CN109818595A - A kind of bandstop filter and communication equipment - Google Patents
A kind of bandstop filter and communication equipment Download PDFInfo
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- CN109818595A CN109818595A CN201811524736.3A CN201811524736A CN109818595A CN 109818595 A CN109818595 A CN 109818595A CN 201811524736 A CN201811524736 A CN 201811524736A CN 109818595 A CN109818595 A CN 109818595A
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Abstract
The present invention provides a kind of bandstop filter and communication equipment, has a low insertion loss, high stop band bandwidth, height roll-off along the advantages of.The bandstop filter includes the first T-type resonator element, the second T-type resonator element and is connected to the match circuit to match between the first T-type resonator element and the second T-type resonator element for realizing two resonator elements；The first T-type resonator element is made of identical first piezo-electric resonator of three resonance frequencies, the second T-type resonator element is made of identical second piezo-electric resonator of three resonance frequencies, and the match circuit includes inductance, capacitor, series resonator, parallel resonator or by one of inductance L and capacitor C resonance circuit formed.
Description
Technical field
The present invention relates to communications with class devices field is filtered, particularly a kind of band made using piezoelectric effect principle
Hinder filter and communication equipment.
Background technique
With the development of mobile communication, the utilization rate that the frequency spectrum resource for mobile communication distributes is higher and higher, with
Definition of the newest 3GPP for communications band, commercial communication has covered 4GHz substantially hereinafter, more than totally four ten frequency ranges.With
2400~2484.5MHz in Industrial-Scientific-medicine ISM band, at the same also with WLAN frequency range weight common in life
It is folded, and the mobile communication frequency range closed on, such as Band 40 (2300MHz~2400MHz), Band 41 (2496MHz~
2690MHZ), Band 7 send frequency range (2500MHz~2570MHz), Band 1 receive frequency range (2110MHz~2170MHz) it
Between frequency interval it is very close, and in certain application scenarios, these frequency ranges all share an antenna, need through a band resistance
Filter or antenna frequency divider, the signal of WLAN and the radiofrequency signal of other mobile communication are separated.
Current existing technology is usually used low-temperature co-fired ceramics (LTCC), or other common integration techniques, designs this band
Filter is hindered, but since the resonance circuit Q value of such technology is low, usually only tens, the bandstop filter being made into is in passband
Interior Insertion Loss is poor, and the intermediate zone of passband and stopband is wider, is unable to satisfy compartment away from closer two groups of radiofrequency signals.
Resonator based on piezoelectric principle specifically includes that FBAR (Film Bulk Acoustic Resonator, thin-film body
Acoustic resonator), SMR (Solidly Mounted Resonator, solid-state assemble resonator) and SAW (Surface
Acoustic Wave, SAW resonator).Piezo-electric resonator compares the resonance circuit of ordinary passive device composition, has Q
Value is high, technical advantage small in size, especially by piezo-electric resonator and the compound filtering device formed of ordinary passive device, usually
With the advantages of Q value height, insertion loss is low, and height roll-offs.But since piezo-electric resonator is narrowband device, electromechanical coupling factor one
As between 3%~7%, lead to the 2.4GHz bandstop filter designed with usual method, resistance band can only approach
20MHz is not able to satisfy actual demand.
Therefore, a kind of low insertion loss how is designed, high stop band bandwidth, the bandstop filter on high edge of roll-offing, is still urgently
The technical issues of solution.
Summary of the invention
In view of this, the present invention provides a kind of bandstop filter and communication equipment, there is low insertion loss, high stop band band
Width, height roll-off along the advantages of.
The first object of the present invention is to provide a kind of bandstop filter, which includes the first T-type resonator list
Member, the second T-type resonator element and be connected between the first T-type resonator element and the second T-type resonator element for realizing
The match circuit that two resonator elements match；Wherein:
The first T-type resonator element is made of identical first piezo-electric resonator of three resonance frequencies, wherein two
First piezo-electric resonator passes through inductance connection to two input ports respectively, and two the first piezo-electric resonators are also respectively with other one
A first piezo-electric resonator connection, another first piezo-electric resonator are connected to match circuit.
The second T-type resonator element is made of identical second piezo-electric resonator of three resonance frequencies, wherein two
Second piezo-electric resonator passes through inductance connection to two output ports respectively, and two the second piezo-electric resonators are also respectively with other one
A second piezo-electric resonator connection, another second piezo-electric resonator are connected to match circuit.
The resonance frequency of first piezo-electric resonator and the second piezo-electric resonator is same or different.
The match circuit includes inductance, capacitor, series resonator, parallel resonator or inductance L and capacitor C by parallel connection
One of resonance circuit of composition.
The second object of the present invention is to provide a kind of communication equipment, which includes bandstop filter as described above
And receiver；The bandstop filter is for selecting the signal transmitting and receiving of the receiver.
The present invention use two T-type resonator elements, realize the matched well of front stage, with reach wider passband and
Lower pass band insertion loss improves stopband and inhibits broadband, has preferable pass-band performance and roll-off characteristic, realizes better
Selecting frequency characteristic.
Detailed description of the invention
Attached drawing for a better understanding of the present invention, does not constitute an undue limitation on the present invention.Wherein:
Fig. 1 is the circuit diagram of one bandstop filter of embodiment；
Fig. 2 a is the broadband amplitude-frequency response figure of one bandstop filter of embodiment；
Fig. 2 b is the narrowband amplitude-frequency response figure of one bandstop filter of embodiment；
Fig. 3 a is the broadband amplitude-frequency response figure of the single T-type resonator element of one bandstop filter of embodiment；
Fig. 3 b is the narrowband amplitude-frequency response figure of the single T-type resonator element of one bandstop filter of embodiment；
Fig. 4 is the circuit diagram of two bandstop filter of embodiment；
Fig. 5 a is the broadband amplitude-frequency response figure of two bandstop filter of embodiment；
Fig. 5 b is the narrowband amplitude-frequency response figure of two bandstop filter of embodiment；
Fig. 6 is the circuit diagram of three bandstop filter of embodiment；
Fig. 7 is the circuit diagram of example IV bandstop filter；
Fig. 8 is the circuit diagram of five bandstop filter of embodiment.
Specific embodiment
The invention will be further described with embodiment with reference to the accompanying drawing.
Embodiment one
Fig. 1 shows the circuit structure of one bandstop filter of the present embodiment.As shown in Figure 1, the bandstop filter include by
The first T-type resonator element T1 of piezo-electric resonator T1-1, piezo-electric resonator T1-2 and piezo-electric resonator T1-3 composition, by piezoelectricity
The second T-type resonator element T2 of resonator T2-1, piezo-electric resonator T2-2 and piezo-electric resonator T2-3 composition, and be connected to
Match circuit CN between first T-type resonator element T1 and the second T-type resonator element T2.
Specifically, the piezo-electric resonator T1-1 is connected to input port IN+, the piezo-electric resonator by inductance L1
T1-3 is connected to input port IN- by inductance L2；The piezo-electric resonator T1-1 and piezo-electric resonator T1-3 also respectively with pressure
Electrical resonator T1-2 connection, the piezo-electric resonator T1-2 are connected to match circuit CN.Piezo-electric resonator T1-1, piezo-electric resonator
T1-2 and piezo-electric resonator T1-3 has identical resonance frequency；Piezo-electric resonator T1-1, piezo-electric resonator T1-2 and pressure
The area ratio of electrical resonator T1-3 is 1:2:8.
The piezo-electric resonator T2-1 is connected to output port OUT+ by inductance L3；The piezo-electric resonator T2-3 passes through
Inductance L4 be connected to output port OUT-, the piezo-electric resonator T2-1 and piezo-electric resonator T2-3 also respectively with piezo-electric resonator
T2-2 connection, the piezo-electric resonator T2-2 are connected to match circuit CN.Piezo-electric resonator T2-1, piezo-electric resonator T2-2 and pressure
Electrical resonator T2-3 has identical resonance frequency；Piezo-electric resonator T2-1, piezo-electric resonator T2-2 and piezo-electric resonator
The area ratio of T2-3 is 1:1:8.
In the present embodiment, the input port IN+, input port IN-, output port OUT+ and output port OUT- points
It is not single-ended 50 ohmage, the prevention at radio-frequency port of 100 ohmage of difference.
In the present embodiment, the effect of the match circuit CN is to realize that the first T-type resonator element T1 and the second T-type are humorous
The matched well of vibration device unit T2, to reach wider passband and lower pass band insertion loss, while match circuit CN root
According to the impedance of itself and T-type resonator element, bandwidth of rejection can be improved to a certain extent.It is described in the present embodiment
Inductance, inductance value 3.3nH can be used in match circuit CN.
In the present embodiment, piezoelectric resonator all in the first T-type resonator element T1 and the second T-type resonator element T2
Device resonance frequency having the same.
In the present embodiment, discrete inductance element can be used in inductance L1-L4, can also be using integrated in ltcc substrate
Passive device (IPD).When inductance L1-L4 uses discrete inductance element, the inductance value of inductance L1 and L3 are 2.8nH, inductance L2
Inductance value with L4 is 5.7nH.
Two input ports and two output ports in Fig. 1, when one of endpoint is as signal end, another conduct
Signal reflux end, may be designed in the bandstop filter of single port (un-balanced).
Fig. 2 a is the broadband amplitude-frequency response figure of one bandstop filter of embodiment, bandstop filter 1.5GHz~
Passband of the 2.2GHz for low frequency side, insertion loss average out to -2dB, the Insertion Loss at 1.5GHz are worst for -4.584dB.Band resistance
Filter is in the passband that 2.5GHz~3.5GHz is high frequency side, insertion loss average out to -2.5dB, the Insertion Loss at 2.5GHz
Worst is -2.889dB.
Fig. 2 b is the narrowband amplitude-frequency response figure of one bandstop filter of embodiment, is inhibited to require with 30dB as reference, left
The stopband frequency point of side is 2.388GHz, and the stopband frequency point on right side is 2.432GHz, and it is 44MHz that 30dB stopband, which inhibits bandwidth, than existing
There is technology compared to wider.Also, bandstop filter 2.5GHz passband to the stopband of 2.432GHz, roll-off and only used 68MHz,
With the characteristic that height roll-offs, better selecting frequency characteristic may be implemented.
Fig. 3 a is the independent amplitude-frequency response figure of the first T-type resonator element T1 in embodiment one, and frequency range is width
Band, Fig. 3 b are the narrowband amplitude-frequency response figures of the first T-type resonator element T1 in embodiment one.It can see from Fig. 3 b, such as
Fruit is suppressed to reference (half that 15dB is 30dB) with 15dB's, and the stopband frequency point in the left side of single T-type resonator element is
2.391GHz, the stopband frequency point on right side are 2.429GHz, bandwidth of rejection 38MHz.
When two T-type resonator elements, after being linked together by intermediate inductance L, L plays impedance matching incessantly
Effect, while also inhibiting bandwidth to be increased to 44MHz by theoretical 38MHz stopband, 15.8% is improved, is roll-offed meeting height
While expanded stopband inhibit bandwidth.
Embodiment two
Fig. 4 shows the circuit structure of two bandstop filter of the present embodiment.As shown in figure 4, the bandstop filter include by
The first T-type resonator element T1 of piezo-electric resonator T1-1, piezo-electric resonator T1-2 and piezo-electric resonator T1-3 composition, by piezoelectricity
The second T-type resonator element T2 of resonator T2-1, piezo-electric resonator T2-2 and piezo-electric resonator T2-3 composition, and be connected to
Matching inductance L between first T-type resonator element T1 and the second T-type resonator element T2.
Specifically, the piezo-electric resonator T1-1 is connected to input port IN+, the piezo-electric resonator by inductance L1
T1-3 is connected to input port IN- by inductance L2；The piezo-electric resonator T1-1 and piezo-electric resonator T1-3 also respectively with pressure
Electrical resonator T1-2 connection, the piezo-electric resonator T1-2 are connected to matching inductance L.Piezo-electric resonator T1-1, piezo-electric resonator
T1-2 and piezo-electric resonator T1-3 has identical resonance frequency；Piezo-electric resonator T1-1, piezo-electric resonator T1-2 and pressure
The area ratio of electrical resonator T1-3 is 1:2:8.
The piezo-electric resonator T2-1 is connected to output port OUT+ by inductance L3；The piezo-electric resonator T2-3 passes through
Inductance L4 be connected to output port OUT-, the piezo-electric resonator T2-1 and piezo-electric resonator T2-3 also respectively with piezo-electric resonator
T2-2 connection, the piezo-electric resonator T2-2 are connected to matching inductance L.Piezo-electric resonator T2-1, piezo-electric resonator T2-2 and pressure
Electrical resonator T2-3 has identical resonance frequency；Piezo-electric resonator T2-1, piezo-electric resonator T2-2 and piezo-electric resonator
The area ratio of T2-3 is 1:1:8.
In the present embodiment, the input port IN+, input port IN-, output port OUT+ and output port OUT- points
It is not single-ended 50 ohmage, the prevention at radio-frequency port of 100 ohmage of difference.
In the present embodiment, the effect of the matching inductance L is to realize that the first T-type resonator element T1 and the second T-type are humorous
Shake the matched well of device unit T2, to reach wider passband and lower pass band insertion loss, while matching inductance L according to
The impedance of itself and T-type resonator element can improve bandwidth of rejection to a certain extent.
In the present embodiment, the resonance frequency of all piezo-electric resonators and the second T-type are humorous in the first T-type resonator element T1
The resonance frequency of all piezo-electric resonators is different in vibration device unit T2.All piezoelectricity is humorous in second T-type resonator element T2
Shake resonance frequency about low 8MHz of the device compared to all piezo-electric resonators in the first T-type resonator element T1, this can be by the
Mass loading is added to realize in two T-type resonator element T2 on all piezo-electric resonators.
Two input ports and two output ports in Fig. 4, when one of endpoint is as signal end, another conduct
Signal reflux end, may be designed in the bandstop filter of single port (un-balanced).
Fig. 5 a is the independent amplitude-frequency response figure of the first T-type resonator element T1 in embodiment two, and frequency range is width
Band, Fig. 5 b are the narrowband amplitude-frequency response figures of the first T-type resonator element T1 in embodiment one.It can see from Fig. 5 b, such as
Fruit is suppressed to reference (half that 15dB is 30dB) with 15dB's, and the stopband frequency point in the left side of single T-type resonator element is
2.391GHz, the stopband frequency point on right side are 2.429GHz, bandwidth of rejection 38MHz.
Since two T-type networks have difference on the frequency, stopband has a staggered effect in frequency, is formed similar in Fig. 5 b
Shape heave a spike that is, in the centre of stopband, while the bandwidth of stopband is further increased to by original 44MHz
50MHz improves 13.6%, maintains preferable pass-band performance and roll-off characteristic.Although inhibiting to omit in 2.43GHz stopband
There is variation, but in the range of entire 50MHz, still can achieve the inhibition of 30dB or more.
Embodiment three
Fig. 6 shows the circuit structure of three bandstop filter of the present embodiment.As shown in fig. 6, the bandstop filter include by
The first T-type resonator element T1 of piezo-electric resonator T1-1, piezo-electric resonator T1-2 and piezo-electric resonator T1-3 composition, by piezoelectricity
The second T-type resonator element T2 of resonator T2-1, piezo-electric resonator T2-2 and piezo-electric resonator T2-3 composition, and be connected to
Between first T-type resonator element T1 and the second T-type resonator element T2 for realizing the first T-type resonator element T1 and
The series resonator RES of the matched well of two T-type resonator element T2.
Specifically, the piezo-electric resonator T1-1 is connected to input port IN+, the piezo-electric resonator by inductance L1
T1-3 is connected to input port IN- by inductance L2；The piezo-electric resonator T1-1 and piezo-electric resonator T1-3 also respectively with pressure
Electrical resonator T1-2 connection, the piezo-electric resonator T1-2 are connected to series resonator RES.Piezo-electric resonator T1-1, piezoelectricity are humorous
The device T1-2 and piezo-electric resonator T1-3 that shakes has identical resonance frequency.
The piezo-electric resonator T2-1 is connected to output port OUT+ by inductance L3；The piezo-electric resonator T2-3 passes through
Inductance L4 be connected to output port OUT-, the piezo-electric resonator T2-1 and piezo-electric resonator T2-3 also respectively with piezo-electric resonator
T2-2 connection, the piezo-electric resonator T2-2 are connected to series resonator RES.Piezo-electric resonator T2-1, piezo-electric resonator T2-2
There is identical resonance frequency with piezo-electric resonator T2-3.
In the present embodiment, the input port IN+, input port IN-, output port OUT+ and output port OUT- points
It is not single-ended 50 ohmage, the prevention at radio-frequency port of 100 ohmage of difference.When one of endpoint is as signal end, another
As signal reflux end, the bandstop filter of single port (un-balanced) may be designed in.
In the present embodiment, the resonance frequency of all piezo-electric resonators and the second T-type are humorous in the first T-type resonator element T1
The resonance frequency of all piezo-electric resonators is identical in vibration device unit T2.
Example IV
Fig. 7 shows the circuit structure of four bandstop filter of the present embodiment.As shown in fig. 7, the bandstop filter include by
The first T-type resonator element T1 of piezo-electric resonator T1-1, piezo-electric resonator T1-2 and piezo-electric resonator T1-3 composition, by piezoelectricity
The second T-type resonator element T2 of resonator T2-1, piezo-electric resonator T2-2 and piezo-electric resonator T2-3 composition, and be connected to
Between first T-type resonator element T1 and the second T-type resonator element T2 for realizing the first T-type resonator element T1 and
The parallel resonator RES of the matched well of two T-type resonator element T2.
Specifically, the piezo-electric resonator T1-1 is connected to input port IN+, the piezo-electric resonator by inductance L1
T1-3 is connected to input port IN- by inductance L2；The piezo-electric resonator T1-1 and piezo-electric resonator T1-3 also respectively with pressure
Electrical resonator T1-2 connection, the piezo-electric resonator T1-2 are connected to parallel resonator RES.Piezo-electric resonator T1-1, piezoelectricity are humorous
The device T1-2 and piezo-electric resonator T1-3 that shakes has identical resonance frequency.
The piezo-electric resonator T2-1 is connected to output port OUT+ by inductance L3；The piezo-electric resonator T2-3 passes through
Inductance L4 be connected to output port OUT-, the piezo-electric resonator T2-1 and piezo-electric resonator T2-3 also respectively with piezo-electric resonator
T2-2 connection, the piezo-electric resonator T2-2 are connected to parallel resonator RES.Piezo-electric resonator T2-1, piezo-electric resonator T2-2
There is identical resonance frequency with piezo-electric resonator T2-3.
In the present embodiment, the input port IN+, input port IN-, output port OUT+ and output port OUT- points
It is not single-ended 50 ohmage, the prevention at radio-frequency port of 100 ohmage of difference.When one of endpoint is as signal end, another
As signal reflux end, the bandstop filter of single port (un-balanced) may be designed in.
In the present embodiment, the resonance frequency of all piezo-electric resonators and the second T-type are humorous in the first T-type resonator element T1
The resonance frequency of all piezo-electric resonators is identical in vibration device unit T2.
Embodiment five
Fig. 8 shows the circuit structure of four bandstop filter of the present embodiment.As shown in figure 8, the bandstop filter include by
The first T-type resonator element T1 of piezo-electric resonator T1-1, piezo-electric resonator T1-2 and piezo-electric resonator T1-3 composition, by piezoelectricity
The second T-type resonator element T2 of resonator T2-1, piezo-electric resonator T2-2 and piezo-electric resonator T2-3 composition, and be connected to
Resonance circuit between first T-type resonator element T1 and the second T-type resonator element T2.
Specifically, the piezo-electric resonator T1-1 is connected to input port IN+, the piezo-electric resonator by inductance L1
T1-3 is connected to input port IN- by inductance L2；The piezo-electric resonator T1-1 and piezo-electric resonator T1-3 also respectively with pressure
Electrical resonator T1-2 connection, the piezo-electric resonator T1-2 are connected to resonance circuit.Piezo-electric resonator T1-1, piezo-electric resonator
T1-2 and piezo-electric resonator T1-3 has identical resonance frequency.
The piezo-electric resonator T2-1 is connected to output port OUT+ by inductance L3；The piezo-electric resonator T2-3 passes through
Inductance L4 be connected to output port OUT-, the piezo-electric resonator T2-1 and piezo-electric resonator T2-3 also respectively with piezo-electric resonator
T2-2 connection, the piezo-electric resonator T2-2 are connected to resonance circuit.Piezo-electric resonator T2-1, piezo-electric resonator T2-2 and piezoelectricity
Resonator T2-3 has identical resonance frequency.
In the present embodiment, the resonance circuit is made of inductance L and capacitor C in parallel, and effect is to realize the first T-type
The matched well of resonator element T1 and the second T-type resonator element T2 are inserted with reaching wider passband and lower passband
Enter loss, Resonance Circuit can improve stopband according to the impedance of itself and T-type resonator element to a certain extent
Bandwidth.
In the present embodiment, the input port IN+, input port IN-, output port OUT+ and output port OUT- points
It is not single-ended 50 ohmage, the prevention at radio-frequency port of 100 ohmage of difference.When one of endpoint is as signal end, another
As signal reflux end, the bandstop filter of single port (un-balanced) may be designed in.
In the present embodiment, the resonance frequency of all piezo-electric resonators and the second T-type are humorous in the first T-type resonator element T1
The resonance frequency of all piezo-electric resonators is identical in vibration device unit T2.
The bandstop filter that any one above-mentioned embodiment proposes realizes front stage using two T-type resonator elements
Matched well improves stopband and inhibits broadband to reach wider passband and lower pass band insertion loss, has preferable
Pass-band performance and roll-off characteristic realize better selecting frequency characteristic.
The present embodiment also provides a kind of communication equipment.The communication equipment includes above-described embodiment bandstop filter and transmitting-receiving
Device, bandstop filter is for selecting the signal transmitting and receiving of transceiver.
The specific structure and working principle of bandstop filter have carried out detailed narration in the above-described embodiments, here
It does not repeat.
The present embodiment communication equipment can be one in either simplex device, duplexer, splitter, combiner and tower amplifier
Kind, embodiment of the disclosure to this with no restriction.Communication equipment can also include more components, all parts and tunable band-stop
Connection relationship between filter is unrestricted.
More than, the only specific embodiment of the disclosure, but the protection scope of the disclosure is not limited thereto, and it is any to be familiar with
Those skilled in the art can easily think of the change or the replacement in the technical scope that the disclosure discloses, and should all cover
Within the protection scope of the disclosure.Therefore, the protection scope of the disclosure should be subject to the protection scope in claims.
Claims (9)
1. a kind of bandstop filter, which is characterized in that including the first T-type resonator element, the second T-type resonator element and connection
The matching to match between the first T-type resonator element and the second T-type resonator element for realizing two resonator elements
Circuit.
2. bandstop filter according to claim 1, which is characterized in that the first T-type resonator element is humorous by three
The identical first piezo-electric resonator composition of vibration frequency, wherein two the first piezo-electric resonators pass through inductance connection to two respectively
Input port, two the first piezo-electric resonators are also connect with another first piezo-electric resonator respectively, another first pressure
Electrical resonator is connected to match circuit.
3. bandstop filter according to claim 2, which is characterized in that the second T-type resonator element is humorous by three
The identical second piezo-electric resonator composition of vibration frequency, wherein two the second piezo-electric resonators pass through inductance connection to two respectively
Output port, two the second piezo-electric resonators are also connect with another second piezo-electric resonator respectively, another second pressure
Electrical resonator is connected to match circuit.
4. bandstop filter according to claim 3, which is characterized in that first piezo-electric resonator and the second piezoelectricity are humorous
The resonance frequency of vibration device is identical.
5. bandstop filter according to claim 3, which is characterized in that first piezo-electric resonator and the second piezoelectricity are humorous
The resonance frequency of vibration device is different.
6. bandstop filter according to claim 1, which is characterized in that the match circuit includes inductance or capacitor.
7. bandstop filter according to claim 1, which is characterized in that the match circuit includes series resonator or simultaneously
Join resonator.
8. bandstop filter according to claim 1, which is characterized in that the match circuit includes inductance and electricity in parallel
Hold.
9. a kind of communication equipment characterized by comprising claim 1 to the 8 any bandstop filter and receiver；
The bandstop filter is for selecting the signal transmitting and receiving of the receiver.
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| CN1494210A (en) * | 2002-09-30 | 2004-05-05 | ��ʿͨý�岿Ʒ��ʽ���� | Surface acoustic wave filter and surface acoustic wave duplexer with the same |
| CN102497172A (en) * | 2004-10-29 | 2012-06-13 | 北电网络有限公司 | Band reject filters |
| CN101584114A (en) * | 2006-11-27 | 2009-11-18 | 汤姆森特许公司 | Active low-pass filter |
| CN102763329A (en) * | 2010-02-25 | 2012-10-31 | 太阳诱电株式会社 | Filter, duplexer, communication module and communication device |
| CN103155411A (en) * | 2010-10-20 | 2013-06-12 | 埃普科斯股份有限公司 | Band rejection filter comprising serial connection of at least two pi-elements |
| CN108288959A (en) * | 2013-05-08 | 2018-07-17 | 天津大学 | Piezoelectric acoustic wave resonator and filter |
| CN103281050A (en) * | 2013-06-17 | 2013-09-04 | 天津大学 | Film bulk acoustic wave filter |
| CN104811156A (en) * | 2015-05-14 | 2015-07-29 | 中国电子科技集团公司第五十四研究所 | Resonance enhanced type broadband impedance matching circuit and matching method |
| CN104901650A (en) * | 2015-05-27 | 2015-09-09 | 北京工业大学 | Impedance matching device of high-power high-frequency excitation source and realizing method thereof |
| CN107342749A (en) * | 2017-06-05 | 2017-11-10 | 锐迪科微电子科技（上海）有限公司 | A kind of bandpass filter |
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