KR-102961345-B1 - SIGNAL ATTENUATION APPARATUS FOR ATTENUATING ELECTROMAGNETIC SIGNALS TRANSMITTED FROM AN ELECTROMAGNETIC WAVE TEST EVALUATION DEVICE TO MEASURING INSTRUMENT

Abstract

An electromagnetic wave test and evaluation device is disclosed, comprising a signal attenuation device for attenuating an electromagnetic wave signal transmitted to a measuring instrument in an electromagnetic wave test and evaluation device. The electromagnetic wave test and evaluation device may include: a signal generator for generating an RF signal (radio frequency signal); a power amplifier for amplifying the RF signal; a coupling transformer for transmitting the RF signal to a test target; an impedance stabilization network for maintaining a constant impedance characteristic transmitted to the test target; a measuring instrument connected to a circuit connecting the coupling transformer and the impedance stabilization network to the test target for measuring the operation of the test target; and a signal attenuation device for attenuating an electromagnetic wave signal transmitted from the circuit to the measuring instrument.

Inventors

• 박재홍

Assignees

• 재단법인 구미전자정보기술원

Dates

Publication Date

20260508

Application Date

20221223

Claims (3)

1. A signal generator that generates an RF signal (radio frequency signal); A power amplifier that amplifies the above RF signal; A coupling transformer that transmits the above RF signal to a test target; An impedance stabilization network that maintains a constant impedance characteristic transmitted to the above test target; A measuring instrument connected to a circuit connecting the coupling transformer and the impedance stabilization network and the test target to measure the operation of the test target; and A signal attenuation device disposed between the test subject and the measuring instrument, which is not directly connected to the measuring instrument, and utilizes an RF transformer, resistor, and capacitor circuit composed of a coil having multiple turns in each of the input and output sections to attenuate an electromagnetic signal transmitted from the circuit to the measuring instrument to a level below the maximum input power of the measuring instrument. Electromagnetic wave test and evaluation device including
2. In paragraph 1, The above signal attenuation device is, An RF transformer that blocks the DC (Direct Current) component included in the above electromagnetic signal and transmits the AC (Alternating Current) component to the above measuring instrument; Resistor and capacitor circuits Includes, The above AC component is, Electromagnetic wave test evaluation device in which the intensity is reduced by the RF transformer, the resistor, and the capacitor circuit.
3. A signal attenuation device disposed between a test subject to which electromagnetic wave testing is applied and a measuring instrument in an electromagnetic wave testing and evaluation device, wherein the device utilizes an RF transformer, a resistor, and a capacitor circuit composed of a coil having multiple turns in each of an input and an output section, which is not directly connected to the measuring instrument, to attenuate an electromagnetic wave signal transmitted to the measuring instrument to a level below the maximum input power of the measuring instrument. An RF transformer that blocks the DC component included in the electromagnetic signal and transmits the AC component to a measuring instrument; Resistor and capacitor circuits Includes, The above AC component is, A signal attenuation device in which the strength is reduced by the above RF transformer, the above resistor, and the capacitor circuit.

Description

Signal attenuation apparatus for attenuating electromagnetic signals transmitted from an electromagnetic wave test evaluation device to a measuring instrument The present invention relates to a signal attenuation device for attenuating an electromagnetic signal transmitted to a measuring instrument in an electromagnetic test and evaluation device, and an electromagnetic test and evaluation device including the signal attenuation device. In order for an electronic device to be released, electromagnetic compatibility (EMC) testing regarding the amount of electromagnetic waves emitted from the device, and EMC testing regarding the device's immunity to electromagnetic waves emitted from other electronic devices must be performed. CS101 is a test to check whether it operates normally by applying low-frequency RF signals to the power line through a transformer during electromagnetic compatibility testing. Conventional electromagnetic compatibility (EMC) testing and evaluation devices for the CS101 use a receiver meter to determine whether the electronic device is operating normally; however, due to the limitation of the receiver meter's maximum input power, they are unable to perform tests on power supplies exceeding the receiver meter's maximum input power. Therefore, a method is required to perform tests on power supplies exceeding the maximum input power of the receiver instrument. FIG. 1 is a drawing illustrating an electromagnetic wave test evaluation device according to an embodiment of the present invention. FIG. 2 is a drawing illustrating a signal attenuation device according to an embodiment of the present invention. FIG. 3 is an example of an electromagnetic wave test evaluation device including a signal attenuation device according to an embodiment of the present invention. FIG. 4 is an example of attenuation characteristics by a signal attenuation device according to an embodiment of the present invention. Hereinafter, embodiments are described in detail with reference to the attached drawings. However, various modifications may be made to the embodiments, and thus the scope of the patent application is not limited or restricted by these embodiments. It should be understood that all modifications, equivalents, and substitutions to the embodiments are included within the scope of the rights. The terms used in the embodiments are for illustrative purposes only and should not be interpreted as intended to be limiting. Singular expressions include plural expressions unless the context clearly indicates otherwise. In this specification, terms such as "comprising" or "having" are intended to indicate the existence of the features, numbers, steps, actions, components, parts, or combinations thereof described in the specification, and should be understood as not precluding the existence or addition of one or more other features, numbers, steps, actions, components, parts, or combinations thereof. In addition, when describing with reference to the attached drawings, identical components are assigned the same reference numeral regardless of drawing symbols, and redundant descriptions thereof are omitted. In describing the embodiments, if it is determined that a detailed description of related prior art could unnecessarily obscure the essence of the embodiments, such detailed description is omitted. Hereinafter, embodiments of the present invention will be described in detail with reference to the attached drawings. FIG. 1 is a drawing illustrating an electromagnetic wave test evaluation device according to an embodiment of the present invention. The electromagnetic wave test evaluation may be an Electromagnetic Compatibility (EMC) evaluation that measures interference between devices among electromagnetic waves. Furthermore, the electromagnetic wave test evaluation device according to one embodiment of the present invention may include a signal generator (120), a power amplifier (130), a coupling transformer (140), an impedance stabilization network (150), a signal attenuation device (100), and a measuring instrument (160), as shown in FIG. 1. The test subject (110) may be an electronic device to which the electromagnetic wave test evaluation is applied. For example, the test subject (110) may be defined as an Equipment Under Test (EUT). A signal generator (120) can generate an RF signal (radio frequency signal) and transmit it to a power amplifier (130). The power amplifier (130) can amplify the RF signal generated by the signal generator (120) and transmit it to the coupling transformer (140). The coupling transformer (140) can transmit the RF signal amplified by the power amplifier (130) to the test target (110). At this time, the coupling transformer (140) can transmit the RF signal in an inductive manner without contact by using coils with multiple turns, thereby preventing problems such as the transmission of DC power to the test target (110) and the occurrence of sparks. The impedance stabilization netw