CN103116073A - Cantilever beam and direct-type power sensor based microwave detecting system and detecting method thereof - Google Patents

Cantilever beam and direct-type power sensor based microwave detecting system and detecting method thereof Download PDF

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CN103116073A
CN103116073A CN2013100284719A CN201310028471A CN103116073A CN 103116073 A CN103116073 A CN 103116073A CN 2013100284719 A CN2013100284719 A CN 2013100284719A CN 201310028471 A CN201310028471 A CN 201310028471A CN 103116073 A CN103116073 A CN 103116073A
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廖小平
易真翔
吴昊
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Southeast University
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Abstract

The invention discloses a cantilever beam and direct-type power sensor based microwave detecting system and a detecting method thereof. The detecting system comprises an MEMS (micro-electromechanical system) reconfigurable antenna, an MEMS adjustable filter, a control circuit and a microwave detector, the microwave detector is manufactured on a GaAs substrate and comprises a CPW (coplanar waveguide) transmission line, four structurally identical MEMS cantilever beam structures, a power combiner and four structurally identical MEMS direct-type microwave power sensors. The cantilever beam and direct-type power sensor based microwave detecting system has the advantages of novel structure and small size, can achieve integration of microwave signal frequency and power detection, and can be compatible with a GaAs monolithic microwave integrated circuit.

Description

Microwave detection system and detection method thereof based on semi-girder and direct-type power sensor
Technical field
The invention belongs to microelectromechanical systems MEMS technical field, be a kind of online microwave frequency detector and detection method thereof based on semi-girder and direct-type power sensor.
Background technology
Along with the fast development of science and technology, the research of microwave technology is more and more deep, thereby the detection of the power of microwave signal and these two important parameters of frequency is also essential.The detecting device of microwave signal frequency and power has very widely at aspects such as military affairs, business and scientific researches to be used.Current microwave frequency detection technique is mainly based on process of heterodyning, counting method, phase comparing method and resonance method principle, and the microwave power detection technology is mainly based on the method for diode, thermopair and thermistor.But these methods are all discrete, and this just brings a unavoidable defective: can't realize the system integration of frequency detecting and power detection.Along with the development of science and technology, the requirement of modern PCS Personal Communications System and radar system is more and more higher: low-power consumption, miniaturization and can become new trend by single chip integrated microwave frequency detector.In recent years, along with the extensive utilization of MEMS technology in the radar communication field, and to the deepening continuously of MEMS cantilever beam structure and MEMS direct-type microwave power detector research, making based on the microwave frequency of semi-girder and direct-type power sensor and the system integration of power detection becomes possibility.
Summary of the invention
The problem to be solved in the present invention is: existing microwave signal detects can't system integration frequency detecting and power detection, and the user needs simple structure, less volume and the microwave frequency that can detect online, power detector.
Technical scheme of the present invention is: based on the microwave detection system of semi-girder and direct-type power sensor, described microwave detection system comprises MEMS reconfigurable antenna, MEMS adjustable filter, control circuit and microwave detector, the MEMS reconfigurable antenna receives microwave signal, after the MEMS adjustable filter, obtain microwave signal input microwave detector to be measured, control circuit connects respectively MEMS reconfigurable antenna and MEMS adjustable filter
described microwave detector is provided with the measured signal transmission line on the GaAs substrate, four identical MEMS cantilever beam structures of structure, a merit is closed device and four the identical MEMS direct-type of structure microwave power detectors, the measured signal transmission line is the CPW transmission line, described CPW transmission line is made of signal wire and ground wire, microwave signal to be measured is by MEMS direct-type microwave power detector of measured signal transmission line input, four MEMS cantilever beam structures are divided into two pairs, symmetry is suspended from the signal wire top of measured signal transmission line, signal wire two of the same sides MEMS cantilever beam structure that wherein is positioned at the measured signal transmission line connects respectively a MEMS direct-type microwave power detector, two MEMS cantilever beam structures of opposite side symmetry are connected to respectively merit and close device, the output terminal that merit is closed device connects a MEMS direct-type microwave power detector.
As preferably, microwave detector is along measured signal transmission line direction, and centered by the distance L between the two pairs of MEMS cantilever beam structures 1/4 of Frequency point institute corresponding wavelength, described center frequency points refers to the center frequency points of the frequency detecting scope of described microwave frequency detector.
MEMS cantilever beam structure and the merit of microwave detector closed between device and MEMS direct-type microwave power detector and is connected by the CPW transmission line, and merit is closed between device and MEMS direct-type microwave power detector and is connected by the CPW transmission line; Cantilever beam structure comprises semi-girder and anchor district, is provided with insulating medium layer between the signal wire of the measured signal transmission line of semi-girder and below.
The merit of microwave detector is closed device and is comprised asymmetric coplanar stripline ACPS signal wire, ground wire and isolation resistance, and merit is closed and is asymmetric coplanar stripline ACPS signal wire between the input end of device and output terminal, and isolation resistance is arranged between two input ends.
A kind of detection method of above-mentioned microwave detection system based on semi-girder and direct-type power sensor receives microwave signal by the MEMS reconfigurable antenna, through obtaining microwave signal to be measured after the MEMS adjustable filter, in the input microwave detector; In microwave detector, microwave signal to be measured is transferred to through the measured signal transmission line MEMS direct-type microwave power detector that is positioned at the measured signal line end, detects the power P of microwave signal to be measured; Microwave signal to be measured from the measured signal transmission line through out-of-date, two MEMS cantilever beam structures that are positioned at signal wire the same side of measured signal transmission line are coupled out the microwave signal that two amplitudes equate, exist certain phase differential online, input respectively a MEMS direct-type microwave power detector, measure the microwave signal power P that is coupled out separately by cantilever beam structure 1, P 2Two MEMS cantilever beam structures that are positioned at described signal wire opposite side are coupled out two same microwave signals online, and input work is closed device, and to carry out vector synthetic, then input a MEMS direct-type microwave power detector, measures the power P by composite signal 3There is a phase differential that is directly proportional to microwave signal frequency to be measured in described two microwave signals
Figure BDA00002773337600021
Merit is closed the power P of the composite signal of device 3With this phase differential
Figure BDA00002773337600022
There is the relation of a cosine function,
Figure BDA00002773337600023
Four MEMS direct-type microwave power detectors detect the power P of microwave signal to be measured, the power P of microwave signal that the MEMS semi-girder is coupled out based on the Seebeck principle 1, P 2And merit is closed the power P of device composite signal 3Size, and with DC voltage form V, V 1, V 2And V 3The output measurement result, based on formula (1), the frequency of microwave signal to be measured is:
f = c 2 πL ϵ er arccos V 3 - 1 2 V 1 - 1 2 V 2 V 1 V 2 - - - ( 2 )
Wherein, c is the light velocity, ε erEffective dielectric constant for the CPW transmission line.
Further, change the voltage on drive electrode in MEMS reconfigurable antenna and MEMS adjustable filter by control circuit, thereby adjust the centre frequency of MEMS reconfigurable antenna and MEMS adjustable filter, to realize microwave signal frequency in a certain characteristic frequency situation and the detection of power.
The invention provides a kind of microwave frequency and power detecting system based on semi-girder and direct-type power sensor, microwave signal by the reception of MEMS reconfigurable antenna, after the MEMS adjustable filter, again through one section CPW transmission line, be transferred to the MEMS direct-type microwave power detector that is positioned at the CPW line end, can detect the power of microwave signal.Be positioned at CPW transmission line top and the identical MEMS semi-girder of four structures in a distance and be coupled out online the microwave signal that two pairs of amplitudes equate, have a phase differential, a supported signal of getting every centering wherein closes device through merit, and to carry out vector synthetic, by MEMS direct-type microwave power detector detect synthetic after the watt level of microwave signal and other two microwave signals.According to the size of the DC voltage of exporting, infer the frequency of measured signal.Can change voltage on drive electrode by control circuit, thereby adjust the centre frequency of MEMS reconfigurable antenna and MEMS adjustable filter, to realize microwave signal frequency in a certain characteristic frequency situation and the detection of power.
Microwave frequency and power detecting system based on semi-girder and direct-type power sensor of the present invention not only has novel structure, the advantage that is easy to measure, and can realize integrated to microwave signal frequency and power detection, and compatible with the GaAs monolithic integrated microwave circuit.
Description of drawings
Fig. 1 the present invention is based on the microwave frequency of semi-girder and direct-type power sensor and the structural representation of power detecting system.
Fig. 2 is the A-A' sectional view in Fig. 1.
Fig. 3 is the B-B' sectional view in Fig. 1.
Embodiment
As Fig. 1, the present invention includes MEMS reconfigurable antenna, MEMS adjustable filter, control circuit and microwave detector, the MEMS reconfigurable antenna receives microwave signal, after the MEMS adjustable filter, obtain microwave signal input microwave detector to be measured, control circuit connects respectively MEMS reconfigurable antenna and MEMS adjustable filter.The present invention is produced on GaAs substrate 1, and microwave detector comprises that co-planar waveguide CPW transmission line, four the identical MEMS cantilever beam structures of structure, merits close device and four the identical MEMS direct-type of structure microwave power detectors.The CPW transmission line is as the signal transmssion line of frequency detector of the present invention, be used for the transmission of microwave signal to be measured, and the transmission of closing signal between device and MEMS direct-type microwave power detector of MEMS cantilever beam structure, merit, the CPW transmission line is made of signal wire and ground wire.
In microwave detector, four identical MEMS semi-girders of structure are positioned at the top of the insulating medium layer 6 on the signal wire 2 of measured signal transmission line.When microwave signal process measured signal transmission line to be measured, be coupled out two amplitudes along measured signal transmission line two cantilever beam structures separated by a distance identical but have the microwave signal of certain phase differential, close the device vector through merit more synthetic, the poor cosine function relation that exists of the power of composite signal and microwave signal phase to be measured.In order to measure the size of the microwave signal power that is coupled out by cantilever beam structure, opposite side at the signal wire of measured signal transmission line has designed two identical cantilever beam structures of structure symmetrically, respectively be connected to MEMS direct-type microwave power detector, measure the signal power that cantilever beam structure is coupled out thereafter.Utilize the direct-type microwave power detector to detect the size of synthetic power, detect when finally realizing microwave signal frequency to be measured and power.
The specific embodiments of detection system of the present invention is as follows:
As Fig. 1-3, the present invention is arranged on GaAs substrate 1, comprises MEMS reconfigurable antenna, MEMS adjustable filter, control circuit and microwave detector, microwave detector comprises CPW signal wire 2, ground wire 3, MEMS semi-girder 4, anchor district 5, insulating medium layer 6, power splitter isolation resistance 7, ACPS signal wire 8, semiconductor thermocouple arm 9, tantalum nitride resistance 10, direct current IOB 11 and isolated dc capacitor 12.Be provided with MEMS reconfigurable antenna, MEMS adjustable filter, control circuit, co-planar waveguide CPW transmission line, four identical MEMS semi-girders, merits and close device and four MEMS direct-type microwave power detectors on gallium arsenide substrate 1.
MEMS reconfigurable antenna and MEMS adjustable filter are prior art, no longer describe in detail.
In microwave detector, the CPW transmission line comprises signal wire 2 and ground wire 3.The measured signal transmission line adopts the CPW transmission line, after microwave signal process MEMS adjustable filter to be measured by the reception of MEMS reconfigurable antenna, enter the CPW transmission line from the input end of measured signal transmission line, export a MEMS direct-type microwave power detector to by output terminal again, detect the power that obtains microwave signal to be measured.
The MEMS cantilever beam structure comprises semi-girder 4 and anchor district 5.Along the measured signal transmission line, two pairs in a distance the semi-girder 4 of L be suspended from the top of insulating medium layer 6 on the signal wire 2 of measured signal transmission line, as preferably, centered by distance L 1/4 of Frequency point institute corresponding wavelength, described center frequency points refers to the center frequency points of the frequency detecting scope of described microwave frequency detector.When measured signal from the signal wire of measured signal transmission line through out-of-date, four identical MEMS semi-girders 4 of structure are coupled out the microwave signal that two pairs of amplitudes equate, exist certain phase differential online, getting an input work in every pair of microwave signal, to close the device vector synthetic.In order to measure the microwave signal power that is coupled out by semi-girder 4, another in the every pair of microwave signal connects respectively a MEMS direct-type microwave power detector.
Merit is closed device and is comprised asymmetric coplanar stripline ACPS signal wire 8, ground wire 3 and isolation resistance 7.The effect that merit is closed device is that two microwave signal vectors that the MEMS cantilever beam structure is coupled out are synthesized.When microwave signal to be measured is passed through the signal wire of measured signal transmission line, because two semi-girders of the same side on signal wire have certain distance L, there is a phase differential that is directly proportional to microwave signal frequency to be measured in two microwave signals that are coupled out, described phase differential be that L is corresponding, L fixedly the time phase differential be a definite value, merit is closed the power P of the composite signal of device output 3Relation with a cosine function of this phase differential existence:
Figure BDA00002773337600051
Wherein, P 1, P 2Be respectively the power of the microwave signal that the MEMS semi-girder that is positioned at the same side on signal wire is coupled out.So the power that MEMS direct-type microwave power detector obtains is corresponding with microwave signal to be measured.
MEMS direct-type microwave power detector comprises semiconductor thermocouple arm 9, tantalum nitride resistance 10, direct current IOB 11 and isolated dc capacitor 12.Four MEMS direct-type microwave power detectors detect the power P of microwave signal to be measured, the power P of microwave signal that the MEMS semi-girder is coupled out based on the Seebeck principle 1, P 2And merit is closed the power P of device composite signal 3Size, and with DC voltage form V, V 1, V 2And V 3The output measurement result, based on formula (1), the frequency of microwave signal to be measured is:
f = c 2 πL ϵ er arccos V 3 - 1 2 V 1 - 1 2 V 2 V 1 V 2 - - - ( 2 )
Wherein, c is the light velocity, ε erEffective dielectric constant for the CPW transmission line.
Further, change the voltage on drive electrode in MEMS reconfigurable antenna and MEMS adjustable filter by control circuit, thereby adjust the centre frequency of MEMS reconfigurable antenna and MEMS adjustable filter, to realize microwave signal frequency in a certain characteristic frequency situation and the detection of power.
The preparation method who the present invention is based on the online microwave frequency detector of semi-girder and direct-type power sensor is:
1) prepare gallium arsenide substrate: select the semi-insulating GaAs substrate of extension, wherein extension N +The doping content of gallium arsenide is 10 18cm -3, its square resistance is 100～130 Ω/;
2) photoetching and isolate the N of extension +Gallium arsenide, the figure of the semiconductor thermocouple arm of formation thermoelectric pile;
3) anti-carve N +Gallium arsenide, forming its doping content is 10 17cm -3The semiconductor thermocouple arm of thermoelectric pile;
4) photoetching: removal will keep the photoresist in tantalum nitride place;
5) sputter tantalum nitride, its thickness are 1 μ m;
6) peel off;
7) photoetching: removal will keep the photoresist in the place of ground floor gold;
8) evaporation ground floor gold, its thickness is 0.3 μ m;
9) peel off, form CPW signal wire and ground wire, the anchor district of MEMS semi-girder;
10) anti-carve tantalum nitride, form tantalum nitride resistance and isolation resistance, its square resistance is 25 Ω/;
11) deposit silicon nitride: with plasma-enhanced chemical vapour deposition technique (PECVD) growth Thick silicon nitride medium layer;
12) photoetching and etch silicon nitride dielectric layer: be retained in the silicon nitride on the CPW signal wire of MEMS semi-girder below, and the medium silicon nitride of the isolated dc capacitor of MEMS direct-type microwave power detector;
13) deposit and photoetching polyimide sacrificial layer: apply the 1.6 thick polyimide sacrificial layer of μ m on gallium arsenide substrate, pit is filled up in requirement, and the thickness of polyimide sacrificial layer has determined that MEMS semi-girder and its below are in the distance between the silicon nitride medium layer on main line CPW; The photoetching polyimide sacrificial layer only keeps the sacrifice layer of semi-girder below;
14) evaporation titanium/gold/titanium, its thickness is
Figure BDA00002773337600061
Evaporation is used for the down payment of plating;
15) photoetching: removal will be electroplated local photoresist;
16) electrogilding, its thickness are 2 μ m;
17) remove photoresist: removing does not need to electroplate local photoresist;
18) anti-carve titanium/gold/titanium, the corrosion down payment forms CPW signal wire, ground wire, MEMS semi-girder, direct current IOB;
19) with this gallium arsenide substrate thinning back side to 100 μ m;
20) discharge polyimide sacrificial layer: developer solution soaks, and removes the polyimide sacrificial layer under the MEMS semi-girder, and deionized water soaks slightly, and the absolute ethyl alcohol dehydration is volatilized under normal temperature, dries.
Above-mentioned steps adopts the processes well known in the MEMS technology, no longer describes in detail.
Distinguish that to be whether the standard of structure of the present invention as follows:
The online microwave frequency detector detection system of microelectron-mechanical of the present invention comprises MEMS reconfigurable antenna, MEMS adjustable filter, control circuit and microwave detector, and microwave detector comprises four identical MEMS cantilever beam structures and four identical MEMS direct-type microwave power detectors.Microwave signal by the MEMS reconfigurable antenna receives after the MEMS adjustable filter, then through one section CPW transmission line, is transferred to the MEMS direct-type microwave power detector that is positioned at the CPW line end, can detect the power of microwave signal.When microwave signal process CPW transmission line to be measured, CPW transmission line top and the identical MEMS semi-girder of four structures in a distance two pairs of amplitudes that are coupled out online that are positioned at equate, exist the microwave signal of a phase differential, a supported signal of getting every centering wherein closes device through merit, and to carry out vector synthetic, detected the power of synthetic rear microwave signal by MEMS direct-type microwave power detector, the power of other two supported signals is detected by MEMS direct-type microwave power detector respectively simultaneously.The size of the DC voltage of exporting by detection, thus infer the frequency of measured signal, realize the detection of microwave signal frequency to be measured and power.Can change voltage on drive electrode by control circuit, thereby adjust the centre frequency of MEMS reconfigurable antenna and MEMS adjustable filter, to realize microwave signal frequency in a certain characteristic frequency situation and the detection of power.
The structure that satisfies above condition namely is considered as online microwave frequency detector and the detection method based on semi-girder and direct-type power sensor of the present invention.

Claims (7)

1. based on the microwave detection system of semi-girder and direct-type power sensor, it is characterized in that described microwave detection system comprises MEMS reconfigurable antenna, MEMS adjustable filter, control circuit and microwave detector, the MEMS reconfigurable antenna receives microwave signal, after the MEMS adjustable filter, obtain microwave signal input microwave detector to be measured, control circuit connects respectively MEMS reconfigurable antenna and MEMS adjustable filter
described microwave detector is provided with the measured signal transmission line on the GaAs substrate, four identical MEMS cantilever beam structures of structure, a merit is closed device and four the identical MEMS direct-type of structure microwave power detectors, the measured signal transmission line is the CPW transmission line, described CPW transmission line is made of signal wire and ground wire, microwave signal to be measured is by MEMS direct-type microwave power detector of measured signal transmission line input, four MEMS cantilever beam structures are divided into two pairs, symmetry is suspended from the signal wire top of measured signal transmission line, signal wire two of the same sides MEMS cantilever beam structure that wherein is positioned at the measured signal transmission line connects respectively a MEMS direct-type microwave power detector, two MEMS cantilever beam structures of opposite side symmetry are connected to respectively merit and close device, the output terminal that merit is closed device connects a MEMS direct-type microwave power detector.
2. the microwave detection system based on semi-girder and direct-type power sensor according to claim 1, it is characterized in that microwave detector is along measured signal transmission line direction, centered by distance L between the two pairs of MEMS cantilever beam structures 1/4 of Frequency point institute corresponding wavelength, described center frequency points refers to the center frequency points of the frequency detecting scope of described microwave frequency detector.
3. the microwave detection system based on semi-girder and direct-type power sensor according to claim 1 and 2, the MEMS cantilever beam structure that it is characterized in that microwave detector closes between device and MEMS direct-type microwave power detector with merit and is connected by the CPW transmission line, and merit is closed between device and MEMS direct-type microwave power detector and is connected by the CPW transmission line; Cantilever beam structure comprises semi-girder and anchor district, is provided with insulating medium layer between the signal wire of the measured signal transmission line of semi-girder and below.
4. the microwave detection system based on semi-girder and direct-type power sensor according to claim 1 and 2, the merit that it is characterized in that microwave detector is closed device and is comprised asymmetric coplanar stripline ACPS signal wire, ground wire and isolation resistance, merit is closed and is asymmetric coplanar stripline ACPS signal wire between the input end of device and output terminal, and isolation resistance is arranged between two input ends.
5. the microwave detection system based on semi-girder and direct-type power sensor according to claim 3, the merit that it is characterized in that microwave detector is closed device and is comprised asymmetric coplanar stripline ACPS signal wire, ground wire and isolation resistance, merit is closed and is asymmetric coplanar stripline ACPS signal wire between the input end of device and output terminal, and isolation resistance is arranged between two input ends.
6. the detection method of the described microwave detection system based on semi-girder and direct-type power sensor of a claim 1-5 any one, it is characterized in that receiving microwave signal by the MEMS reconfigurable antenna, through obtaining microwave signal to be measured after the MEMS adjustable filter, input in microwave detector; In microwave detector, microwave signal to be measured is transferred to through the measured signal transmission line MEMS direct-type microwave power detector that is positioned at the measured signal line end, detects the power P of microwave signal to be measured; Microwave signal to be measured from the measured signal transmission line through out-of-date, two MEMS cantilever beam structures that are positioned at signal wire the same side of measured signal transmission line are coupled out the microwave signal that two amplitudes equate, exist certain phase differential online, input respectively a MEMS direct-type microwave power detector, measure the microwave signal power P that is coupled out separately by cantilever beam structure 1, P 2Two MEMS cantilever beam structures that are positioned at described signal wire opposite side are coupled out two same microwave signals online, and input work is closed device, and to carry out vector synthetic, then input a MEMS direct-type microwave power detector, measures the power P by composite signal 3There is a phase differential that is directly proportional to microwave signal frequency to be measured in described two microwave signals
Figure FDA00002773337500021
Merit is closed the power P of the composite signal of device 3With this phase differential There is the relation of a cosine function,
Figure FDA00002773337500023
Four MEMS direct-type microwave power detectors detect the power P of microwave signal to be measured, the power P of microwave signal that the MEMS semi-girder is coupled out based on the Seebeck principle 1, P 2And merit is closed the power P of device composite signal 3Size, and with DC voltage form V, V 1, V 2And V 3The output measurement result, based on formula (1), the frequency of microwave signal to be measured is:
f = c 2 πL ϵ er arccos V 3 - 1 2 V 1 - 1 2 V 2 V 1 V 2 - - - ( 2 )
Wherein, c is the light velocity, ε erEffective dielectric constant for the CPW transmission line.
7. the detection method of the microwave detection system based on semi-girder and direct-type power sensor according to claim 6, it is characterized in that changing the voltage on drive electrode in MEMS reconfigurable antenna and MEMS adjustable filter by control circuit, thereby adjust the centre frequency of MEMS reconfigurable antenna and MEMS adjustable filter, to realize microwave signal frequency in a certain characteristic frequency situation and the detection of power.
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