CN111896131A - Temperature sensor and system based on microstrip antenna - Google Patents
Temperature sensor and system based on microstrip antenna Download PDFInfo
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- CN111896131A CN111896131A CN202010777102.XA CN202010777102A CN111896131A CN 111896131 A CN111896131 A CN 111896131A CN 202010777102 A CN202010777102 A CN 202010777102A CN 111896131 A CN111896131 A CN 111896131A
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- temperature sensor
- dielectric substrate
- microstrip antenna
- antenna
- temperature
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/36—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
- H01Q1/38—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith formed by a conductive layer on an insulating support
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K7/00—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements
- G01K7/16—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q13/00—Waveguide horns or mouths; Slot antennas; Leaky-waveguide antennas; Equivalent structures causing radiation along the transmission path of a guided wave
- H01Q13/08—Radiating ends of two-conductor microwave transmission lines, e.g. of coaxial lines, of microstrip lines
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Waveguide Aerials (AREA)
Abstract
The invention relates to a temperature sensor and a system based on a microstrip antenna, in particular to the field of temperature detection. The medium substrate of the temperature sensor is arranged on one side of the grounding plate, and the radiation patch is arranged on one side of the medium substrate far away from the grounding plate; the radiating patch and the grounding plate are made of good metal conductor materials, and the dielectric substrate is made of thermal expansion materials. According to the working principle of the microstrip antenna, the antenna resonant frequency is abnormally sensitive to the distance between the butt-joint floor and the radiation patch, namely the thickness of the dielectric substrate influences the antenna resonant frequency; because the material of the dielectric substrate is a thermal expansion material, when the external temperature changes, the dielectric substrate is heated to expand, so that the distance between the grounding plate and the radiation patch changes, the resonance frequency between the radiation patch and the grounding plate changes, and the resonance frequency of the antenna shifts, and the sensing of the external environment temperature can be accurately finished through the corresponding relation between the change of the antenna resonance frequency shift and the temperature.
Description
Technical Field
The invention relates to the field of temperature detection, in particular to a temperature sensor and a system based on a microstrip antenna.
Background
A temperature sensor is a sensor that senses temperature and converts it into a usable output signal. The temperature sensor is the core part of the temperature measuring instrument and has a plurality of varieties. The sensor is classified into a thermal resistor and a thermocouple according to the characteristics of the sensor material and the electronic component.
The detection principle of the temperature sensor of the thermal resistor is that the resistance value of metal changes along with the temperature change, the temperature is measured by measuring the resistance and the relation between the resistance and the temperature, and the thermocouple temperature sensor is composed of two metal wires made of different materials and welded together at the tail end. The temperature of the heating point can be accurately known by measuring the ambient temperature of the unheated part.
Because thermal resistance temperature sensor and thermocouple temperature sensor all need heat through the metal with temperature sensor inside, the metal absorbs certain heat at the in-process of heating for this thermal resistance temperature sensor and thermocouple temperature sensor have great error to the measurement of temperature, and sensitivity is low.
Disclosure of Invention
The invention aims to provide a temperature sensor and a system based on a microstrip antenna aiming at the defects in the prior art, and aims to solve the problems that in the prior art, because the metal in the temperature sensor needs to be heated and absorbs certain heat in the heating process, the temperature measurement of the thermal resistance temperature sensor and the thermocouple temperature sensor has large errors and low sensitivity.
In order to achieve the above purpose, the embodiment of the present invention adopts the following technical solutions:
in a first aspect, the present application provides a microstrip antenna based temperature sensor, the temperature sensor comprising: the radiation patch is arranged on one side of the medium substrate far away from the grounding plate; the radiating patch and the grounding plate are made of good metal conductor materials, and the dielectric substrate is made of thermal expansion materials.
Optionally, the material of the radiating patch and the ground plate is at least one of silver and copper.
Optionally, the dielectric substrate, the radiation patch and the ground plate are all rectangular parallelepiped in shape.
Optionally, the material of the dielectric substrate is at least one of polymethyl methacrylate and silica gel.
Optionally, the dielectric substrate comprises a first portion and a second portion, the first portion and the second portion being of the same volume and shape.
Optionally, the material of the first portion is polymethyl methacrylate, and the material of the second portion is silica gel.
Optionally, the material of the first portion is silica gel, and the material of the second portion is polymethyl methacrylate.
Optionally, a groove is dug on a surface of the dielectric substrate on a side close to the radiation patch.
In a second aspect, the present invention further provides a temperature sensing system based on a microstrip antenna, where the temperature sensing system includes: a vector network analyzer for detecting a frequency spectrum of the temperature sensor, and the temperature sensor of any one of the first aspect.
The invention has the beneficial effects that: the invention provides a temperature sensor based on a microstrip antenna, which comprises: the radiation patch is arranged on one side of the medium substrate far away from the grounding plate; the radiating patch and the grounding plate are made of good metal conductor materials, and the dielectric substrate is made of thermal expansion materials. According to the working principle of the microstrip antenna, the antenna resonant frequency is abnormally sensitive to the distance between the butt-joint floor and the radiation patch, namely the thickness of the dielectric substrate influences the antenna resonant frequency; because the material of the dielectric substrate is a thermal expansion material, when the external temperature changes, the dielectric substrate is heated to expand, so that the distance between the grounding plate and the radiation patch changes, the resonance frequency between the radiation patch and the grounding plate changes, and the resonance frequency of the antenna shifts, and the sensing of the external environment temperature can be accurately finished through the corresponding relation between the change of the antenna resonance frequency shift and the temperature. Because the temperature measurement of the thermal property is converted into the change of the resonant frequency, the temperature measurement accuracy of the microstrip antenna temperature sensor is higher due to the fact that the resonant frequency is measured accurately in the prior art, and the effective dielectric constant and the effective thickness of the antenna resonant frequency between the medium substrates are very sensitive, the microstrip antenna temperature sensor has the advantage of high sensitivity, and the microstrip antenna temperature sensor is simple in structure, low in cost and light in weight.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
Fig. 1 is a schematic cross-sectional view of a temperature sensor of a microstrip antenna according to an embodiment of the present invention;
fig. 2 is a schematic cross-sectional view of a temperature sensor of another microstrip antenna according to an embodiment of the present invention;
fig. 3 is a schematic cross-sectional view of a temperature sensor of another microstrip antenna according to an embodiment of the present invention.
In the figure: 1-radiation patch; 2-a dielectric substrate; 3-ground plate.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiment is a metal plate embodiment of the present invention, and not all embodiments. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or the orientations or positional relationships that the products of the present invention are conventionally placed in use, and are only used for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.
Furthermore, the terms "horizontal", "vertical" and the like do not imply that the components are required to be absolutely horizontal or pendant, but rather may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.
In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In order to make the implementation of the present invention clearer, the following detailed description is made with reference to the accompanying drawings.
Example 1
Fig. 1 is a schematic cross-sectional view of a temperature sensor of a microstrip antenna according to an embodiment of the present invention; as shown in fig. 1, the present invention provides a temperature sensor based on a microstrip antenna, the temperature sensor including: the radiating patch comprises a radiating patch 1, a dielectric substrate 2 and an earth plate 3, wherein the dielectric substrate 2 is arranged on one side of the earth plate 3, and the radiating patch 1 is arranged on one side of the dielectric substrate 2 far away from the earth plate 3; the radiating patch 1 and the grounding plate 3 are made of good metal conductor materials, and the dielectric substrate 2 is made of thermal expansion materials.
The ground plate 3, the dielectric substrate 2 and the radiation patch 1 are sequentially arranged from bottom to top, the surface areas of the sections of the ground plate 3, the dielectric substrate 2 and the radiation patch 1 parallel to the horizontal plane can be the same or different, if the surface areas of the sections parallel to the horizontal plane are different, the surface areas of the ground plate 3 and the dielectric substrate 2 are larger than the surface area of the radiation patch 1, the dielectric substrate 2 is made of a thermal expansion material, so that the dielectric substrate 2 expands due to the heated volume, the distance between the ground plate 3 and the radiation patch 1 is changed, the ground plate 3 and the radiation patch 1 are made of good metal conductors, namely the ground plate 3 and the radiation patch 1 are made of metal, the metal has good conductivity, and the working principle of a microstrip antenna shows that the antenna resonant frequency is abnormally sensitive to the distance between the ground plate 3 and the radiation patch 1, namely, the thickness of the dielectric substrate 2 affects the resonant frequency of the antenna; because the material of the dielectric substrate 2 is a thermal expansion material, when the external temperature changes, the dielectric substrate 2 expands when heated, which causes the distance between the ground plate 3 and the radiation patch 1 to change, and causes the resonance frequency between the radiation patch 1 and the ground plate 3 to change, thereby causing the antenna resonance frequency to shift, and the sensing of the external environment temperature can be accurately completed through the corresponding relationship between the change of the antenna resonance frequency offset and the temperature. Because the temperature measurement of the thermal property is converted into the change of the resonant frequency, the temperature measurement accuracy of the microstrip antenna temperature sensor is higher due to the fact that the resonant frequency is measured accurately in the prior art, and the effective dielectric constant and the effective thickness of the antenna resonant frequency between the dielectric substrates 2 are sensitive, the microstrip antenna temperature sensor has the advantage of high sensitivity, and the microstrip antenna temperature sensor is simple in structure, low in cost and light in weight.
According to the transmission line model, the central frequency formula of the microstrip antenna is as follows:
where c is the speed of light in vacuum, LeffIs the effective current length of the antenna,
is the effective dielectric constant of the dielectric substrate 2.
Therefore, the effective current length L of the antenna is determined with the shape of the radiating patch 1effIt is determined that the center frequency of the antenna is mainly determined by the effective dielectric constant of the dielectric substrate 2, and the change of the distance between the radiating patch 1 and the ground plate 3 also causes the effective dielectric constant of the dielectric substrate 2
And correspondingly, the change is caused, and finally the resonant frequency of the antenna is changed, so that the influence factors of the resonant frequency of the antenna are the effective dielectric constant and the thickness of the dielectric substrate 2, and because the one-to-one corresponding relation between the resonant frequency of the antenna and the temperature can be obtained through experiments, the accurate sensing of the temperature can be realized by detecting the offset of the resonant frequency of the antenna.
Optionally, the material of the radiation patch 1 and the ground plate 3 is at least one of silver and copper.
The material of the radiation patch 1 may be silver, copper, or a mixed metal of silver and copper, and the material of the ground plate 3 may be silver, copper, or a mixed metal of silver and copper.
Alternatively, the dielectric substrate 2, the radiation patch 1 and the ground plate 3 are all rectangular parallelepiped in shape.
Optionally, the material of the dielectric substrate 2 is at least one of polymethyl methacrylate and silica gel.
The material of the dielectric substrate 2 may be polymethyl methacrylate, silica gel, or a mixture of silica gel and polymethyl methacrylate.
Example 2
Fig. 2 is a schematic cross-sectional view of a temperature sensor of another microstrip antenna according to an embodiment of the present invention; as shown in fig. 2, the dielectric substrate 2 optionally includes a first portion and a second portion, both of which are identical in volume and shape.
The first and second portions of the dielectric substrate 2 are identical in shape and geometric parameters and are arranged side by side, the first portion being one end of the dielectric substrate 2 and the second portion being the other end of the dielectric substrate 2.
The temperature sensor of another microstrip antenna in this embodiment is substantially the same as that in embodiment 1, except that the dielectric substrate 2 includes a first portion and a second portion, and the first portion and the second portion have the same volume and shape, that is, the first portion and the second portion of the dielectric substrate 2 each occupy half of the dielectric substrate 2.
Optionally, the material of the first portion is polymethyl methacrylate, and the material of the second portion is silica gel.
Optionally, the material of the first portion is silica gel, and the material of the second portion is polymethyl methacrylate.
The polymethylmethacrylate and the silica gel are each filled in half the volume of the dielectric substrate 2. The dielectric substrate 2 has a non-uniformity of temperature perception due to the difference in the coefficients of thermal expansion of the two thermal expansion materials.
It can be known from the working principle of the microstrip antenna that the resonant frequency of the antenna is very sensitive to the effective dielectric constant and thickness of the dielectric substrate 2. When the temperature of the external environment changes, the thermal expansion material in the medium substrate 2 is heated to expand, and the medium substrate 2 is filled with two materials with different thermal expansion coefficientsCauses a non-uniform variation in the thickness of the dielectric substrate 2, thereby more easily resulting in an effective dielectric constant of the dielectric substrate 2
Changes occur which ultimately cause a change in the resonant frequency of the antenna. Because the antenna resonant frequency corresponds to the temperature one by one, more sensitive sensing of the temperature can be realized by detecting the offset of the antenna resonant frequency. In addition, the temperature sensor is designed based on a microstrip antenna structure, so that the temperature sensor also has the advantages of low cost, light weight and easiness in integration.
Example 3
Fig. 3 is a schematic cross-sectional view of a temperature sensor of another microstrip antenna according to an embodiment of the present invention; as shown in fig. 3, optionally, a groove is dug on the surface of the dielectric substrate 2 near the side of the radiation patch 1.
The present embodiment provides another temperature sensor for a microstrip antenna, as shown in fig. 3, which is basically the same as embodiment 1 except that a groove is dug on a surface of the dielectric substrate 2 on a side close to the radiation patch 1.
A groove is dug in the surface of the dielectric substrate 2 close to the radiation patch 1, generally, the groove is arranged at the midpoint of the surface of the dielectric substrate 2 close to the radiation patch 1, that is, the cross section of the dielectric substrate 2 along the direction perpendicular to the horizontal plane is concave, and the thermal expansion material filled in the concave dielectric substrate 2 is at least one thermal expansion material of polymethyl methacrylate or silica gel. Since the cross-sectional shape of the dielectric substrate 2 is concave, when the temperature changes, the thermal expansion material filled in the dielectric substrate 2 expands in the thickness direction when heated, and the parts protruding from both sides also expand toward the middle. That is, when the temperature changes, not only the thickness of the dielectric substrate 2 but also the width of the dielectric substrate 2 may change.
It can be known from the working principle of the microstrip antenna that the resonant frequency of the antenna is very sensitive to the effective dielectric constant and thickness of the dielectric substrate 2. When the outside environment temperature occursWhen the temperature changes, the thickness and the width of the medium substrate 2 change because the cross section of the medium substrate 2 is concave, thereby the effective dielectric constant of the medium substrate 2 is more easily caused
Changes occur which ultimately cause a change in the resonant frequency of the antenna. Because the antenna resonant frequency corresponds to the temperature one by one, more sensitive sensing of the temperature can be realized by detecting the offset of the antenna resonant frequency. In addition, the temperature sensor is designed based on a microstrip antenna structure, so that the temperature sensor also has the advantages of low cost, light weight and easiness in integration.
Example 4
Based on the temperature sensor of any one of the microstrip antennas in embodiment 1, embodiment 2, and embodiment 3, the embodiment of the present application further provides a temperature sensing system based on the microstrip antenna, where the temperature sensing system includes: the temperature sensor of any one of above-mentioned vector network analyzer and, the vector network analyzer is used for detecting the frequency spectrum of temperature sensor.
When the external environment temperature changes, the thermal expansion material in the dielectric substrate 2 is heated to expand, so that the thickness of the dielectric substrate 2 changes, and the effective dielectric constant of the dielectric substrate 2 is caused to change
And correspondingly, the resonant frequency of the antenna is changed finally. The vector network analyzer is used for receiving and detecting the change of the resonant frequency. Finally, the sensing of the external environment temperature can be accurately finished through the change of the antenna resonant frequency offset detected by the vector network analyzer. The frequency drift of the microstrip antenna is very sensitive to the effective dielectric constant and the thickness of the dielectric substrate 2, so that the temperature sensing device has good performance.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. A microstrip antenna based temperature sensor, the temperature sensor comprising: the radiating patch comprises a radiating patch, a dielectric substrate and a grounding plate, wherein the dielectric substrate is arranged on one side of the grounding plate, and the radiating patch is arranged on one side of the dielectric substrate far away from the grounding plate;
the radiating patch and the grounding plate are made of good metal conductor materials, and the dielectric substrate is made of thermal expansion materials.
2. The microstrip antenna based temperature sensor according to claim 1, wherein the material of the radiating patch and the ground plane is at least one of silver and copper.
3. The microstrip antenna based temperature sensor according to claim 2, wherein the dielectric substrate, the radiating patch and the ground plane are all cuboid in shape.
4. The microstrip antenna based temperature sensor according to claim 3, wherein the dielectric substrate is at least one of polymethyl methacrylate and silica gel.
5. The microstrip antenna based temperature sensor according to claim 4, wherein the dielectric substrate comprises a first portion and a second portion, the first portion and the second portion being of the same volume and shape.
6. The microstrip antenna based temperature sensor according to claim 5, wherein the material of the first portion is polymethyl methacrylate and the material of the second portion is silicone.
7. The microstrip antenna based temperature sensor according to claim 5, wherein the material of the first portion is silica gel and the material of the second portion is polymethyl methacrylate.
8. The microstrip antenna based temperature sensor according to claim 3, wherein a recess is dug on a face of the dielectric substrate on a side close to the radiation patch.
9. A microstrip antenna based temperature sensing system, the temperature sensing system comprising: a vector network analyzer and a temperature sensor according to any one of claims 1 to 8, the vector network analyzer being configured to detect a frequency spectrum of the temperature sensor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010777102.XA CN111896131A (en) | 2020-08-05 | 2020-08-05 | Temperature sensor and system based on microstrip antenna |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010777102.XA CN111896131A (en) | 2020-08-05 | 2020-08-05 | Temperature sensor and system based on microstrip antenna |
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| Publication Number | Publication Date |
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| CN111896131A true CN111896131A (en) | 2020-11-06 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202010777102.XA Withdrawn CN111896131A (en) | 2020-08-05 | 2020-08-05 | Temperature sensor and system based on microstrip antenna |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112964936A (en) * | 2021-01-30 | 2021-06-15 | 天津理工大学 | Miniature antenna sensor sensitive to dielectric constant of surrounding environment |
-
2020
- 2020-08-05 CN CN202010777102.XA patent/CN111896131A/en not_active Withdrawn
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112964936A (en) * | 2021-01-30 | 2021-06-15 | 天津理工大学 | Miniature antenna sensor sensitive to dielectric constant of surrounding environment |
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Application publication date: 20201106 |
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