SU1318940A1 - Transducer of intensity of high-frequency electric field - Google Patents

Abstract

The purpose of the invention is to increase measurement accuracy by ensuring the isotropy of the radiation pattern (NF). The sensor contains three orthogonal antennas 1, each of which consists of dipole 2, diode 4 and capacitor 5 connected between the near ends of the vibrators dipole 2, an RC low-pass filter consisting of a resistor 6 and a capacitor 7, and communication lines 8. Dipole 2 is placed on the diel. a substrate 3, in whose slot 9 a resistor 6 is placed. When the sensor is inserted into the measured electromagnetic field, high frequency currents (HFT) are induced in all the conductive elements. CVT induced in resistors 6, for any orientvtstsin vector field is proportional to the CVT induced in acc. dipole 2, skla

Description

come with them and do not distort the DN of the sensor. RFT induced in resistive conductors located at an angle to the antennas are not proportional to the CVT induced in antennas 1 when the field vector rotates with respect to the sensor. Therefore, they pass on di

The invention relates to a technique for measuring parameters of an electromagnetic field (EMI) and can be used in measuring the intensity of a high-frequency electric field near high-power RF and microwave devices for assessing the degree of biological hazard of RF and microwave radiation.

The aim of the invention is to improve the accuracy of measurements by ensuring the isotropy of the radiation pattern.

Figure 1 shows the construction of a high-frequency electric field voltage sensor; Fig. 2 shows a structural electrical circuit of a device for measuring the intensity of a high-frequency electric field using a sensor.

The sensor for measuring the voltage of the high-frequency electric field contains three orthogonal antennas I, each of which is made in the form of a dipole 2 placed on a dielectric substrate 3, diode A, capacitor 5, RC low-pass filter consisting of a resistor 6 and a capacitor 7 , lines 8 communication; the resistor 6 is placed in the slot 9, made in the dielectric substrate 3,

A device for measuring the voltage of an electric field contains a sensor for measuring the voltage of an electric field, connected via non-resistive conductors 10 placed on a dielectric rod 11, with an indicator 12, the sensor and resistive conductors 10 are placed in a dielectric case I3 to protect them from external mechanical impacts and corrosive environments.

one a weakened RC filter. The purpose of the invention is achieved by placing the resistor 6 of the RC low pass filter in parallel with the dipole 2 vibrators and connecting the input terminals of the RC filter to the remote ends of the dipole dipoles 2. 2 Il.

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Sensor voltage electric high frequency field operates as follows.

When inserting a strain gauge

the electric field in the measured EMF. RF currents are induced not only on antennas 1, but also in all other extended conductive elements, for example, in resistor 6, line 8, resistive conductors 10, if the orientation of the field vector is projected onto data conductors. Since the resistors 6 are in the same plane with the antenna 1 and are directed along their axes, their radiation pattern coincides with the radiation pattern of the antenna 1. This means that the high-frequency currents induced by the electric field in the resistors 6 are proportional to the high-frequency currents induced in the corresponding dipole For any orientation of the vector field, and folding with them, do not distort the radiation pattern of the sensor as a whole.

The high frequency currents induced in the resistors 6 and the resistive conductors 10 located at a certain angle to the antennas 1 do not change in proportion to the induced currents in the antennas I when the field vector rotates with respect to the sensor. But since the path of the HF currents induced in the lines 8 of the communication and resistive conductors 10 is blocked by an RC filter formed by resistors 6 and capacitors 7, they arrive at diode 4 attenuated by an amount corresponding to

0 transmission of the RC filter. The required amount of attenuation of the KC filter is determined by the choice of the resistance value of the resistor 4 and the capacitance of the capacitor 7.

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The non-uniformity of the isotropy of the radiation pattern of the sensor depends only on the identity of the geometric dimensions of the antennas 1 and the accuracy of the selection of diodes 4 in terms of the conversion of RF currents into direct current and the accuracy of selection of the capacitance of the capacitor 7,

Claims (1)

Invention Formula The voltage sensor of a high-frequency electric field, containing three orthogonal antennas, each of which is designed as a dipole, times 04 a diode and a capacitor placed on the dielectric substrate connected between the nearest ends of dipole vibrators, a low-pass filter connected to a communication line, characterized in that, in order to improve measurement accuracy by ensuring the isotropy of the radiation pattern, the low-pass RC resistor is placed in parallel vibrators dipole, and the input terminals of the RC-filter are connected to the remote ends of the vibrators dipole. Editor L.Gratillo Compiled by V. Ezhov Tehred M. Khodanich Proofreader I. Muska Order 2506/39 Circulation 730 Subscription VNIIPI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5 Production and printing company, Uzhgorod, st. Project, 4 FIG. 2