CN207834544U - A kind of duplexing filtered switch based on coupling control - Google Patents
A kind of duplexing filtered switch based on coupling control Download PDFInfo
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- CN207834544U CN207834544U CN201820049211.8U CN201820049211U CN207834544U CN 207834544 U CN207834544 U CN 207834544U CN 201820049211 U CN201820049211 U CN 201820049211U CN 207834544 U CN207834544 U CN 207834544U
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Abstract
The utility model discloses a kind of duplexing filtered switch based on coupling control, including upper-layer micro-strip structure, intermediate medium substrate and underlying metal floor, the first feed line is arranged in the upper-layer micro-strip structure, second feed line, third feed line, first resonator, second resonator, third resonator, 4th resonator, first switch circuit and second switch circuit, the filter network for being operated in two different frequencies that three feed lines and four resonators are constituted, the utility model proposes duplexing filtered switch can be adapted for two frequency working bands in close proximity, creative and practicability.
Description
Technical field
The utility model is related to duplexing filtered switch, more particularly to a kind of duplexing filtered switch based on coupling control.
Background technology
In multi-frequency radio transceiver system, duplexer and duplexer switch are important composition device.One duplexer
If the performance for being integrated with RF switch and bandpass filter obtains duplexing filtered switch；It can be used for realizing multiple transmitting-receiving letters
Multi-frequency multi-mode wireless module in the RF front-end circuit of machine shares common antenna, to be greatly reduced the volume of system.
Duplexing filtered switch requires smaller insertion loss, to improve the signal-to-noise ratio of antenna reception；To have simultaneously
There is very high isolation, prevents the signal of transmitting terminal from coupling such as receiving terminal, burn out receiver.In recent years, at home and abroad scholar in correlation
Aspect expands many researchs.Most outstanding cavity duplexer has filter with low insertion loss, the features such as high isolation, but cost mistake
In costliness, and volume is larger, weight weight, limits application of the cavity duplexer in certain scenes.The device of microstrip structure
Has many advantages, such as low cost, light-weight, small；Many scholars also realize duplexer or duplexer switch circuit with it；Such as
There is the filtered switch that scholar has used the technology of step impedance resonator and public resonator to realize single-pole double throw, but it is only
A working frequency range can be operated in；In addition some scholars devise duplexer switch circuit based on parallel coupling filter, but it
Can only at a time have and export all the way, cannot function as duplexer, work at the same time in two working frequency range.It also seldom proposes at present
There is duplexing filtered switch with any switching laws to one of working band or can work at the same time in two working frequency range or two works
Make all idle several states of frequency range.
Utility model content
In order to overcome shortcoming and deficiency of the existing technology, the utility model to provide a kind of duplex based on coupling control
Filtered switch.
The utility model constitutes two filtering nets for working in different frequency bands using three feed lines and four resonators
Network；Switching circuit loads on two output feed lines, the coupling for controlling feed line and resonator；The duplex filtered switch
It can be operated in two different working frequency range respectively or work at the same time or do not work in two working frequency range；When it is operating only at
When one of frequency range, resonance is loaded in two resonators of another working band on incoming feeder, forms band resistance
Characteristic has good inhibition in another working band；When two band operations, there is filtering duplex well
The performance of device；The filtering duplexer switch also has the effect of Wide stop bands, the Out-of-band rejection effect of 20dB reach 3 times of working frequencies with
On；The utility model proposes duplexing filtered switch can be adapted for two frequency working bands in close proximity.
The utility model adopts the following technical solution：
A kind of duplexing filtered switch based on coupling control, including upper-layer micro-strip structure, intermediate medium substrate and bottom gold
Possession plate, the upper-layer micro-strip structure includes the first feed line, the second feed line, third feed line, the first resonator, second humorous
Shake device, third resonator, the 4th resonator, first switch circuit and second switch circuit, first, second and third feed
Line is connected respectively first port, second port and third port, and second feed line one end connects with first switch circuit
It connects, the other end is connect by the first capacity earth, third feed line one end with second switch circuit, and the other end passes through second
Capacity earth；
First feed line is coupled with the first resonator, and the first resonator is coupled with the second resonator, the second resonator
It is coupled with the second feed line, forms the first filter network；
First feed line is coupled with third resonator, and third resonator is coupled with the 4th resonator, the 4th resonator
It is coupled with third feed line, forms the second filter network.
The structure of the first switch circuit and second switch circuit is identical, by capacitance, inductance and switching diode structure
At.
The second port is arranged in the centre position of the second feed line, for realizing the second feed line and the second resonator
The coefficient of coup control；
The third port is arranged in the centre position of third feed line, for realizing third feed line and the 4th resonator
Coupled system control；
The first port is arranged in one end of the first feed line.
Further include the first T-type microstrip structure and the second T-type microstrip structure, is separately positioned on the first resonator and third resonance
The centre position of device physical size.
The working frequency of first filter network is different from the working frequency of the second filter network, the first filter network
Working frequency is determined that the working frequency of second filter network is by by the resonant frequency of the first resonator and the second resonator
The resonant frequency of three resonators and the 4th resonator determines.
The length of second resonator and the 4th resonator is respectively the first filter network and the work of the second filter network
The half of waveguide wavelength corresponding to frequency.
The capacitance size of second feed line and third feed line connection capacitance is by loading in first switch circuit and second
The capacity effect when on-load voltage of switching circuit makes switching diode be connected determines, and second port and third port is made to be in
The centre position of second feed line and third feed line physical size.
First resonator, the second resonator, third resonator and the 4th resonator are open loop structures, according to from a left side
It is to right sequence：Second resonator, the first resonator, third resonator and the 4th resonator, first and second described resonance
The open ring position of device is identical, and the open ring position of the third resonator and the 4th resonator is identical.
Utility model works in four kinds of states, respectively state one, state two, state three and state four,
For the moment, first port to second port is access to state, and first port to third port is open circuit；
When state two, first port to second port is open circuit, and first port to third port is access；
When state three, first port to second port and third port are all access；
When state four, first port to second port and third port are all open circuit.
The beneficial effects of the utility model：
(1) the utility model realizes the control to duplexing filtered switch using the method for coupling control, when certain works all the way
When, the state that switching diode is off, nonpassage of signal mistake will not introduce additional loss, realize low-loss；
(2) when the duplexing filtered switch of the utility model is operating only at one of frequency range, resonance works in another
Two resonators of frequency band load on incoming feeder, form band-stop response, have in another working band good
Inhibition；
(3) the duplexing filtered switch of the utility model can be worked at the same time in two working bands, realize duplex well
Device performance.
Description of the drawings
Fig. 1 is a kind of structure chart of the filtering duplexer switch based on coupling control of the utility model；
Fig. 2 is the experimental result that a kind of filtering duplexer switch based on coupling control of the utility model works in state one
Figure；
Fig. 3 is the experimental result that a kind of filtering duplexer switch based on coupling control of the utility model works in state two
Figure；
Fig. 4 is the experimental result that a kind of filtering duplexer switch based on coupling control of the utility model works in state three
Figure；
Fig. 5 is the experimental result that a kind of filtering duplexer switch based on coupling control of the utility model works in state four
Figure.
Specific implementation mode
With reference to embodiment and attached drawing, the utility model is described in further detail, but the reality of the utility model
It is without being limited thereto to apply mode.
Embodiment
As shown in Figure 1, a kind of duplexing filtered switch based on coupling control, including upper-layer micro-strip structure, intermediate medium base
Plate and underlying metal floor.
The upper-layer micro-strip structure include the first feed line 1, the second feed line 6, third feed line 7, the first resonator 2,
Second resonator 3, third resonator 4, the 4th resonator 5, first and second capacitance 12,13, first switch circuit 10 and second
Switching circuit 11, first, second and third feed line are connected respectively first port P1, second port P2 and third end
Mouthful P3, described second feed line, 6 one end are connect with first switch circuit 10, and the other end is grounded by the first capacitance 12, and described the
Three feed line one end are connect with second switch circuit 11, and the other end is grounded by the second capacitance 13；
In entire upper-layer micro-strip structure, the first feed line is centrally located, and left side is the first resonator successively, second humorous
Shake device and the second feed line, and right side is third resonator, the 4th resonator and third feed line successively.
The first port P1 is located at the lower section of the first feed line, and the second port P2 is located at the second feed line electric size
Centre position, for realizing the control of the coefficient of coup to the second feed line and the second resonator, described third port P3
In the centre position of third feed line physical size, for realizing the control of third feed line and the coupled system of the 4th resonator
System.
Described first, second, third and the 4th resonator be open loop structure, the open loop of first and second specific resonator
Position is identical, and the open ring position of third and the 4th resonator is identical.
First feed line 1 is coupled with the first resonator 2, and the first resonator 2 is coupled with the second resonator 3, and second is humorous
The device 2 that shakes is coupled with the second feed line, forms the first filter network, the working frequency of first filter network is by the first resonator
It is determined with the resonant frequency of the second resonator.
First feed line is coupled with third resonator, and third resonator is coupled with the 4th resonator, the 4th resonator
It is coupled with third feed line, forms the second filter network, the working frequency of the second filter network is humorous by third resonator and the 4th
Shake device resonant frequency determine；And the working frequency of the two filter networks differs.
The length of second resonator and the 4th resonator is respectively two works of the utility model duplex filtered switch
The centre of the half of waveguide wavelength corresponding to working frequency, first resonator and third resonator is respectively arranged with first
T-type microstrip structure 8 and the second T-type microstrip structure 9, for realizing the even-times resonant frequency and the second resonator of the first resonator
Even-times resonant frequency differ, the even-times resonant frequency of the even-times resonant frequency and the 4th resonator of third resonator
It differs, realizes that the effect of Wide stop bands, rest part are identical with the second resonator and the 4th resonator respectively.
Two T-type microstrip structures are towards at open loop, and the size of the first T-type microstrip structure is more than the second T-type in the present embodiment
The size of microstrip structure.
The first switch circuit and second switch circuit are provided with two groups of DC voltages, control two groups of DC voltages, the
One and second switch circuit be made of capacitance, inductance and switching diode.
The load is electric by first switch respectively in the capacitance of the ground capacity of the second feed line and third feed line
The capacity effect of road and second switch circuit when on-load voltage makes switching diode be connected determines, is used for balance cock circuit
Capacity effect makes second port and third port still be respectively at the centre of the second feed line and third feed line.
A kind of duplexing filtered switch based on coupling control can be operated in four kinds of states, respectively state one, shape
State two, state three and state four；For the moment, first port to second port is access to state, and first port to third port is disconnected
Road；When state two, first port to second port is open circuit, and first port to third port is access；When state three, first end
It is access that mouth, which arrives second port and third port all,；When state four, first port to second port and third port are all open circuit.
A kind of filtering duplexer switch based on coupling control of the utility model shown in Fig. 2 works in the experimental result of state one
Figure, from S21 as can be seen that wherein first job band operation when, from first port to second port have good filtering
Performance, centre frequency 2.1GHz, return loss are more than 20dB, and band produces two transmission zeros outside, respectively in 2.4 Hes
At 2.59GHz frequencies, it is located at second working band, inhibits the signal of second working band well, presses down with outer 20dB
Level processed has reached 8GHz, has Wide stop bands effect；Have in two free transmission ranges from third port to the first and second ports
There is good isolation, is more than 40dB.
A kind of filtering duplexer switch based on coupling control of the utility model shown in Fig. 3 works in the experimental result of state two
Figure, from S31 as can be seen that wherein first job band operation when, from first port to second port have good filtering
Performance, centre frequency 2.45GHz, return loss are more than 20dB, and band produces two transmission zeros outside, respectively in 2.01 Hes
At 2.17GHz frequencies, it is located at first job frequency band, inhibits the signal of second working band well, presses down with outer 20dB
Level processed has reached 8GHz, has Wide stop bands effect；Have in two free transmission ranges from second port to first and third port
There is good isolation, is more than 40dB.
A kind of filtering duplexer switch based on coupling control of the utility model shown in Fig. 4 works in the experimental result of state three
Figure can be seen that the performance with good duplexer from S21 and S31, and the return loss of two frequency bands is all higher than 20dB, second
Being isolated in entire frequency range between third port is both greater than 20dB, and frequency range of the Out-of-band rejection more than 20dB reaches
8GHz.
A kind of filtering duplexer switch based on coupling control of the utility model shown in Fig. 5 works in the experimental result of state four
Figure, it can be seen that there is isolation well under full off state, in free transmission range, be more than 40dB.
The utility model constitutes two filtering nets for working in different frequency bands using three feed lines and four resonators
Network；Switching circuit loads on two output feed lines, the coupling for controlling feed line and resonator；The duplex filtered switch
It can be operated in two different working frequency range respectively or work at the same time or do not work in two working frequency range；When it is operating only at
When one of frequency range, resonance is loaded in two resonators of another working band on incoming feeder, forms band resistance
Characteristic has good inhibition in another working band；When two band operations, there is filtering duplex well
The performance of device；The filtering duplexer switch also has the effect of Wide stop bands, the Out-of-band rejection effect of 20dB reach 3 times of working frequencies with
On；
Above-described embodiment is the preferable embodiment of the utility model, but the embodiment of the utility model is not by described
The limitation of embodiment, under other any Spirit Essences and principle without departing from the utility model made by change, modify, replace
In generation, simplifies combination, should be equivalent substitute mode, is included within the scope of protection of the utility model.
Claims (7)
1. a kind of duplexing filtered switch based on coupling control, including upper-layer micro-strip structure, intermediate medium substrate and underlying metal
Floor, which is characterized in that the upper-layer micro-strip structure includes the first feed line, the second feed line, third feed line, the first resonance
Device, the second resonator, third resonator, the 4th resonator, first switch circuit and second switch circuit, described first, second
And third feed line is connected respectively first port, second port and third port, second feed line one end and first
Switching circuit connects, and by the first capacity earth, third feed line one end is connect the other end with second switch circuit, another
End passes through the second capacity earth；
First feed line is coupled with the first resonator, and the first resonator is coupled with the second resonator, the second resonator and
Two feed lines couple, and form the first filter network；
First feed line is coupled with third resonator, and third resonator is coupled with the 4th resonator, the 4th resonator and
Three feed lines couple, and form the second filter network.
2. duplex filtered switch according to claim 1, which is characterized in that the first switch circuit and second switch electricity
The structure on road is identical, is made of capacitance, inductance and switching diode.
3. duplex filtered switch according to claim 1, which is characterized in that the second port is arranged in the second feed line
Centre position；
The third port is arranged in the centre position of third feed line；
The first port is arranged in one end of the first feed line.
4. duplex filtered switch according to claim 1, which is characterized in that further include the first T-type microstrip structure and the 2nd T
Type microstrip structure is separately positioned on the centre position of the first resonator and third resonator physical size.
5. it is according to claim 1 duplex filtered switch, which is characterized in that the working frequency of first filter network with
The working frequency of second filter network is different.
6. duplex filtered switch according to claim 5, which is characterized in that second resonator and the 4th resonator
Length is respectively the half of the waveguide wavelength corresponding to the first filter network and the second filter network working frequency.
7. duplex filtered switch according to claim 1, which is characterized in that first resonator, the second resonator, the
Three resonators and the 4th resonator are open loop structures, are according to sequence from left to right：Second resonator, the first resonator,
Third resonator and the 4th resonator, the open ring position of first and second resonator is identical, the third resonator and
The open ring position of four resonators is identical.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820049211.8U CN207834544U (en) | 2018-01-11 | 2018-01-11 | A kind of duplexing filtered switch based on coupling control |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820049211.8U CN207834544U (en) | 2018-01-11 | 2018-01-11 | A kind of duplexing filtered switch based on coupling control |
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| Publication Number | Publication Date |
|---|---|
| CN207834544U true CN207834544U (en) | 2018-09-07 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820049211.8U Withdrawn - After Issue CN207834544U (en) | 2018-01-11 | 2018-01-11 | A kind of duplexing filtered switch based on coupling control |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108448212A (en) * | 2018-01-11 | 2018-08-24 | 华南理工大学 | A kind of duplexing filtered switch based on coupling control |
-
2018
- 2018-01-11 CN CN201820049211.8U patent/CN207834544U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108448212A (en) * | 2018-01-11 | 2018-08-24 | 华南理工大学 | A kind of duplexing filtered switch based on coupling control |
| CN108448212B (en) * | 2018-01-11 | 2020-02-18 | 华南理工大学 | Duplex filtering switch based on coupling control |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20180907 Effective date of abandoning: 20200218 |