High-frequency power measurement device and power information acquisition mechanism

Abstract

Provided is a high-frequency power measurement device that is capable of measuring high-frequency power with high accuracy and can easily be applied to various frequency bands.　A high-frequency power measurement device 100: emits a measurement radio wave from an antenna 11 of a connection part 10 in such an orientation that the measurement radio wave becomes a TM wave; causes the TM wave of a measurement radio wave to be incident, at a Brewster angle θB, on an incidence surface 31a of a radio wave absorber 31 in a conversion comparison part 30A in which heat insulation properties with respect to the connection part 10 are maintained via a heat insulation part 20; and obtains, from a thermocouple 33, high-accuracy thermal change information derived from only the power of a measurement high-frequency signal. The power equal to the thermal change is identified using the value of a current flowing through a resistor 34, and the power of the measurement high-frequency signal is estimated. High-frequency power measurement in various frequency bands can be performed when the antenna 11 corresponding to the frequency is replaced and the arrangement of the incidence surface 31a of the radio wave absorber 31 is adjusted.

Description

High frequency power measuring device and power information acquisition mechanism

[0001] The present invention relates to a high-frequency power measuring device that is capable of measuring high-precision high-frequency power and is traceable to SI units, and a power information acquisition mechanism that acquires thermal change information for high-frequency power measurement.

[0002] As research and development into B5G / 6G progresses, there is an increasing need for radio station licenses in frequency bands above 110 GHz. Radio station licenses are issued by the Ministry of Internal Affairs and Communications after inspecting the antenna power and radio wave quality of the radio waves emitted from radio equipment, and for specific experimental test stations, licenses are issued by registered inspection companies who collect data on behalf of the operator and submit applications.

[0003] Antenna power is measured by attaching a radio frequency power meter to the output terminal of the radio, but commercially available radio frequency power meters are not guaranteed to be traceable to the International System of Units (SI). Furthermore, there is no way for national metrology institutes around the world to guarantee traceability, so manufacturers of radio frequency power meters are selling them with their own scales.

[0004] In Japan, a traceability system for radio frequency power standards has been established, using a calorimeter-type power measuring device (hereinafter simply referred to as a calorimeter) owned by the National Metrology Institute of Japan, part of the National Institute of Advanced Industrial Science and Technology, as the primary standard. A calorimeter is a device that absorbs incident radio frequency power into a load, converts it into heat, and measures radio frequency power by referencing the DC power that generates an equivalent amount of heat. Since the temperature change caused by incident radio frequency power is traceable to SI units, the measured radio frequency power is also traceable to SI units.

[0005] Examples of calorimeters include a coaxial line propagation type calorimeter that measures high frequency power by converting a signal propagating through a coaxial line into heat (see, for example, Non-Patent Document 1), and a waveguide propagation type calorimeter that measures high frequency power by converting a radio wave propagating through a waveguide into heat (see, for example, Non-Patent Document 2).

[0006] T. Inoue: “Broadband RF Power Standard for 7mm Coaxial Waveguide in Frequency Range of 10MHz-18GHz -Design and Fabrication-”, Electronics Technology Research Institute Bulletin, Vol. 64, No. 1, pp. 3-10. Y. Tojima, M. Kinoshita, H. Iida, and K. Fujii, “Calibrating Power Meters in the 140-220GHz Frequency Range Using an Absolute-Power Reference Calorimeter”, IEEE Trans. on IM, Vol. 70, 1002709, Nov. 2020.

[0007] However, the coaxial line propagation type and waveguide propagation type calorimeters described in Non-Patent Documents 1 and 2 have the following four main problems: (1) Heat generated from the signal source is transmitted through the waveguide to the thermocouple (temperature sensor), making accurate measurements impossible; (2) Conversely, heat generated in the absorber is transmitted through the waveguide and escapes to the outside, making accurate measurements impossible; and the absorber is less likely to increase in temperature, resulting in poor detection sensitivity; (3) A power meter must be manufactured for each operating frequency band of the waveguide (the frequency range of the fundamental mode); and (4) As the frequency increases, it becomes more difficult to process the absorber or thermocouple (temperature sensor) inside the waveguide.

[0008] As described above, conventional calorimeters are inefficient at converting high-frequency signals used for measurement into heat, resulting in reduced measurement accuracy. In addition, in order to accommodate the frequencies of high-frequency signals used for measurement, extensive modifications to the device or advanced manufacturing techniques are required, making it difficult to easily apply the device to various frequency bands.

[0009] SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a high frequency power measuring device that is capable of measuring high frequency power with high accuracy and can be easily applied to a variety of frequency bands.

[0010] In order to solve the above-mentioned problems, a high frequency power measuring device according to the present invention is a high frequency power measuring device comprising: a power information acquisition mechanism including: a connection part that is connected to a transmitting facility and that receives a high frequency signal for power measurement from the transmitting facility and radiates the high frequency signal for power measurement as a measurement radio wave into space; an insulating part that is a space through which the measurement radio wave radiated from the connection part propagates and that can ensure a sufficient insulating distance; and a conversion comparison part that receives the measurement radio wave that has arrived after passing through the insulating part with a radio wave absorber and converts it into heat, and acquires heat change information that allows a comparison of the heat change before and after the irradiation of the measurement radio wave; and a high frequency power calculation part that calculates the power of the high frequency signal based on the heat change information from the conversion comparison part in the power information acquisition mechanism, wherein the connection part transmits the linearly polarized wave of the measurement radio wave in an orientation that makes it a TM wave, and the conversion comparison part is positioned so that the incident surface of the radio wave absorber is inclined so that the TM wave of the measurement radio wave is incident at Brewster's angle.

[0011] In addition, in the above configuration, the conversion comparison unit may include a reflection means that receives a reflected wave reflected by the incident surface of the radio wave absorber and reflects it back to the incident surface of the radio wave absorber to promote re-absorption.

[0012] In the above configuration, the incident surface that receives the reflected wave from the radio wave absorber may be formed in a concave shape.

[0013] In addition, in the above configuration, the heat insulating section may be provided with an offset parabolic relay reflection means that receives the measurement radio waves radiated from the connection section and converges the reflected waves toward the radio wave absorber of the conversion comparison section.

[0014] In addition, in the above configuration, a dummy power information acquisition mechanism may be provided which has a dummy connection section, a dummy insulation section, and a dummy conversion comparison section that have the same structure as the power information acquisition mechanism, but which does not receive the high-frequency signal from the transmission equipment, and by placing the power information acquisition mechanism and the dummy power information acquisition mechanism in the same temperature environment, it is possible to offset temperature changes occurring in the surrounding area using temperature information of the radio wave absorber in the dummy conversion comparison section of the dummy power information acquisition mechanism.

[0015] In order to solve the above problems, the power information acquisition mechanism of the present invention is characterized by comprising: a connection unit that is connected to a transmitting equipment and that radiates a high-frequency signal for power measurement received from the transmitting equipment into space as a measurement radio wave; an insulating unit that is a space through which the measurement radio wave radiated from the connection unit propagates and that can ensure a sufficient insulating distance; and a conversion comparison unit that receives the measurement radio wave that arrives through the insulating unit using a radio wave absorber and converts it into heat, and acquires heat change information that allows the heat change before and after irradiation of the measurement radio wave to be compared.

[0016] In addition, in the above configuration, the connection section may transmit the linearly polarized waves of the measurement radio waves in a direction such that they become TM waves, and the radio wave absorber of the conversion comparison section may have one or more convex incident sections on an incident surface onto which the measurement radio waves are incident, the inclined surface being inclined so that the TM waves of the measurement radio waves are incident at Brewster's angle.

[0017] In order to solve the above problem, the high-frequency power measuring device of the present invention is characterized by comprising a power information acquisition mechanism having the above configuration, and a high-frequency power calculation unit that calculates the power of the high-frequency signal based on the thermal change information acquired by the power information acquisition mechanism.

[0018] The high-frequency power measuring device according to the present invention radiates measurement radio waves based on a high-frequency signal for power measurement from the connection section in a direction that produces TM waves, and causes the TM waves of the measurement radio waves to be incident at the Brewster angle on the incident surface of the radio wave absorber in the conversion / comparison section, which is thermally insulated from the connection section by the thermal insulation section. This allows highly accurate thermal change information derived solely from the power of the high-frequency signal for measurement to be obtained. Therefore, the high-frequency power measuring device according to the present invention enables highly accurate high-frequency power measurement through highly efficient thermal conversion. Furthermore, when the frequency of the high-frequency signal for power measurement is changed, the high-frequency power measuring device according to the present invention can easily accommodate a variety of frequency bands by simply adjusting the TM wave radiation function of the connection section and the positioning of the radio wave absorber in the conversion / comparison section, or by using a radio wave absorber made of a material whose Brewster angle does not change even at the changed frequency.

[0019] FIG. 11 is a schematic configuration diagram of a high-frequency power measuring device of a first embodiment equipped with a power information acquisition mechanism of a first configuration example. FIG. 12 is an explanatory diagram of a power measurement procedure by the high-frequency power measuring device. FIG. 13 is a schematic configuration diagram of a power information acquisition mechanism of a second configuration example. FIG. 14 is a schematic configuration diagram of a high-frequency power measuring device of a second embodiment equipped with a power information acquisition mechanism and a dummy information acquisition mechanism of a third configuration example. FIG. 15 is a schematic configuration diagram of a high-frequency power measuring device of a second embodiment including an input structure for a high-frequency signal. FIG. 16 is a schematic configuration diagram of a high-frequency power measuring device of a third embodiment equipped with a power information acquisition mechanism and a dummy information acquisition mechanism of a fourth configuration example. FIG. 17 is a schematic configuration diagram of a high-frequency power measuring device of a fourth embodiment equipped with a power information acquisition mechanism and a dummy information acquisition mechanism of a fifth configuration example. FIG. 18 is a schematic configuration diagram of a high-frequency power measuring device of a fifth embodiment using a parallelepiped temperature reference block. FIG. 19 is a schematic configuration diagram of a high-frequency power measuring device of a first embodiment using a modified power information acquisition mechanism of the second configuration example. FIG. 19 is a schematic configuration diagram of a high-frequency power measuring device of a sixth embodiment equipped with a power information acquisition mechanism of a sixth configuration example. FIG. 20 is a schematic configuration diagram of a high-frequency power measuring device of a seventh embodiment equipped with a power information acquisition mechanism of a seventh configuration example. 12 is a schematic configuration diagram of a high-frequency power measuring device according to a seventh embodiment, in which the power information acquisition mechanism of the seventh configuration example is modified and used; Fig. 13 is a schematic configuration diagram of a high-frequency power measuring device according to an eighth embodiment, in which the power information acquisition mechanism of the eighth configuration example is modified and used; Fig. 14 is a schematic configuration diagram of a high-frequency power measuring device according to an eighth embodiment, in which the power information acquisition mechanism of the eighth configuration example is modified and used;

[0020] Hereinafter, embodiments of a high frequency power device according to the present invention will be described in detail with reference to the accompanying drawings.

[0021] 1 shows a high-frequency power measuring device 100 according to the first embodiment, in which a power information acquisition mechanism 1A including a connection section 10, a heat insulating section 20, and a conversion / comparison section 30A is housed in a heat insulating jacket 40, which restricts heat transfer with the outside. The power information acquisition mechanism 1A of the first configuration example shown in FIG. 1 functions as a sensor that converts a high-frequency signal into heat change information, and a high-frequency power calculation section 50 calculates the power of the measurement high-frequency signal based on the heat change information as sensor output acquired from this power information acquisition mechanism 1A.

[0022] The connection unit 10 is connected to a transmission facility, receives a high-frequency signal for power measurement from the transmission facility, and emits it into space as a measurement radio wave via the antenna 11. By selecting an antenna 11 with a small reflection coefficient, it is possible to reduce "reflection," which is the main factor that hinders high-precision power measurement. Moreover, by replacing the antenna 11, it is possible to accommodate various frequency bands. Furthermore, the antenna 11 is positioned so that the linearly polarized measurement radio wave is transmitted in a direction that becomes a TM wave.

[0023] The heat insulating section 20 is a space through which the measurement radio waves radiated from the antenna 11 of the connection section 10 propagate, ensuring a sufficient insulating distance to the conversion comparison section 30A. By interposing this heat insulating section 20 between the connection section 10 and the conversion comparison section 30, heat transfer between the connection section 10 and the conversion comparison section 30A can be completely blocked. Because the thermal conductivity of air is extremely low at 0.024 W / (m·K), even if the temperature of the antenna 11 placed inside the insulating jacket 40 rises by about 1 degree, heat transfer to the conversion comparison section 30A is virtually eliminated as long as the heat insulating section 20 ensures a separation distance of about 1 cm. Thus, the heat insulating section 20 can be set to ensure a sufficient insulating distance depending on the degree of temperature rise in the connection section 10.

[0024] The conversion comparison unit 30A receives the measurement radio waves that have arrived through the heat insulating unit 20 on the incident surface 31a of the radio wave absorber 31, converts them into heat, and obtains heat change information that allows comparison of the heat change before and after irradiation of the measurement radio waves. B The wave absorber 31 is arranged so that the wave is incident at an angle of 0.05°, which significantly improves the absorption rate of the wave absorber 31. For example, when the measurement wave is irradiated perpendicularly, the absorption rate of the wave absorber 31 is about 99%. B When the radio wave is incident on the radio wave absorber 31 at 1000 W, the absorption rate of the radio wave absorber 31 is improved to 99.99%. In other words, the radio frequency power measuring device 100 including the power information acquisition mechanism 1A of this configuration example can convert the measurement radio wave into heat with high efficiency, thereby enabling high-precision radio frequency power measurement.

[0025] Moreover, the radio waves have Brewster angle θ depending on the frequency band. BHowever, by simply fine-tuning the inclination of the incident surface 31a of the radio wave absorber 31, it is possible to correspond to the frequency band of the radio wave to be measured, and therefore it is possible to easily apply it to various frequency bands. B By using a material that does not change the value of the Brewster angle θ for the wave absorber 31, it is possible to accommodate a wide frequency band of the measurement wave. B Alternatively, the incident light may be incident at a wavelength of 1000 nm.

[0026] Furthermore, in the conversion comparison section 30A, the temperature difference between the radio wave absorber 31 and the temperature reference block 32 is detected by a thermocouple 33 serving as a temperature sensor, and the potential difference corresponding to the detected temperature is monitored by the high frequency power calculation section 50. In the conversion comparison section 30A of this configuration example, before the radio wave absorber 31 receives the measurement radio wave, the resistor 34 serving as heating means is energized to stabilize the temperature of the radio wave absorber 31. Therefore, the temperature change caused by the reception of the measurement radio wave at the incident surface 31a of the radio wave absorber 31 is equal to the pre-irradiation power P before the measurement radio wave is irradiated. DC1 and the post-irradiation power P after the measurement radio wave is irradiated. DC2 The signal power P corresponding to the difference RF The temperature sensor is not limited to the thermocouple 33, but a thermo module (piezo element) or the like may also be used.

[0027] The high-frequency power calculation unit 50 includes a DC voltmeter 51 that monitors potential changes at the thermocouple 33 of the conversion comparison unit 30A, and a DC power supply 52 that supplies current to the resistor 34 of the conversion comparison unit 30A. While the adjustment of the power supply to the resistor 34 by the DC power supply 52 and the recording of measurements by the DC voltmeter 51 can be performed manually, measurement control by a measurement control means 53 enables efficient and accurate power measurement. To maintain a constant temperature inside the insulation jacket 40, a cooling element 54 is disposed at an appropriate location inside the insulation jacket 40. The operation of supplying a constant current from a constant current source 55 to this cooling element 54 to cool it to a constant temperature can also be automated by the measurement control means 53. The cooling principle of the cooling element 54 is not important as long as it can be cooled by current control. However, if a Peltier element is used, a heat dissipation mechanism or other measures are required to dissipate heat from the heat-generating surface facing the cooling surface to the outside of the insulation jacket 40.

[0028] Next, an example of a procedure for power measurement performed by the high frequency power measuring device 100 will be described with reference to FIG.

[0029] First, the DC power supply 52 starts to supply current to the resistor 34, heating the resistor 34. At the same time, the constant current source 55 starts to supply current to the cooling element 54. This stabilizes the temperatures of the radio wave absorber 31 and the temperature reference block 32, and an equilibrium state is achieved. Once the temperatures have stabilized, the pre-irradiation power P is calculated from the value of the current supplied from the DC power supply 52 to the resistor 34 and the resistance value of the resistor 34. DC1 (P = I 2 ×R). The temperature of the radio wave absorber 31 at this time can be detected as the electromotive force generated in the thermocouple 33, so the measurement value of the DC voltmeter 51 is stored as the temperature before irradiation.

[0030] Next, the measurement radio wave is irradiated to heat the radio wave absorber 31. Since the current value supplied from the DC power supply 52 to the resistor 34 is maintained, the power for heating the radio wave absorber 31 increases, and after irradiation, the power P DC2 The temperature stabilizes as follows. The signal power P RF is the post-irradiation power P DC2 and pre-irradiation power P DC1 The difference betweenRF =P DC2 -P DC1 ) but the post-irradiation power P DC2 Since the power value of is unknown, the signal power P RF However, the signal power P RF can be specified as the power required to raise the temperature of the radio wave absorber 31 from the pre-irradiation temperature to the post-irradiation temperature. Therefore, a current reduction operation is started to reduce the current supplied from the DC power supply 52 to the resistor 34, and the measurement value of the DC voltmeter 51 decreases.

[0031] As the current flowing through resistor 34 decreases, the temperature (DC voltage value) detected by thermocouple 33 decreases, and when the detected temperature becomes the same as the pre-irradiation temperature, the reduction in current from DC power supply 52 to resistor 34 is stopped and the current value is maintained as is. When the measurement value of DC voltmeter 51 exceeds the range in which it can be considered to be the same as the pre-irradiation temperature, the current supplied from DC power supply 52 to resistor 34 is finely adjusted, and when radio wave absorber 31 has reached the pre-irradiation temperature and stabilized, the current value at that time (current value from DC power supply 52 to resistor 34) is determined.

[0032] When the measurement value of the DC voltmeter 51 becomes the same as the pre-irradiation temperature, the current supplied from the DC power supply 52 to the resistor 34 becomes equal to the pre-irradiation power P DC1 The post-irradiation current value is lower than the reference current value for maintaining the signal power P. The difference current value between the reference current value and the post-irradiation current value is equal to the current value required to increase the temperature by the amount of the temperature increase caused by the absorption of the measurement radio wave by the radio wave absorber 31, by supplying power to the resistor 34. Therefore, RF is calculated from the differential current value and the resistance value of the resistor 34. Since the current and resistance are traceable to the SI unit system, the signal power P calculated from the current value and resistance value is RF is also traceable to the SI unit system.

[0033] If the measurement process procedure described above is automatically performed by the measurement control means 53 of the high frequency power calculation unit 50, high frequency power measurement can be performed efficiently.

[0034] The procedure for measuring the power by the high frequency power measuring device 100 is not limited to the above-mentioned method. For example, after the temperature of the radio wave absorber 31 is stabilized by supplying power from the DC power supply 52 to the resistor 34 and cooling the inside of the heat insulating jacket 40 by the cooling element 54 (pre-irradiation power P DC1 is determined), the measurement radio wave is irradiated to the radio wave absorber 31, and when a temperature change is detected (when the detected value of the thermocouple 33 changes), feedback is immediately applied to increase or decrease the current flowing from the DC power supply 52 to the resistor 34, so that the detected voltage of the thermocouple 33 is kept constant, and the pre-irradiation power P DC1 When the temperature after the radio wave irradiation is stabilized (when the detected voltage of the thermocouple 33 is stabilized), the current value from the DC power supply 52 to the resistor 34 (current value after irradiation) is determined, and the difference current value is calculated, and the signal power P RF When performing such feedback control, it is advisable to use a comparison circuit that compares the detection value of the reference thermocouple 33 with the detection value of the thermocouple 33 during irradiation of the measurement radio waves, and outputs an operation signal according to the difference.

[0035] The power information acquisition mechanism 1A of the first configuration example described above converts the TM wave into a TM wave at a Brewster angle θ B Since the wave absorber 31 is arranged so that the wave is incident at an angle of 0.05°, the absorption rate of the TM wave is extremely high. However, in reality, the TM wave cannot be completely absorbed, and reflected waves occur. In addition, the radio wave radiated from the antenna 11 may contain TE wave components, but the TE wave has a Brewster angle θ BSince there is no such a reflection, reflected waves occur. For this reason, reflected waves cannot be completely eliminated. Therefore, the conversion comparison unit 30B of the power information acquisition mechanism 1B of the second configuration example shown in FIG. 3 is provided with a reflector 35 as a reflection means that receives reflected waves reflected by the incident surface 31a of the radio wave absorber 31 and reflects them back to the incident surface 31a of the radio wave absorber 31 to promote re-absorption. It is desirable to use a metal with high surface conductivity and reflectivity and low absorption for the reflector 35. The insulating jacket 40 is provided with a thermocouple connection terminal 41, a resistor connection terminal 42, a cooling element connection terminal 43, etc. to prevent the insulation performance from being impaired by wiring routing, and the connection unit 10 is configured to supply the measurement high-frequency signal to the antenna 11 via a thermally insulated waveguide 12.

[0036] Furthermore, when measuring high-frequency power using the power information acquisition mechanisms 1A and 1B of the first and second configuration examples described above, the temperature equilibrium state before the irradiation of the measurement radio waves is stored, and the thermal change information after the irradiation of the measurement radio waves is acquired assuming that the temperature environment inside the insulating jacket 40 remains unchanged. However, if the temperature environment inside the insulating jacket 40 changes during the measurement of high-frequency power, this can cause errors in the measured high-frequency power. Therefore, the high-frequency power measuring device 200 of the second embodiment shown in FIG. 4 is equipped with a temperature compensation function to stabilize the measurement operation. Note that the high-frequency power calculation unit 50 is omitted from FIG. 4.

[0037] The high-frequency power measuring device 200 is a twin type that includes, in addition to the power information acquisition mechanism 1C of the third configuration example, a dummy power information acquisition mechanism 1C' having the same structure as the power information acquisition mechanism 1C, and the power information acquisition mechanism 1C and the dummy power information acquisition mechanism 1C' are placed in the same temperature environment, with the dummy power information acquisition mechanism 1C' performing the temperature compensation function.

[0038] The power information acquisition mechanism 1C includes a connection unit 10 and a heat insulating unit 20 similar to those of the power information acquisition mechanisms 1A and 1B, as well as a conversion comparison unit 30C similar to the conversion comparison unit 30B of the power information acquisition mechanism 1B. The conversion comparison unit 30C includes a converging reflector 36 having a concave incident surface that receives waves reflected from the radio wave absorber 31 as a reflection means. The radio waves reflected by the converging reflector 36 are converged and incident on a narrow area of ​​the incident surface 31a of the radio wave absorber 31, so that energy is concentrated in the narrow area, effectively promoting a temperature rise in the radio wave absorber 31. The radio wave absorber 31 of the conversion comparison unit 30C includes a base plate 311 made of a highly thermally conductive metal or the like and a radio wave absorbing layer 312 made of a highly conductive material or the like formed on the base plate 311. A thermocouple 33 is in contact with the highly thermally conductive base plate 311.

[0039] On the other hand, the dummy power information acquisition mechanism 1C' has a dummy connection section 10', a dummy heat insulation section 20', and a dummy conversion comparison section 30C' that are identical in structure to the power information acquisition mechanism 1C, but a reflection-suppressing terminator 13 is connected to the heat-insulating waveguide 12, so that the dummy power information acquisition mechanism 1C' does not receive high-frequency signals from the transmission equipment. Also, the temperature reference block 32 of the dummy conversion comparison section 30C' in the dummy power information acquisition mechanism 1C' is connected to the temperature reference block 32 of the conversion comparison section 30C in the power information acquisition mechanism 1C via a connection block 37 with high thermal conductivity. In other words, the temperature reference block 32 of the dummy conversion comparison section 30C' is at the same temperature as the temperature reference block 32 of the conversion comparison section 30C.

[0040] In the high-frequency power measuring device 200 configured as described above, if the same current is passed through the resistors 34 of the power information acquisition mechanism 1C and the dummy power information acquisition mechanism 1C' before supplying the measurement high-frequency signal to the power information acquisition mechanism 1C, the temperature of each wave absorber 31 rises by the same amount. At the same time, the cooling element 54 cools the inside of the insulating jacket 40, stabilizing the temperatures of the wave absorber 31 and the temperature reference block 32 of the power information acquisition mechanism 1C and the dummy power information acquisition mechanism 1C', and achieving equilibrium. In this equilibrium state, the voltage value obtained from the thermocouple 33 of the conversion comparison unit 30C and the thermocouple 33 of the dummy conversion comparison unit 30C' are the same. Even if the temperature environment inside the insulating jacket 40 changes, the voltage value obtained from the thermocouple 33 of the conversion comparison unit 30C and the thermocouple 33 of the dummy conversion comparison unit 30C' will show the same change. That is, the thermocouple 33 of the dummy conversion comparison unit 30C' in the dummy power information acquisition mechanism 1C' provides a voltage value that can be used as a reference for the equilibrium state before irradiation of the measurement radio waves, thereby offsetting temperature changes that occur in the surrounding area.

[0041] Therefore, in the radio frequency power measurement process by the radio frequency power measuring device 200, there is no need to store the voltage value (measured value of the DC voltmeter 51) obtained from the thermocouple 33 of the conversion comparison unit 30C in the power information acquisition mechanism 1C in the temperature equilibrium state before radio wave irradiation as the pre-irradiation temperature, and the voltage value (temperature information of the radio wave absorber 31) obtained from the thermocouple 33 of the dummy conversion comparison unit 30C' in the dummy power information acquisition mechanism 1C' is used as the pre-irradiation temperature (reference temperature before irradiation of the measurement radio waves). In other words, even if the current value to the resistor 34 and the measurement radio waves irradiated to the radio wave absorber 31 do not change, if the voltage value obtained from the thermocouple 33 of the conversion comparison unit 30C changes due to a change in the temperature environment inside the thermal insulation jacket 40, the exact same change also occurs in the voltage value obtained from the thermocouple 33 of the dummy conversion comparison unit 30C', and therefore error factors caused by temperature changes inside the thermal insulation jacket 40, etc. are canceled out. Therefore, in radio frequency power measurement using the radio frequency power measuring device 200 that includes not only the power information acquisition mechanism 1C but also the dummy power information acquisition mechanism 1C' having the same structure as the power information acquisition mechanism 1C, a temperature compensation function can be realized, enabling even more accurate radio frequency power measurement. Furthermore, the output of the thermocouple 33 in the conversion comparison unit 30C of the power information acquisition mechanism 1C and the output of the thermocouple 33 in the dummy conversion comparison unit 30C' of the dummy power information acquisition mechanism 1C' may be connected in reverse to monitor the current, and feedback control may be performed to adjust the value of the current supplied to the resistor 34 so that the monitored current becomes zero (so that the temperature of the radio wave absorber 31 in the conversion comparison unit 30C and the temperature of the radio wave absorber 31 in the dummy conversion comparison unit 30C' coincide), thereby canceling out temperature changes occurring in the surrounding area.

[0042] When measuring high frequency power with the high frequency power measuring device 200, as shown in Fig. 5, the device is housed together with the heat insulating jacket 40 in a radio wave shielding box 60, and a directional coupler 72 (or a power splitter) is connected to a signal input terminal 71 connected to the transmitting facility, which is then connected to the heat insulating waveguide 12 of the power information acquisition mechanism 1C and a reference power meter 73. Note that the high frequency power calculation unit 50 is omitted from Fig. 5.

[0043] The directional coupler 72 inputs a portion of the energy of the measurement radio frequency signal to the reference wattmeter 73, making it possible to monitor the measurement radio frequency signal supplied to the power information acquisition mechanism 1C. Alternatively, a power splitter may be used instead of the directional coupler 72, and a portion of the energy of the measurement radio frequency signal may be input to the reference wattmeter 73, thereby monitoring the measurement radio frequency signal supplied to the power information acquisition mechanism 1C. A dummy directional coupler 72' and a dummy power supply 73' are also provided in the dummy power information acquisition mechanism 1C', and a terminator 13 for suppressing reflections is connected to the input port of the dummy directional coupler 72'.

[0044] In the first and second embodiments of the high-frequency power measuring devices 100 and 200 described above, the heat insulating section 20 of the power information acquisition mechanism 1A-1C is a space for ensuring the distance between the antenna 11, which is arranged in a substantially straight line, and the radio wave absorber 31. Therefore, increasing the distance to improve thermal insulation requires making the insulating jacket 40 longer, thinner, and larger. Therefore, in the third embodiment of the high-frequency power measuring device 300 shown in FIG. 6 , the heat insulating section 20D of the power information acquisition mechanism 1D of the fourth configuration example receives the measurement radio waves emitted from the connection section 10, turns the direction of the measurement radio waves by approximately 90 degrees, and is provided with a relay reflector 21, which is an offset parabolic relay reflection means that converges the reflected waves toward the incident surface 31a of the radio wave absorber 31 of the conversion / comparison section 30C. The heat insulating section 20D' of the dummy power information acquisition mechanism 1D' has a similar structure and is equipped with a relay reflector 21. The high-frequency power calculation section 50 is omitted from FIG. 6 .

[0045] By using this relay reflector 21, the measurement radio waves radiated from the antenna 11 are converged in a narrow area on the incident surface 31a of the radio wave absorber 31, so that the energy is concentrated in a narrow area, which is highly effective in promoting a temperature rise in the radio wave absorber 31. Also, since it is not necessary to arrange the antenna 11 and the radio wave absorber 31 in a straight line, the degree of freedom in arrangement of the antenna 11 and the radio wave absorber 31 can be increased. In addition, by finely adjusting the reflection angle of the relay reflector 21 according to the frequency of the measurement radio waves, the measurement radio waves can be focused at Brewster's angle θ without changing the arrangement of the incident surface 31a of the radio wave absorber 31. BThis makes it possible to more easily apply the method to power measurements in a variety of frequency bands.

[0046] In the high-frequency power measuring devices 200, 300 of the second and third embodiments described above, the power information acquisition mechanisms 1C, 1D and the dummy power information acquisition mechanisms 1C', 1D' are each independent structures and are connected to the respective temperature reference blocks 32, 32 via the highly thermally conductive connecting block 37 to match the reference temperatures, but this is not limiting. For example, the power information acquisition mechanisms and the dummy power information acquisition mechanisms may share a single temperature reference block without using the connecting block 37. Therefore, in the fourth embodiment of the high-frequency power measuring device 200' shown in Figure 7, the conversion comparison unit 30D of the power information acquisition mechanism 1E of the fifth configuration example and the dummy conversion comparison unit 30D' of the dummy power information acquisition mechanism 1E' share a rectangular temperature reference block 32', and the radio wave absorber 31 for the conversion comparison unit 30D and the radio wave absorber 31 for the dummy conversion comparison unit 30D' are attached to the opposing, approximately parallel first mounting surface 32a' and second mounting surface 32b', respectively.

[0047] In this high-frequency power measuring device 200', the incident surface 31a of the radio wave absorber 31 for the conversion comparison unit 30D and the incident surface 31a of the radio wave absorber 31 for the dummy conversion comparison unit 30D' are opposite to each other, so the direction in which measurement radio waves are transmitted from the connection unit 10 of the power information acquisition mechanism 1E to the conversion comparison unit 30D via the insulation unit 20 is opposite to the direction in which virtual dummy measurement radio waves are transmitted from the dummy connection unit 10' of the dummy power information acquisition mechanism 1E' to the dummy conversion comparison unit 30D' via the dummy insulation unit 20'. Then, by positioning the antenna 11 of the connection part 10 and the antenna 11 of the dummy connection part 10' so that the central axis of the measurement radio wave transmitted from the connection part 10 of the power information acquisition mechanism 1E and the central axis of the dummy radio wave virtually transmitted from the dummy connection part 10' of the dummy power information acquisition mechanism 1E' are parallel, the angle of incidence with respect to the incident surface 31a of the radio wave absorber 31 in the conversion comparison part 30D can be made to match the angle of incidence with respect to the incident surface 31a of the radio wave absorber 31 in the dummy conversion comparison part 30D'.

[0048] Therefore, in the high frequency power measuring device 200′, the TM wave of the measurement radio wave transmitted from the connection part 10 of the power information acquisition mechanism 1E strikes the incident surface 31a of the radio wave absorber 31 in the conversion comparison part 30D at a Brewster angle θ B By arranging the temperature reference block 32′ so that the TM wave of the dummy measurement radio wave virtually transmitted from the dummy connection unit 10′ of the dummy power information acquisition mechanism 1E′ is incident at an angle of Brewster angle θ B The angle of incidence is determined by the angle of incidence, and the temperature compensation function of the dummy power information acquisition mechanism 1E' can be applied. Furthermore, if a converging reflector 36 is provided as a reflecting means in the conversion comparison unit 30D and the dummy conversion comparison unit 30D', the effect of promoting a temperature rise in the radio wave absorber 31 can be enhanced, which is useful for improving measurement accuracy.

[0049] In the high-frequency power measuring device 200' of the fourth embodiment described above, the conversion comparison unit 30D of the power information acquisition mechanism 1E and the dummy conversion comparison unit 30D' of the dummy power information acquisition mechanism 1E' share a rectangular parallelepiped temperature reference block 32'. Therefore, the central axis of the measurement radio waves transmitted from the connection unit 10 of the power information acquisition mechanism 1E cannot be aligned with the central axis of the dummy measurement radio waves virtually transmitted from the dummy connection unit 10' of the dummy power information acquisition mechanism 1E'. Therefore, FIG. 8 shows a high-frequency power measuring device 200' of the fifth embodiment, which uses a parallelepiped temperature reference block 32'' that can align the central axis of the measurement radio waves transmitted from the connection unit 10 of the power information acquisition mechanism 1E with the central axis of the dummy measurement radio waves virtually transmitted from the dummy connection unit 10' of the dummy power information acquisition mechanism 1E'.

[0050] In the temperature reference block 32" of the high frequency power measuring device 200", the radio wave absorber 31 in the conversion comparison unit 30D of the power information acquisition mechanism 1E and the radio wave absorber 31 in the dummy conversion comparison unit 30D' of the dummy power information acquisition mechanism 1E' are attached to the substantially parallel first attachment surface 32a" and second attachment surface 32b", respectively. At this time, the TM wave of the measurement radio wave transmitted from the connection unit 10 of the power information acquisition mechanism 1E strikes the incident surface 31a of the radio wave absorber 31 in the conversion comparison unit 30D at a Brewster angle θ BWhen the first mounting surface 32a" is arranged so that the TM wave of the dummy measurement radio wave that is virtually transmitted from the dummy connection portion 10' of the dummy power information acquisition mechanism 1E' is incident on the incident surface 31a of the radio wave absorber 31 attached to the second mounting surface 32b" of the temperature reference block 32" at a Brewster angle θ B The incident angle is

[0051] Furthermore, the first and second mounting surfaces 32a" and 32b" of the temperature reference block 32" have sufficient surface area to enable adjustment of the mounting position of the radio wave absorber 31 in the conversion comparison unit 30D and the mounting position of the radio wave absorber 31 in the dummy conversion comparison unit 30D'. Even if the antenna 11 of the connection unit 10 and the antenna 11 of the dummy connection unit 10' are arranged opposite each other so that the central axis of the measurement radio wave transmitted from the connection unit 10 of the power information acquisition mechanism 1E coincides with the central axis of the dummy measurement radio wave virtually transmitted from the dummy connection unit 10' of the dummy power information acquisition mechanism 1E', the radio wave absorber 31 for the conversion comparison unit 30D and the radio wave absorber 31 for the dummy conversion comparison unit 30D' can be mounted in appropriate positions on the first and second mounting surfaces 32a" and 32b", respectively.

[0052] Therefore, in the high frequency power measuring device 200″, the TM wave of the measurement radio wave transmitted from the connection unit 10 of the power information acquisition mechanism 1E strikes the incident surface 31a of the radio wave absorber 31 in the conversion comparison unit 30D at the Brewster angle θ B By arranging the temperature reference block 32″ so that the TM wave of the dummy measurement radio wave virtually transmitted from the dummy connection unit 10′ of the dummy power information acquisition mechanism 1E′ is incident at an angle of Brewster angle θ B The incident angle is set to 1 / 200, and the temperature compensation function of the dummy power information acquisition mechanism 1E' can be applied. Furthermore, if a converging reflector 36 is provided as a reflecting means in the conversion comparison unit 30D and the dummy conversion comparison unit 30D', the effect of promoting a temperature rise in the radio wave absorber 31 can be enhanced, which is useful for improving measurement accuracy.

[0053] In addition, if the antenna 11 of the connection unit 10 and the antenna 11 of the dummy connection unit 10' are arranged opposite each other so that the central axis of the measurement radio waves transmitted from the connection unit 10 of the power information acquisition mechanism 1E and the central axis of the dummy measurement radio waves virtually transmitted from the dummy connection unit 10' of the dummy power information acquisition mechanism 1E' are aligned, as in the high-frequency power measuring device 200'', the separation distance between the incident surface 31 a of the radio wave absorber 31 in the conversion comparison unit 30D and the incident surface 31 a of the radio wave absorber 31 in the dummy conversion comparison unit 30D' becomes large, and the insulating jacket 40 that houses the power information acquisition mechanism 1E and the dummy power information acquisition mechanism 1E' ends up being slightly elongated in the direction of transmission of the measurement radio waves.

[0054] However, if the four side walls of the heat insulating jacket 40 have a planar shape parallel to the transmission direction of the measurement radio waves, the cross section (cross section perpendicular to the transmission direction of the measurement radio waves) will be approximately rectangular. Therefore, the angles formed by the four side walls of the heat insulating jacket 40 and the four side surfaces of the temperature reference block 32″ facing the four side walls (for example, the first mounting surface 32a″) are Brewster angles θ B The angle formed by the first side surface 32c'' and the second mounting surface 32b'' parallel to the first side surface 32c'' is the Brewster angle θ B By making the temperature reference block 32'' into a parallelepiped shape such that the four sides of the temperature reference block 32'' (second side 32d'' being the first side 32d'', third side 32e'' being perpendicular to the first and second side 32c'', 32d'' and the fourth side 32f'' being the opposite side to the third side 32e'' and parallel to the first and second side 32c'', 32d'') are approximately parallel to the inner surfaces of the four side walls of the insulating jacket 40, it is possible to place the four sides of the temperature reference block 32'' close to the inner surfaces of the four side walls of the insulating jacket 40. In other words, since the cross-sectional area of ​​the insulating jacket 40 of the high frequency power measuring device 200'' perpendicular to the transmission direction of the measurement radio waves can be reduced, there is an advantage that the high frequency power measuring device 200'' can be configured with a long and narrow insulating jacket 40 that is suitable for an installation location for the insulating jacket 40 where there is ample space in the width but not in the height or depth.

[0055] In the high-frequency power measuring devices 200, 300, 200', and 200'' of the second to fifth embodiments described above, temperature compensation is performed and measurement accuracy is improved by providing dummy power information acquisition mechanisms 1C', 1D', and 1E' corresponding to the power information acquisition mechanisms 1C, 1D, and 1E. However, as with the power information acquisition mechanisms 1A and 1B, the measurement radio waves are not transmitted at the Brewster angle θ B High-accuracy high-frequency power measurement is possible if the measurement radio waves can be made incident on the radio wave absorber 31 and converted into heat with high efficiency. For example, as shown in FIG. 9 , which is a modified example of the high-frequency power measurement device 100 according to the first embodiment, high-accuracy high-frequency power measurement is possible even with a configuration in which only a power information acquisition mechanism 1B′ including a conversion comparison unit 30B′ in which a converging reflector 36 is provided instead of the reflector 35 in the conversion comparison unit 30B of the second configuration example is housed in a heat insulating jacket 40.

[0056] Furthermore, to resolve the problems (1) and (2) of the coaxial line propagation type calorimetry and the waveguide propagation type calorimetry described in Non-Patent Documents 1 and 2, simply improving the thermal insulation of the temperature sensor used to detect temperature changes can acquire power information with sufficient power measurement accuracy. That is, as shown in FIG. 10 , even in the sixth configuration example of the conversion / comparison unit 30E, in which the incident surface 31a of the radio wave absorber 31 is positioned so as to receive the central axis of the measurement radio wave from the connection unit 10 substantially perpendicularly, highly accurate power information can be acquired by providing a thermal insulation unit 20 that ensures a sufficient thermal insulation distance between the connection unit 10 and the conversion / comparison unit 30E. Furthermore, this power information acquisition mechanism 1F has a simple structure suitable for miniaturization and cost reduction. Therefore, the sixth embodiment of the high-frequency power measurement device 400, in which the power information acquisition mechanism 1F is housed in a thermal insulation jacket 40 and the high-frequency power calculation unit 50 calculates the power of the measurement high-frequency signal based on the power information from the power information acquisition mechanism 1F, can be provided with sufficient power measurement accuracy, while also being lightweight, compact, and inexpensive.

[0057] If the radio wave absorbing layer 312 of the radio wave absorber 31 in the conversion comparison unit 30E of the high frequency power measuring device 400 does not have good radio wave absorption properties, it may be impossible to obtain highly accurate power information. In such a case, in order to improve the radio wave absorption properties, the TM wave of the measurement radio wave is adjusted to the Brewster angle θB It is effective to make the TM wave of the measurement radio wave incident on the incident surface 31a of the radio wave absorber 31 at a Brewster angle θ B The seventh configuration example of the power information acquisition mechanism 1G is configured to include a conversion comparison unit 30F using a radio wave absorber 37 having one convex incident portion on which an inclined surface is formed so that the incident angle is inclined.

[0058] The radio wave absorber 81 of the conversion comparison unit 30F is provided with a radio wave absorbing block 812 made of a highly conductive material or the like on a flat block mounting surface 811a on the heat insulating section 20 side of a base plate 811. The inclined surface 812a formed on the heat insulating section 20 side of the radio wave absorbing block 812 absorbs the TM wave of the measurement radio wave at a Brewster angle θ B That is, in the power information acquisition mechanism 1G, the TM wave of the measurement radio wave is incident at the Brewster angle θ by simply arranging the block mounting surface 811a of the base plate 811 of the radio wave absorber 81 in a direction perpendicular to the transmission direction of the measurement radio wave without tilting the temperature reference block 32. B The wave absorber 81 can be made to enter the incident surface 81a of the wave absorber 81 at a high angle, and the wave absorption of the wave absorber 81 can be improved, so that highly accurate power information can be obtained. B ", and attaching this attachment surface 812b to the block attachment surface 811a of the base plate 811 to form the radio wave absorber 81. Alternatively, a high conductivity material or the like may be thickly laminated on the base plate 811 so that the angle formed with the block attachment surface 811a is "90°-θ B The incident surface 81a of the radio wave absorber 81 may be formed by cutting off unnecessary portions so as to form an inclined surface 812a in which the angle .theta.

[0059] The power information acquisition mechanism 1G is housed in a heat insulating jacket 40, and the high-frequency power calculation unit 50 calculates the power of the measurement high-frequency signal based on the power information from the power information acquisition mechanism 1G. In this high-frequency power measuring device 500, the wave absorber 81 is provided with an incident surface 81a to enhance the absorption of the measurement wave, thereby sufficiently improving the power measurement accuracy and providing a lightweight, compact, and inexpensive device. Furthermore, as shown in FIG. 12 , a seventh embodiment of the high-frequency power measuring device 500′ is provided with a conversion / comparison unit 30F′ equipped with a converging reflector 36 as a reflecting means. This enhances the effect of promoting the temperature rise of the wave absorber 81, which is useful for further improving the measurement accuracy. Furthermore, by changing the frequency of the measurement wave, the Brewster's θ B When the Brewster angle θ is changed, the TM wave of the measurement radio wave after the frequency change can be adjusted by simply fine-tuning the inclination of the block mounting surface 811a of the base plate 811 of the radio wave absorber 81. B Therefore, it is not necessary to tilt the temperature reference block 32 or the like significantly.

[0060] The power information acquisition mechanisms 1G, 1G' of the high frequency power measuring devices 500, 500' of the seventh embodiment described above use a radio wave absorber 81 having a radio wave absorbing block 812 that functions as a single convex incident portion, and therefore, due to the large volume of the radio wave absorbing block 812, the temperature rise of the entire radio wave absorber 81 may be limited to a very small range, making it impossible to acquire highly accurate power information. Therefore, the high frequency power measuring device 600 of the eighth embodiment shown in FIG. 13 converts the TM wave of the measurement radio wave into a TM wave at a Brewster angle θ B The eighth configuration example of the power information acquisition mechanism 1H is configured to include a conversion comparison unit 30H using a radio wave absorber 82 having a plurality of convex incident portions on which inclined surfaces are formed to cause the radio wave to be incident at an angle.

[0061] The wave absorber 82 of the conversion comparison unit 30H has a mounting surface 822a of a wave absorbing block 822 made of a highly conductive material or the like attached to a flat block mounting surface 821a on the heat insulating unit 20 side of a base plate 821. This wave absorbing block 822 has a substantially flat protruding reference surface 822a' arranged perpendicular to the incident direction of the measurement wave and has a plurality of convex incident portions 822b protruding toward the heat insulating unit 20 side. The TM wave of the measurement wave is incident on these convex incident portions 822b at Brewster's angle θ B Specifically, each of the convex incident portions 822b makes the TM wave of the measurement radio wave incident at a Brewster angle θ B and a non-inclined surface 822b2 that is arranged substantially parallel to the measurement radio wave and onto which the measurement radio wave is difficult to be incident. The convex incident portion 822b has a series of inclined surfaces 822b1 that are continuously formed, and the TM wave of the measurement radio wave is incident at a Brewster angle θ B The incident surface 82a is formed so that the incident light is incident at an angle of 90°-θ between the inclined surface 822b1 of each convex incident portion 822b of the radio wave absorbing block 822 and the protruding reference surface 822a'. B ", the TM wave of the measurement radio wave is incident on the inclined surface 822b1 of each convex incident portion 822b at the Brewster angle θ B It can be made incident at

[0062] In the power information acquisition mechanism 1H of the eighth configuration example, the TM wave of the measurement radio wave is incident on the incident surface 82a of the radio wave absorber 82 at the Brewster angle θ B Since the measurement signals can be incident at a constant angle, the radio wave absorption of the radio wave absorber 82 can be improved, and highly accurate power information can be obtained. Moreover, by having the multiple convex incident portions 822b protrude from the protruding reference surface 822a', the inclined surface 822b1 can be formed in sections like a Fresnel lens, so the amount of protrusion of the convex incident portions 822b can be reduced, thereby reducing the volume of the radio wave absorber 82 and sufficiently increasing the temperature rise due to absorption of the measurement radio waves, allowing highly accurate power information to be obtained. The high frequency power measuring device 600, in which the power information acquisition mechanism 1H is housed in a heat insulating jacket 40 and the high frequency power calculation unit 50 calculates the power of the measurement high frequency signal based on the power information from the power information acquisition mechanism 1H, can be provided with sufficiently high power measurement accuracy, is lightweight, compact, and inexpensive.

[0063] The power information acquisition mechanism 1H of the high frequency power measuring device 600 of the eighth embodiment described above uses the radio wave absorbing block 822 having the convex incident portion 822b continuously formed thereon and having a right-angled triangular cross section made up of the inclined surface 822b1 and the non-inclined surface 822b2. However, the shape of the convex incident portion is not limited to this. For example, a high frequency power measuring device 600', which is a modification of the high frequency power measuring device 600 of the eighth embodiment, can measure the TM wave of the measurement radio wave at a Brewster angle θ as shown in FIG. B The eighth configuration example of the power information acquisition mechanism 1H' is configured with a conversion comparison unit 30H' that has been modified to use a radio wave absorber 83 that has multiple convex incident portions with continuous inclined surfaces that form the inclination at which the radio wave is incident.

[0064] The wave absorber 83 of the conversion comparison unit 30H' has a base plate 831 having a flat block mounting surface 831a on the heat insulating unit 20 side of the base plate 831, and a mounting surface 832a of the wave absorbing block 832 made of a highly conductive material or the like attached to the flat block mounting surface 831a. The wave absorbing block 832 has a plurality of convex incident portions 832b that protrude toward the heat insulating unit 20 side from a substantially flat protruding reference surface 832a' that is perpendicular to the incident direction of the measurement wave, and these convex incident portions 832b are incident on the TM wave of the measurement wave at Brewster's angle θ B The TM wave of the measurement radio wave is incident at Brewster angle θ B In the radio wave absorbing block 832 having a continuous convex incident portion 832b having an isosceles triangular cross section and consisting of a first inclined surface 832b1 and a second inclined surface 832b2, the TM wave of the measurement radio wave is incident at a Brewster angle θ as a series of the first and second inclined surfaces 832b1 and 832b2 in the plurality of convex incident portions 832b. B The incident surface 83a is formed so that the incident light is incident at a constant angle. The angle formed by the first and second inclined surfaces 832b1 and 832b2 of each convex incident portion 832b in the radio wave absorbing block 832 and the protruding reference surface 832a' is "90°-θ B ", the TM wave of the measurement radio wave is incident on the first and second inclined surfaces 832b1 and 832b2 of each convex incident portion 832b at a Brewster angle θ B It can be made incident at

[0065] In the power information acquisition mechanism 1H′ of the eighth configuration example, which has been modified in this way, the TM wave of the measurement radio wave is incident on the incident surface 83a of the radio wave absorber 83 at the Brewster angle θ B Since the incident surface 83a of the radio wave absorber 83 can be made to have the same area as the incident surface 82a of the radio wave absorber 82 described above, the radio wave absorption of the radio wave absorber 83 can be improved and highly accurate power information can be acquired. Furthermore, if the area of ​​the incident surface 83a of the radio wave absorber 83 is made the same as the area of ​​the incident surface 82a of the radio wave absorber 82 described above, the amount of protrusion from the protruding reference surface 832a' can be reduced to about half, which has the advantage of allowing the radio wave absorbing block 832 to be configured compactly. The high frequency power measuring device 600' in which the power information acquisition mechanism 1H' is housed in the insulating jacket 40 and the high frequency power calculation unit 50 calculates the power of the measurement high frequency signal based on the power information from the power information acquisition mechanism 1H' can be provided with sufficiently high power measurement accuracy, as well as being lightweight, compact, and inexpensive.

[0066] The above describes embodiments of the high-frequency power measuring device and power information acquisition mechanism according to the present invention based on the accompanying drawings, but the present invention is not limited to these embodiments and may be implemented by adapting publicly known, existing equivalent technical means as long as the configuration described in the claims is not changed.

[0067] REFERENCE SIGNS LIST 100 High frequency power measuring device (first embodiment) 1A Power information acquisition mechanism (first configuration example) 10 Connection section 20 Heat insulating section 30A Conversion comparison section 31 Radio wave absorber 31a Incident surface 32 Temperature reference block 33 Thermocouple 34 Resistor 40 Heat insulating jacket 50 High frequency power calculation section 51 DC voltmeter 52 DC power supply

Claims

1. A high frequency power measuring device comprising: a power information acquisition mechanism including a connection section connected to a transmitting facility and radiating a high frequency signal for power measurement received from the transmitting facility into space as a measurement radio wave; a heat insulating section which is a space through which the measurement radio wave radiated from the connection section propagates and which can ensure a sufficient heat insulating distance; and a conversion comparison section which receives the measurement radio wave that has arrived through the heat insulating section with a radio wave absorber and converts it into heat to obtain heat change information which allows a comparison of the heat change before and after the irradiation of the measurement radio wave; and a high frequency power calculation section which calculates the power of the high frequency signal based on the heat change information from the conversion comparison section in the power information acquisition mechanism, wherein the connection section transmits the linearly polarized wave of the measurement radio wave in an orientation which makes it a TM wave, and the conversion comparison section is positioned so that the incident surface of the radio wave absorber is inclined so that the TM wave of the measurement radio wave is incident at Brewster's angle.

2. The high frequency power measuring device according to claim 1, characterized in that the conversion comparison section is provided with a reflection means for receiving a reflected wave reflected from the incident surface of the radio wave absorber and reflecting it back onto the incident surface of the radio wave absorber to promote re-absorption.

3. A high frequency power measuring device according to claim 2, wherein said reflecting means has an incident surface that receives the reflected wave from said radio wave absorber in a concave shape.

4. The high-frequency power measuring device as described in claim 1, characterized in that the insulating section is provided with an offset parabolic relay reflection means that receives the measurement radio waves radiated from the connection section and converges the reflected waves toward the radio wave absorber of the conversion comparison section.

5. A high frequency power measuring device as claimed in any one of claims 1 to 4, characterized in that it comprises a dummy connection section, a dummy insulation section and a dummy conversion comparison section having the same structure as the power information acquisition mechanism, but which does not receive the high frequency signal from the transmission equipment, and by placing the power information acquisition mechanism and the dummy power information acquisition mechanism in the same temperature environment, the temperature information of the radio wave absorber in the dummy conversion comparison section of the dummy power information acquisition mechanism is used to cancel out temperature changes occurring in the surroundings.

6. A power information acquisition mechanism comprising: a connection section connected to a transmitting equipment and radiating a high-frequency signal for power measurement received from the transmitting equipment into space as a measurement radio wave; a heat insulating section which is a space through which the measurement radio wave radiated from the connection section propagates and which can ensure a sufficient heat insulating distance; and a conversion comparison section which receives the measurement radio wave that has arrived through the heat insulating section with a radio wave absorber and converts it into heat, and acquires heat change information which allows comparison of the heat change before and after irradiation of the measurement radio wave.

7. The power information acquisition mechanism described in claim 6, characterized in that the connection section transmits the linearly polarized measurement radio waves in an orientation such that they become TM waves, and the radio wave absorber of the conversion comparison section has one or more convex entrance sections on the entrance surface on which the measurement radio waves are incident, the inclined surface being oriented so that the TM waves of the measurement radio waves are incident at Brewster's angle.

8. A high frequency power measuring device comprising: a power information acquisition mechanism as defined in claim 6 or 7; and a high frequency power calculation unit that determines the power of the high frequency signal based on the thermal change information acquired by the power information acquisition mechanism.

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