KR0146563B1 - Electromagnetic field radiator using optical interface - Google Patents

Abstract

The present invention relates to an electromagnetic wave radiator using an optical connection, comprising: an all-optical converter for inputting an electrical signal from an external signal generator and converting the electrical signal into an optical signal corresponding to the electrical signal; An optical cable transferring an optical signal generated from the all-optical converter to an antenna; An optical / electric converter which converts the optical signal transmitted through the optical cable into an electrical signal corresponding to the optical signal and outputs the electrical signal; And an antenna that receives the electrical signal from the photoelectric converter as an input and radiates electromagnetic waves, thereby realizing a radiator having no influence by a conductive cable, and effectively using the same to obtain accurate measurement results. Can be.

Description

Electromagnetic Field Radiator Using Optical Interface

1 is a block diagram of an electromagnetic wave radiator according to the present invention.

2 is an antenna used by the present invention,

(a) is a perspective view of a spherical dipole antenna,

(b) is a cross-sectional view showing a screw groove and a fluid plate for joining two hemispheres of a spherical dipole antenna.

3 is a cross-sectional view of a spherical dipole antenna.

* Explanation of symbols for main parts of the drawings

1: signal generator 2: coaxial cable

3: E / O converter 4: Optical cable

5: O / E converter 6: LED

7: Optical switch 8: Battery

9: antenna 12: dielectric

16: Connector

The present invention relates to electromagnetic radiation using an optical connection, and more particularly, to an electromagnetic radiation using an optical connection so that the electromagnetic wave radiated from the antenna is not affected by the cable for signal transmission.

Antennas that radiate electromagnetic waves are generally supplied with a cable made of a conductive material.

However, if it is necessary to repeatedly generate accurate radiation, accurate results cannot be expected using antennas with conductive cables.

Conventional electromagnetic radiation has been analyzed considering only the characteristics of the radiation, ignoring the distortion of the radiation by the cable.

However, in actual use, an electric cable that must supply a signal is required, so the electromagnetic waves radiated have different characteristics from those predicted.

This is not a problem if the sole purpose is to transmit a signal from the transmitting side to the receiving side as in the case of using such a communication purpose, but if the purpose of accurate electromagnetic wave generation is to provide a signal in a different way.

An energy transmission means that does not affect the electrical is an optical signal.

Therefore, in order to achieve the above object to transmit the signal using the optical signal.

By converting the electrical signal obtained from the signal generator into an optical signal, transmitting it to an optical cable, and then restoring the electrical signal from the antenna to an electrical signal and supplying it to the antenna, it is possible to transmit a desired signal while ignoring the influence of the conductive cable. .

When attempting to measure the shielding effect on the structure of a closed cabinet, leakage results vary greatly depending on the type of antenna as well as the type of antenna used, so reproducible results cannot be expected.

In addition, in the characteristic test of the simple electro-magnetic interference (EMI) measurement facility, the influence of the test object inside as well as the influence of the connected cable are simultaneously considered, so that the exact characteristics of the facility cannot be confirmed.

In the site attenuation measurement of the electromagnetic anechoic chamber, the induced current in the cable may introduce a measurement error.

In the case where a radiator without the influence of the cable is required, an electromagnetic radiator using an optical cable can be effectively used to obtain accurate measurement results.

Accordingly, an object of the present invention is to provide an electromagnetic wave radiator using an optical connection, which transmits an optical signal to an antenna using an optical cable and converts it into an electrical signal and radiates it in order to reduce an error caused by a conductive cable.

In order to achieve the object as described above, the present invention includes an all-optical converter that converts an electrical signal from an external signal generator and converts it into an optical signal corresponding to the electrical signal; An optical cable transferring an optical signal generated from the all-optical converter to an antenna; An optical / electric converter which converts the optical signal transmitted through the optical cable into an electrical signal corresponding to the optical signal and outputs the electrical signal; And an antenna that receives an electrical signal from the photoelectric converter as an input and radiates electromagnetic waves.

Hereinafter, with reference to the accompanying drawings will be described an embodiment of the present invention;

1 is a block diagram of an electromagnetic wave radiator according to the present invention.

In FIG. 1, 1 is an external signal generator for generating a signal to be copied, 2 is a coaxial cable for transmitting a signal input from the signal generator, and 3 is an all-optical light for converting an electrical signal obtained from the signal generator into an optical signal. Converter, 4 is an optical cable for transmitting an external optical signal to the antenna, 5 is an optical / electric converter for restoring the optical signal to an electrical signal in order to transmit an electrical signal to the antenna, and 6 is ON / OFF the circuit inside the antenna. LEDs for controlling the necessary power, 7 is an optical switch for controlling the power inside the antenna, 8 is a battery for supplying the power required to operate the circuit inside the antenna, 9 is an antenna for generating electromagnetic waves.

The electromagnetic radiation using the optical signal is composed of a part for transmitting the necessary RF signal and a part for controlling the power source.

The part supplying the RF signal includes an all-optical converter 30 for converting an electrical signal into an optical signal, an optical cable 4 for transmitting an optical signal to an antenna, and an optical / electric converter 5 for restoring an optical signal to an electrical signal. ), And an antenna 9 for radiating electromagnetic waves.

The signal required for radiation is obtained from an external signal generator 1 and supplied through the coaxial cable 2.

The coaxial cable that delivers the RF signal is installed outside the area to be tested and the optical cable 4 is installed in the space to be measured so that the signal can be transmitted to the antenna while ignoring the influence of the conductive cable.

The length of the optical cable should be set in consideration of the size of the space used.

Since the photoelectric converter 5 must be installed inside the antenna, a power source for operating the antenna is required.

Since the power can not be transmitted to the optical cable to install the battery (8) inside.

In actual measurement, it may take more time to create and prepare a proper environment than to radiate electromagnetic waves.

Therefore, the battery power is limited, so it is necessary to operate the optoelectric converter only when necessary and to turn it off at other times.

To this end, the optical switch 7 is installed between the battery and the photoelectric converter.

The optical switch 7 is connected to the external LED (6) using an optical cable.

The optical switch connects the battery power to the photoelectric converter only when light is transmitted from the outside, and cuts off the power when the light is not transmitted, thereby making the most efficient use of the limited battery life.

2 is a structural diagram of an antenna used in the present invention, (a) is a perspective view of a spherical dipole antenna, and (b) is a sectional view showing a screw groove and a fluid plate for joining two hemispheres of the spherical dipole antenna.

Antennas that can be used for electromagnetic radiation using optical connections must have an internal space since an electro-optical converter must be installed. In addition, the simpler the structure and the simpler the interpretation of the electrical characteristics, the better. As one of antennas capable of satisfying such a condition, the present invention uses a spherical dipole antenna.

3 is a cross-sectional view of a spherical dipole antenna.

2 and 3, 10 is the upper hemisphere of the hemispheres constituting the spherical antenna, 11 is the lower hemisphere among the hemispheres constituting the spherical antenna, 12 is a dielectric plate for insulating the upper and lower hemispheres, and Conductor plate necessary for joining the upper hemisphere and transferring current to the surface of the upper hemisphere, 14 is a conductor plate for joining the lower hemisphere and transferring current to the surface of the lower hemisphere, 15 is a screw groove connecting the conductor plate and the hemisphere, and A connector for transmitting an electrical signal to the antenna, 17 represents an outlet for connecting an optical cable connected to the outside, respectively.

The structure of the spherical dipole antenna is shown in FIG.

It consists of the upper half hemisphere 10 and the lower hemisphere 11, and the dielectric plate 12 which insulates them.

The antenna supplies the positive and negative signals obtained from the opto-electric converter to the upper and lower hemispheres 10 and 11, respectively, so that current flows to the outer surface of the conductor. Conductor plates 13 and 14 are adhered to both sides of the dielectric plate to transmit electrical signals to the conductor surface and to fix the two hemispheres.

Make a male screw at the corner of the conductor plate as shown in Figure 2 (b). Female screws are also made on the inside of the hemisphere for ease of assembly and separation from each other.

In order to supply the electrical signal obtained from the opto-electric converter to the antenna, the connector 16 is installed in the center portion and transmits the RF signal.

Optical cables connecting to the outside are made by drilling holes in the poles of the old dipole antenna.

When transmitting through an optical cable, the energy transmitted is not an electrical signal, but an optical signal, so that the radiation wave can be prevented from being distorted by the conductive cable, and the influence of the coupling between the cable and other parts can be ignored. There is this.

By selecting the spherical dipole as the electromagnetic radiation, not only the analysis is easy but also the space can be secured inside, so that the necessary circuit can be installed.

The disadvantage that can occur in the case of the old dipole antenna is resonance caused by the internal space.

If resonance occurs inside, it will not be possible to obtain the signal of desired size and may adversely affect the entire circuit.

In order to reduce the influence of resonance, the spherical antenna was divided into two hemispheres and the conductor plates 13 and 14 were installed on the equator to increase the frequency at which resonance can occur.

This structure has the effect of greatly reducing the possibility of resonance occurring. One of the important elements of a spherical dipole antenna is to ensure that signals of constant phase are all excited along the equator plane.

If the phases do not coincide, the radiation pattern of the spherical dipole antenna is not obtained uniformly, so that the exact radiation characteristics of the intended electromagnetic wave cannot be obtained.

Installing a connector that supplies electrical signals to the antenna in the center of the two conductor plates can excite the phase-matched signal on the equator, resulting in an antenna with a constant radiation pattern.

Optical cables that are connected to the outside are connected by making holes in the center of the bottom of the spherical dipole.

Since the current induced on the outer surface of the conductor is maximum at the equator and minimum at the anode, a hole for connecting the cable is made at the bottom to minimize the deterioration of the characteristic caused by the distortion of the current.

According to the present invention described above it is possible to implement a copy without the influence of the conductive cable, through which can be effectively used to obtain accurate measurement results.

Claims (6)

An all-optical converter that receives an electrical signal from an external signal generator and converts the electrical signal into an optical signal corresponding to the electrical signal; An optical cable transferring an optical signal generated from the all-optical converter to an antenna; An optical / electric converter for converting the optical signal transmitted through the optical cable into an electrical signal corresponding to the optical signal and outputting the electrical signal; And an antenna for receiving an electrical signal from the optical / electric converter as an input and radiating electromagnetic waves. 2. The power supply of claim 1, further comprising: a power source for supplying power to the opto-electric converter; Light source; An optical cable for transmitting the light of the light source; And between the power source and the optical / electric converter, and connected to the optical cable to connect the power to the optical / electric converter when light is transmitted through the optical cable, and the optical / electric converter if light is not transmitted through the optical cable. And a power control means comprising an optical switch functioning to extend the life of the power supply because the power supply is not connected to all the converters. The antenna of claim 1, wherein the antenna comprises: an upper hemisphere and a lower hemisphere; And a dielectric plate interposed between the upper and lower hemispheres to insulate the upper and lower hemispheres, and having the space therein, the optical / electric converter is installed and output from the optical / electric converter (+ ) An electromagnetic radiation radiator using an optical connection, using a spherical dipole antenna that radiates electromagnetic waves by supplying a signal and a negative signal to the upper and lower hemispheres, respectively, so that current flows to the outer surface. 4. The method of claim 3, wherein the electrical signal output from the photoelectric converter is transmitted to the conductor surface of the upper and lower hemispheres of the spherical dipole antenna, and adhered to both sides of the dielectric plate to fix the upper and lower hemispheres. An electromagnetic wave radiator using an optical connection, comprising adding a conductor plate. 4. The connector of claim 3, further comprising a connector installed at a central portion of the two conductor plates to supply an electrical signal output from the photoelectric converter to the antenna and obtain a constant radiation pattern through the antenna. Electromagnetic radiation using optical connection. The spherical dipole antenna of claim 3, wherein the spherical dipole antenna is installed at a pole of one of the hemispheres of the upper and lower hemispheres to prevent electromagnetic waves radiated from the antennas from being distorted by the conductive cable. Electromagnetic radiation using an optical connection, characterized in that it has a hole to make.