KR101765865B1 - Transmission apparatus of electromagnetic wave - Google Patents

Abstract

Disclosed is an electromagnetic wave transmission apparatus capable of controlling transmittance of an electromagnetic wave. According to an embodiment of the present invention, the electromagnetic wave transmission apparatus comprises: a first dielectric substrate on which first meta atoms are periodically arranged and through which a frequency primarily transmits; a second dielectric substrate on which second meta atoms are periodically arranged and installed to be separated from the first dielectric substrate such that the frequency which passes through the first dielectric substrate secondarily transmits therethough; and a separation distance varying unit connected with any one of the first dielectric substrate or the second dielectric substrate by an operation rod operated to move forwards or backwards, varying a separation distance formed between the substrate and the separation distance varying unit. The first and second dielectric substrates allow an electromagnetic wave with a particular frequency band spreading to be focused. The separation distance is varied by the separation distance varying unit, and a transmittance of the focused and transmitted electromagnetic wave is controlled. The separation distance varying unit includes an actuator connected with any one of the first dielectric substrate or the second dielectric substrate to move the substrate. The actuator controls a separation distance formed between the first dielectric substrate and the second dielectric substrate by moving any one of the first dielectric substrate or the second dielectric substrate connected with each other by a guide rail while the operation rod moves forwards or backwards.

Description

TECHNICAL FIELD [0001] The present invention relates to an electromagnetic wave transmission device,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnetic wave transmission device, and more particularly, to an electromagnetic wave transmission device installed between a transmitter and a receiver to transmit an electromagnetic wave having a specific frequency band.

Generally, electromagnetic waves are widely used in various fields such as home appliances, Wi-Fi, radars, wireless power transmission systems, and autonomous vehicles.

This electromagnetic wave refers to a kind of electromagnetic energy generated in the flow of electricity and magnetism, which is also called an electron wave, and has a property that an electric field and a magnetic field repeatedly spread as waves.

Electromagnetic waves are classified into three types: VLF of 3 to 30 kHz, LF of 30 to 300 kHz, UHF of 300 to 3,000 MHz, and polarized shortwave of 3 to 30 GHz SHF), and ultrahigh short wave (EHF) in the 30 to 300 GHz band.

However, according to the electromagnetic waves having various frequency bands, as a result of mixed propagation in the air, signal interference generated by each other and environment in which electromagnetic waves propagate inevitably accompany a noise signal, that is, noise.

The noise associated with such electromagnetic waves appears as various disadvantages such as a decrease in the reception ratio of the electromagnetic wave and a shortening of the reach distance of the electromagnetic wave.

The matters described in the background section are intended to enhance the understanding of the background of the invention and may include matters not previously known to those skilled in the art.

Korean Patent Publication No. 10-2012-0031735 (Apr. 04, 2012)

An embodiment of the present invention provides an electromagnetic wave transmission device that focuses an electromagnetic wave having a specific frequency band spreading from a transmitter and controls the transmittance of an electromagnetic wave having a specific frequency band that is focused and transmitted .

An electromagnetic wave transmitting device according to an embodiment of the present invention includes a first dielectric substrate on which first meta-atoms are periodically arranged and a frequency is firstly transmitted; A second dielectric substrate on which second meta-atoms are periodically arranged and spaced apart from the first dielectric substrate, the frequency being transmitted through the first dielectric substrate being secondarily transmitted; And spacing distance varying means connected to either one of the first dielectric substrate or the second dielectric substrate through a forward / backward actuated operation rod to vary a spacing distance formed therebetween; Wherein the first dielectric substrate and the second dielectric substrate converge electromagnetic waves having a specific frequency band that is spread out, and the mutual spaced distance is variable through the distance-varying means, and the transmittance of the electromagnetic wave, An actuator for connecting the first dielectric substrate or the second dielectric substrate to the first dielectric substrate or the second dielectric substrate and moving the first dielectric substrate or the second dielectric substrate; Wherein the actuator moves either one of the first dielectric substrate or the second dielectric substrate connected to each other through the guide rails along the guide rails while the operation rod is being moved forward and backward, The distance formed between the dielectric substrate and the second dielectric substrate can be adjusted.

Further, in the electromagnetic wave transmitting device according to the embodiment of the present invention, the first and second meta-atoms may have a size of between 2 mm and 5 mm in inner diameter and a ring of outer diameter between 6 mm and 9 mm . ≪ / RTI >

Further, in the electromagnetic wave transmitting device according to the embodiment of the present invention, the first and second meta-atoms may have a size of between 11 mm and 14 mm in inner diameter, and a ring of outer diameter between 23 mm and 27 mm . ≪ / RTI >

Further, in the electromagnetic wave transmitting device according to the embodiment of the present invention, the first meta-atoms are arranged to face each other on both surfaces of the first dielectric substrate, and the second meta-atoms are arranged on both surfaces of the second dielectric substrate As shown in FIG.

In the electromagnetic wave transmitting device according to the embodiment of the present invention, the first and second meta-atoms may be made of silver (Ag) or copper (Cu).

The distance between the first dielectric substrate and the second dielectric substrate is adjusted to a distance of 7 mm to 40 mm while a transmittance of an electromagnetic wave having a frequency band of 4 GHz to 11 GHz Can be adjusted.

Also, in the electromagnetic wave transmitting device according to the embodiment of the present invention, the distance between the first dielectric substrate and the second dielectric substrate is adjusted to a distance between 30 mm and 90 mm, and an electromagnetic wave having a frequency band of 2.3 GHz to 3.5 GHz The transmittance can be adjusted.

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Also, the electromagnetic wave transmitting device according to the embodiment of the present invention mechanically connects the first dielectric substrate and the second dielectric substrate with the transmission unit side to rotate the first dielectric substrate and the second dielectric substrate together And may further include rotating means.

In addition, in the electromagnetic wave transmission device according to the embodiment of the present invention, as the distance between the first dielectric substrate and the second dielectric substrate increases, the frequency band of the electromagnetic wave transmitted through the first dielectric substrate and the second dielectric substrate becomes a low frequency band And can have a correlation that is moved.

Embodiments of the present invention can focus electromagnetic waves having a specific frequency band spreading from a transmitter through a pair of dielectric substrates on which meta-atoms are periodically arranged.

In addition, embodiments of the present invention can control the transmittance of an electromagnetic wave having a specific frequency band that is focused and transmitted through varying a separation distance formed between a pair of dielectric substrates.

Accordingly, the embodiment of the present invention can filter the noise accompanying the electromagnetic wave having the specific frequency band to be focused, and can improve the signal strength and extend the reach of the electromagnetic wave as the noise is filtered.

In addition, effects obtainable or predicted by the embodiments of the present invention will be directly or implicitly disclosed in the detailed description of the embodiments of the present invention. That is, various effects to be predicted according to the embodiment of the present invention will be disclosed in the detailed description to be described later.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic view showing an installation state of an electromagnetic wave transmitting device according to an embodiment of the present invention; FIG.
2 is a perspective view of first and second dielectric substrates applied to an electromagnetic wave transmitting apparatus according to an embodiment of the present invention.
3 is a schematic plan view of a rotating means applied to an electromagnetic wave transmitting device according to an embodiment of the present invention.
4 is a graph showing experimental results showing the transmittance of an electromagnetic wave having a frequency band of 5 to 10 GHz transmitted through the electromagnetic wave transmitting device according to the embodiment of the present invention.
5 is a graph showing experimental results showing the transmittance of an electromagnetic wave having a frequency band of 2.4 to 3.4 GHz transmitted through the electromagnetic wave transmitting device according to the embodiment of the present invention.

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

It is to be understood, however, that the present invention is not limited to the illustrated embodiments, and that various changes and modifications may be made without departing from the spirit and scope of the invention. .

In order to clearly illustrate the embodiments of the present invention, parts that are not related to the description are omitted. In the following description, the names of the components are denoted by first and second names, And is not necessarily limited to the order.

And throughout the specification, when an element is referred to as " comprising ", it means that it can include other elements as well, without excluding other elements unless specifically stated otherwise.

The electromagnetic wave transmitting device according to the embodiment of the present invention can focus electromagnetic waves having a specific frequency band spreading from a transmitter through a pair of dielectric substrates periodically arranged with meta atoms, And the transmittance of an electromagnetic wave having a band is controlled.

The electromagnetic wave transmitting device according to the embodiment of the present invention can be widely used in a wide variety of fields using electromagnetic waves, such as Wi-Fi, radar, communication device, autonomous traveling system of vehicle, and wireless power transmission system. The application to a specific field is not limited.

2 is a perspective view of first and second dielectric substrates applied to a frequency peak adjusting apparatus according to an embodiment of the present invention. FIG. 2 is a perspective view of a frequency peak adjusting apparatus according to an embodiment of the present invention.

1 and 2, an electromagnetic wave transmitting device according to an embodiment of the present invention includes a first dielectric substrate 20 on which a first metatron 10 is arranged, a second dielectric substrate 20 on which a second metatron 30 is arranged, A dielectric substrate 40, and spacing distance varying means 50. [

The first dielectric substrate 20 on which the first meta atoms 10 are arranged and the second dielectric substrate 40 on which the second meta atoms 30 are arranged can be manufactured by artificially implementing electromagnetic characteristics (Metamaterials).

These metamaterials are mainly used for absorbing electromagnetic waves. In particular, many researches have revealed that the metamaterial can concentrate at specific points without diffusing light. Accordingly, the meta-material can play the role of the most ideal high-performance lens.

The most important element of such a meta-material is a periodically arranged meta-atom. Meta-atoms vary in amount and absorption rate of electromagnetic waves absorbed according to conditions such as shape, size, material, appear.

Accordingly, studies have been actively conducted on the shape, size, material, arrangement, and the like of the meta-atoms in order to optimize the performance such as the smooth absorption of the electromagnetic waves by the meta-atoms.

Hereinafter, the first dielectric substrate 10 and the second dielectric substrate 40 constituting the meta material widely used in the art will be briefly described, and the first meta-atoms 10 ) And the second meta atom 30 will be described in detail.

The first dielectric substrate 20 may be made of FR (Epoxy Resin) -4 substrate. The FR-4 substrate is formed of glass fiber impregnated with epoxy resin in several layers.

In this first dielectric substrate 20, the first meta-atoms 10 are periodically arranged to face each other on both sides. At this time, the first meta atoms 10 are arranged periodically with the same size.

Hereinafter, the first meta atom 10 will be described in detail.

The first meta-atom 10 may be in the form of a ring having a silver (Ag) or copper (Cu) material. In this case, the ring-shaped first metatron 10 may have an inner diameter D1 of between 2 mm and 5 mm, and an outer diameter D2 of between 6 mm and 9 mm.

The ring-shaped first metatron 10 may have an inner diameter D1 of between 11 mm and 14 mm and an outer diameter D2 of between 23 mm and 27 mm.

The numerical range for defining the size of the first meta-atom 10 is a numerical range in which an electromagnetic wave having a specific frequency band spreading from 4 GHz to 11 GHz or 2.3 GHz to 3.5 GHz is applied to the first dielectric substrate 20, 2 dielectric substrate 40 while focusing the same.

In the embodiment of the present invention, it is preferable that the first dielectric substrate 20 and the second dielectric substrate 40 are transmitted while focusing electromagnetic waves having a frequency band of 5 to 10 GHz or 2.4 to 3.4 GHz.

When the numerical value is more than or less than this numerical value, electromagnetic waves having a specific frequency band, that is, a frequency band of 5 to 10 GHz or 2.4 to 3.4 GHz can not be transmitted while being converged, and the reason is confirmed through concrete experimental data described below .

The second dielectric substrate 40 is disposed at a distance L from the first dielectric substrate 20, and the second meta-atoms 30 are periodically arranged.

The second dielectric substrate 40 and the second meta-atoms 30 have the same configuration and operation as the first dielectric substrate 20 and the meta-atoms 10 described above, and are arranged at the same intervals. Is omitted.

According to the first dielectric substrate 20 and the second dielectric substrate 40 having such a configuration, an electromagnetic wave having a specific frequency band spreading from the transmitter TR is first transmitted through the first metatron 10, And is primarily transmitted through the substrate 20 while being converged.

Then, the electromagnetic waves transmitted through the first dielectric substrate 20 are focused on the second dielectric substrate 40 through the second meta-atoms 30 and then transmitted through the second dielectric substrate 40 and propagated to the receiver RE side.

Although the first dielectric substrate 20 and the second dielectric substrate 40 are illustrated as being installed at the midpoint between the transmitter TR and the receiver RE, It is preferable to be installed in close proximity to the side.

The spacing distance varying means 50 is configured to vary the distance L between the first dielectric substrate 20 and the second dielectric substrate 40 to transmit the first dielectric substrate 20 and the second dielectric substrate 40 The transmittance of the electromagnetic wave having a specific frequency band is adjusted.

The spacing distance varying means 50 may comprise an actuator 51 connected to either one of the first dielectric substrate 20 or the second dielectric substrate 40 to move them.

The actuator 51 may be configured such that the actuating rod 52 which is operated in the forward and backward directions is connected to either the first dielectric substrate 20 or the second dielectric substrate 40. Hereinafter, Is connected to the second dielectric substrate 40 will be described.

These actuators 51 may include all types of actuators 51 that move the second dielectric substrate 40 through operation of the actuating rod 52 during operation, It is not limited.

For example, the actuator 51 includes a lead screw, a moving block installed on the lead screw, an operating rod 52 mounted on the moving block and operated forward / backward while the moving block is moved during rotation of the lead screw, (Not shown).

Accordingly, the second dielectric substrate 40 can be moved forward and backward while the operation rod 52 is operated forward and backward. At this time, the rotation of the lead screw may be performed manually through a separate handle, or may be electrically operated through a drive motor.

Also, the actuator 51 can be applied to various types of cylinders in which the operating rod 52 is operated forward / backward by pneumatic pressure.

The spacing distance varying means 50 having such a configuration may be configured such that the spacing distance L formed between the first dielectric substrate 20 and the second dielectric substrate 40 is set to a distance between 7 mm and 40 mm or a distance between 30 mm and 90 mm .

The numerical range that defines the separation distance L as described above may be set to a specific frequency band that is transmitted through the first dielectric substrate 20 or the second dielectric substrate 40, that is, between 4 GHz and 11 GHz, or between 2.3 GHz and 3.5 GHz To control the transmittance of an electromagnetic wave having a frequency band.

In the embodiment of the present invention, it is desirable to adjust the transmittance of the electromagnetic wave having a frequency band between 5 GHz and 10 GHz or between 2.4 GHz and 3.4 GHz, and when it is more than or less than the numerical range defining the distance L, It may be difficult to control the transmittance of electromagnetic waves having a frequency band between 10 GHz to 10 GHz or between 2.4 GHz and 3.4 GHz.

The reason is confirmed through concrete experimental data described below.

The electromagnetic wave transmitting device according to the embodiment of the present invention may be provided with a guide rail 60 on which a scale 61 is displayed between the first dielectric substrate 20 and the second dielectric substrate 40.

The guide rail 60 may be installed on the lower or upper portion of the first dielectric substrate 20 and the second dielectric substrate 40, and may be installed at the lower portion in the embodiment of the present invention.

The first dielectric substrate 20 and the second dielectric substrate 40 may be installed in a manner that the lower portion of the first dielectric substrate 20 and the second dielectric substrate 40 are inserted into the guide rail 60, (Not shown) provided at a lower portion of the guide rail 60. [

According to the guide rail 60, the movement of the first dielectric substrate 20 or the second dielectric substrate 40 can be stably guided by the operation of the actuator 51, It is possible to accurately confirm the spaced distance L between the first dielectric substrate 20 and the second dielectric substrate 40.

When the actuator 51 is omitted, the user can easily move the first dielectric substrate 20 or the second dielectric substrate 40 along the guide rail 60 by hand.

Meanwhile, the frequency peak adjusting apparatus according to the embodiment of the present invention includes a transmitter TR, a first dielectric substrate 20 and a second dielectric substrate 40, 1 rotating unit 70 for rotating the first dielectric substrate 20 and the second dielectric substrate 40.

3 is a schematic plan view of a rotating means applied to an electromagnetic wave transmitting device according to an embodiment of the present invention.

Referring to FIG. 3, the rotating means 70 includes a rotating frame 71 and a hinge 72. The rotary frame 71 connects the transmitter TR with the first dielectric substrate 20 and the hinge 72 rotatably couples one side of the rotary frame 71 with the transmitter TR.

Here, the rotary frame 71 may be any type of frame that can connect the transmitter TR and the first dielectric substrate 20, and is not limited to any specific form.

According to the rotation means 70, the first dielectric substrate 20 and the second dielectric substrate 40, which are connected to each other via the rotary frame 71 with respect to the hinge 72, can be rotated.

According to this, it is possible to change the transmission direction of the electromagnetic wave transmitted through the first dielectric substrate 20 and the second dielectric substrate 40.

Hereinafter, the electromagnetic wave having a specific frequency band is transmitted through the first dielectric substrate 20 and the second dielectric substrate 40 through specific experimental data to control the transmittance.

4 is a graph showing experimental results showing the transmittance of an electromagnetic wave having a frequency band of 5 to 10 GHz transmitted through the electromagnetic wave transmitting device according to the embodiment of the present invention.

In this experiment, the first meta-atom 10 and the second meta-atom 30 having a dielectric constant of 4.2, a dielectric loss of 0.025, an inner diameter D1 of 3.5 mm and an outer diameter D2 of 7 mm A first dielectric substrate 20 and a second dielectric substrate 40 which are periodically arranged are used.

4, when the distance L between the first dielectric substrate 20 and the second dielectric substrate 40 is adjusted to be between 8 mm and 40 mm, the transmittance of electromagnetic waves having a specific frequency band is controlled Able to know.

In particular, it can be seen that the transmittance of an electromagnetic wave having a specific frequency band, that is, a frequency band between 5 GHz and 8.2 GHz, is larger than 1 in a section between 20 mm and 40 mm.

The electromagnetic wave having a frequency band of 5 GHz to 10 GHz is transmitted through the first dielectric substrate 20 and the second dielectric substrate 40 in accordance with the distance L between the first dielectric substrate 20 and the second dielectric substrate 40, It can be confirmed that the transmittance through the substrate 40 is controlled.

Assuming that an electromagnetic wave having a frequency band of 5 GHz is transmitted through the first dielectric substrate 20 and the second dielectric substrate 40 with the separation distance L set at 40 mm, The transmittance can be increased, and the noise having another frequency band accompanying the electromagnetic wave can be filtered while suppressing the relative transmission.

5 is a graph showing experimental results showing the transmittance of an electromagnetic wave having a frequency band of 2.4 to 3.4 GHz transmitted through the electromagnetic wave transmitting device according to the embodiment of the present invention.

In this experiment, the first meta-atom 10 and the second meta-atom 30 having a dielectric constant = 4.2 dielectric loss = 0.025, an inner diameter D1 of 12.8 mm and an outer diameter D2 of 25 mm, The first dielectric substrate 20 and the second dielectric substrate 40 are used.

5, when the distance L between the first dielectric substrate 20 and the second dielectric substrate 40 is adjusted to a length between 45 mm and 80 mm, the transmittance through which electromagnetic waves having a specific frequency band is transmitted It can be seen that it is regulated.

In particular, it can be seen that the transmittance of an electromagnetic wave having a specific frequency band, that is, a frequency band between 2.4 GHz and 3.4 GHz, in the interval between 45 mm and 80 mm, which is the separation distance L, approaches 1.

The electromagnetic wave having a frequency band of 2.4 GHz to 3.4 GHz is transmitted to the first dielectric substrate 20 and the second dielectric substrate 40 according to the distance L between the first dielectric substrate 20 and the second dielectric substrate 40, 2 dielectric substrate 40 can be controlled.

Hereinafter, an electromagnetic wave transmitting device according to an embodiment of the present invention is applied to a Wi-Fi.

Generally, Wi-Fi uses an electromagnetic wave having a frequency band of 2.4 GHz, but the frequency band of 2.4 GHz shows a tendency to remarkably decrease in speed due to frequency interference and the like.

In order to solve this problem, the frequency band of 5 GHz is currently being converted. However, the frequency band of 5 GHz is advantageous in that it does not interfere with the 2.4 GHz frequency band as described above, but has a disadvantage that the arrival distance is shorter than the frequency band of 2.4 GHz due to the characteristics of the frequency band.

In this case, when the electromagnetic wave transmitting device according to the embodiment of the present invention is applied, electromagnetic waves having a frequency band of 5 GHz are focused, while electromagnetic waves are filtered while filtering noise having a different frequency band, The reaching distance can be extended.

The distance L between the first dielectric substrate 20 and the second dielectric substrate 40 may be defined by the following equation.

이다. 여기서, L은 인덕턴스, C는 캐피턴스이다.In general, the transmission frequency of a metamaterial is much explained by using an LC (Inductor-circuit) circuit or a RLC (Resistor-Inductor-Capacitor) circuit. For an LC circuit, the transmission frequency is

to be. Where L is the inductance and C is the capacitance.

이다. 여기서, c는 광속, l은 메타 원자의 크기, m과 n은 정수이다.Further, assuming that the metamaterial is resonant, the frequency is

to be. Here, c is the luminous flux, l is the size of the meta atom, and m and n are integers.

Considering the transmission frequency in the present invention from the viewpoint of such a formula,

가 된다. 여기서, c는 광속, d는 제1 유전체 기판(20) 및 제2 유전체 기판(40) 사이의 이격거리(L)이다.

. Here, c is the luminous flux, and d is the separation distance L between the first dielectric substrate 20 and the second dielectric substrate 40.

It can be seen from these equations that as the distance L increases, the frequency band of the electromagnetic wave transmitted through the first dielectric substrate 20 and the second dielectric substrate 40 is shifted to a lower frequency band. 4 and Fig. 5)

While the present invention has been described with reference to exemplary embodiments, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, And all changes to the scope that are deemed to be valid.

10: first meta atom D1: inner diameter
D2: outer diameter 20: first dielectric substrate
30: second meta-atom 40: second dielectric substrate
50: Distance changing means 51: Actuator
52: operating rod 60: guide rail
61: scale 70: rotating means
71: rotating frame 72: hinge
RE: receiver TR: transmitter
L: separation distance

Claims (10)

A first dielectric substrate on which first meta-atoms are periodically arranged and whose frequency is primarily transmitted;
A second dielectric substrate on which second meta-atoms are periodically arranged and spaced apart from the first dielectric substrate, the frequency being transmitted through the first dielectric substrate being secondarily transmitted; And
A variable distance means for connecting a first dielectric substrate or a second dielectric substrate to the first dielectric substrate or the second dielectric substrate through a front / back operation rod and varying a distance formed between the first and second dielectric substrates; ≪ / RTI >
Wherein the first dielectric substrate and the second dielectric substrate converge electromagnetic waves having a specific frequency band spreading and mutually spaced distances varying through the distance varying means to control the transmittance of the electromagnetic waves to be focused and transmitted,
Wherein the spacing distance varying means comprises an actuator connected to either one of the first dielectric substrate or the second dielectric substrate to move them; Lt; / RTI >
The actuator
The first dielectric substrate and the second dielectric substrate, which are interconnected through the guide rails, are moved along the guide rails while the operation rod is being moved forward and backward, And the distance between the electrodes is adjusted. The method according to claim 1,
The first and second meta-atoms are
Wherein the inner diameter is in the range of 2 mm to 5 mm, and the outer diameter of the ring is in the range of 6 mm to 9 mm. The method according to claim 1,
The first and second meta-atoms are
Wherein the inner diameter is in the range of 11 mm to 14 mm and the outer diameter of the ring is in the range of 23 mm to 27 mm. The method according to claim 1,
The first meta atom
The first dielectric substrate and the second dielectric substrate are arranged to face each other on both surfaces of the first dielectric substrate,
The second meta atom
And are arranged to face each other on both surfaces of the second dielectric substrate. The method according to claim 1,
The first and second meta-atoms are
And is made of silver (Ag) or copper (Cu). The method according to claim 1,
The distance between the first dielectric substrate and the second dielectric substrate
And the transmittance of the electromagnetic wave having a frequency band of 4 GHz to 11 GHz is adjusted while being adjusted to a distance of 7 mm to 40 mm. The method according to claim 1,
The distance between the first dielectric substrate and the second dielectric substrate
Wherein the transmittance of the electromagnetic wave having the frequency band of 2.3 GHz to 3.5 GHz is adjusted while being adjusted to a distance of 30 mm to 90 mm. delete The method according to claim 1,
Rotating means for mechanically connecting the first dielectric substrate and the second dielectric substrate with the transmission unit side to rotate the first dielectric substrate and the second dielectric substrate together about the transmission unit; Further comprising an electromagnetic wave transmitting device. The method according to claim 1,
The separation distance and frequency band
And the frequency band of the electromagnetic wave transmitted through the first dielectric substrate and the second dielectric substrate is shifted to a lower frequency band as the spacing distance increases.

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