JPS60121838A - Measuring method of standing wave ratio - Google Patents

Abstract

PURPOSE:To reduce the investment for facilities and trouble for the measurement of the standing wave ratio of the antenna of an automatic public telephone system by using the transmission output of a body to be tested as a signal source and using a receive electric field intensity detector for level detection. CONSTITUTION:The transmission part of a transmitter and receiver 2 is used as a high frequency signal generation source, and progressive wave electric power and reflected wave electric power are switched and led out by a high frequency prepositional circuit 8 inserted for the measurement; and the electric power is measured by the receive electric field intensity detecting circuit of another transmitter and receiver 9. The measurement result is processed by a logical circuit 10 to obtain a standing wave ratio.

Description

Detailed Description of the Invention (Technical Field) The present invention relates to a receiving field strength detector included in a test device for data transmission or channel control, and a transmitting/receiving field strength detector included in a mobile telephone device in a test for making and receiving calls with a mobile telephone device. This invention relates to a method of measuring the standing wave ratio of an antenna using a signal source of the transmission output of the aircraft itself.

(Background Art) Conventional test equipment is intended for measuring the main performance of the transmitter/receiver and controller of radio telephone equipment, and is used not only for this type of mobile telephone equipment but also for general mobile objects, such as antennas. When measuring characteristics, use a pass-through wattmeter, reactance make,
A method is used in which the standing wave ratio is determined by using a dedicated measuring device such as a network analyzer, or by a combination of a directional coupler, a power meter, and a pseudo load. However, many of the companies that perform on-site antenna fault diagnosis are small businesses, and for these companies, the capital investment for dedicated measuring equipment is significant. This is done by observing physical phenomena or conducting continuity tests using direct current.These methods have the disadvantage of causing frequent diagnostic errors because they are imperfect methods. 2 is an example of a conventional method for measuring . Cable listening antenna, 4 is earth or a metal with an impedance equivalent to the earth, 5 is a test coaxial cable connecting the antenna and directional coupler 2, and the standing wave ratio and loss of this cable can be ignored. 6 is a directional coupler that connects the power of the traveling wave to the antenna and the power of the reflected wave from the antenna: 3
The wattmeter 7 is a pseudo load that is used to avoid disturbing the impedance of the measurement system. It is assumed that the standing wave ratio of all measuring instruments used in this measurement is negligibly small compared to that of the antenna.

In FIG. 1, first, the force meter 6 and the pseudo load 7 are connected as shown by solid lines. The signal generator 1 is tuned to the test frequency of the antenna, and its output passes through the directional coupler 2 and the coaxial cable 5 and is radiated from the antenna to the air as traveling wave power. On the other hand, when the antenna standing wave ratio (VSWI()>1), a part or most of the power applied from the signal generator 1 to the antenna 3 is reflected by the antenna and flows toward the signal generator. In this process, , the traveling wave power P applied from the signal generator 1 to the antenna 3 is measured on the power side 6.Next, the power meter 6 and the pseudo load 7 are connected as shown in the dotted line, and the signal generator 3 is connected to the anti-two 3. The reflected power Pr flowing in the direction is measured on the power side 6.

Using these 4111 constant values, the standing wave ratio (
VSWI) is also calculated.

Here, J□ is the traveling wave power, and ]'r is the reflected wave power, both of which are expressed in units of watts (b).

These conventional methods require a lot of equipment and maintenance, and are time-consuming and difficult to measure. There are drawbacks.

(Objective of the Invention) In order to solve these drawbacks, the object of the present invention is to use the transmission output of the transmitter/receiver as the test object as a signal signal, and to use the existing receiving field strength meter of the test equipment for this purpose as well. The purpose of the present invention is to provide a test device that can measure the standing wave ratio of an antenna as a test object, and will be described in detail below.

(Structure and operation of the invention) FIG. 2 shows an embodiment of the present invention, where ■ is a controller of a mobile telephone device, 2 is a transmitter/receiver that can be externally controlled, and 3 to 5 are the same as those in FIG. 1. figure. 8 is a high-frequency pre-circuit for testing the incoming and outgoing calls carried out between the conventional test equipment and the mobile telephone equipment, and for measuring the characteristics of the mobile telephone equipment, as shown in Figure 3. A directional coupling circuit for measurement is added, and 9 is a transceiver for simultaneous transmission and reception with the mobile telephone device 6, and the transceiver 2 is used for channel A/channel control etc. for making and receiving calls. This transceiver also includes a received field strength detection circuit. 10 is a logic circuit that performs automatic control, data transmission/reception measurement, and display of results for test of incoming and outgoing calls with the mobile telephone device, measurement of characteristics, etc.; width converter; C1) U; control, display, interface; It is composed of ETC. Reference numeral 12 denotes a control and data transmission/reception line for executing call testing, measurement of mobile phone characteristics, etc. of the mobile telephone device using the testing device.

In FIG. 3, the moon is a receiving line terminal to which the transmitter of the transceiver 2 of FIG. 2 is connected, and which receives a transmission output for measuring the reception characteristics of the mobile telephone device and the outgoing/receiving call destination with the mobile telephone device; 12 is provided to control the transmission output to an appropriate level. 1; 3 is a terminal to which the transmitter/receiver 2 shown in FIG.
Terminal for receiving transmission power for measuring swIt, 1
4 is an attenuator that appropriately adjusts the reception level supplied to the transceiver 2 or the level supplied to the transceiver 9 and antenna of the test device; 15 is a sergy generator that has directionality for the signal;
18 to 20 are the characteristics of the mobile device and the vswa of the antenna.
16 is a directional coupler (LE is a traveling wave, 1'' is a terminal for taking out a reflected wave), and 2J is an input terminal of the receiving section of the transmitter/receiver 9.

In FIG. 2, the test device sets the transceiver 2 to a test frequency from a logic circuit 10 through a control/data transmission/reception line 11, and then puts it into a transmitting state. At the same time, the transceiver 9 is set to receive at the same test frequency under the control of the logic circuit, and the contacts of the relays 18 to 20 in FIG. 3 are switched to a.

In such a state, the output of the transmitter/receiver (number 2) is applied to the high frequency pre-circuit 8.
This will be explained with a diagram. That is, its output is applied to terminal 13,
It is attenuated by the attenuator 14 to a desired level (adjusted to a level that can be detected by the received field strength detection circuit), and the circulator 15, relay 18, directional coupler 1G, output terminal 17, that is, the prefix shown in FIG. It is radiated from the antenna 3 via the circuit 8 and the coaxial cable 5. On the other hand, if the standing wave ratio (V5WR) of the antenna is >1, part or most of the power applied from the transceiver 2 to the antenna 3 is reflected by the antenna 3 and flows back toward the transceiver 2. . In this process, traveling wave power (Pka) is taken out from the terminal 1 of the directional coupler 16 in FIG. 3, and reflected power (J'r) is taken out from the terminal I. However, at t7, in this case, the relay 20 is controlled to the 1) side.

Each power is sequentially transmitted to the receiving section of the transmitter/receiver ().
The receiving end 2 in the figure is increased by [13], and its output is
It is added to the received field strength detection circuit having the characteristics as shown in the figure, and is converted into DC voltage and increased.Then, it is added to the Al1) converter included in the logic circuit
The values of a table (a table that expresses the power ratio versus VSWJl and the number of bits using the values predicted by the calculation formula described in the explanation of the conventional technology) and A/A are stored in the memory of U. 1] Check the output of the converter for comparison, read the matched value, and digitally display the resulting value on the display section included in the logic circuit 10. Cable 5 used for this measurement, attenuator shown in FIG. 3] 4, circulator 15,
The relays 18 to 20, the directional coupler 16, and the lines connected thereto are of an order that can be ignored compared to the VSWILK of the antenna 3.

(Effects of the Invention) In order to measure the standing wave ratio (VSWR) of an antenna, the present invention does not require a special measuring device, uses the transmission output of the device under test as a signal source, and uses forward waves and reflected waves as a signal source. For level detection, existing received field strength detectors can be used to achieve the purpose by simply adding some functionality, reducing equipment investment. It has the advantage of being convenient in that it can be connected to the measurement of various characteristics of other devices, and can be used particularly for fault diagnosis of this type of mobile phone equipment in the field.

[BRIEF DESCRIPTION OF THE DRAWINGS] FIG. 1 is a diagram not showing the conventional standing wave ratio measuring method, FIG. 2 is a diagram not showing the standing wave ratio measuring method according to the present invention, and FIG. 3 is a diagram not showing the standing wave ratio measuring method according to the present invention. A block diagram of the high frequency pre-circuit 8, FIG. 1 is a characteristic diagram of the received electric field strength detection circuit. Special W "Applicant Oki Electric Industry Co., Ltd. Patent Application Agent Megumi Yamamoto - Fig. 1 Fig. 2 Fig. 3 Fig. 2-ri Fig. 4 Brown frequency trough procedure amendment 1 - (Voluntary) August 1982 Manabu Shiga, Commissioner of the Japan Patent Office on the 6th 1 Display of the case 1982 Patent Application No. 229099 2 Name of the invention Standing wave ratio measurement method 3 Relationship with the supplementary IF case Patent applicant name (T129) Oki Denki Kogyo Co., Ltd. 5. Subject of amendment (1) Amend the scope of claims with specifications as shown in the attached sheet. (2) Change "at the receiving section" to "receiving section" on page 8, line 3 of the specification.
and correct it. (3) Amend Figure 2 of the drawings as shown in the attached sheet. -L Claims: A transmitter/receiver including a received field strength detection means, its controller, an antenna, and a standing wave ratio of an antenna in a mobile telephone equipment of a public automobile telephone system having the transmitter/receiver and the antenna ζ. In the measurement method, the transmitting section of the transceiver is used as a high-frequency signal generation source, and for measurement, traveling wave power and reflected wave power are switched and extracted by a high-frequency precircuit for measurement. A method for measuring a standing wave ratio, characterized in that power is measured by a received field strength detection means of another transmitter/receiver, and the measurement result is calculated by a logic circuit to provide a standing wave ratio value.

Claims (1)

[Claims] Standing wave ratio measurement power of an antenna in a public automatic telephone system having a transceiver including a received field strength detection means, a controller thereof, an antenna, and a high frequency precircuit inserted between the transceiver and the antenna. In the method, the transmitting section of the transceiver is used as a high-frequency signal generation source, and the forward-wave power and reflected wave power are switched and extracted by the high-frequency pre-circuit.
7. A standing wave ratio measuring method, characterized in that the power is measured by a received field strength detection means of another transmitter/receiver, and the measurement result is calculated by a logic circuit to provide a standing wave ratio value.