KR19990040324A - Method of Measuring Power Pattern and Radiant Radiation Power Using a Rotating Cylindrical T-cell - Google Patents

Abstract

[0001] The present invention relates to a power pattern and a total radiated power measurement method using a rotating cylindrical T-cell, and more particularly, to a radar and a method of measuring total radiated power and total radiated power using a conventional rotary type T- To a method of measuring a power pattern. Generally, a method of measuring a power pattern includes a method of measuring using a general antenna such as a dipole antenna in an electromagnetic anechoic chamber, a method using a triple loop antenna and a method using a Crawford type cell in the same place, There is a problem that it must be tested in an enclosed space with an external electromagnetic wave environment like an electromagnetic anechoic chamber. Also, there is a technical problem that the method using the existing Crawford type cell must measure the sum / difference and the phase difference of power with respect to the azimuthal change of six independent test objects. The twist of various signal lines due to the change of azimuth of the test subject and the position change are generated and the measurement is made inaccurate and the reproducibility of the measurement is low and a lot of measuring time is required. SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a method of accurately measuring power penalty and total radiated power without changing the orientation of the test object, regardless of the external electromagnetic environment, using a rotatable cylindrical T- do.

Description

A Method of Measuring Power Pattern and Total Radiant Power Using a Rotating Cylindrical T-cell

[0001] The present invention relates to a power pattern and a total radiated power measurement method using a rotating cylindrical T-cell, and more particularly, to a radar and a method of measuring total radiated power and total radiated power using a conventional rotary type T- To a method of measuring a power pattern.

Generally, a method of measuring a power pattern includes a method using a triple loop antenna and a method using a Crawford type cell in the same place as a method of measuring using a general antenna like a dipole antenna in an electromagnetic anechoic chamber, It is impossible to avoid the problem of testing in an enclosed space with an external electromagnetic wave environment like an electromagnetic wave anechoic chamber.

However, since the installation cost of the electromagnetic anechoic chamber is high and a large installation space is required, the above two methods are uneconomical. In addition, in the conventional method using the Coulomb T-cell, the total radiation power and the power pattern are measured by measuring the sum / difference and relative phase difference of the power transmitted to both ends. This method is very effective in reducing the measurement time and measuring at low price by breaking away from the method used in the conventional electromagnetic wave anechoic chamber. However, There is a technical problem that the measurement of the difference and the phase difference is indispensable. The azimuthal changes of six independent specimens are so large that they can not be supported by a regular rotating table.

In order to solve this problem, a pedestal for a subject to change the azimuth of the subject has been fabricated. However, twist and positional changes of various signal lines due to the azimuth change inevitably occur, resulting in inaccurate measurement, low measurement reproducibility, The technical problem requiring time can not be avoided. Although it is not a power pattern measurement, there is a measurement method using a GTEM cell for measuring electromagnetic interference generated from an electric or electronic device. However, all of them can not avoid a technical problem that requires more azimuth change of a subject than a TIM cell.

Therefore, according to the present invention, since the power padding and the total radiated power are measured without changing the azimuth of the test subject irrespective of the external electromagnetic environment by using the rotating cylindrical T-cell, the above problems are solved and the measurement accuracy and time The present invention provides a method of measuring a power pattern and a total radiated power using a rotating cylindrical T-cell.

According to an aspect of the present invention, there is provided a method of measuring a power pattern and a total radiated power using a rotating cylindrical T-cell, the method including: rotating a body and a driving shaft of the rotating cylindrical T- And the power of the one end is measured.

1A and 1B are a front sectional view and a side view of a cylindrical T-cell according to the present invention;

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a power measurement system using a cylindrical T-cell.

Description of the Related Art

1: Body 2: Base

3: table 4: drive shaft

5: internal conductor 21: switch 1

22: switch 2 23: hybrid combiner

24: Switch 3 25: Terminator

26: spectrum analyzer 27: computer

28: Printer / Plotter 20: Rotary cylindrical T-cell

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

1A and 1B are a front sectional view and a side view of a cylindrical T-cell according to the present invention in which a table 3 fixed to a pedestal 2 and a body 1 are separated and rotated, 5 has a structure in which the rotation angle of the drive shaft 4 connected thereto can be arbitrarily adjusted.

Referring to FIG. 2, a power pattern measuring system using a rotating cylindrical T-cell according to the present invention measures and measures only the sum / difference and one-end power of both ends without measuring the phase difference. The sum of the power at both ends is measurable through the spectrum analyzer 26 by connecting the switch 1 (21), the switch 2 (22), and the switch 3 (24) to the zero-degree hybrid coupler (23). The difference in the power of both ends can be measured through the spectrum analyzer 26 by replacing the 180 degree hybrid instead of the 0 degree hybrid in the sum of power measurements. The one-end power is directly connected to the spectrum analyzer 26 by using the switch 1 21 and the switch 3 24 so that the switch 2 22 is connected to the terminator 25 and the hybrid coupler 23 is not passed, do.

The method of measuring the total radiant power and the power pattern without changing the azimuth of the subject according to the present invention will be described in detail. A subject to be measured is installed on a table mounted in a rotary cylindrical T-cell 20, Without changing the azimuth, only the φ and ζ are changed to obtain six dipole moment terms including the phase of the test object. However, in the present invention, in order to minimize the error of the power pattern of the final test subject caused by the sum / difference of the power measured at both ends and the measurement error of the one-end power, And to provide a method of measuring the change. Because the power pattern is combined with the cosine function and the sine function of φ and ζ, the sum / difference of the power measured at both ends and the error of the one-end power do not dominantly affect the 45 degree change.

The procedure for measuring the total radiated power and power pattern without changing the azimuth of the EUT is described with reference to Table 1 below.

step rotation Power measurement ζ φ Sum of power Power car Power of one side One 0 ° 0 ° P ₁ P ₇ P ₁₃ 2 0 ° 90 ° - P ₈ P ₁₄ 3 -45 ° 0 ° P ₂ P ₉ P ₁₅ 4 -45 ° 45 ° P ₃ P ₁₀ P ₁₆ 5 -45 ° 90 ° P ₄ P ₁₁ P ₁₇ 6 -90 ° 0 ° P ₅ - P ₁₈ 7 -90 ° 90 ° P ₆ P ₁₂ P ₁₉

First, as shown in Table 1, first, a sum of power P1 at both ends, a difference P7 at both ends and a power P13 at one end are measured without changing? And?, That is, at? = 0 and?

Second, rotate at φ = 0 ° and ζ = 90 °, and measure the difference P _{8 at} both ends and the power P ₁₄ at one end.

Third, the sum P ₂ of the both ends power, the difference P ₉ of the both end powers, and the power P _{15 of the one end} are measured by rotating at φ = -45 ° and ζ = 0 °.

Fourth, φ = -45 ° and ζ = 45 ° are rotated, and the sum P ₃ of both ends of power, the difference P ₁₀ of both ends of power and the power P _{16 of one end} are measured.

Fifth, φ = -45 ° and ζ = 90 ° are rotated, and the sum P ₄ of both ends of power, the difference P ₁₁ of both ends of power and the power P _{17 of one end} are measured.

Sixth, it is rotated at φ = -90 ° and ζ = 0 °, and the sum P ₅ of both ends power and the power P _{18 of one end} are measured.

Seventh, rotate φ = -45 ° and ζ = 90 °, measure the sum P ₆ of the both end power, the difference P ₁₂ of the both end power and the power P ₁₉ of the one end. The measured powers P1 to P19 are transmitted to the computer via the GPIB cable.

In order to measure the total radiation power of the subject when the above-described measurement is completed, the measured powers P1 to P19 can be simply substituted into the following Expression 1. < EMI ID = 1.0 >

In Equation 1, π is 3.141592653, λ is the length of the wavelength, E ₀ is the termination of one end in the cylindrical T-cell 20, and the other end is a sinusoidal wave with a wavelength of λ. Represents the electric field value in the region where the test object is located. The power pattern at this time is expressed by the following equation (2).

It is possible to measure the total radiation amount and the power pattern with respect to the general test object as described above without changing the azimuth of the test subject.

As described above, the power pattern measurement according to the present invention is very simple, and there is no change in the azimuth of the test subject during the measurement process. Thus, a very accurate power pattern and total radiated power can be measured, and the measurement time is greatly shortened. There is no kink of various input signal line power lines, and the accuracy of measurement is improved.

Claims (3)

A method of measuring a power pattern and a total radiated power using a rotating cylindrical T-cell, the method comprising: rotating a body and a driving shaft of a rotating cylindrical T-cell after installing a test object; measuring a sum of power at both ends, Wherein the power is measured by using a rotation type cylindrical T-cell. The method according to claim 1, The rotating body of the rotating cylindrical T-cell and the rotating method of the driving shaft Wherein the body and the drive shaft are rotatable at 0 ° and 0 °, 0 ° and 90 °, -45 ° and 0 °, -45 ° and 45 °, -45 ° and 90 °, -90 ° and 0 °, , And the sum of the power at the both ends, the power difference at the both ends, and the power of the one end are measured. The total radiation power measurement method using the rotation type cylindrical T-cell. The method according to claim 1, The difference between the sum of the powers and the power when the body of the rotating cylindrical T-cell and the drive shaft are fixed at 0 ° and 0 °, 0 < / RTI > and < RTI ID = 0.0 > 90, < The sum of the electric power when rotated at -90 DEG and 0 DEG, Wherein the total radiated power is measured by measuring the difference between the sum of the powers and the power when rotated at -90 ° and 90 °.