KR101431005B1 - 3-dimensional laminated dielectric resonator assembly - Google Patents

Abstract

The three-dimensional laminated dielectric resonator assembly includes a plurality of dielectric resonance units mutually bonded to each other and connected to an inlet and an outlet of a traveling path of a radio wave, the dielectric resonator assembly being filled with a dielectric material inward to transmit a radio wave, Each of the dielectric resonator units being electrically separated from the conductive coating layer to form a coupling window for transmitting the radio wave through the dielectric material, The signal is output to the other connection terminal through the plurality of dielectric resonance units, and the plurality of dielectric resonance units connected are stacked in the direction perpendicular to the propagation direction of the radio waves.

Description

3-dimensional laminated dielectric resonator assembly < RTI ID = 0.0 >

The present invention relates to a dielectric resonator, and more particularly, to a dielectric waveguide formed by laminating and assembling a plurality of dielectric resonators.

As the wireless mobile communication service becomes popular, the demand for the wireless relay device is increasing, and in particular, a demand for a small / light relay device is increasing rapidly. A dielectric resonator is an electronic device having dielectric resonance characteristics, and is widely used as a component of an RF (radio frequency) device such as a communication device, a base station, and a repeater. As the information and communication technology has developed dramatically, portable equipment utilizing various frequency bands is on the increase. With this trend, it is possible to operate in a compact size and a high power, and a demand for a filter having a high temperature stability of frequency is increasing.

Dielectric resonators or dielectric ceramic filters are widely used as components of RF devices because they are well suited to this demand. The dielectric resonator has a resonance characteristic at a high frequency as compared with a filter using a general LC circuit, has a high temperature stability of frequency, and is able to withstand high operating power. The following non-patent documents disclose classification of a dielectric resonator and resonance frequency, resonance mode, and utilization method in such a resonator.

Under such circumstances, a cavity filter of a metal having excellent frequency characteristics and power is currently used, but the flow of the market is going to demand a filter having a small size and a relatively small weight and a relatively low price.

 A dielectric resonator in microwave, Hong Seok, The Institute of Electrical Engineers 32, 3 ('83 .3) pp.22-27 ISSN 1975-8359 KCI list, KIEE, 1983.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a dielectric resonator for use in a TE mode of a waveguide that solves the problem that the size of the dielectric resonator increases in order to maintain the frequency characteristic, Even if a dielectric material having a high dielectric constant is used, it is difficult to realize a miniaturized dielectric waveguide.

According to an aspect of the present invention, there is provided a dielectric resonator assembly including: a dielectric resonator assembly including a plurality of dielectric resonator units each having a dielectric material filled therein to transmit a radio wave, a conductive coating layer formed on an outer side thereof, unit); And a connection terminal connected to an entrance and an exit of the movement path of the radio wave to transmit an input signal and an output signal, wherein each of the dielectric resonance units is electrically separated from the conductive coating layer to transmit a radio wave through the dielectric material A coupling window for coupling the input signal to the coupling terminal, and outputting a signal input from the coupling terminal to the other coupling terminal through the coupled plurality of dielectric resonance units, Direction and the vertical direction.

In the dielectric resonator assembly according to the embodiment, the number of the dielectric resonator units stacked is determined according to the resonance frequency characteristic of the radio wave.

In the dielectric resonator assembly according to the embodiment, the height of the dielectric resonator unit to be stacked is determined to be the smallest value regardless of the resonance frequency band of the radio wave. Further, the dielectric resonator unit operates in accordance with the TE ₁₀₁ mode.

In the dielectric resonator assembly according to an embodiment, the dielectric resonator unit is formed in the form of a rectangular waveguide.

In the dielectric resonator assembly according to an embodiment, the connection terminal is formed by a hole in the vertical direction of the coupling of the dielectric resonator unit at the entrance and the exit of the movement path, thereby forming an N-type or SMA Type connector of the present invention.

In the dielectric resonator assembly according to one embodiment, the connection terminal may form a SMD type connector by inserting a strip line in the input / output coupling portion.

In the dielectric resonator assembly according to an embodiment, the mutually bonded plurality of dielectric resonator units are formed by bonding electrodes formed on one surface of the dielectric resonator unit and a conductive coating layer of another dielectric resonator unit.

Embodiments of the present invention can realize the size of the dielectric resonator to be relatively small while maintaining the superiority of the frequency characteristics and the power by using the TE mode of the waveguide by stacking the plurality of dielectric resonator units in the vertical direction, It is possible to fabricate a dielectric waveguide which is inexpensive and small in size without requiring a separate dielectric material.

1 is a view illustrating an integrated dielectric waveguide used in the technical field of the present invention.
2 is a diagram illustrating an array type dielectric waveguide used in the technical field of the present invention.
3 is a view for explaining the correlation between the size of the dielectric waveguide and the resonant frequency band.
4 is a view for explaining a method of reducing an area of an array type dielectric waveguide and a problem caused by the method.
5 is a perspective view illustrating a dielectric resonator assembly according to an embodiment of the present invention.
FIG. 6 is a diagram illustrating a prototype of a dielectric waveguide using the dielectric resonator assembly of FIG. 5 according to an embodiment of the present invention.
7 is an experimental example of a frequency characteristic graph measured using the dielectric waveguide of FIG.

Prior to describing the embodiments of the present invention, after studying characteristics and problems of waveguides utilized in the field of the prior art dielectric resonator technology, technical solutions adopted by the embodiments of the present invention in order to solve such problems are outlined .

1 is a view illustrating an integrated dielectric waveguide used in the technical field of the present invention. As shown in FIG. 1, the conventional integrated dielectric waveguide is produced by determining the size of the resonator in advance according to the frequency characteristics required by the environment in which the waveguide is utilized. In particular, currently used wireless communication systems provide various services using various frequencies, which require various filter characteristics. In order to cope with these various filter characteristics, the resonator constituting the filter must be able to be changed into various forms according to the conditions. That is, the integrated dielectric waveguide does not consider various changes in frequency characteristics, and in order to overcome this limitation, a dielectric resonator assembly as shown in FIG. 2 has been proposed.

FIG. 2 is a diagram illustrating an array type dielectric waveguide used in the technical field of the present invention, which shows the frame structure of (a) and the appearance of (b), respectively.

As described above, a technique has been proposed for dividing a resonator, which has been integrally implemented in order to cope with various filter characteristics, into a plurality of resonator units and joining the resonator in a suitable form according to the utilized environment. As shown in FIG. 2, the resonator unit 210 is formed by joining a plurality of resonator units 210 (in FIG. 2, four resonator units are joined in the direction d, which is the direction of propagation of radio waves) Can be achieved.

The wireless communication system has various services using various frequencies. The use of various frequencies means that only the desired frequency is selected selectively while minimizing mutual interference. For this purpose, a filter is used for unidirectional communication, and a duplexer (DPX) is used for bidirectional communication. That is, filters and duplexers are required to have characteristics according to various specifications. In the case of a dielectric waveguide, the shape or size of the waveguide is determined depending on the frequency, and is relatively larger than a TEM mode such as a monoblock using the integrated dielectric resonator shown in FIG. 1 or an array type resonator filter shown in FIG. It will have a large shape. In order to compensate for this, it is possible to use a dielectric material having a high dielectric constant, but it is difficult to utilize the dielectric material in a low frequency band (for example, a frequency band of 1 GHz or less).

In the wireless communication market, the spectrum of the corresponding frequency is continuously widening, such as the 4G long term evolution (LTE) or the broadcasting frequency band, and the competition is very intense in the 450MHz to 900MHz band, which is known as the highly marketable golden frequency band. Currently, metal cavity filters with excellent frequency characteristics and power are used, but the market trend is moving towards requiring filters that are small in size and weight and relatively inexpensive. Considering this market situation, it is required to develop a dielectric waveguide which is miniaturized by using a dielectric while maintaining excellent frequency characteristics and power using a TE mode of a waveguide even in a low frequency band.

Therefore, the embodiments of the present invention, which will be described below, pay attention to the correlation between the frequency characteristic and the size of the dielectric resonator in the TE mode, and propose a technical means for reducing the size of the dielectric waveguide.

FIG. 3 is a view for explaining a correlation between the size of a dielectric waveguide and a resonant frequency band. In order to overcome dielectric loss of a coaxial line, a waveguide utilizes an insulator as air or the like and removes a center conductor Transmission line.

The change in frequency (waveguide wavelength) according to the size of the TE mode waveguide filled with the dielectric material is given by Equation 1 below.

,

이고, λ₀은 자유 공간에서의 파장이고, λ_c는 도파관의 차단 주파수에 해당하는 파장이며, c는 빛의 속도를 나타내고,

는 유전 물질의 유전율을 나타낸다.here,

,

Λ ₀ is the wavelength in free space, λ _c is the wavelength corresponding to the cutoff frequency of the waveguide, c is the speed of light,

Represents the dielectric constant of the dielectric material.

f _c is a cut-off frequency and is one of the characteristics of the TE mode waveguide type resonator. Due to the characteristics of the waveguide, the waveguide can not be transmitted when the waveguide is not higher than a specific frequency, and the frequency corresponding to the wavelength at which the waveguide only reflects in place without proceeding is referred to as a cutoff frequency. In general, a mode having the lowest cutoff frequency is basically used, and in the embodiments of the present invention shown below, a filter designed by using the TE ₁₀₁ mode as a fundamental waveguide resonator is illustrated.

The size of the dielectric waveguide according to the resonant frequency band is determined from the following equation (2).

Here, m, n and l are subscripts of a waveguide mode in which the electric field distribution along the width, length and waveguide length of the waveguide section is determined according to several times the half period, and a, b, Length and waveguide length.

Since the embodiments of the present invention use the TE ₁₀₁ mode, the TE _mnl mode, that is, m = 1, n = 0, and l = 1 can be understood. In other words, in the TE ₁₀₁ mode, the vertical component of the waveguide section, that is, the height of the dielectric resonator unit, does not affect the determination of the cut-off frequency. Therefore, in the dielectric resonator shown in Fig. 3, it can be seen that the magnitude of b is not greatly affected by the frequency.

4 is a view for explaining a method of reducing an area of an array type dielectric waveguide and a problem caused by the method.

As described briefly in FIG. 2, a waveguide filter using an array type dielectric resonator generally has two or more junctions according to a desired frequency characteristic, thereby designing the filter. If a waveguide filter is designed for use in a low frequency band and the size and weight of the waveguide filter are designed to be reduced according to the fabrication method of a conventional array type dielectric resonator, Since the resonator is bonded in the lengthening direction (which means the z-axis direction in FIG. 3), the size of the resonator according to the area is not reduced even if the weight is reduced, which is not very helpful for the communication system using the RF filter.

Further, in order to reduce the area of the waveguide filter used in the communication system, even if the waveguide filter utilizing the array type dielectric resonator connected with the dielectric resonator unit 410 as shown in Fig. 4 is set up in the vertical direction This can be a problem because the height is too high. Further, in the case of FIG. 4, if the height d is forcibly decreased, the frequency increases according to Equation (2), so that the dielectric waveguide can not be used in the low frequency band.

2, the dielectric waveguide is designed by joining four resonator units, and a filter is manufactured by joining resonators along the z-axis. However, when the waveguide filter designing method of FIG. 2 is used under the situation where a low frequency is required, the size and weight of the dielectric waveguide are excessively increased. Therefore, the following embodiments of the present invention propose a novel dielectric resonator assembly for reducing the size of the axis (meaning b value in the y-axis in FIG. 3) without significantly influencing the frequency to laminate the dielectric resonator units do.

FIG. 5 is a perspective view illustrating a dielectric resonator assembly according to an embodiment of the present invention, and suggests a three-dimensional laminated dielectric waveguide that can be utilized even in a low frequency band.

5, the dielectric resonator assembly 510 is composed of a plurality of dielectric resonator units stacked and bonded together along the b axis. Such a dielectric resonance unit is filled with a dielectric material inward to transmit a radio wave, and a conductive coating layer is formed on the outside. In addition, the dielectric resonator assembly 510 includes a connection terminal 520 connected to the entrance and the exit of the movement path of the radio wave to transmit an input signal and an output signal. Since the dielectric resonator unit itself can be implemented in various forms by those skilled in the art, a detailed description thereof will be omitted here.

Each of the dielectric resonator units is electrically separated from the conductive coating layer to form a coupling window for transmitting a radio wave through the dielectric material so that a signal input from the connection terminal 520 is coupled to the plurality of dielectric resonator units To the other connection terminal. It is also preferred that the dielectric resonator assembly 510 of FIG. 5 implement coupling in a pattern on one side of the dielectric resonator unit using inductive. At this time, it is preferable that the plurality of dielectric resonator units joined are stacked in the direction perpendicular to the propagation direction of the radio wave, that is, along the b axis.

The number of the dielectric resonator units stacked in this manner can be determined according to the resonance frequency characteristic of the radio wave, and the specific numerical values thereof are as shown in Equation (2). Of course, it is preferable that the dielectric resonator unit proposed by embodiments of the present invention is formed in the form of a rectangular waveguide by the nature of the implementation. However, to the extent that the basic idea of the present invention is maintained, But may be implemented in other forms of the polyhedron.

In particular, since the dielectric resonator unit according to embodiments of the present invention operates in accordance with the TE ₁₀₁ mode, the height of the dielectric resonator unit stacked can be determined to be the smallest value regardless of the resonance frequency band of the radio wave. In this case, the smallest value means a minimum value at a universal level that can be physically fabricated in consideration of cost and process in realizing the dielectric resonance unit. When the dielectric waveguide designed in this way is utilized, the resonance frequency band of the radio wave can still operate at 1 GHz or less. Of course, it is also possible to design a dielectric waveguide which can be used in a high frequency band of 1 GHz or more by adjusting the number of dielectric resonator units stacked. Therefore, the above-described dielectric resonator assembly 510 has a feature that its thickness (height) can be relatively thinned due to easiness of fabrication, so that it can be applied to a dielectric constant of 90 or less and an implementation environment of 1 GHz or less.

6 illustrates a prototype of a dielectric waveguide using the dielectric resonator assembly of FIG. 5 according to an embodiment of the present invention. A total of eight dielectric resonator units 610, 620, 630, 640, 650, 660, 670, and 680 are vertically joined to each other to form a dielectric resonator assembly. At this time, even if the height of each of the dielectric resonator units is designed and manufactured to the minimum, there is no problem in maintaining the frequency characteristics in the low frequency band as described above. The plurality of mutually bonded dielectric resonator units are formed by bonding the electrodes formed on one surface of the dielectric resonator units 610, 620, 630, 640, 650, 660, 670, and 680 to the conductive coating layers of the other dielectric resonator units . Furthermore, a connector 690, which is commonly used as an input / output port, is connected to realize a universal application.

It is possible to minimize the size of the dielectric waveguide band-pass filter (BPF), the duplexer (DPX), or the multiplexer by utilizing the dielectric resonator assembly according to the embodiments of the present invention. The structure of the three-dimensional laminated dielectric waveguide is to form a filter or a duplexer by forming a coupling in a resonator. Various specifications are shown depending on the length of the resonator and the size of the coupling. Embodiments of the present invention can produce various products by stacking the number of poles of the resonator determined in the initial design according to the frequency characteristics by stacking the respective dielectric resonator units in the vertical direction to minimize the volume. In addition, since the size of the coupling can be variously formed by forming electrodes (for example, by printing a pattern) at the junction of the conductors on one surface of the vertical laminate resonator, Thus, dielectric waveguides of various specifications can be manufactured accordingly. At this time, the connection between the dielectric resonator units can be completed by silver and non-soldering.

The input and output connection terminals of the dielectric waveguide bandpass filter, the duplexer, the multiplexer, and the resonator sensor thus formed are formed by drilling holes in the vertical direction of the coupling of the dielectric resonator unit at the entrance and exit of the movement path of the radio wave And may form a connector of either N-type or SMA type. Alternatively, the input / output connection terminal may be directly attached to the main board by attaching a strip line to the input / output coupling portion to form an SMD type connector. The coupling between the input and output connection terminals or the pole and the pole can be completed by forming a pattern printed electrode on one side of the laminated resonator facing each other and then joining two blocks with silver and non- have.

7 is an experimental example of a frequency characteristic graph measured using the dielectric waveguide of FIG. The x-axis of the graph shown in Fig. 7 represents the frequency (MHz), and the y-axis represents the size (dB) of the signal. The signal is weakened as '-' increases with '0'. The graph shown in FIG. 7 shows a bandpass filter (BPF) having a bandwidth of 25 MHz at a center frequency of 844 MHz and passing signals received from the antenna end from 831.5 MHz to 856.5 MHz and blocking the remaining frequency bands. The graph of the frequency characteristic shown in Fig. 7 confirms that the dielectric filter has a very excellent characteristic of skirt of frequency using ripple of less than 1.0dB at an insertion loss of about 1.5dB and using eight stages .

According to the above-described embodiments of the present invention, the dielectric resonator is dimensionally reduced in size while maintaining the superiority of frequency characteristics and power by using the TE mode of the waveguide by three-dimensionally stacking the plurality of dielectric resonator units in the vertical direction Can be implemented, and inexpensive and miniaturized dielectric waveguides can be fabricated without the need for a separate dielectric material replacement, especially at low frequencies (e.g., 1 GHz binary).

The present invention has been described above with reference to various embodiments. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. Therefore, the disclosed embodiments should be considered in an illustrative rather than a restrictive sense. The scope of the present invention is defined by the appended claims rather than by the foregoing description, and all differences within the scope of equivalents thereof should be construed as being included in the present invention.

210, 410, 610, 620, 630, 640, 650, 660, 670, 680: dielectric resonator unit
510: stacked dielectric resonator assembly
520, 690: connection terminal

Claims (9)

A plurality of dielectric resonator units mutually bonded to each other to form a conductive coating layer on an outer side thereof; And
And a connection terminal connected to an entrance and an exit of the movement path of the radio wave to transmit an input signal and an output signal,
Each of the dielectric resonator units is electrically separated from the conductive coating layer to form a coupling window for transmitting a radio wave through the dielectric material so that a signal input from the connection terminal is connected to the plurality of dielectric resonator units To other connection terminals,
Wherein the plurality of dielectric resonator units are laminated in a direction perpendicular to the propagation direction of the radio waves. The method according to claim 1,
Wherein the number of the dielectric resonator units stacked is determined in consideration of the resonance frequency characteristic of the radio wave that determines the size of the dielectric waveguide. The method according to claim 1,
Wherein the height of the dielectric resonator unit which is stacked is a value independent of the resonance frequency band of the electric wave and does not affect the determination of the cutoff frequency corresponding to the wavelength at which the reflection only occurs in place without progressing the wave, Assembly. The method according to claim 1,
Wherein the dielectric resonator unit is formed in the form of a rectangular waveguide. The method according to claim 1,
Wherein the resonant frequency band of the radio wave is 1 GHz or less. The method according to claim 1,
Wherein the dielectric resonator unit operates according to a TE ₁₀₁ mode. The method according to claim 1,
The connection terminal includes:
And a hole is drilled in a vertical direction of the coupling of the dielectric resonator unit at an entrance and an exit of the movement path to form a connector of either N-type or SMA type. Dielectric resonator assembly. The method according to claim 1,
The connection terminal includes:
And a strip line is inserted into the input / output coupling portion to form an SMD type connector. The method according to claim 1,
Wherein the plurality of mutually bonded dielectric resonator units comprise:
And the electrode is formed by bonding an electrode formed on one surface of the dielectric resonator unit to a conductive coating layer of another dielectric resonator unit.

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