CN107565996A - The cantilever beam receiver front end that internet of things oriented standing wave energy and release model are collected - Google Patents
The cantilever beam receiver front end that internet of things oriented standing wave energy and release model are collected Download PDFInfo
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Abstract
The cantilever beam receiver front end that the internet of things oriented standing wave energy and release model of the present invention is collected receives microwave signal using microwave antenna and accesses the standing wave energy collection tunable filter based on cantilever beam and is filtered, collect standing wave energy simultaneously, after then signal enters low-noise amplifier and is exaggerated, into the cantilever beam frequency mixer of oscillation signals leak collection of energy, while mixing is realized, the energy of the local oscillated signal of mixing structure leakage is have collected, the signal after mixing realizes that intermediate frequency exports into intermediate-frequency filter；Two kinds of energy being collected above are stored in battery after being converted into DC voltage by AC/DC modular converters, store energy battery it is in parallel with dc source after, for active circuit power.The present invention can collect standing wave energy and release model, improve electromagnetic compatible environment, prevent local oscillated signal self-mixing, reduce power consumption, improve the performance of system.
Description
Technical field
The present invention proposes the cantilever beam receiver front end that a kind of internet of things oriented standing wave energy and release model are collected, category
In microelectromechanical systems (MEMS) technical field.
Background technology
The development of the communication technology realizes interpersonal exchange, and the technology of Internet of things based on internet realize thing with
Interconnection between thing, people and thing.One of core technology as Internet of Things, some defects limit that traditional receiver front end has
Its application in Internet of Things is made, for example the microwave signal outside wave filter frequency range can form standing wave, cause very strong electromagnetism
Interference；Part local oscillated signal leaks into low-noise amplifier through being mixed device, is then blocked producing back wave, this reflection
Ripple is mixed with local oscillated signal again, then can produce direct current signal in the output end of frequency mixer, can not only cause DC maladjustment,
DC power can also be increased.In recent years, with the fast development of MEMS technology, and MEMS energy collection technologies and MEMS are filtered
Device technology conducts in-depth research so that the cantilever beam receiver front end that internet of things oriented standing wave energy and release model are collected
Possibility with realization.
The content of the invention
Goal of the invention：It is an object of the invention to provide the cantilever that a kind of internet of things oriented standing wave energy and release model are collected
Beam receiver front end.Receiver uses microwave antenna reception signal, accesses the standing wave energy based on cantilever beam and collects adjustable filtering
Device is filtered, while reaches standing wave energy collection, reduces the purpose of standing wave electromagnetic interference.Filtered signal enters low noise
Amplifier amplifies, and exaggerated microwave signal enters the cantilever beam frequency mixer of oscillation signals leak collection of energy, is realizing tradition
While mixing, DC maladjustment caused by local oscillated signal self-mixing is eliminated, and the local for collecting mixing structure leakage shakes
The energy of signal is swung, the signal after mixing connects intermediate-frequency filter, finally realizes that intermediate frequency exports.Two kinds of energy being collected above are same
When DC voltage is converted into by AC/DC modular converters after be stored in rechargeable battery, after rechargeable battery is in parallel with dc source with
Active circuit is connected, and realizes the self-powered of active circuit.
Technical scheme：In order to solve the above technical problems, the present invention proposes a kind of internet of things oriented standing wave energy and leakage
The cantilever beam receiver front end of collection of energy.Before the cantilever beam receiver that the internet of things oriented standing wave energy and release model are collected
End includes:Microwave antenna, the standing wave energy based on cantilever beam collect tunable filter, rechargeable battery, low-noise amplifier, vibration
Cantilever beam frequency mixer, local oscillator, intermediate-frequency filter and the dc source of signals leakiness collection of energy.
Microwave antenna, for receiving microwave signal.
Standing wave energy based on cantilever beam collects tunable filter, is by LC variable band-pass filters, the filter of LC tunable band-stops
Ripple device 10, LC tunable band-stop filters 11, the 12-2 of one 12-1, AC/DC modular converter of AC/DC modular converters two, microwave signal are defeated
Inbound port and microwave signal output port are formed.Wherein LC tunable band-stop filters 10 and the structure of LC tunable band-stop filters 11 is complete
Complete the same, the frequency domain of its stopband is identical with the frequency domain of LC bandpass filter passbands, forms complementary, the He of LC tunable band-stop filters 10
The passband frequency domain of LC tunable band-stop filters 11 is identical with the frequency domain of standing wave signal, can collect LC variable band-pass filters both ends
Standing wave energy, and can realize that filter filtering frequency range is adjustable.
Rechargeable battery, by 12-2 the and AC/DC modular converters 3 22 of one 12-1, AC/DC modular converter of AC/DC modular converters two
Obtained DC voltage energy storage is while in parallel with dc source 4 among battery, and self-powered is realized to active circuit.
Low-noise amplifier, amplifies the microwave signal of input, and the cantilever beam for accessing oscillation signals leak collection of energy mixes
Frequency device.
The cantilever beam frequency mixer of oscillation signals leak collection of energy, it is by bandpass filter 21, AC/DC modular converters 3 22
Formed with mixing structure 26.Mixing structure 26 is three-port network, connects signal input port 24, local oscillated signal respectively
Input port 23 and mixed frequency signal output port 25, the input of bandpass filter 21 are connected with being mixed the input of structure 26
Connect, local oscillator 7 is connected with being mixed the local oscillated signal input port 23 of structure 26, the output termination of bandpass filter
AC/DC modular converters 3 22, AC/DC modular converters 3 22 are connected with rechargeable battery realizes collection of energy.Wherein bandpass filter
21 centre frequency is identical with the frequency of local oscillated signal, can collect what is leaked by local oscillated signal through being mixed structure 26
Energy, solve the problems, such as the local oscillated signal self-mixing of leakage, and have collected and let out by local oscillated signal through being mixed structure
The energy of leakage；And input signal belongs to the stopband frequency domain of bandpass filter 21, its frequency be in the passband of bandpass filter 21 with
Outside, mixing structure 26 will not be directly entered by bandpass filter 21.
Local oscillator, produce local oscillated signal.
Intermediate-frequency filter, intermediate-freuqncy signal is exported after filtering.
Beneficial effect：
The present invention has advantages below relative to existing microwave receiver：
1. include base in the cantilever beam receiver front end that the internet of things oriented standing wave energy and release model of the present invention are collected
Tunable filter is collected in the standing wave energy of cantilever beam.Described wave filter only needs simply to control under condenser type cantilever beam
Draw the size of driving voltage, it is possible to the filtering of wave filter is adjusted, it is not only simple to operate, and positive effect.It is in addition, of the invention
In the duplicate LC tunable band-stop filters stopband of two structures frequency domain it is identical with the frequency domain of LC bandpass filter passbands,
Formation is complementary, and the microwave signal outside the passband frequency range of LC variable band-pass filters forms standing wave, the filter of LC tunable band-stops at its both ends
The passband frequency range of ripple device 10 and LC tunable band-stop filters 11 is identical with standing wave signal frequency range, can collect the filtering of LC tunable band-pass
The standing wave at device both ends, and DC voltage is converted into using AC/DC modular converters, it is ultimately stored in rechargeable battery, in filtering
Meanwhile also improve the electromagnetic compatible environment of circuit；
2. the cantilever beam receiver front end that the internet of things oriented standing wave energy and release model of the present invention are collected includes vibration
The cantilever beam frequency mixer of signals leakiness collection of energy.Described frequency mixer has added bandpass filter before traditional mixing structure
21, the centre frequency of bandpass filter 21 is identical with the frequency of local oscillated signal, can will be by local oscillated signal through overmulling
The energy absorption of frequency structure leakage, can solve by energy absorption of the local oscillated signal by mixing structure leakage and let out
The problem of local oscillated signal self-mixing of leakage, and input signal belongs to the stopband frequency domain of bandpass filter 21, its frequency is in
Beyond the passband of bandpass filter 21, mixing structure will not be directly entered by bandpass filter 21, this, which is designed, causes leakage
Energy is collected, and is finally stored in rechargeable battery, reduces DC power；
3. rechargeable battery is in parallel with dc source, self-powered is realized to active circuit.
Brief description of the drawings
Fig. 1 is the principle for the cantilever beam receiver front end that the internet of things oriented standing wave energy of the present invention and release model are collected
Block diagram.
Fig. 2 is the structured flowchart that the standing wave energy based on cantilever beam collects tunable filter.
Fig. 3 is the schematic diagram of LC variable band-pass filters and bandpass filter 21.
Fig. 4 is the schematic diagram of LC tunable band-stop filters 10 and LC tunable band-stop filters 11.
Fig. 5 is the electric capacity in LC variable band-pass filters, LC tunable band-stop filters 10 and LC tunable band-stop filters 11
The top view of formula cantilever beam.
Fig. 6 is the electric capacity in LC variable band-pass filters, LC tunable band-stop filters 10 and LC tunable band-stop filters 11
BB ' the faces profile of formula cantilever beam.
Fig. 7 is the structure chart of the cantilever beam frequency mixer of oscillation signals leak collection of energy.
The theory diagram for the cantilever beam receiver front end that internet of things oriented standing wave energy and release model are collected includes：It is micro-
Wave antenna 1, the standing wave energy based on cantilever beam collect tunable filter 2, rechargeable battery 3, dc source 4, low-noise amplifier
5, frequency mixer 6, local oscillator 7, intermediate-frequency filter 8, intermediate frequency output 9.Standing wave energy based on cantilever beam collects adjustable filtering
Device 2 is by LC variable band-pass filters, LC tunable band-stop filters 10, LC tunable band-stop filters 11, AC/DC modular converters one
The 12-2 of 12-1, AC/DC modular converter two, microwave signal input port, microwave signal output port, LC variable band-pass filters,
Bandpass filter 21 and LC tunable band-stop filters are formed by planar inductor and condenser type cantilever beam.Condenser type cantilever beam is by silicon
Substrate 20, pull-down electrode 13, first paragraph transmission line 15, second segment transmission line 14, the second silicon nitride medium layer 16, the first silicon nitride
Dielectric layer 17, anchor area 18 and cantilever beam 19 are formed.The cantilever beam frequency mixer 6 of oscillation signals leak collection of energy is by signal input part
Mouth 24, mixed frequency signal output port 25, bandpass filter 21, AC/DC modular converters 3 22, it is mixed structure 26 and local oscillations letter
Number input port 23 is formed.
Embodiment
The present invention is further described below in conjunction with the accompanying drawings.
The specific implementation for the cantilever beam receiver front end that the internet of things oriented standing wave energy and release model of the present invention is collected
Scheme is as follows：
The present invention proposes that the cantilever beam receiver front end that internet of things oriented standing wave energy and release model are collected includes：Microwave
Antenna 1, the standing wave energy collection tunable filter 2 based on cantilever beam, rechargeable battery 3, dc source 4, low-noise amplifier 5,
Frequency mixer 6, local oscillator 7, intermediate-frequency filter 8, intermediate frequency output 9.Standing wave energy based on cantilever beam collects tunable filter 2
By LC variable band-pass filters, LC tunable band-stop filters 10, LC tunable band-stop filters 11, the 12-1 of AC/DC modular converters one,
The 12-2 of AC/DC modular converters two, microwave signal input port, microwave signal output port, LC variable band-pass filters, band logical filter
Ripple device 21 and LC tunable band-stop filters are formed by planar inductor and condenser type cantilever beam.Condenser type cantilever beam is by silicon substrate
20th, pull-down electrode 13, first paragraph transmission line 15, second segment transmission line 14, the second silicon nitride medium layer 16, the first silicon nitride medium
Floor 17, anchor area 18 and cantilever beam 19 are formed.The cantilever beam frequency mixer 6 of oscillation signals leak collection of energy is by signal input port
24, mixed frequency signal output port 25, bandpass filter 21, AC/DC modular converters 3 22, it is mixed structure 26 and local oscillated signal
Input port 23 is formed.
As shown in figure 1, microwave antenna 1 receives microwave signal, the signal is collected by the standing wave energy based on cantilever beam
After tunable filter 2, realizing that the standing wave energy that bandpass filter both ends are formed can be by the bandreject filtering at both ends while filtering
The wave filter of device absorbs.Then signal reaches the low-noise amplifier 5 of next stage, and exaggerated microwave signal passes through oscillator signal
The cantilever beam frequency mixer 6 that release model is collected, except that realizes conventional mixer structure downconverts to intermediate-freuqncy signal by input signal
Function outside, can collect mixing structure leakage local oscillated signal energy.Signal after mixing passes through intermediate frequency filtering
After device 8 filters, manageable intermediate frequency output 9 can be obtained.Standing wave energy based on cantilever beam is collected tunable filter 2 and shaken
The AC/DC modular converters for swinging the cantilever beam frequency mixer 6 of signals leakiness collection of energy connect rechargeable battery 3 respectively, rechargeable battery 3 with
After the parallel connection of dc source 4, common is low-noise amplifier 5, the cantilever beam frequency mixer 6 of oscillation signals leak collection of energy and local
Oscillator 7 provides energy.
Filtered as shown in Fig. 2 the standing wave energy based on cantilever beam collects tunable filter 2 including LC tunable band-pass
Device, LC tunable band-stop filters 10, LC tunable band-stop filters 11,12-1, AC/DC modular converter two of AC/DC modular converters one
12-2, microwave signal input port and microwave signal output port；The duplicate LC tunable band-stops filtering of two of which structure
The frequency domain of the stopband of device 10 and 11 is identical with the frequency domain of LC variable band-pass filter passbands, forms complementary, LC variable band-pass filters
Passband frequency range outside microwave signal form standing wave, LC tunable band-stop filters 10 and LC tunable band-stop filters 11 at its both ends
Passband frequency range it is identical with standing wave signal frequency range, the standing wave at LC variable band-pass filters both ends can be collected.
As shown in figure 3, described LC variable band-pass filters and bandpass filter 21 are by planar inductor L1, planar inductor
L2 and condenser type cantilever beam K1, condenser type cantilever beam K2 are formed.Wherein condenser type cantilever beam K1 one end is defeated as microwave signal
Inbound port, the other end connection planar inductor L1, condenser type cantilever beam K1 metal pad connections ground, the planar inductor L1 other end
It is connected with planar inductor L2, condenser type cantilever beam K2, planar inductor L2 other end ground connection, the condenser type cantilever beam K1 other end
Vacantly, output end of the condenser type cantilever beam K1 metal pad leads as wave filter, by controlling condenser type cantilever beam K1 and electricity
Appearance formula cantilever beam K2 drop-down driving voltage can adjust electric capacity C1, C2 of access size so as to adjust the passband of wave filter frequency
Domain.
As shown in figure 4, described LC tunable band-stop filters 10 and LC tunable band-stop filters 11 are by planar inductor L2, flat
Face inductance L1 and condenser type cantilever beam K2, condenser type cantilever beam K1 are formed.Wherein condenser type cantilever beam K2 one end is as microwave
Signal input port, the other end connection planar inductor L2, condenser type cantilever beam K2 metal pad connections ground, planar inductor L2's
The other end is connected with planar inductor L1, condenser type cantilever beam K1, planar inductor L1 other end ground connection, condenser type cantilever beam K1's
The other end is hanging, the output end of condenser type cantilever beam K1 metal pad leads as wave filter, by controlling condenser type cantilever beam
K1 and condenser type cantilever beam K1 drop-down driving voltage can adjust the capacitance size of access so as to adjust the passband of wave filter frequency
Domain.
If Fig. 5 is the top view of the condenser type cantilever beam in LC variable band-pass filters and LC tunable band-stop filters, Fig. 6
It is the BB ＇ faces profile of the condenser type cantilever beam in LC variable band-pass filters and LC tunable band-stop filters.Such as Fig. 5, Fig. 6 institute
Show, the condenser type cantilever beam in LC variable band-pass filters and LC tunable band-stop filters has first paragraph at the both ends of silicon substrate 20
Transmission line 15 and second segment transmission line 14, there is the second silicon nitride medium layer 16 in the inside upper part of first paragraph transmission line 15, under
Pulling electrode 13 is provided with the first silicon nitride medium layer 17, in the Shang Youmao areas 18 of second segment transmission line 14, anchor area 18 and cantilever beam 19
One end be connected, cantilever beam 19 is vacantly in the top of the first silicon nitride medium layer 17 and the second silicon nitride medium layer 16.
Fig. 7 is the structure chart of the cantilever beam frequency mixer of oscillation signals leak collection of energy, oscillation signals leak collection of energy
Cantilever beam frequency mixer be signal input port 24, mixed frequency signal output by bandpass filter 21, AC/DC modular converters 3 22
Port 25 and mixing structure 26 are formed, wherein mixing structure 26 is three-port network；Signal input port 24 and bandpass filter
After 21 input is connected, then the input with being mixed structure 26 is connected, the output end connection AC/DC conversions of bandpass filter 21
Module 3 22, the local oscillated signal input port 24 of mixing structure 26 connect the output end of local oscillator 7, ultimately mixing knot
Intermediate-freuqncy signal after the output mixing of mixed frequency signal output port 25 of structure 26；The centre frequency of bandpass filter 21 and local oscillations
The frequency of signal is identical, by the energy absorption leaked by local oscillated signal by mixing structure, can solve the sheet of leakage
The problem of ground oscillator signal self-mixing, and the input signal of the frequency mixer of oscillator signal leakage collection of energy belongs to bandpass filter
21 stopband frequency domain, its frequency are in beyond the passband of bandpass filter 21, will not be directly entered mixed by bandpass filter 21
Frequency structure.
Present invention be distinguished in that：The self-powered cantilever beam microwave receiver front end bag of internet of things oriented of the present invention
Tunable filter is collected containing the standing wave energy based on cantilever beam.Standing wave energy based on cantilever beam collects tunable filter and uses LC
Variable band-pass filter is filtered to microwave signal, LC variable band-pass filters filtering frequency range outside microwave signal can its two
End forms the passband frequency range and standing wave signal frequency range of standing wave signal, LC tunable band-stop filters 10 and LC tunable band-stop filters 11
It is identical, the standing wave at LC variable band-pass filters both ends can be collected, and DC voltage is converted into using AC/DC modular converters, most
It is stored in eventually in rechargeable battery, and the frequency domain of the duplicate LC tunable band-stop filters stopband of two structures and LC bandpass filterings
The frequency domain of device passband is identical, forms complementation, and this design also improves the electromagnetic compatible environment of circuit while filtering.
The cantilever beam receiver front end that the internet of things oriented standing wave energy and release model of the present invention is collected, which includes vibration, to be believed
The cantilever beam frequency mixer that number release model is collected.The cantilever beam frequency mixer of oscillation signals leak collection of energy is in traditional mixing knot
In parallel bandpass filter and AC/DC modular converters are collecting the local oscillated signal energy leaked by mixing structure before structure.
Bandpass filter is made up of planar inductor and condenser type cantilever beam, by simply controlling the drop-down of condenser type cantilever beam to drive
Voltage come adjust access filter network electric capacity size, so as to adjust the passband frequency domain of wave filter so that input signal will not
Filtered out by the wave filter, and the oscillator signal to be come by the leakage of mixing structure can reach AC/DC modular converters by wave filter, and
Be converted to direct current signal to collect, be stored among rechargeable battery.
The cantilever beam receiver front end that the internet of things oriented standing wave energy and release model of the present invention is collected includes charging electricity
Pond 3.It is low-noise amplifier 5 after rechargeable battery 3 is in parallel with dc source 4, the cantilever beam of oscillation signals leak collection of energy mixes
Frequency device 6, local oscillator 7 are powered, and realize the self-powered of active circuit.
Meet conditions above structure can be considered the present invention internet of things oriented standing wave energy and release model collect
Cantilever beam receiver front end.
Described above is only the preferred embodiment of the present invention, it should be pointed out that：For the ordinary skill people of the art
For member, under the premise without departing from the principles of the invention, some improvements and modifications can also be made, these improvements and modifications also should
It is considered as protection scope of the present invention.
Claims (4)
- A kind of 1. cantilever beam receiver front end that internet of things oriented standing wave energy and release model are collected, it is characterised in that including Microwave antenna (1), standing wave energy based on cantilever beam collect tunable filter (2), rechargeable battery (3), dc source (4), low Noise amplifier (5), the cantilever beam frequency mixer (6) of oscillation signals leak collection of energy, local oscillator (7), intermediate-frequency filter (8) and intermediate frequency exports (9)；Standing wave energy of microwave antenna (1) connection based on cantilever beam collects the input of tunable filter (2) End, the standing wave energy based on cantilever beam are collected tunable filter (2) output end and are connected with the input of low-noise amplifier (5), The signal input port of the cantilever beam frequency mixer (6) of the output connection oscillation signals leak collection of energy of low-noise amplifier (5) (24), the output end of local oscillator (7) and the local oscillations of the cantilever beam frequency mixer (6) of oscillation signals leak collection of energy are believed Number input port (23) is connected, the mixed frequency signal output port of the cantilever beam frequency mixer (6) of oscillation signals leak collection of energy (25) it is connected with intermediate-frequency filter (8) input, the output end of intermediate-frequency filter obtains the accessible phase in microwave receiver rear end (9) are exported to stable intermediate frequency；Standing wave energy based on cantilever beam collects tunable filter (2) and oscillation signals leak energy is received The cantilever beam frequency mixer (6) of collection connects rechargeable battery (3) respectively, is low noise after rechargeable battery (3) is in parallel with dc source (4) Acoustic amplifier (5), cantilever beam frequency mixer (6) and local oscillator (7) the offer energy of oscillation signals leak collection of energy are simultaneously real Existing self-powered；The described standing wave energy based on cantilever beam collects tunable filter (2) and have collected the energy of standing wave and be stored in In rechargeable battery (3), electromagnetic compatible environment is improved；The cantilever beam frequency mixer (6) of oscillation signals leak collection of energy have collected By energy of the local oscillated signal by mixing structure leakage and it is stored in rechargeable battery (3), avoids local oscillated signal Self-mixing, reduce DC power.
- 2. the cantilever beam receiver front end that internet of things oriented standing wave energy according to claim 1 and release model are collected, It is characterized in that the standing wave energy collection tunable filter (2) based on cantilever beam can including LC variable band-pass filters, LC Adjust bandstop filter (10), LC tunable band-stop filters (11), AC/DC modular converters one (12-1), AC/DC modular converters two (12-2), microwave signal input port and microwave signal output port；Described LC variable band-pass filters, the filter of LC tunable band-stops Ripple device (10), LC tunable band-stop filters (11), AC/DC modular converters one (12-1) and AC/DC modular converters two (12-2) are all For two-port network；Input connection LC tunable band-stop filters (10) input of LC variable band-pass filters；LC adjustable bands Output end connection LC tunable band-stop filters (11) input of bandpass filter；The output end of LC tunable band-stop filters (10) connects Connect AC/DC modular converters one (12-1) input, the output end connection rechargeable battery (3) of AC/DC modular converters one (12-1)； The input of the output end connection AC/DC modular converters two (12-2) of LC tunable band-stop filters (11), AC/DC modular converters two The output end of (12-2) also connects rechargeable battery (3)；The described standing wave energy based on cantilever beam collects the micro- of tunable filter Microwave signal input port input of the ripple signal between LC variable band-pass filters and LC tunable band-stop filters (10), from LC Microwave signal output port output between variable band-pass filter and LC tunable band-stop filters (11)；Described LC adjustable bands Resistance wave filter (10) and LC tunable band-stop filters (11) structure is just the same, frequency domain and the LC bandpass filter passbands of its stopband Frequency domain it is identical, formed it is complementary, to collect the standing wave energy at LC variable band-pass filters both ends.
- 3. the cantilever beam receiver front end that internet of things oriented standing wave energy according to claim 2 and release model are collected, It is characterized in that described LC variable band-pass filters and LC tunable band-stop filters include condenser type cantilever beam；Work as transmission line (14) top crown and conduct microwave signal output port as electric capacity, should when transmission line (15) is used as bottom crown and connects ground Condenser type cantilever beam is equivalent to shunt capacitance；When top crown of the transmission line (14) as electric capacity, transmission line (15) is used as bottom crown And when connecting microwave signal output port, the condenser type cantilever beam is equivalent to series capacitance；By controlling condenser type cantilever beam Drop-down driving voltage in drop-down driving electrodes (13) can adjust the size of the electric capacity of access so as to adjust the passband of wave filter Frequency domain so that the passband frequency range of LC tunable band-stop filters (10) and LC tunable band-stop filters (11) filters with LC tunable band-pass The standing wave signal frequency range at device both ends is identical, and the frequency domain of the duplicate LC tunable band-stop filters stopband of two structures and LC bands The frequency domain of bandpass filter passband is identical, is formed complementary.
- 4. the cantilever beam receiver front end that internet of things oriented standing wave energy according to claim 1 and release model are collected, It is characterized in that the cantilever beam frequency mixer of described oscillation signals leak collection of energy includes bandpass filter (21), AC/DC turns Change the mold block three (22), signal input port (24), mixed frequency signal output port (25) and mixing structure (26), wherein being mixed structure (26) it is three-port network；After signal input port (24) is connected with the input of bandpass filter (21), then with being mixed structure (26) input is connected, the output end connection AC/DC modular converters three (22) of bandpass filter (21), AC/DC modular converters Three (22) connection rechargeable battery (3), local oscillated signal input port (24) the connection local oscillator (7) of mixing structure (26) Output end, ultimately mixing structure (26) mixed frequency signal output port (25) output mixing after intermediate-freuqncy signal；Bandpass filtering The centre frequency of device (21) is identical with the frequency of local oscillated signal, can will pass through mixing structure (26) by local oscillated signal The energy absorption of leakage, solve the problems, such as the local oscillated signal self-mixing of leakage, and input signal belongs to bandpass filter (21) stopband frequency domain, its frequency are in beyond the passband of bandpass filter (21), will not be by bandpass filter (21), directly Into mixing structure (26).
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