JPS60135773A - Antenna measuring device - Google Patents

Abstract

PURPOSE:To shorten considerably measurement time by connecting plural horn antennas to receivers respectively, and measuring neighboring field distributions in parallel. CONSTITUTION:For example, six horn antennas 3 are provided on the front surface of opening of a plane array antenna 1, and receivers 5 are connected to the antennas 3 through feeders 4 respectively. Measured data of each receiver 5 is inputted to a common computer 6. Then each antenna 3 moves horizontally and vertically within a plane about one sixth the opening area of the antenna 1 to be used for the measurement of a neighboring field distribution. Therefore, data on a neighboring field received by each antenna 3 and measured by each receiver 5 is inputted to the computer 6 simultaneously in terms of time. This parallel input time is much shorter than the mechanical movement time of the antennas 3. Therefore, the measurement time is shortened to about one sixth.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to an antenna measuring device used to measure the near-field distribution of an antenna.

When trying to measure the far-field distribution (radiation pattern) of a reflector antenna with a large aperture or a large array antenna with several thousand element antennas outdoors.

Requires a sufficiently large outdoor measuring field. In addition, the effects of weather, reflections from surrounding buildings, and radio law regulations may become a problem.

To avoid these outdoor measurement problems.

In recent years, the antenna near-field measurement method, which involves bringing an antenna into a so-called anechoic chamber and measuring its near-field distribution with a globe antenna, calculates and processes the measurement results to determine the far field, has been actively researched. It is being put into practical use.

The present invention relates to improvements in antenna measurement devices used for this near-field measurement.

[Prior art]

A near-field measurement method using a conventional antenna measurement device will be explained with reference to FIG. In Figure 1, + (1) #″1: Planar array antenna as the test antenna whose near-field distribution is measured, (2) is the transmission source, and (3) is the probe antenna. ), (4) is the feed line, (5) is the receiver, (
6) is the bottom line. Therefore, the near-field distribution of the planar array antenna (1) is similar to that of the horn antenna (3) above and below.

It is detected while moving left and right, enters the receiver (5) through the feeder line (4), and the measured data is input into the computer (6). Therefore, when the aperture area of the planar array antenna (1) is large, the moving distance of the horn antenna (3) becomes long, and the time required for its movement increases.

As the number of observation points increases, the time required for measurement by the receiver (5) and acquisition of this measurement data by the computer (6) increases.

For example, in the 1QGHz band, it takes 6 to 8 hours to scan the entire surface of an lm x 1m aperture with a probe antenna and capture data, and if the aperture is large, measurement time is required in units of one day. . this is.

□Process measurement data in real time using a computer,
This poses a major problem when confirming operations and evaluating far-field patterns.

[Summary of the Invention] In order to solve such conventional problems, the present invention prepares a plurality of horn antennas, connects a receiver to each, and pressures them to perform date and time measurement in parallel.
This will be explained using drawings.

7 [Embodiment of the Invention] FIG. 2 is a schematic configuration diagram of an embodiment of the antenna measuring device according to the present invention, in which six horn antennas (3) are provided in front of the opening of the planar array antenna (1). and each horn antenna (3) has 1. The receiver (
5) is connected, and the measurement data of each receiver (5) is.

It is designed to be input into a common computer (6).

Each horn antenna (3) is used to measure the near-field distribution by moving vertically and horizontally within a plane that is 1/6 of the aperture A★ of the planar array antenna (1).

Therefore, near-field data received by each horn antenna (3) and measured by each receiver (5) is input into the computer (6) in parallel over a period of 9 hours. However, the parallel input time is less than the mechanical movement speed of the horn antenna (6).
It can be considered that tl is processed almost instantaneously, which is nine orders of magnitude faster than tl. Therefore, in the present invention shown in FIG. 2, the measurement time is 17
It will be shortened to 4.

Incidentally, although the case in which the number of horn antennas is 6 has been described in 9 and above, the number can be changed as necessary. In addition, although the example describes the case where the horn antenna is used for reception, the present invention is not limited to this. Measurements can also be made by connecting a transmitter instead of a receiver, using the horn antenna for transmission, and connecting the receiver to a planar antenna. You can. Further, the probe antenna is not limited to a horn antenna, and any antenna such as a dipole antenna or a helical antenna may be used. Furthermore, in the example, the horn antenna was moved and the planar array antenna was fixed.
The present invention is not limited to this, and either one or both of the horn antenna and the planar array antenna may be moved. Also, although the horn antenna moved within a plane, it is not limited to this.

A cylindrical surface, a spherical surface, etc. may be moved.

〔Effect of the invention〕

As described above, the present invention uses a plurality of horn antennas, connects a receiver to each, and processes the near-field distribution measurements in parallel, thereby significantly shortening the measurement time. It is extremely effective when used for near-field measurements of large antennas for radar and communications.

4. Brief explanation of the drawings - Fig. 1 is an explanatory diagram of the measurement of near-field distribution using a conventional globe antenna, and Fig. 2 is a schematic configuration diagram of an embodiment of the present invention. , In the figure, (1) is a planar array antenna, (3) is a bone antenna, (4) is a feed line, (5) is a receiver, and (6) is a computer.

In FIG. 1, the same or corresponding parts are designated by the same reference numerals.

Agent Masuo Oiwa

Claims (1)

[Claims] An antenna measurement device that measures the near-field distribution of the antenna under test by installing opposing antennas near the antenna under test and changing the relative positions of the antenna under test and the opposing antenna. 1. An antenna measurement device characterized by using antennas and connecting a receiver to each antenna or connecting a transmitter to each antenna so that each antenna can be operated simultaneously.