KR20120069176A - Apparatus for measuring radiated power and erp - Google Patents

Abstract

PURPOSE: A radiated power and effective radiated power measuring device is provided to reduce the time for far field measurement by removing the need for moving a probe. CONSTITUTION: A radiated power and effective radiated power measuring device comprises a measurement antenna(10), an RF cable(11), a multi-probe antenna(21), and a signal cable(22). RF signals output from a signal generator are transmitted to the measurement antenna through the RF cable. The multi-probe antenna is arranged at an interval from the measurement antenna. The signal cable is connected to the multi-probe antenna to deliver the signals received through the multi-probe antenna to a signal analyzer.

Description

Radiation power and effective radiation power measuring device {APPARATUS FOR MEASURING RADIATED POWER AND ERP}

The present invention relates to an apparatus for measuring radiation power and effective radiation power.

In general, methods for measuring the radiation characteristics of an antenna include far field measurement, near field measurement, Fresnel zone measurement, and the like.

Far field measurement has the advantage of obtaining a desired value in one scan, but there is a disadvantage that the size of the chamber must be large because the distance between the source antenna and the test antenna must be separated by the far field condition. Near field measurements and Fresnel zone measurements can be applied in smaller chambers because they perform measurements closer than far field measurements, but measurement times are longer than far field measurements because data must be acquired at multiple points. In particular, the near field measurement method requires a power value at intervals smaller than half wavelengths, and therefore, it takes a long time to perform all data acquisition. Fresnel zone measurements have the advantage of shorter measurement times and simpler instruments because they have fewer data acquisition points than near field measurements.

The conventional Fresnel zone measurement method is described as follows.

1 is a diagram illustrating a conventional Fresnel zone measuring apparatus using a single probe.

Referring to FIG. 1, an RF signal from a signal generator is connected to a measurement antenna 10 such as a base station antenna through an RF cable 11. A general probe antenna 12 is disposed at a distance D, and an RF cable 13 is connected to the signal analyzer. The height adjuster 15 and the distance adjuster 16 are used to move the probe to the point 14 to obtain the electric field value.

On the other hand, when these three methods are applied to the measurement of effective radiated power (ERP) for wireless devices such as base stations and repeaters installed in the field, various problems occur.

First, the far field measurement method needs to be spaced apart from the base station / repeater / terminal by a distance that satisfies the far field condition. Therefore, it is difficult to obtain an accurate value due to electromagnetic waves entering the multipath. On the other hand, near field measurement and Fresnel zone measurement perform data acquisition at a distance closer than far field conditions, so the multipath effect can be suppressed. However, because the near field measurement method takes a long time to measure, it is subject to external changes such as wind, and it is difficult to use because the structure is complicated.

Fresnel zone measurement, on the other hand, is the optimal method because of the shorter measurement time and simpler instrument than near field measurement. However, the Fresnel zone measurement method is subject to external environment because the data acquisition time is longer than the far field measurement time. This is because data acquisition is performed by moving one probe to the measurement point.

Accordingly, an object of the present invention is to provide an apparatus for measuring radiation power and effective radiation power, which reduces measurement time by using multiple probes for a relatively long measurement time of a conventional Fresnel zone measurement technique using a single probe.

In order to achieve the above object of the present invention, the present invention is provided with a measuring antenna that receives and radiates RF signals for measuring radiated power and effective radiated power, and is installed at a position separated by a predetermined distance from the measuring antenna, and supports and frames are provided. A signal for extracting values for calculating radiated power and effective radiated power from a multi-probe antenna composed of a plurality of probes installed on the support to correspond to the measurement points of the Znell zone, and a signal received through the multi-probe antenna. It includes a signal cable to the analyzer.

In the conventional measuring method using a single probe, the measurement time is long because the probe must be moved to a desired point. On the other hand, as in the present invention, since the measuring device using multiple probes does not need to move the probe, the far field value can be obtained within a short time. The speed required for the measurement is very similar to that of the general far field measurement.

1 is a diagram illustrating a conventional Fresnel zone measuring apparatus using a single probe.
2 is a diagram illustrating a radiation power and effective radiation power measuring apparatus according to a preferred embodiment of the present invention.
3 illustrates various configuration embodiments of a multi-probe antenna.
4 is a diagram illustrating exemplary embodiments of deploying multiple probes.

As the invention allows for various changes and numerous embodiments, particular embodiments will be illustrated in the drawings and described in detail in the written description. It should be understood, however, that the invention is not intended to be limited to the particular embodiments, but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention. Like reference numerals are used for like elements in describing each drawing.

The terms first, second, A, B, etc. may be used to describe various elements, but the elements should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, the first component may be referred to as a second component, and similarly, the second component may also be referred to as a first component. And / or < / RTI > includes any combination of a plurality of related listed items or any of a plurality of related listed items.

When a component is referred to as being "connected" or "connected" to another component, it may be directly connected to or connected to that other component, but it may be understood that other components may be present in between. Should be. On the other hand, when an element is referred to as being "directly connected" or "directly connected" to another element, it should be understood that there are no other elements in between.

The terminology used herein is for the purpose of describing particular example embodiments only and is not intended to be limiting of the present invention. Singular expressions include plural expressions unless the context clearly indicates otherwise. In this application, the terms "comprise" or "have" are intended to indicate that there is a feature, number, step, operation, component, part, or combination thereof described in the specification, and one or more other features. It is to be understood that the present invention does not exclude the possibility of the presence or the addition of numbers, steps, operations, components, components, or a combination thereof.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art. Terms such as those defined in the commonly used dictionaries should be construed as having meanings consistent with the meanings in the context of the related art and shall not be construed in ideal or excessively formal meanings unless expressly defined in this application. Do not.

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

2 is a diagram illustrating a radiation power and effective radiation power measuring apparatus according to a preferred embodiment of the present invention.

The radiation power and effective radiation power measuring apparatus of FIG. 2 measures radiation power and effective radiation power by using multiple probes in a Fresnel zone.

The radiated power and effective radiated power measuring apparatus includes a measuring antenna 10, an RF cable 11, a multiple probe antenna 21, and a signal cable 22.

The RF signal from the signal generator is connected to the measuring antenna 10 such as the base station antenna via the RF cable 11. The RF signal is a signal generated by a signal generator for measuring radiated power and effective radiated power. The measuring antenna 10 receives and radiates an RF signal for measuring radiated power and effective radiated power.

The multiple probe antenna 21 is disposed at a distance D from the measurement antenna 10, and the signal cable 22 is connected to the multiple probe antenna 21. The signal cable 22 connected to the multiple probe antenna 210 sends a signal received through the multiple probe antenna 21 to a signal analyzer (not shown). The signal analyzer extracts values for the calculation of the radiated power and the effective radiated power. The values for the calculation of the radiated power and the effective radiated power are calculated according to a measurement formula according to the Fresnel zone measurement method, thereby obtaining the radiated power or the effective radiated power.

 The apparatus for measuring radiation power and effective radiation power according to the present invention does not use the height adjuster 15 and the distance adjuster 16 for moving the probe to the measurement point 14 of the Fresnel zone to obtain the electric field value. In order to obtain the electric field value, the radiation power and effective radiation power measuring device configures the multiple probe antenna 21 so that the probe is located at the measurement point 14 of the Fresnel zone.

The multiple probe antenna 21 includes a plurality of probes. A plurality of probes are mounted on the support 32. Specifically, a plurality of probes are mounted on the support 32 to correspond to the measurement points 14 of the Fresnel zone.

3 illustrates various configuration embodiments of a multi-probe antenna. As shown in FIG. 3, a plurality of probes 31 are disposed on the support 32. The number of probes may vary depending on the number and frequency of measurement antennas.

First, in FIG. 3A, RF cables 33 are connected to the plurality of probes 31, respectively. The RF signal received through each probe 31 is delivered to the signal analyzer via each RF cable 33. The radiated power or effective radiated power is obtained through computer processing according to an example of Fresnel zone measurement equations such as Equation 1 and Equation 2, which are extracted through the signal analyzer.

In FIG. 3B, RF cables 42 are connected to the plurality of probes 31, and a converter 41 for converting an RF signal into an IF signal is connected to each probe 31. The conversion unit 41 converts the RF signal provided from the probe 31 into an IF signal and sends it to the signal analyzer through the IF cable 42. 3 (b) has the disadvantage that the converter 41 is needed compared to FIG. 3 (a), while the thickness and loss of the cable connected to the signal analyzer is not sensitive.

In FIG. 3C, an optical cable 52 is connected to each of the plurality of probes 31, and an RF-optic converter 51 for converting an RF signal into an optical signal is connected to each probe 31. . The RF signal obtained from each probe 31 is converted into an optical signal through the RF-optic converter 51 and sent to the signal analyzer through the optical cable 52. The optical cable 51 has the advantage that the interference with the probe is smaller than the IF cable, while the overall configuration is complicated.

3 (d) is the same as the configuration shown in FIG. 3 (a) in that the RF cables 62 are connected to the plurality of probes 31, respectively, but the RF signal collection and analysis device in the support 32 is shown. It differs in that 61 is provided. Accordingly, the signal obtained from each probe 31 is transmitted to the RF signal collection and analysis device 61 through the RF cable 62. The RF signal acquisition and analysis device 61 may be controlled through the control and data signal cable 63. Unlike conventional methods, the RF signal collection and analysis device 61 is located in close proximity to multiple probes, thereby reducing the effect of loss.

4 is a diagram illustrating exemplary embodiments of deploying multiple probes.

Referring to FIG. 4 (a), in the case of multiple probes in which the probes are linearly arranged, the measurable antenna is a linear array antenna such as a low gain base station antenna. In order to measure a high gain base station antenna or a 2D array antenna, a structure capable of moving multiple probes to the side is needed.

Referring to FIG. 4B, in the case of a multi-probe in which a probe is disposed in a two-dimensional form, not only a low-gain base station antenna but also a two-dimensional array antenna can be measured. However, as the number of probes increases, the structure is complicated and the unit cost increases.

In the arrangement example of FIG. 4, the spacing between the antennas may be wider than that of the conventional near field measurement method. Existing near field measurement method can obtain accurate value only when the data is acquired by arranging at intervals less than half wavelength. However, even if the arrangement interval of the multiple probes proposed in the present invention is arranged at half wavelength or more, accurate values can be obtained sufficiently through Equations 1 and 2.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the present invention as defined by the following claims It can be understood that

10: measuring antenna
11: RF cable
21: multiple probe antenna
22: signal cable

Claims (1)

In the radiation power and effective radiation power measuring device,
A measuring antenna that receives and radiates an RF signal for measuring radiated power and effective radiated power;
A multi-probe antenna installed at a position separated by a predetermined distance from the measuring antenna, the multi-probe antenna comprising a plurality of probes installed on the support to correspond to the measuring points of the support and Fresnel zone;
Radiation power and effective radiation power measurement apparatus comprising a signal cable for transmitting the signal received through the multi-probe antenna to the signal analyzer for extracting values for the calculation of the radiation power and the effective radiation power.

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