacity is flaky electric capacity.
7. diplexer filter as claimed in claim 2, the capacitive reactance that it is characterized in that described electric capacity is the parasitic capacitance that is formed on the described printed circuit board (PCB).
8. diplexer filter as claimed in claim 2 is characterized in that described inductance is a pellet inductor.
9. diplexer filter that is used for radio communication is characterized in that comprising:
The input/output terminal that is used for input and output signal;
First resonance device that links to each other with described input/output terminal;
Second resonance device of connecting with described first resonance device;
The one end links to each other and the inductance of other end ground connection with described first resonance device;
The one end links to each other and the electric capacity of other end ground connection with described second resonance device;
Be connected in the antenna terminal between described first resonance device and described second resonance device.
10. diplexer filter as claimed in claim 9 is characterized in that described first and second resonance devices are installed on the printed circuit board (PCB), and is made of first medium block and second medium block; Described first and second medium blocks are coated with electric conducting material on the whole surface except its front surface; The rear surface that extends through each medium block from described front surface is formed with a resonance hole respectively; The internal coat in described resonance hole has electric conducting material to form internal electrode.
11. diplexer filter as claimed in claim 10 is characterized in that described inductance all links to each other with the ground electrode of described printed circuit board (PCB) with electric capacity.
12. diplexer filter as claimed in claim 9 is characterized in that described first and second resonance devices are integrated in the independent medium block; Described medium block is coated with electric conducting material on the whole surface except its front surface; The rear surface that extends through this medium block from described front surface is formed with two resonance holes abreast; The internal coat in described resonance hole has electric conducting material to form internal electrode.
13. diplexer filter as claimed in claim 12, it is characterized in that in described two resonance holes one around be formed with electrode pattern so that resonance frequency is regulated.
14. diplexer filter as claimed in claim 12 is characterized in that the aft section of described medium block is cut off a part to form a step portion, so that the length in described two resonance holes is different each other.
15. diplexer filter as claimed in claim 10 is characterized in that described electric capacity is flaky electric capacity.
16. diplexer filter as claimed in claim 10, the capacitive reactance that it is characterized in that described electric capacity is the parasitic capacitance that is formed on the described printed circuit board (PCB).
17. diplexer filter as claimed in claim 10 is characterized in that described inductance is a pellet inductor.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US10690098P | 1998-11-03 | 1998-11-03 | |
| US60/106900 | 1998-11-03 | ||
| KR1019980050499A KR20000033584A (en) | 1998-11-24 | 1998-11-24 | Duplex dielectric filter |
| KR50499/1998 | 1998-11-24 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1262534A true CN1262534A (en) | 2000-08-09 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 99111281 Pending CN1262534A (en) | 1998-11-03 | 1999-08-05 | Duplexer wave filter |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP2000151213A (en) |
| CN (1) | CN1262534A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101471168B (en) * | 2007-12-27 | 2011-06-29 | 奥雷通光通讯设备（上海）有限公司 | Installation method for inductor of duplexer |
| CN112563696A (en) * | 2020-11-30 | 2021-03-26 | 江苏灿勤科技股份有限公司 | Low-frequency dielectric filter and method for manufacturing low-frequency dielectric filter |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2008004557A1 (en) | 2006-07-03 | 2008-01-10 | Hitachi Metals, Ltd. | Branch circuit, high frequency circuit and high frequency module |
| KR100838244B1 (en) | 2007-06-22 | 2008-06-17 | 삼성전기주식회사 | Electromagnetic bandgap structure and printed circuit board |
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1999
- 1999-08-05 CN CN 99111281 patent/CN1262534A/en active Pending
- 1999-09-17 JP JP11264391A patent/JP2000151213A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101471168B (en) * | 2007-12-27 | 2011-06-29 | 奥雷通光通讯设备（上海）有限公司 | Installation method for inductor of duplexer |
| CN112563696A (en) * | 2020-11-30 | 2021-03-26 | 江苏灿勤科技股份有限公司 | Low-frequency dielectric filter and method for manufacturing low-frequency dielectric filter |
| CN112563696B (en) * | 2020-11-30 | 2024-05-14 | 江苏灿勤科技股份有限公司 | Low-frequency dielectric filter and method for manufacturing same |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2000151213A (en) | 2000-05-30 |
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