A method and device for detecting millimeter wave power density on the surface of millimeter wave equipment

Abstract

The present invention discloses a method and device for detecting the millimeter wave power density on the surface of a millimeter wave device. The method utilizes the property that a molecule (such as monoterpenoid gas) with a characteristic rotation spectrum in the microwave or millimeter wave band will radiate microwaves after being excited by millimeter waves. The implementation method is to fill a micro-sized closed cavity that is transparent to both millimeter waves and microwaves with monoterpenoid gas, and then let the closed cavity scan the surface of the millimeter wave device, and at the same time use a horn antenna and a spectrometer to receive, detect and record the microwave fingerprint power spectrum radiated by the monoterpenoid gas after being excited by millimeter waves. The millimeter wave power density on the surface of the device can be calculated based on the intensity of the microwave fingerprint power spectrum. A device for detecting the millimeter wave power density on the surface of a millimeter wave device includes a closed cavity, a horn antenna, a radio frequency cable, and a spectrometer. The present invention has the characteristics of simple operation, rapid detection and low cost.

Description

Technical Field

[0001] The invention relates to a method and a device for detecting millimeter wave power density on the surface of a millimeter wave device. Background Art

[0002] With the development of millimeter wave technology and 5G mobile communication technology, more and more millimeter wave devices will appear around people, such as millimeter wave positioning radar, 5G millimeter wave mobile phones, millimeter wave communication base stations, etc. However, excessive millimeter wave radiation will cause certain harm to the human body, so there are a series of international standards requiring that the power density of millimeter wave equipment cannot exceed the standard value. At present, on the one hand, the cost of millimeter wave measurement equipment is very expensive, and on the other hand, the traditional method of using probes for near-field scanning is time-consuming and difficult to meet the needs of millimeter wave equipment production lines. Summary of the invention

[0003] In order to overcome the shortcomings of the prior art, the purpose of the present invention is to provide a method and device for detecting the millimeter wave power density on the surface of a millimeter wave device, which utilizes the response characteristics of certain molecules (such as monoterpenes or volatile oil gases) with characteristic rotation spectra in the microwave or millimeter wave band to millimeter waves to detect the millimeter wave power density on the surface of the millimeter wave device.

[0004] A method for detecting the millimeter wave power density on the surface of a millimeter wave device, wherein a closed cavity is placed on the surface of the millimeter wave device to be detected or at a certain distance, wherein a millimeter wave sensing material is contained in the closed cavity and can be excited by the millimeter wave and radiate a microwave signal, wherein the microwave signal is positively correlated with the millimeter wave power density, thereby obtaining the millimeter wave power density at the location of the closed cavity by detecting the microwave signal.

[0005] The sealed cavity is transparent to both millimeter waves and microwaves, that is, both millimeter waves and microwaves can penetrate the sealed cavity substantially without reflection and loss.

[0006] The millimeter wave sensing substance is monoterpenoid or volatile oil gas.

[0007] The millimeter wave sensing material includes rose essential oil, osmanthus essential oil, peppermint oil and clove oil.

[0008] The enclosed cavity or the millimeter wave device to be detected is relatively displaced so that the enclosed cavity scans the entire or partial surface of the millimeter wave device to be detected.

[0009] The enclosed cavity is a cube or a sphere, and its surface area is less than one tenth of the surface area of ​​the millimeter wave device to be detected.

[0010] The microwave signal is received by a horn antenna aligned with the closed cavity and transmitted to a spectrum analyzer via a radio frequency cable.

[0011] A device for detecting the millimeter wave power density on the surface of a millimeter wave device comprises a closed cavity, a horn antenna, a radio frequency cable, and a spectrum analyzer; the closed cavity is placed on the surface of the millimeter wave device to be detected or at a certain distance, a millimeter wave sensing material is contained in the closed cavity, the horn antenna is aligned with the closed cavity, and is connected to the spectrum analyzer via a radio frequency cable.

[0012] The enclosed cavity is a cube or a sphere, and its surface area is less than one tenth of the surface area of ​​the millimeter wave device to be detected.

[0013] The enclosed cavity or the millimeter wave device to be detected can be relatively displaced, so that the enclosed cavity scans the entire or partial surface of the millimeter wave device to be detected.

[0014] Beneficial effects of the present invention:

[0015] The present invention can detect and record the millimeter wave power density at the location of a micro-sized closed cavity in real time, and has the characteristics of low equipment cost, fast detection, etc. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 Schematic diagram of a closed cavity scanning on the surface of a 5G millimeter wave mobile phone;

[0017] Figure 2 A schematic diagram of the structure of a device for detecting millimeter wave power density on the surface of a millimeter wave device;

[0018] In the figure, there are 5G millimeter wave mobile phone 1, closed chamber 2, monoterpene gas 3, scanning track 4, horn antenna 5, RF cable 6, and spectrum analyzer 7. DETAILED DESCRIPTION

[0019] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0020] like Figure 1 As shown, the 5G millimeter wave mobile phone 1 is the device to be tested. The micro-enclosed cavity 2, which is transparent to millimeter waves and microwaves, is filled with monoterpene gas 3, which can also be volatile oil gas, including rose essential oil, osmanthus essential oil, peppermint oil, clove oil, etc. In order to detect the millimeter wave power density at all positions on the surface of the 5G millimeter wave mobile phone 1, a mechanical method will be used to move the enclosed cavity 2 along the scanning track 4. The length and direction of the scanning track 4 depend on the specific device size. The purpose is to allow all positions on the surface of the device to be tested to be detected and the scanning time is minimized.

[0021] Figure 2 The structure diagram of a device for detecting the millimeter wave power density on the surface of a millimeter wave device is shown in FIG. 5G millimeter wave mobile phone 1 is in working state. The millimeter wave it emits during operation excites the monoterpene gas 3 ( Figure 1), the excited monoterpene gas will radiate a microwave signal, which is received by the horn antenna 5 aimed at the closed cavity 2 and transmitted to the spectrometer 7 through the radio frequency cable 6. The working frequency band of the horn antenna covers the microwave fingerprint power spectrum band radiated by the monoterpene gas after being excited. The frequency meter 7 can thus detect the intensity of the microwave fingerprint power spectrum radiated by the monoterpene gas 3. Since the greater the millimeter wave power density, the greater the degree of excitation of the monoterpene gas 3, and the greater the intensity of the microwave fingerprint power spectrum radiated by it, the millimeter wave power density at the location of the closed cavity 2 and the microwave fingerprint power spectrum intensity detected by the spectrometer 7 will be positively correlated. The relationship between the two is calibrated in advance by experimental methods, and the millimeter wave power density at the current location of the closed cavity 2 can be inferred by comparing the calibrated relationship when the microwave fingerprint power spectrum is detected by the spectrometer 7.

[0022] The advantages of this embodiment include: Different from the traditional method of using a probe to detect the near field, the closed cavity 2 is transparent to both millimeter waves and microwaves, and its existence will hardly affect the original millimeter wave radiation intensity of the internal antenna of the 5G millimeter wave mobile phone 1, so the intensity value detected by this method will be closer to the actual value. In addition, under this method, the microwave fingerprint power spectrum is detected in real time, so the millimeter wave power density is also obtained in real time, while the traditional method requires measuring the electric field and magnetic field size first, and then calculating the power density, which is a complicated process. In addition, since microwave signals are detected, and the current cost of microwave detection equipment is much lower than that of millimeter wave detection equipment, this embodiment has a cost advantage.

[0023] The embodiments described above can be further combined or replaced, and the embodiments are only descriptions of preferred embodiments of the present invention, and do not limit the concept and scope of the present invention. Without departing from the design concept of the present invention, various changes and improvements made by ordinary technicians in the field to the technical solution of the present invention belong to the protection scope of the present invention. The protection scope of the present invention is given by the attached claims and any equivalents thereof.

Claims

1. A method for detecting the millimeter wave power density on the surface of a millimeter wave device, characterized in that: The sealed cavity is placed on the surface of the millimeter wave device to be detected or at a certain distance. The sealed cavity contains a millimeter wave sensing material that can be excited by the millimeter wave and radiate a microwave signal. The microwave signal is positively correlated with the power density of the millimeter wave, so the millimeter wave power density at the location of the sealed cavity is obtained by detecting the microwave signal. The millimeter wave sensing substance is monoterpenoid or volatile oil gas; The enclosed cavity is a cube or a sphere, and its surface area is less than one tenth of the surface area of ​​the millimeter wave device to be detected.

2. The method according to claim 1, characterized in that: The sealed cavity is transparent to both millimeter waves and microwaves, that is, both millimeter waves and microwaves can penetrate the sealed cavity substantially without reflection and loss.

3. The method according to claim 1, characterized in that: The millimeter wave sensing material includes rose essential oil, osmanthus essential oil, peppermint oil and clove oil.

4. The method according to claim 1, characterized in that: The enclosed cavity or the millimeter wave device to be detected is relatively displaced so that the enclosed cavity scans the entire or partial surface of the millimeter wave device to be detected.

5. The method according to any one of claims 1 to 4, characterized in that: The microwave signal is received by a horn antenna aligned with the closed cavity and transmitted to a spectrum analyzer via a radio frequency cable.

6. A device for detecting the millimeter wave power density on the surface of a millimeter wave device, characterized in that: It includes a sealed cavity, a horn antenna, a radio frequency cable, and a spectrum analyzer; the sealed cavity is placed on the surface of the millimeter wave device to be detected or at a certain distance, the sealed cavity contains a millimeter wave sensing material, the horn antenna is aligned with the sealed cavity, and is connected to the spectrum analyzer through a radio frequency cable; The millimeter wave sensing substance is monoterpenoid or volatile oil gas; The enclosed cavity is a cube or a sphere, and its surface area is less than one tenth of the surface area of ​​the millimeter wave device to be detected.

7. The device according to claim 6, characterized in that: The enclosed cavity or the millimeter wave device to be detected can be relatively displaced, so that the enclosed cavity scans the entire or partial surface of the millimeter wave device to be detected.

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