KR20010035336A - Antenna and microwave detecting device - Google Patents

Abstract

PURPOSE: An antenna and microwave sensing device is provided to reduce the size of the device adopting the antenna by simplifying the structure of the antenna, while achieving wide band characteristics with reduced loss by eliminating use of dielectric member at the receiving end of antenna. CONSTITUTION: An antenna comprises an insulation substrate(300); the first conductive layer(310) arranged from the front end toward the rear end of the insulating substrate at the upper surface of the insulating substrate; the second conductive layer formed at the lower surface of the insulation substrate; and first and second conductive plates(320,330). The first conductive plate has a rear end attached to the first conductive layer formed at the upper surface of the front end of the insulation substrate, and the second conductive plate has a rear end attached to the second conductive layer formed at the lower surface of the front end of the insulation substrate. The first conductive plate and the second conductive plate have front ends which are parallel to each other and spaced apart from each other.

Description

Antenna and microwave detecting device

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an antenna and a microwave sensing device, and more particularly, to an antenna having a broadband characteristic fed into a microstrip and a microwave sensing device for detecting electromagnetic waves using the antenna.

Since the late 1970s, microstrips and printed antennas on boards have been developed and applied to military purposes such as airplanes, missiles and rockets, as well as commercial purposes such as satellite broadcasting and global positioning systems (GPS). Such an antenna has a tapered slot antenna (TSA), and the TSA has many advantages such as small size and weight, easy to manufacture and install, and high gain and symmetric beam pattern. The TSA is basically divided into a feed part, a matching part, and a radiating part to form various types of metal surfaces on the dielectric.

1A and 1B are top and back views of such a TSA, and with reference to FIGS. 1A and 1B, metal surfaces exist on both sides of the dielectric material and are fed into the microstrip and unbalanced by a curved surface having a radius R2. Afterwards, the microstrip is gradually changed to the metal surface by the curved surface having a radius R1 to radiate into the space from the opening surface. These TSAs have a broadband characteristic of 10-35 GHz unless impedance matching is done properly and there are no devices that depend on a specific frequency inside the antenna. However, since these TSAs are configured in a plane, only polarization incident or radiated into the plane of the TSA can be detected, and attenuation of approximately 10 dB or more occurs in the case of a polarization incident perpendicularly to the plane of the TSA. Therefore, when an antenna is required to use vertical polarization, the antenna plane is forced to stand vertically, but it is not suitable for a mechanically small shape.

Due to the above problems, it is difficult for the TSA to be applied to a radar detector that detects radio waves radiated from a speed gun used to measure vehicle speed. Therefore, a horn antenna is generally used for a radar detector currently used. A block diagram showing the configuration of the radar detector fabricated using the horn antenna is shown in FIG.

Referring to FIG. 2, when the radar detector using the horn antenna receives the radio wave radiated from the speed gun to the horn antenna 200, the received radio wave is introduced into the waveguide, from the resonator 220 by the mixer diode 210 in the waveguide. The signal is combined with the oscillated signal and changed to an intermediate frequency. The signal is demodulated by the demodulator 230. When the demodulated signal is determined to be radio waves radiated from the speed gun by the control unit 240, the presence of the speed gun is determined by the output unit 250. You will be informed. However, such a radar detector has a problem in that the structure is complicated and the frequency twice as high as the cutoff frequency of the waveguide has a large loss due to the narrow bandpass characteristic of passing only the high TE or TM mode.

An object of the present invention is to provide an antenna having a broadband characteristics.

Another object of the present invention is to provide a microwave sensing device using an antenna having a broadband characteristic.

1A and 1B are a plan view and a rear view of a conventional tapered slot antenna (TSA) A, respectively.

2 is a block diagram showing the configuration of a conventional radar detector manufactured using a horn antenna.

3A and 3B are plan and rear views, respectively, of an embodiment of an antenna having a broadband characteristic according to the present invention.

3C is an external view of an antenna capable of receiving or transmitting both vertical and horizontal polarizations for an embodiment of an antenna having a broadband characteristic according to the present invention.

4A and 4B are a plan view and a rear view of an antenna capable of receiving or transmitting microwaves for both front and rear of another embodiment of an antenna having broadband characteristics according to the present invention, respectively.

5 is a diagram illustrating the return loss of the antenna receiving only the electric field plane for an embodiment of the antenna having a broadband characteristic according to the present invention.

6 is a view showing the internal structure of an embodiment of a radar detector having an antenna having a broadband characteristics according to the present invention.

7 is a block diagram showing the configuration of an embodiment of a radar detector having an antenna having a broadband characteristic according to the present invention.

8 is a view showing the output of the first mixer according to the frequency of the input signal for an embodiment of the radar detector having an antenna having a broadband characteristics according to the present invention.

9 illustrates an input signal input to a first mixer from a antenna, a sweep signal input to a first mixer from a first local oscillator, and a demodulator for an embodiment of a radar detector having an antenna having a broadband characteristic according to the present invention. It is a figure which shows the relationship with the demodulated signal output.

In order to achieve the above technical problem, an antenna having a broadband characteristic according to the present invention, an insulating substrate; A first conductor layer formed on the upper surface of the insulating substrate and having a predetermined width from the front end to the rear end of the insulating substrate; A second conductor layer formed on the bottom surface of the insulating substrate; And first and second conductor plates, wherein a rear end of the first conductor plate is attached to a first conductor layer formed on an upper surface of the front end of the insulating substrate, and a rear end of the second conductor plate is formed on the lower surface of the front end of the insulating substrate. It is attached to the second conductor layer formed in, the front end of the first and second conductor plate is characterized in that parallel to each other and separated in space.

In order to achieve the above technical problem, a signal sensing apparatus using an antenna having a broadband characteristic according to the present invention includes an insulating substrate, a first conductor layer formed on the upper surface of the insulating substrate, and a second formed on the lower surface of the insulating substrate. And a conductor layer, a first conductor plate, and a second conductor plate, wherein a rear end of the first conductor plate is attached to the upper surface of the front end of the insulating substrate, and a rear end of the second conductor plate is attached to the lower surface of the insulating substrate. And antennas each front end of the first and second conductor plates are parallel to each other and separated in space; A demodulator for demodulating a signal received through the antenna; A central processing unit for determining the authenticity and frequency band of the demodulated signal and measuring a signal strength to output a predetermined signal; And a display unit for outputting a visual or audio signal according to the signal input from the central processing unit and receiving an output method.

Hereinafter, with reference to the accompanying drawings will be described in detail a preferred embodiment of the present invention.

3A and 3B are a plan view and a rear view of an embodiment of an antenna having a broadband characteristic according to the present invention, respectively.

3A and 3B, a first conductor layer 310 having a predetermined width in the shear direction is formed on the upper surface of the insulating substrate 300 at the rear end of the insulating substrate 300. The width of the first conductor layer 310 is preferably about 1.4 mm, and one end of the first conductor layer 310 is connected to the first conductor plate 320 and the other end is connected to a circuit for demodulating the signal received from the antenna. Is connected to the connecting portion 350.

A second conductor layer 340 is formed on the bottom surface of the insulating substrate 300, and the second conductor layer 340 is a quadrant having a front end of the insulating substrate 300, one end of the insulating substrate 300, and a constant radius. And a region formed by a line vertically connected to the one end of the quadrant and a front end of the insulating substrate 300, the other end of the insulating substrate 300, a quadrant having a constant radius and the other end at one end of the quadrant. It is formed in the part except the area made up by lines connected perpendicularly to. Meanwhile, the front end of the second conductor layer 340 is connected to the second conductor plate, has the same width as the first conductor layer 310, and the rear end is connected to the connection unit 350.

At this time, the first conductor plate 320 and the second conductor plate 330 are separated into a space at a predetermined angle, and the rear ends of the first conductor plate 320 and the second conductor plate 330 are the first. The width of the conductor layer 310 is the same, and the shears are trapezoidal shapes parallel to each other. Meanwhile, each side end of the first conductor plate 320 and the second conductor plate 330 may be manufactured to have a constant curvature.

The first conductor plate 320 and the second conductor plate 330 may be filled with an air layer having a dielectric constant of 1 and may be filled with a material having a dielectric constant similar to that of air. In this case, since an air layer having a dielectric constant of 1 exists between the two conductive plates 320 and 330, the loss occurring in the dielectric may be reduced rather than air. Vertical or horizontal polarization is emitted into the atmosphere through the first conductor plate 320 and the second conductor plate 330, or vertical or hand polarization is incident through each of the conductor plates 320 and 330.

When the radio wave is incident through the conductor plates 320 and 330, the incident wave is fed through the microstrip formed by the first conductor layer 310 and the second conductor layer 340 to demodulate the signal via the connection unit 350. Is passed to the element. In this case, the portion of the second conductor layer 340 connected to the second conductor plate 330 is preferably excavated by a constant curvature for impedance matching to minimize reflection of the incident signal.

On the other hand, when the triangular conductor plate extends from one end of the first conductor plate 320 and the second conductor plate 330, both vertical and horizontal polarizations can be detected or radiated. That is, a triangular conductor plate extends perpendicularly to each conductor plate at one end 320-1 of the first conductor plate 320 and one end 330-2 of the second conductor plate 330, and vertices of the triangle It is possible to receive or transmit both vertical and horizontal polarizations with the side facing the portion connected to the first conductor layer 310 and the second conductor layer 340, respectively. An antenna capable of receiving or transmitting both such vertical and horizontal polarizations is shown in FIG. 3C.

4A and 4B are a plan view and a rear view of another embodiment of an antenna having a broadband characteristic according to the present invention, respectively.

4A and 4B, the upper surface of the insulating substrate 400 has a constant width from the front end of the insulating substrate 400 to the rear end thereof, and has a constant width from the middle part to one end of the insulating substrate 400 vertically. A first conductor layer 410 having a T-shaped structure is formed, the end of which is connected to the connecting portion 460. As described with reference to FIGS. 3A and 3B, the first conductor layer 410 preferably has a width of about 1.4 mm, and both ends of the first conductor layer 410 have a first conductor plate 420 and a third conductor. It is connected with the plate 440.

A second conductor layer 470 is formed on the bottom surface of the insulating substrate 400, and the second conductor layer 470 has one end of the insulating substrate 400 connected to the second conductor plate and a portion of the insulating substrate 400. A region formed by one side end, a quadrant having a constant radius, and a line vertically connected to the one end at one end of the quadrant, one end of the insulating substrate 400 at the portion where the second conductor plate is connected, and the other of the insulating substrate 400. A side end, an area formed by a quadrant having a constant radius and a line vertically connected to the other end at one end of the quadrant, the other end of the insulating substrate 400 at the portion where the fourth conductor plate is connected, and one end of the insulating substrate 400 , The other end of the insulating substrate 400, the other end of the insulating substrate 400, the area of the quadrant having a constant radius and a line connected at one end of the quadrant perpendicularly to the one end, and a portion to which the fourth conductor plate is connected. calendar At one end of the quadrant, and the quadrant having a radius is formed at the portion other than the region formed by a line connected perpendicularly to the other end. Meanwhile, one end of the second conductor layer and the fourth conductor layer 420 and 440 connected to the connection part 470 has the same width as that of the first conductor layer and the third conductor layer 410 and 430.

At this time, each of the first and second conductor plates 420 and 430 and the third and fourth conductor plates 440 and 450 are separated from each other in a space at a constant angle to each other. And the rear ends of the fourth conductor plates 420, 430, 440, and 450 are equal to the width of the first conductor layer 410, and the front ends are trapezoidal shapes parallel to each other. Meanwhile, each side end of the first, second, third and fourth conductor plates 420, 430, 440, and 450 may be manufactured to have a constant curvature. The first and second conductor plates 420 and 430 and the third and fourth conductor plates 440 and 450 may be filled with an air layer having a dielectric constant of 1 and may be filled with a material having a dielectric constant similar to that of air. Through the first and second conductor plates 420 and 430 and the third and fourth conductor plates 440 and 450, vertical or horizontal polarization is emitted into the atmosphere or each conductor plate 420, 430, 440 and 450 is removed. Through this, vertical or multiple polarizations are incident.

The operation principle of the antenna described with reference to FIGS. 4A and 4B is the same as the antenna described with reference to FIGS. 3A and 3B, and furthermore, there is an advantage in that it can receive an incident radio wave in both front and rear directions. However, when the radio wave received in one direction is transmitted to the component demodulating the signal through the connection part, the radio wave is leaked in the opposite direction and propagated into the air, and at the same time, a loss occurs due to reflection due to impedance mismatch. In addition, as described with reference to FIG. 5, a triangular-shaped conductor plate may be extended to the side ends of the pair of conductor plates in a diagonal direction to detect both vertical and horizontal polarizations.

5 is a view showing the return loss of the antenna receiving only the electric field plane for an embodiment of the antenna according to the present invention.

Referring to FIG. 5, it can be seen that the reflection loss of 9.613 dB when the frequency of the input signal is 10.5 GHz, 11.856 dB when 24 GHz, and 12.454 dB when 35 GHz occurs. Therefore, it can be seen that the antenna has a broadband characteristic of 10 to 35 GHz unless there is a component that depends on a specific frequency inside the antenna.

The above-described antennas can be applied to various fields, and are particularly suitable for radar detectors for detecting radio waves emitted from speed guns for vehicle speed measurement. Taking the antenna described with reference to FIGS. 3A and 3B as an example, a microstrip having a width of 1.4 mm is formed on a Teflon substrate having a length, width, and height of 18, 18, and 0.5 mm, respectively, and the bottom, top, and height of 18, A radar detector with 1.4 and 32 mm trapezoidal conductor plates connected to the microstrip and an antenna with a 14 mm gap between the bases of each conductor plate shows 4.5 dB of directivity for 10 GHz radio waves. have.

The speed gun currently used uses 10.525GHz, 24.15GHz, and microwaves with frequencies of 33.6 ~ 36GHz.The principle of operation is to use the Doppler effect to radiate the radio waves toward the vehicle and to reflect the reflected waves from the vehicle. Calculate the speed. In order to confirm the existence of such a speed gun in advance, it is necessary to detect microwaves emitted from the speed gun in advance using a highly sensitive antenna, and the radar detector detects the microwaves emitted from the speed gun through an acoustic signal or a light emitting element. The driver will be warned in advance.

6 is a view showing the internal structure of the radar detector with an antenna according to an embodiment of the present invention, Figure 7 is a block diagram showing the configuration of the radar detector with an antenna according to an embodiment of the present invention. 6 and 7 some components are omitted for convenience of description.

Referring to FIG. 6, the radar detector 600 according to the present invention performs frequency conversion and amplification of a signal received through the antenna unit 610 and the antenna unit 610 for receiving microwaves, and converts the amplified signal into an intermediate frequency. A demodulator 620 for demodulating and filtering the demodulated signal, a central processor 630 and a central processor 630 for determining the authenticity and frequency band of the filtered signal and calculating a signal strength to output a predetermined signal. And a display unit 640 for outputting a visual or audio signal according to a signal input from the user, and receiving an output method. On the other hand, if the antenna is mounted on both the front and rear of the radar detector there is an advantage that can confirm the presence of the speed gun in the opposite direction as well as the traveling direction of the vehicle.

Referring to FIG. 7, the demodulator 620 combines an input signal and a signal of the first local oscillator 710 to output a signal having a first intermediate frequency, and a predetermined range (for example, The first local oscillator 710 and the first local oscillator 710 are sawtooth waves according to the carrier detected by the first local oscillator 710 and the carrier detector 780 for outputting a signal whose frequency varies from 11.4 GHz to 11.7 GHz. A signal of the first intermediate frequency input from the sweep circuit 720, the amplifier 730 amplifying the signal of the first intermediate frequency input from the first mixer 700, and A second mixer 740 that combines the signals of the second local oscillator 750 or 760 and outputs a signal having a second intermediate frequency, and a demodulator 770 that demodulates an original signal from a signal input from the second mixer 740. And detecting a carrier from a signal input from the demodulator 770 and sweeping the circuit according to the detected carrier frequency. And a carrier detection unit 780 for controlling the operation of 720.

The microwave received from the antenna unit 610 is input to the demodulator 620. The first mixer combines the input microwave with the signal of the first local oscillator 710 to output a signal of the first intermediate frequency. For example, when a microwave having a frequency of 24.150 GHz is input to the first mixer, the microwave is coupled with a second harmonic signal of the first local oscillator 710 having a frequency of 22.8 to 23.4 GHz to provide a difference of 0.75 to 1.35 GHz. The signal is converted into a signal of a first intermediate frequency having a frequency.

Among the signals of the first intermediate frequency described above, signals having frequencies of 989.3 MHz and 1010.7 MHz may generate signals of the second intermediate frequency. The signals having frequencies of 989.3 MHz and 1010.7 MHz are generated by the sweep circuit 720 when the output signal of the first local oscillator 710 is swept between 11.4 and 11.7 GHz and input to the amplifier 730.

Sweep circuit 720 is a component for sweeping the output signal of the first local oscillator 710 to detect a microwave of a wide band is driven by the central processing unit 790, the operation is held by the carrier detection unit 780 do.

8 is a diagram illustrating an output of a first mixer according to a frequency of an input signal. In FIG. 8, a signal denoted by 1 GHz_L is a signal having a frequency of 10.7 MHz lower than 1 GHz, and a signal denoted by 1 GHz_H is a signal having a frequency 10.7 MHz higher than 1 GHz. The signals labeled 300 MHz_L and 300 MHz_H are also represented by the same principle.

The amplifier 730 amplifies the signal of the first intermediate frequency input from the first mixer 700 and outputs the amplified signal to the second mixer. The second mixer 740 combines a signal of a first intermediate frequency input from the amplifier 730 with a signal having a frequency of 300 MHz or 1 GHz input from the second local oscillators 750 and 760 to signal the second intermediate frequency. Is output to the demodulator 770.

On the other hand, when a signal having a frequency of 1010.7 MHz is input to the second mixer 740, it is combined with an output signal of the second local oscillator 760 which outputs a signal having a frequency of 1 GHz among the second local oscillators 750 and 760. Therefore, a signal 1 GHz_H having a frequency of 10.7 MHz, which is a difference between two signals, is output from the second mixer 740.

The second local oscillators 750 and 760 are composed of two local oscillators having a reference number 750 for outputting a signal of 300 MHz and two local oscillators having a reference number 760 for outputting a signal of 1 GHz. The local oscillator operates and the local oscillator is selected by the central processing unit 790 according to the frequency band of the input signal.

The demodulator 770 is a component that demodulates the microwaves emitted from the speed gun from the second intermediate frequency signal input from the second mixer 740. For example, the demodulator 770 is a case in which a signal having a frequency of 24.150 GHz is input. When a signal having a frequency of 989.3 MHz is input to the mixer 740, the two local oscillators 750 and 760 combine with an output signal of the second local oscillator 760 that outputs a signal having a frequency of 1 GHz. A signal 1 GHz_L having a frequency of 10.7 MHz, which is a difference, is output from the second mixer 740. The demodulator 770 demodulates the corresponding signal and outputs two pulses when a signal having a frequency of 10.7 MHz_L or 10.7 MHz_H is input from the second mixer 740.

9 is a diagram illustrating a relationship between an input signal input from an antenna to a first mixer, a sweep signal input from a first local oscillator to a first mixer, and a demodulation signal output from a demodulator. In FIG. 9, the input signal 900 indicates only the presence or absence of a signal, and the sweep signal 910 is a sawtooth wave having a predetermined period. The first local oscillator uses a sweep circuit to demodulate a frequency that is a single carrier. The falling end of the pulse outputted from the circuit is modified to have a predetermined slope. When the signal is received from the antenna 610, the input signal 900 is present, the first mixer 700 is combined with the sweep signal 910 is converted into a first intermediate frequency signal and a second intermediate frequency signal demodulator 770 ), The demodulator 770 outputs two pulses according to the period of the sweep signal 910.

The carrier detector 780 performs waveform shaping on the demodulated signal input from the demodulator 770 and outputs the demodulated signal to the central processing unit 790. Meanwhile, the carrier detector 780 also performs a function of controlling the operation of the sweep circuit 720 according to the frequency band of the carrier of the demodulated signal.

The central processing unit 790 calculates the authenticity of the signal, the band judgment, the signal strength, etc. from the interval between the two pulses input from the carrier detection unit 780, the width of each pulse, and the like. Run 640 to notify the user of the presence of a speed gun.

The display unit 640 outputs a visual or audio signal according to a signal input from the central processing unit 630. The display unit 640 includes one or more electroluminescent devices (eg, LEDs) or speakers for outputting a visual or audio signal, and whether the user outputs a visual or audio signal using an output method selection button. It is desirable to be able to select.

The above-described embodiment is related to the radar detector equipped with the antenna described with reference to FIGS. 3A and 3B, but with the slight modification, the presence of the speed gun in both the front and the rear, with the antenna described with reference to FIGS. 4A and 4B. Can be detected. Furthermore, as described with reference to FIG. 5, the radar detector capable of detecting both vertical and horizontal polarizations can be provided by modifying and using the antenna described with reference to FIGS. 3A, 3B, and e, FIGS. 4A and 4B.

Those skilled in the art to which the present invention described above belongs will understand that the present invention can be implemented in other specific forms without changing the technical spirit or essential features. Therefore, the above-described embodiments are to be understood as illustrative in all respects and not as restrictive. The scope of the present invention is shown by the following claims rather than the detailed description, and all changes or modifications derived from the meaning and scope of the claims and their equivalents should be construed as being included in the scope of the present invention. do.

According to the antenna having the broadband characteristic according to the present invention, the structure of the antenna is simplified, the size of the application device to which the antenna is mounted is reduced, and unlike the horn antenna, the conductor surface is simple, and deformation and application are free. In addition, since the dielectric is not used at the receiving end of the antenna, it is possible to manufacture an antenna having low loss and broadband characteristics even at a high frequency. Furthermore, the conductor surface of the antenna can be installed before and after the antenna to receive radio waves for both the front and rear sides, and the vertical and horizontal flat waves can be simultaneously transmitted and received by extending the conductor surface of the antenna vertically.

On the other hand, according to the microwave sensing device using an antenna having a broadband characteristics according to the present invention, by using an antenna having a broadband characteristics, it is possible to receive microwaves of various frequency ranges and to detect the vertical and horizontal polarization simultaneously or both front and rear You can check for the presence of a speed gun. In addition, unlike a radar detector using a horn antenna, the mixer diode and the resonator are not required, thereby simplifying the structure of the microwave detection device.

Claims (17)

Insulating substrate; A first conductor layer formed on the upper surface of the insulating substrate and having a predetermined width from the front end to the rear end of the insulating substrate; A second conductor layer formed on the bottom surface of the insulating substrate; And Including first and second conductor plates, The rear end of the first conductor plate is attached to the first conductor layer formed on the upper surface of the front end of the insulating substrate, the rear end of the second conductor plate is attached to the second conductor layer formed on the lower surface of the front end of the insulating substrate, And the front ends of the first and second conductor plates are parallel to each other and separated in space. The method of claim 1, wherein the second conductor layer, It is divided into a feed part and an impedance matching part, The feed portion is formed into a rectangle from the rear end of the insulating substrate, The impedance matching unit is an antenna, characterized in that the upper side is connected to the second conductor plate and is the same as the width of the first conductor layer, the lower side is in contact with the feeder and both hypotenuses are trapezoidally shaped by a constant curvature. . The method of claim 1, And each of the first and second conductor plates has a trapezoid having an upper side equal to a width of the first conductor layer and a lower side having a predetermined length larger than the upper side. The method of claim 3, wherein And an hypotenuse of the first and second conductor plates has a predetermined curvature. The method of claim 1, Each of the first and second conductor plates is a trapezoid having an upper side equal to the width of the first conductor layer and a lower side having a predetermined length larger than the upper side, and the hypotenuse and the height are the same as the hypotenuse and the height of each conductor plate. A conductor plate of which is connected to one hypotenuse of each conductor plate and extends toward each conductor plate. Insulating substrate; A first conductor layer formed on the upper surface of the insulating substrate and having a predetermined width from the front end to the rear end of the insulating substrate; A second conductor layer formed on the bottom surface of the insulating substrate; And Including first, second, third and fourth conductor plates, The rear end of the first conductor plate is attached to the first conductor layer formed on the upper surface of the front end of the insulating substrate, the rear end of the second conductor plate is attached to the second conductor layer formed on the lower surface of the front end of the insulating substrate, The rear end of the third conductor plate is attached to the first conductor layer formed on the upper surface of the rear end of the insulating substrate, the rear end of the fourth conductor plate is attached to the second conductor layer formed on the lower surface of the rear end of the insulating substrate, Each front end of the first and second conductor plates is parallel to each other and separated in space, and each front end of the third and fourth conductor plates is parallel to each other and separated in space, The first conductor layer has a predetermined width on the upper surface of the insulating substrate from the front end of the insulating substrate to the rear end, and has a constant width from the middle of the first conductor layer to one end of the insulating substrate and is formed vertically. An antenna, characterized in that the structure. The method of claim 6, The second conductor layer is divided into a first impedance matching part, a second impedance matching part, and a feeding part, The first impedance matching part has an upper side connected to the second conductor plate, the width of the first conductor layer is the same, and the lower side is in contact with the feeding part, and both hypotenuses are formed in a trapezoid which is dug by a constant curvature. The second impedance matching part has an upper side connected to the fourth conductor plate, the width of the first conductor layer is the same, and the lower side is in contact with the feeding part, and both hypotenuses are formed in a trapezoidal shape cut by a constant curvature. The power supply unit is an antenna, characterized in that formed in a rectangle between the first impedance matching unit and the second impedance matching unit. The method of claim 6, And each of the first, second, third and fourth conductor plates has a trapezoid having an upper side equal to a width of the first conductor layer and a lower side having a predetermined length larger than the upper side. The method of claim 8, And an hypotenuse of the first, second, third and fourth conductor plates has a predetermined curvature. The method of claim 6, Each of the first, second, third, and fourth conductor plates has a trapezoid having a predetermined length with an upper side equal to the width of the first conductor layer and a lower side larger than the upper side, and hypotenuse and height of each conductor plate. And a conductor plate of a triangle equal to the hypotenuse and the height extends toward each of the conductor plates opposed to each other by being connected to one hypotenuse of each conductor plate. An insulating substrate, a first conductor layer formed on an upper surface of the insulating substrate, a second conductor layer formed on a lower surface of the insulating substrate, a first conductor plate, and a second conductor plate, wherein the rear end of the first conductor plate is An antenna attached to an upper surface of an insulator substrate, a rear end of the second conductor plate is attached to a lower surface of the insulator substrate, and each front end of the first and second conductor plates is parallel to each other and separated in space; A demodulator for demodulating a signal received through the antenna; A central processing unit for determining the authenticity and frequency band of the demodulated signal and measuring a signal strength to output a predetermined signal; And And a display unit configured to output a visual or audio signal according to a signal input from the central processing unit, and to select an output method. The method of claim 11, The first conductor layer is formed to have a constant width from the front end of the insulating substrate to the rear end, and the second conductor layer is divided into a feeding part and an impedance matching part. The feed portion is formed into a rectangle from the rear end of the insulating substrate, The impedance matching part has an upper side connected to the second conductor plate and having the same width as that of the first conductor layer, a lower side contacting the feeding part, and both hypotenuses are formed in a trapezoid shaped by a constant curvature. Sensing device. The method of claim 11, Further comprising third and fourth conductor plates, The rear end of the third conductor plate is attached to the first conductor layer formed on the upper surface of the rear end of the insulating substrate, and the rear end of the fourth conductor plate is attached to the second conductor layer formed on the lower surface of the rear end of the insulating substrate. Shears of the third and fourth conductor plates are parallel to each other and separated in space, The first conductor layer has a predetermined width on the upper surface of the insulating substrate from the front end of the insulating substrate to the rear end and is vertically formed with a constant width from the middle of the first conductor layer to one end of the insulating substrate. Signal sensing device, characterized in that the structure. The method of claim 11, Each of the conductor plates of the antenna is a trapezoid having a predetermined length whose upper side is equal to the width of the first conductor layer and whose lower side is larger than the upper side, and the hypotenuse and height are triangular conductors equal to the hypotenuse and height of each conductor plate. A signal sensing device, characterized in that the plate is connected to one hypotenuse of each conductor plate and extends toward each conductor plate. The method of claim 11, A hypotenuse of each conductor plate of the antenna has a predetermined curvature. The method of claim 11, wherein the demodulation unit, A first local oscillator for outputting a signal of variable frequency; A first combiner for combining a signal received through the antenna and an output signal of the first local oscillator to output a signal having a frequency of a value of a frequency difference between the two signals; An amplifier for amplifying a signal input from the first combiner; A plurality of second local oscillators for outputting signals of different frequencies; A second combiner for combining a signal input from the amplifier and a signal input from the second local oscillator and outputting a signal having a frequency having a value of a frequency difference between the two signals; And A demodulator for demodulating a signal input from the second combiner and outputting a pulse; And a carrier detecting means for detecting a carrier from the signal input from the demodulator and filtering the waveform. The method of claim 16, And a signal output from the first local oscillator is a sawtooth wave having a predetermined period.