KR100390351B1 - A filter and duplexer filter composed cavity including dielectric resonator - Google Patents

Abstract

Disclosed are a filter and a duplexer filter composed of a conductor cavity incorporating a dielectric resonator capable of various small designs and improving the spurious frequency characteristics of the filter. The filter made of a conductor cavity incorporating a dielectric resonator of the present invention forms an input terminal and an output terminal for performing input and output of a signal, and includes a predetermined interval on one or both surfaces of the conductor cavity coupled to each other including the input and output terminals. A metal case provided with at least two and formed integrally; A dielectric resonator spaced from the conductor cavity at predetermined intervals for each of the conductor cavities and interpolated and fixed; And a cover formed in each of the dielectric resonators so as to adjust the resonant frequency, respectively, in which the tuning screws are located in the dielectric resonator region and coupled to the metal case. In addition, a duplexer filter comprising a conductor cavity incorporating a dielectric resonator of the present invention forms a transmitting end, a receiving end, and an antenna end for inputting and outputting signals, and a transmitting side elliptic function band pass between the transmitting end and the antenna end. In order to form a filter, at least two transmitting side cavity cavities, which are coupled to each other including the transmitting end and the antenna end, are provided on one side or both sides, and a receiving side elliptic function band pass filter is provided between the receiving end and the antenna end. A metal case having at least two receiving side conductor cavities coupled to each other so as to be configurable on one or both sides thereof so as to integrally form the transmitting and receiving conductor cavities; Dielectric resonators spaced at predetermined intervals in each of the cavities and interpolated and fixed; And a cover formed in each of the dielectric resonators so as to adjust the resonant frequency, respectively, in which the tuning screws are located in the dielectric resonator region and coupled to the metal case. According to the present invention, the spurious frequency characteristics can be improved by designing differently than at least one conductor cavity and the dielectric resonator constituting the filter compared with the remaining conductor cavity and the dielectric resonator embedded therein. In addition, since the conductor cavities are side-by-side or stacked, it is possible to selectively utilize the X-axis, Y-axis and Z-axis coupling to manufacture various different types of compact filters and duplexer filters. In particular, since the Z-shaft coupling can be used to manufacture a vertical filter, it may meet the vertical filter demand.

Description

A filter and duplexer filter composed cavity including dielectric resonator}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dielectric resonator filter and a duplexer filter. In particular, the present invention relates to a filter and a duplexer filter including a conductor cavity incorporating a dielectric resonator capable of various small designs and improving spurious frequency characteristics of the filter. It is about.

In the field of current microwave communication technology, dielectric resonators have been widely used to reduce the size and weight of components. In particular, two or more resonators are properly combined to make a filter, and resonators made of a hollow metal conductor having a cylindrical shape or a hexahedron shape, that is, a filter made by combining an air cavity are used in a base station or a repeater of a wireless communication network. In recent years, in order to improve the temperature characteristics of the filter, lower the insertion loss, and reduce the size, a resonator designed by placing a dielectric resonator selected for these characteristics in the conductor cavity, that is, a conductor cavity containing a dielectric resonator is combined. It is widely used in communication networks. In other words, a conductor cavity having a dielectric resonator is used in a small size and is used for a band pass filter or a duplexer filter for high power. Here, the configuration of the conventional dielectric resonator filter will be described.

FIG. 15 shows a plan view of a conventional three-pole dielectric resonator plan, showing a configuration in the case of using TE _01δ mode (where TE is electromagnetic wave of electric field component as Transverse Electric Weves). Referring to FIG. 15, reference numeral 10 denotes a conductor cavity which is a rectangular metal box having a constant size, reference numeral 12 denotes a frequency input terminal for inputting high frequency from the outside, and reference numeral 14 outputs a filtered frequency inside. An output terminal for the input terminal 12 and the output terminal 14 is attached to one side of the conductor cavity 10. In addition, three dielectric resonators 16, 18, and 20 having a predetermined dielectric constant are disposed at predetermined intervals within the conductor cavity 10. Each of the input terminal 12 and the output terminal 14 attached to the outside of the conductor cavity 10 may include a coupling probe (or a coupling loop) extending into the inside of the conductor cavity 10. also referred to as a coupling loop], i.e., an input coupling probe 22 and an output coupling probe 24.

FIG. 16 is a sectional view taken along the line A-A 'of the dielectric resonator shown in FIG. 15 and shows a cross-sectional view in which a cover (Cover) on which tuning screws for resonant frequency adjustment are formed is coupled to the conductor cavity (10). Referring to FIG. 16, each of the three dielectric resonators 16, 18, and 20 spaced apart in the conductor cavity 10 is supported by the supports 26 at a predetermined height from the bottom surface of the conductor cavity 10. Each of the dielectric resonators 16, 18, and 20 is supported by the support 26 by a fixed screw 28 having a low dielectric constant and fixed to the conductor cavity 10. At this time, the material of the support 26 is a low frequency loss and low dielectric constant Teflon or polycarbonate, etc., these are the magnetic field energy distribution of the dielectric resonator (16, 18, 20) made of a ceramic material It performs the function.

The cover 11 which is warmed on the upper portion of the conductor cavity 10 is coupled to the tuning screw 30 for adjusting the resonance frequency on the upper portion of the dielectric resonators 16, 18, 20, the lower portion of these screws 30 In the conductor cavity 10 inside the tuning plate (Tuning plate, 32) is formed, which is located on top of the dielectric resonator (16, 18, 20). The diameter of the tuning plate 30 should be appropriately selected according to the accuracy of the adjustment of the resonance frequency.

In the characteristics of the filter configured as described above, there are a number of ways to implement the filter using the dielectric resonators 16, 18, 20, the most common method of using the TEM mode, There is a method using the TE _01δ mode. In addition, the filtering performance of the dielectric resonator filter has a large difference depending on the number of dielectric resonators located in the conductor cavity 10.

Hereinafter, the operation of the conventional dielectric resonator filter having the above configuration will be described.

When a high frequency having an arbitrary frequency is input to the input terminal 12, the energy of the high frequency is transferred to the inside of the conductor cavity 10 through the input side coupling probe 22 coupled to the input terminal 12. In this case, an electric field E is formed in the direction 35 of the input side coupling probe 22, and a magnetic field H is formed around the input side coupling probe 22. The magnetic field H formed from the input side coupling probe 22 connected to the input terminal 12 is coupled (excited) to the dielectric resonator 16 that is most closely spaced apart. At this time, the dielectric resonator 16 couples the high frequency frequency having an arbitrary resonance frequency f _o to the spaced dielectric resonator 18 by the coupling of the magnetic field H transmitted from the input side coupling probe 22. . Accordingly, when the magnetic field H is coupled from the dielectric resonator 16, the electric field E is induced in the circumferential direction of the spaced dielectric resonator 18, which induces the magnetic field H in the circumferential direction from the center. . At this time, the magnetic field (H) formed in the dielectric resonator 18 is coupled to another dielectric resonator 20 in close proximity and spaced apart, the magnetic field (H) formed in the dielectric resonator 20 is the output terminal 14 It is output to the outside via the output-side coupling probe 24 connected to.

On the other hand, in the above operation, by adjusting the tuning screw 30 located above each dielectric resonator (16, 18, 20), the upper surface of the dielectric resonator (16, 18, 20) and the tuning screw ( The distance between 30) is changed. Due to the distance change, the Q value of the dielectric resonator couples the high frequency having the initially set resonance frequency f _o to the spaced dielectric resonator 18. Then, the output of the frequency changed by the tuning screw 30 by the continuous coupling as described above.

At this time, if the resonance Q value of each of the three dielectric resonators 16, 18, and 20 is changed, the resonance frequencies f _o of the three dielectric resonators 16, 18, and 20 are different from each other. Therefore, by adjusting the three tuning screws 30 formed in the dielectric resonators 16, 18, and 20, only the frequencies of the desired band can be passed among the high frequency signals input to the input terminal 12.

At this time, the interval between the input side coupling probe 22 and the dielectric resonator 16, the output side coupling probe 24 and the dielectric resonator 20 and the dielectric resonators 16, 18, 20 of the above configuration The interval of s depends on the coupling density of the magnetic field (H) and is a factor influencing the performance and characteristics of the filter. Therefore, the spacing of the components should be designed in consideration of the performance and characteristics of the filter.

However, the conventional dielectric resonator filter using the mode configured as shown in FIGS. 15 and 16 has a problem of deteriorating the performance of the filter by passing a signal of unnecessary frequency components as it is by using a cylindrical dielectric resonator. . In other words, the TE _01δ mode does not operate only in a disk (cylindrical) type dielectric resonator, but a myriad of modes such as TM ₀₁₀ , TM _01δ , and TM _{011 + δ} modes operate. The TM ₀₁₀ , TM _01δ , TM _{011 + δ} modes are causing unwanted unwanted frequencies to pass in the cylindrical resonators 16, 18, 20. Here, the unnecessary frequency refers to modes other than the main operation mode, and refers to a spurious mode. For example, the signal of the desired band is filtered out for the TM _01δ mode signal, but the filtering performance is greatly reduced by passing the frequency beyond the desired band for the frequency signals of the TM ₀₁₀ and TM _{011 + δ} modes. Occurred.

On the other hand, in order to solve the above problems, the dielectric resonators constituting the filter is separated by forming a diaphragm, respectively, and by adjusting the diaphragm to adjust the amount of field energy to improve the spurious frequency characteristics. However, it is possible to improve spurious frequency characteristics by using such a diaphragm, but the coupling between conductor cavities having a dielectric resonator is coupled sideways, that is, by coupling the conductor cavities using only side coupling. Only a filter with a resonator built-in conductor cavity could be manufactured, and if additional filters were added to improve the frequency characteristics of the filter, it would be inconvenient to provide a coupling waveguide separately. There was a problem. Accordingly, there is a problem that the volume or weight of the filter also increases.

Accordingly, an object of the present invention is to provide a filter and a duplexer filter composed of a conductor cavity having a dielectric resonator capable of various small designs and improving the spurious frequency characteristics of the filter.

Specifically, for the different types of compact designs, the coupling between the conductor cavities constituting the filter may be combined with the side, that is, the X-axis and Y-axis coupling using an IRIS or a coupling probe. By applying all radial, that is, Z-axis coupling (radial coupling) to form a compact (side-by-side or stacked filter) to be designed (compact).

In addition, at least one of the cavities in which the dielectric resonator constituting the filter is embedded, and the size of the dielectric resonator embedded in the conductor cavity, constitute the remaining filter. In order to improve the spurious frequency characteristics by designing differently from the size of the conductor cavity (cavity) and the size of the dielectric resonator embedded in the remaining conductor cavity (cavity).

FIG. 1A is a schematic diagram of a generally used cylindrical resonator of a cylindrical shape;

1B and 1C are schematic diagrams showing electric and magnetic field distributions of the lowest TE _01δ mode that may appear in the dielectric resonator of FIG. 1A, respectively;

2A is a schematic diagram showing a conductor cavity incorporating a dielectric resonator and equipped with a tuning screw;

2b is a schematic diagram of a metal block conductor cavity of a cylindrical shape;

3A and 3B are a plan view and a side view showing the electric and magnetic field distributions of the TE _01δ mode, which is the lowest resonance mode of the cylindrical conductor cavity in which a cylindrical dielectric resonator is incorporated;

4 is a conceptual diagram illustrating three methods of joining two conductor cavities incorporating a dielectric resonator using apertures (IRIS);

FIG. 5 is a conceptual diagram schematically showing four cases in which two conductor cavities having a dielectric resonator are coupled through a coupling probe, generally a conducting wire; FIG.

FIG. 6A illustrates an elliptic function filter including a conductor cavity incorporating a dielectric resonator as a first embodiment of the present invention.

Figure 6b is a view showing a cover mounted with a tuning screw that is covered on the upper conductor cavity of Figure 6a,

6C is a view showing a coupling relationship between the conductor cavities of FIG. 6A;

FIG. 7A is a perspective view illustrating a duplexer filter in which two diliptic function band pass filters shown in FIG. 6 are combined as a second embodiment of the present invention; FIG.

Figure 7b is a schematic view showing a cover with a tuning screw that is covered on the upper conductor cavity shown in Figure 7a,

7C is a view showing a coupling relationship between the conductor cavities of FIG. 7A;

FIG. 8A is an elliptic function filter composed of a conductor cavity incorporating a dielectric resonator in which both X and Z-axis couplings (side and radial coupling) of FIGS. 4 and 5 are applied. function filter),

FIG. 8B is a schematic front sectional view taken along line B-B 'of the elliptic function filter shown in FIG. 8A and illustrates a coupling relationship between the conductor cavities including the input and output terminals;

FIG. 9A is a fourth embodiment of the present invention, and is a perspective view of a duplexer filter manufactured by stacking an elliptic function type band pass filter shown in FIG. 6;

FIG. 9B is a front sectional view taken along a line C-C 'of one side of a duplexer filter coupled to an antenna connector, illustrating a coupling relationship between an antenna end and conductor cavities; FIG. drawing,

FIG. 9C is a front sectional view taken along the line D-D 'of another duplexer filter of a duplexer filter coupled to a transmitting end connector and a receiving end connector, and a coupling relationship between the transmitting cavities including the transmitting end and the receiving end; Drawing,

FIG. 10 is a perspective view of a duplexer filter manufactured by combining the elliptic function type band pass filter shown in FIG. 8 laterally as a fifth embodiment of the present invention;

11 to 14 are frequency characteristics showing the results of experiments combining a dielectric resonator having a different size and a conductor cavity, respectively.

Explanation of symbols on the main parts of the drawings

DR: Dielectric Resonator C, C ': Conductor Cavity

SP: Support TS: Tuning Screw

CW: Conducting Wire IC: Input Connector

OC: output connector TxC: transmitter connector

RxC: Receiver Connector AC: Antenna Connector

A filter made of a conductor cavity incorporating a dielectric resonator for achieving the object of the present invention, forms an input stage and an output stage for performing the input and output of the signal, and includes a surface of the conductor cavity coupled to each other including the input stage and the output stage Or a metal case having at least two or more predetermined intervals formed on both surfaces thereof and integrally formed; An input dielectric resonator and an output dielectric resonator coupled with the input terminal and the output terminal, and at least one intermediate dielectric resonator coupled between the input dielectric resonator and the output dielectric resonator, and comprising a conductor cavity for each of the conductor cavities. A dielectric resonator spaced apart at predetermined intervals from the dielectric resonator; And a cover formed in each of the dielectric resonators so as to adjust the resonance frequency for each of the dielectric resonators, and having a tuning screw positioned in the dielectric resonator region and fastened to the metal case.

At this time, each of the input terminal and output terminal, the connector is connected to an external element; A coupling probe connected to the input terminal to couple a high frequency signal from an external device into the conductor cavity, or a coupling probe connected to the output terminal to couple a signal filtered in the conductor cavity to the external device.

In addition, for coupling between the conductor cavities, an iris (IRIS) is formed on the partition wall between the conductor cavities, or a conducting wire connecting the conductor cavities is provided.

The size of the conductor cavity and the size of the dielectric resonator embedded in the conductor cavity are different from the size of the remaining conductor cavity constituting the filter and the size of the dielectric resonator embedded in the other remaining conductor cavity. In this case, the first resonant frequency of the conductor cavity of different size and the dielectric resonator embedded in the conductor cavity is the first of the other resonant cavity satisfying the pre-calculated filter characteristics and the first of the dielectric resonator embedded in the other conductor cavity. The design should be similar to the first resonant frequency.

On the other hand, for side coupling including the X-axis and Y-axis between the conductor cavities, the input and output terminals are arranged sideways, and the conductor cavities coupled with the input and output terminals are arranged in a row or column direction. Configure the filter. Alternatively, the input and output terminals are disposed up and down for side coupling and Z-axis coupling between the conductor cavities, and the conductor cavities coupled with the input and output terminals are arranged in a row or column direction. Configure the filter by listing.

Here, the coupling between the conductor cavities which perform the function of input and output in the conductor cavities of the continuously arranged and coupled band pass filter is negatively coupled.

On the other hand, the duplexer filter composed of a conductor cavity incorporating a dielectric resonator of the present invention, forming a transmitting end, a receiving end and an antenna end for performing signal input and output, and configures a transmission band pass filter between the transmitting end and the antenna end. At least two transmitting side conductor cavities coupled to each other, including the transmitting end and the antenna end, are provided on one or both surfaces thereof, and the receiving side bandpass filter can be configured between the receiving end and the antenna end. A metal case in which at least two receiving side cavity cavities are provided on one or both sides of the ring to form the transmitting side cavity and the receiving side cavity as an integrated body; An input dielectric resonator and an output dielectric resonator coupled with input terminals and output terminals configured in each of the transmitting and receiving conductor cavities, and at least one intermediate dielectric resonator coupling between the input dielectric resonator and the output dielectric resonator. A dielectric resonator including an interpolation and spaced at predetermined intervals in each of the cavities; And a cover formed in each of the dielectric resonators so as to adjust the resonance frequency for each of the dielectric resonators, and having a tuning screw positioned in the dielectric resonator region and fastened to the metal case.

In this case, each of the transmitting end, the receiving end, and the antenna end may include a connector connected to an external element; A high frequency signal from an external element connected to the receiving end to couple into the conductor cavity or a signal filtered in the conductor cavity to an external element connected to the transmitting end or input from the transmitting end and the receiving end And a coupling probe for coupling a signal to an external device and coupling an input signal from an external device to a transmitter and a receiver.

In addition, for each of the transmitting bandpass filter and the receiving bandpass filter, an IRIS is formed in a partition wall between the conductor cavities for coupling between the conductor cavities, or a conductor for connecting the conductor cavities. Implement the conducting wire.

For each of the transmitting bandpass filter and the receiving bandpass filter, the size of the conductor cavity and the size of the dielectric resonator embedded in the conductor cavity are different from the other conductor cavity constituting the filter and the other conductor cavity. It is different from the size of the dielectric resonator built in. In this case, the first resonant frequency of the conductor cavity of different size and the dielectric resonator embedded in the conductor cavity is the first of the other resonant cavity satisfying the pre-calculated filter characteristics and the first of the dielectric resonator embedded in the other conductor cavity. The design should be similar to the first resonant frequency.

On the other hand, for the side-band coupling including the X-axis and the Y-axis between the conductor cavities for each of the transmitting side bandpass filter and the receiving side bandpass filter, the transmitting end and the antenna end, and the antenna end and the receiving end, The duplexer filter is configured by arranging the conductor cavities coupled to the transmitting end, the antenna end, the receiving end, and the antenna end in a row direction or a column direction, respectively. In addition, for each of the transmitting side band pass filter and the receiving side band pass filter, the transmitting end and the receiving end are disposed up and down for side coupling including an X axis and a Y axis between the conductor cavities, and the conductor The cavity is arranged next to each other at the transmitting end and the receiving end, and the duplexer filter may be configured by stacking the transmitting side bandpass filter and the receiving side bandpass filter which are coupled with the antenna end. At this time, the transmitter and the receiver are arranged up and down for side coupling including the X-axis and Y-axis between the conductor cavities, and the conductor cavity is arranged side by side at each of the transmitter and the receiver, so that the transmission band pass In the case where the filter and the receiving side band pass filter are formed by stacking, the antenna end and the side coupling are made to each of the transmitting side band pass filter and the receiving side band pass filter. In addition, in order to apply both side coupling and Z-axis radial coupling including the X and Y axes between the conductor cavities, to the transmitting bandpass filter and the receiving bandpass filter, respectively. A duplexer filter may be configured by arranging a transmitting end and a receiving end side by side, and the conductor cavity is stacked up and down at each of the transmitting end and the receiving end, and the transmitting side bandpass filter and the receiving side bandpass filter which are coupled with the antenna end are arranged side by side. It may be.

Here, for each of the transmitting bandpass filter and the receiving bandpass filter, the coupling between the conductor cavities that perform the functions of input and output in the conductor cavities of the continuously arranged and coupled bandpass filters is negatively coupled. do.

As described above, in the metal cavity filter incorporating the dielectric resonator, the metal cavity elliptic function filter incorporating the dielectric resonator with improved spurious frequency characteristics in various forms is different. (dielectric resonator loaded metal cavity elliptic function filter) will be described.

In the filter and duplexer filter of the present invention, two or more conductor cavities incorporating a dielectric resonator are combined. In the present invention, the size of the at least one conductor cavity among the cavities incorporating the dielectric resonator constituting this filter and the size of the dielectric resonator contained in the conductor cavity are different from the size of the conductor cavity constituting the remaining filter. It is different from the size of the dielectric resonator in the remaining conductor cavity. Alternatively, the size of either the conductor cavity or the dielectric resonator is designed differently from the conductor cavity or the dielectric resonator constituting the other resonators constituting the filter. At this time, although both the dielectric resonator and the conductor cavity size, and one of the dielectric resonator and the conductor cavity are different from the size of the other dielectric resonator and conductor cavity constituting the filter, the first resonant frequency of all of them is the pre-calculated frequency of the filter It is designed to suit the characteristics.

In addition, in the filter and the duplexer filter proposed in the present invention, higher order mode harmonics associated with dielectric resonators, conductor cavities, or shapes thereof exhibit different frequency characteristics. Therefore, filters combined with dielectric resonators and conductor cavities of different sizes have the effect of suppressing higher-order mode harmonics outside the predesigned filter frequency than similar types of filters conventionally used. Similar types of filters used in the prior art generally apply side coupling using the coupling between the cavities (IRIS) or coupling probe (coupling prove). In the present invention, the coupling between the cavities of the filter is a compact shape of the filter by applying both side coupling and Z-axis coupling including the X and Y axes using an iris or a coupling probe. Design to be compact.

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

First, in the description of the drawings of the present invention, the same reference numerals are assigned to components that perform the same function, and descriptions of parts in which the same concept is duplicated and repeated will be omitted.

FIG. 1A is a schematic diagram of a dielectric resonator having a generally cylindrical shape. As shown in FIG. 1A, the dielectric resonator DR has a cylindrical shape and has a size of an arbitrary height L and a diameter D. As the material of the dielectric resonator DR, a dielectric having a high selectivity and a relative dielectric constant of approximately 10 to 100 is mainly used. 1B and 1C are schematic diagrams showing electric and magnetic field distributions of the lowest TE _01δ mode that may appear in the dielectric resonator of FIG. 1A, respectively.

FIG. 2A is a schematic diagram showing a conductor cavity incorporating a dielectric resonator and equipped with a tuning screw, and FIG. 2B is a schematic diagram of a metal block conductor cavity having a cylindrical shape. Referring to FIGS. 2A and 2B, the frequency characteristics are changed by the sizes L and D of the dielectric resonator DR and the sizes S and 2R of the conductor cavity C, and the frequency characteristics are adjusted. The tuning screw (TS) is installed. On the other hand, the dielectric resonator (DR) and the conductor cavity (C) is located at a predetermined interval, for this purpose is maintained between the dielectric resonator (DR) and the conductor cavity (C) by using a support (SP; SP) Let's do it. The support SP is made of polymer, ceramic, polymer / glass fiber or polymer / ceramic composites. Here, 2R> D and S> L are satisfied.

On the other hand, as shown in Figure 2b, to form a metal block (C ') formed a resonance hole having a height (S) and a diameter (2R) and has a predetermined size (L, D) of FIG. The dielectric resonator DR may be incorporated. In the present invention, a metal block in which a plurality of resonance holes are formed by applying the integrated metal block C ′ of FIG. 2B will be described.

3A and 3B are plan and side views showing distributions of electric and magnetic fields of TE _01δ mode, which is the lowest resonance mode of a cylindrical conductor cavity in which a cylindrical dielectric resonator is incorporated. As shown in Figs. 3A and 3B, the direction of the magnetic field H is perpendicular to the electric field E, and in the dielectric resonator DR, a fairly strong electric field in all the equator planes except for the region near the center. (E) is distributed. Therefore, a small cylindrical plug near the center of the dielectric resonator DR can be removed without significantly changing the distribution state and resonance frequency of the electric field E. FIG. Accordingly, it is possible to form a dielectric resonator similar to the doughnut shape.

FIG. 4 is a conceptual diagram illustrating three methods of joining two conductor cavities incorporating a dielectric resonator using apertures (IRIS). Specifically, FIG. 4A is a conceptual diagram in which two sidely arranged cavity cavities have positive X-axis or Y-axis coupling through IRIS, and FIG. 4B is a view of two stacked laminations of conductor cavities positively in iris. A conceptual diagram of Z-axis coupling (positive radial coupling), and FIG. 4C illustrates a conceptual diagram of a negative Z-axis coupling (negative radial coupling) through the iris of two stacked conductor cavities. Here, the X-axis and Y-axis coupling is defined as side coupling where coupling is performed with a conductor cavity proximate on a plane, and the Z axis is a radial coupling in which coupling with a conductor cavity proximate above and below formed by stacking is performed. Is defined as

FIG. 5 is a schematic diagram illustrating four cases in which two conductor cavities incorporating a dielectric resonator are coupled through a coupling probe, generally a conducting wire. Specifically, FIGS. 5A and 5B are side views of a conductor cavity incorporating a dielectric resonator, and FIG. 5A shows a positive X-axis or Y-axis coupling between two conductor cavities through a coupling probe. 5B is a conceptual diagram in which two conductor cavities have negative X-axis or Y-axis coupling through a coupling probe. 5c and 5d are stacked as side views of a conductor cavity incorporating a dielectric resonator, 5c is a conceptual diagram in which two conductor cavities are positive radially coupled through a coupling probe, and 5d is two Each of the conductor cavities shows a conceptual diagram of negative radial coupling through a coupling probe. As such, a method of coupling the laterally arranged or stacked conductor cavities through the conducting wire CW is provided.

FIG. 6A illustrates an elliptic function filter composed of a conductor cavity incorporating a dielectric resonator as a first embodiment of the present invention. FIG. 6C illustrates a coupling relationship between the conductor cavities of FIG. 6A. As shown in FIGS. 6A and 6C, the elliptic filter includes a six-pole filter (CR1, CR2, CR3, CR4, CR5, CR6), and has negative elliptic couplings. Except for k (2,5) and -k (1,6), the coupling between all cavities, including the combination of input connector (IC) and output connector (OC), is positive X- or Y-axis coupling. ) That is, k (1,2), k (2,3), k (4,5), and k (5,6) have X-axis coupling, and k (3,4) and -k (2 (5) and -k (1,6) are Y-axis coupling. In this case, the input terminal connector and the output terminal connector usually use an N type or an SMA type.

At this time, as a feature of the present invention, at least one of the six conductor cavities is different in size, or the size of the dielectric resonator is configured differently. Of course, at this time, even if the size of the conductor cavity and the dielectric resonator are changed, for example, the first resonance frequency resonating at 1.83 GHz is similar to the filter characteristic. This applies to all the embodiments described below. In addition, the coupling is performed in the order of CR1-> CR2-> CR3-> CR4-> CR5-> CR6. Since the coupling process is the same as in the related art, a detailed description thereof will be omitted.

FIG. 6B is a view showing a cover equipped with a tuning screw which is covered over the conductor cavity of FIG. 6A. As shown in Fig. 6B, tuning screws TS1, TS2, TS3, TS4, TS5, TS6 are mounted in each dielectric resonator region.

FIG. 6C illustrates a coupling relationship between the conductor cavities of FIG. 6A. As shown in Fig. 6C, -k (2,5) and -k (1,6) have negative side coupling, and all others have positive side coupling.

FIG. 7A is a perspective view illustrating a duplexer filter in which two elliptic function band pass filters shown in FIG. 6 are combined in the Y-axis direction as a second embodiment of the present invention. . FIG. 7B is a view schematically showing a cover on which a tuning screw that is covered over the conductor cavity shown in FIG. 7A is mounted. FIG. 7C is a diagram illustrating a coupling relationship between the conductor cavities of FIG. 7A.

As shown in FIGS. 7A to 7C, the elliptic function filter includes a transmitter 6-pole filter (CR1, CR2, CR3, CR4, CR5, CR6) and a receiver 6'-pole filter (CR1 ', CR2', CR3). ', CR4', CR5 ', CR6'). -K (2,5) with negative elliptic side couplings at the transmitter and -k (1,6) with negative elliptic side couplings at the transmitter, and -k (2) with negative elliptic side couplings at the transmitter. Except for ', 5') and -k (1 ', 6'), the coupling between all cavities, including the coupling of the transmit connector (TxC) and the receive connector (RxC) and antenna connector (AC), is positive side coupling ( positive side coupling). In addition, as a feature of the present invention, the size of at least one conductor cavity and the size of the dielectric resonator are changed at the transmitting side Tx, and the size of at least one conductor cavity and the size of the dielectric resonator is also changed at the receiving side Rx. I am changing the size.

FIG. 8A is an elliptic function filter composed of a conductor cavity incorporating a dielectric resonator in which both X and Z-axis couplings (side and radial coupling) of FIGS. 4 and 5 are applied. function filter), and FIG. 8B is a schematic sectional view taken along line B-B 'of the elliptic function filter shown in FIG. 8A and illustrates a coupling relationship between the conductor cavities including the input terminal and the output terminal. As shown in FIGS. 8A and 8B, the X-axis and Z-axis couplings of FIGS. 4 and 5 are applied to the coupling between the conductor cavities having a dielectric resonator in various forms. It can be seen that the design is designed to be more compact and easy to manufacture. Specifically, as shown in FIG. 8B, k (1,2), k (2,3), k (4,5), k (5,6), and an input connector IC and an output connector OC. ) Are all positive side coupling. However, in order to compactly design the filters in many different forms, i.e. by stacking the conductor cavities in a vertical form, the k (3,4) coupling is a positive radial coupling described in Figures 4 and 5. Applied. In addition, elliptic function coupling, -k (2,5) and -k (1,6), applied negative radial coupling. In addition, as shown in Figure 8b, because the conductor cavity is formed up and down, the cover with the tuning screws (TS1, TS2, TS3, TS4, TS5, TS6) is to be provided on the top and bottom, respectively.

FIG. 9A is a perspective view of a duplexer filter manufactured by stacking an elliptic function type band pass filter shown in FIG. 6 in the Z-axis direction as a fourth embodiment of the present invention. . As shown in FIG. 9A, each of the band pass filters constituting the transmitting end Tx and the receiving end Rx is stacked side by side and not stacked side by side as compared with FIG. 7. . This type of duplexer filter has a combination of the transmitter connector (TxC), the receiver connector (RxC), the coupling between the cavities, and the negative elliptic function couplings in FIGS. 4 and 5. It is made of the side coupling described.

FIG. 9B is a front sectional view taken along a line C-C 'of one side of a duplexer filter coupled to an antenna connector, illustrating a coupling relationship between an antenna end and conductor cavities; FIG. Drawing. As shown in FIG. 9B, since the transmitting side X-axis coupling (CR4, CR5, CR6, AC) and the receiving side X-axis coupling (CR1 ', CR2', CR3 ', AC) are made up and down, respectively, Z-axis coupling does not occur. However, the antenna connector is side-coupled simultaneously with CR6 of the transmitting end and CR1 'of the receiving end.

FIG. 9C is a front sectional view taken along the line D-D 'of another duplexer filter of a duplexer filter coupled to a transmitting end connector and a receiving end connector, and a coupling relationship between the transmitting cavities including the transmitting end and the receiving end; The figure which shows. As shown in FIG. 9C, the transmitting X-axis coupling (CR1, CR2, CR3, TxC) and the receiving X-axis coupling (CR4 ', CR5', CR6 ', RxC) are made in the same manner as in FIG. 9B. Since the Z-axis coupling between the top and bottom does not occur. As shown in FIGS. 9B and 9C, since the conductive cavity is formed up and down, the tuning screws TS1, TS2, TS3, TS4, TS5, TS6, (TS1 ', TS2', TS3 ', TS4') are disposed on the upper and lower sides, respectively. , TS5 ', TS6') shall be provided.

FIG. 10 illustrates a duplexer filter manufactured by combining an elliptic function type band pass filter shown in FIG. 8 laterally, that is, in the Y-axis direction, as a fifth embodiment of the present invention. ) Is a perspective view. As shown in FIG. 10, it can be seen that the two band pass filters shown in FIG. 8A are integrally coupled sideways. X-axis and Z-axis coupling (side and radial coupling) is applied to the coupling between the conductor cavities incorporating a dielectric resonator are the same as in Figure 8a. However, the antenna coupling for coupling the transmitting bandpass filter and the receiving bandpass filter has side coupling in the Y-axis direction. In addition, since the conductive cavity is formed up and down, it is necessary to provide a cover each equipped with a tuning screw in the top and bottom.

The first to fifth embodiments described above also apply to other similar types of filters, i.e., 4-pole filter, 5-pole filter, 7-pole filter, 8-pole filter, 9-pole filter, 10-pole filter, and the like. It is well known that all apply.

Here, after constructing the conductor cavity incorporating the above-mentioned dielectric resonator, as shown in each embodiment, what frequency characteristics appear when the resonant hole size of the at least one conductor cavity and the size of the dielectric resonator are different from each other. The experimental results show that the spurious frequency response of similar filters composed of a conductor cavity with a dielectric resonator is improved.

First, two dielectric resonators of FIG. 1A having different sizes are prepared, one (1) having D = 2.8 cm, L = 1.4 cm, and the other (2) having D = 3.0 cm and L = 1.17 cm. The dielectric resonator 1 is called DR1 and (2) is called DR2. Also, two conductor cavities of FIG. 2b of different sizes are made (1) 2R = 7.5 cm, S = 3.75 cm is C1, and (2) 2R = 80 cm, S = 4.0 cm is C2. .

Fig. 11 shows the frequency characteristics of C1 incorporating DR1. Cursor # 1 is at approximately 1.83 kHz at the designed frequency, and the remaining cursors # 2, # 3, # 4 and # 5 indicate unwanted higher order mode harmonics. This is a frequency characteristic that is used as a reference for comparing the results of experiments performed later. The filters described below are designed to have the same first resonance frequency (cursor # 1) desired by a conductor cavity incorporating at least one dielectric resonator. In other words, the dielectric resonator size or the conductor cavity size may be different, or the dielectric resonator and the conductor cavity size may be different from the rest of the filter constituting the unwanted n order harmonics, for example, cursors. ) Shows how to suppress # 2, # 3, # 4, and # 5.

12 shows the frequency characteristics of C1 incorporating DR2. Compared to FIG. 11, the designed frequency cursor # 1 is the same, and the cursors # 2, # 4, and # 5 move quite a lot. However, cursor # 3, one of the unwanted higher order modes, remains at the same frequency. Accordingly, the frequency cursor # 1 and the unwanted higher order mode cursor # 3, which are designed by combining the cavities representing the characteristics of FIGS. 11 and 12 to form a 2-pole filter, After passing, the remaining higher order mode harmonics cursors # 2, # 4, and # 5 will be very weak.

Fig. 13 shows the frequency characteristics of C2 incorporating DR1. However, in this case, it can be seen that the harmonic mode of cursor # 2 is located at the position similar to the cursor position of FIG.

14 is a frequency characteristic of C2 incorporating DR2, and the higher order mode of frequency cursor # 2 designed in comparison with FIG. 11 is the same as that of frequency cursor # 1 designed in comparison with FIG. It can be seen that the cursors # 2, # 3, # 4 and # 5, which are near the position 1.83 Hz, and the remaining higher order mode harmonics, are all moved considerably. It is clear that combining the two cavities of the characteristics of Figs. 11 and 14 to create a two-pole filter only passes around the designed frequency cursor # 1, 1.83 kHz, and the remaining higher-order harmonics are all very weak.

As a result, when designing similar types of filters, including elliptic function types consisting of conductor cavities incorporating dielectric resonators described so far, the size of at least one dielectric resonator, conductor cavity or both When the filters are combined in a different size from the rest of the filters, the spurious frequency response of the filter is further improved. This method can be applied to a filter composed of not only the filter and duplexer filters shown in FIGS. 6, 7, 8, 9 and 10, but also a conductor cavity incorporating another type of dielectric resonator.

As described above, the filter and the duplexer filter made of a conductor cavity incorporating a dielectric resonator according to the present invention, the at least one conductor cavity and the dielectric resonator constituting the filter is designed differently compared to the remaining conductor cavity and dielectric resonator Can improve the frequency response. In addition, since the conductor cavities are arranged side by side or laminated, various compact filters and duplexer filters of different types can be manufactured by utilizing all of the X-axis, Y-axis, and Z-axis couplings. In addition, the vertical filter can be manufactured using the Z-axis coupling to meet the vertical filter requirements.

The present invention is not limited to the above-described embodiment, and it will be apparent that many modifications are possible by those skilled in the art within the technical spirit of the present invention.

Claims (20)

A metal case having an input terminal and an output terminal configured to perform input / output of signals, and having at least two conductor cavities coupled to each other including the input terminal and the output terminal at predetermined intervals on one or both sides thereof and integrally formed; An input dielectric resonator and an output dielectric resonator coupled with the input terminal and the output terminal, and at least one intermediate dielectric resonator coupled between the input dielectric resonator and the output dielectric resonator, and comprising a conductor cavity for each of the conductor cavities. A dielectric resonator spaced apart at predetermined intervals from the dielectric resonator; And A cover formed in each of the dielectric resonators so as to adjust the resonant frequency, and having tuning screws respectively located in the dielectric resonator region and fastened to the metal case; A filter made of a conductor cavity incorporating a dielectric resonator comprising a. The method of claim 1, wherein each of the input terminal and the output terminal, A connector connected to an external device; A coupling probe connected to the input terminal to couple a high frequency signal from an external device into the conductor cavity, or a coupling probe connected to the output terminal to couple a signal filtered in the conductor cavity to the external device; A filter consisting of a conductor cavity incorporating a dielectric resonator, characterized in that consisting of. The filter of claim 1, wherein an iris is formed in partitions between the conductor cavities for coupling between the conductor cavities. The filter of claim 1, wherein a conductor cavity incorporating a dielectric resonator is installed to connect the conductor cavities for coupling between the conductor cavities. The method of claim 1, wherein the size of the conductor cavity and the size of the dielectric resonator embedded in the conductor cavity are different from the size of the remaining conductor cavity constituting the filter and the size of the dielectric resonator embedded in the other remaining conductor cavity. A filter consisting of a conductor cavity incorporating a dielectric resonator. 6. The dielectric resonator according to claim 5, wherein the first resonant frequency of the conductor cavity having different sizes and the dielectric resonator embedded in the conductor cavity is different from the other conductor cavity satisfying the pre-calculated filter characteristics and the dielectric resonator embedded in the other conductor cavity. A filter consisting of a conductor cavity with a dielectric resonator, characterized in that it is designed to be similar to the first resonant frequency of. The conductor cavity of claim 1 or 5, wherein an input terminal and an output terminal are disposed sideways for side coupling including an X axis and a Y axis between the conductor cavities. A filter made of a conductor cavity incorporating a dielectric resonator, characterized by being arranged in a row or column direction. According to claim 1 or 5, wherein the input and output terminals are arranged up and down so that side coupling including the X-axis and Y-axis coupling between the conductor cavities and Z-axis coupling can be made selectively, A filter comprising a conductor cavity incorporating a dielectric resonator, characterized in that the conductor cavities coupled to the input and output terminals are arranged in a row or column direction. 2. The conductor according to claim 1, wherein the coupling between the conductor cavities serving as the input and the output in the conductor cavities of the continuously arranged and coupled bandpass filters is negatively coupled. Cavity filter. Transmitter-side conductors including the transmitter-end and antenna-end coupled to form a transmitter-end, a receiver-end, and an antenna-end for performing signal input and output, and to configure a transmitter-side bandpass filter between the transmitter-end and the antenna-end. At least two or more cavities are provided on one side or both sides, and at least two receiving side conductor cavities are coupled to one side or both sides so as to form a receiving side band pass filter between the receiving end and the antenna end. A metal case in which a transmitting conductor cavity and a receiving conductor cavity are integrally formed; An input dielectric resonator and an output dielectric resonator coupled with input terminals and output terminals configured in each of the transmitting and receiving conductor cavities, and at least one intermediate dielectric resonator coupling between the input dielectric resonator and the output dielectric resonator. A dielectric resonator including an interpolation and spaced at predetermined intervals in each of the cavities; And A cover formed in each of the dielectric resonators so as to adjust the resonant frequency, and having tuning screws respectively located in the dielectric resonator region and fastened to the metal case; A duplexer filter made of a conductor cavity incorporating a dielectric resonator comprising a. The method of claim 10, wherein each of the transmitting end, the receiving end and the antenna end, A connector connected to an external device; A high frequency signal from an external element connected to the receiving end to couple into the conductor cavity or a signal filtered in the conductor cavity to an external element connected to the transmitting end or input from the transmitting end and the receiving end A coupling probe coupling a signal to an external element and coupling an input signal from an external element to a transmitting end and a receiving end; Duplexer filter consisting of a conductor cavity incorporating a dielectric resonator, characterized in that consisting of. 12. The dielectric resonator of claim 10, wherein, for each of the transmitting bandpass filter and the receiving bandpass filter, an iris is formed in a partition wall between the conductor cavities for coupling between the conductor cavities. Duplexer filter consisting of a conductor cavity with a built-in. 12. The method of claim 10, wherein for each of the transmitting bandpass filter and the receiving bandpass filter, a conducting wire connecting the conductor cavity for coupling between the conductor cavities is characterized in that Duplexer filter consisting of a conductor cavity with a dielectric resonator. The size of the conductor cavity and the size of the dielectric resonator incorporated in the conductor cavity are different for each of the other conductor cavity constituting the filter and the size of the conductor band and the receiver bandpass filter, respectively. A duplexer filter comprising a conductor cavity incorporating a dielectric resonator, characterized in that it is different from the size of the dielectric resonator embedded in the other remaining conductor cavities. 15. The method according to claim 14, wherein for each of the transmitting bandpass filter and the receiving bandpass filter, a conductor cavity having a different size and a first resonance frequency of a dielectric resonator embedded in the conductor cavity satisfy a pre-calculated filter characteristic. And a duplexer filter comprising a conductor cavity incorporating a dielectric resonator, characterized in that it is designed to be similar to the first resonant frequency of the dielectric resonator embedded in the other remaining conductor cavity and the other conductor cavity. 15. The antenna of claim 10 or 14, wherein for each of the transmitting side bandpass filter and the receiving side bandpass filter, a transmitting end and an antenna for side coupling including an X axis and a Y axis between the conductor cavities. However, the antenna cavity and the receiver are arranged side by side, and the conductor cavity coupled to the transmitter, antenna, receiver and antenna are arranged in a row or column direction, respectively. Duplexer Filter. 15. The transmitter and receiver of claim 10 or 14, wherein for each of the transmitting side bandpass filter and the receiving side bandpass filter, a side end including a X axis and a Y axis between the conductor cavities. And a conductor cavity arranged side by side at each of the transmitting end and the receiving end, and a dielectric resonator having a built-in dielectric resonator characterized by stacking a transmitting side bandpass filter and a receiving side bandpass filter which are coupled with an antenna end. Duplexer filter with conductor cavity. 15. The apparatus according to claim 10 or 14, wherein the transmitting end and the receiving end are disposed up and down for side coupling including the X-axis and the Y-axis between the conductor cavities, and the conductor cavity is positioned next to each of the transmitting end and the receiving end. In the case where the transmission band pass filter and the reception band pass filter are stacked and formed, the dielectric band resonator is characterized in that the antenna stage and side coupling are respectively performed for the transmission band pass filter and the reception band pass filter. Duplexer filter consisting of a conductor cavity with a built-in. 15. The method of claim 10 or 14, wherein for each of the transmitting bandpass filter and the receiving bandpass filter, the side coupling and the Z-axis coupling including the X axis and the Y axis between the conductor cavities ( Transmitter and receiver are placed sideways to apply both radial coupling, and the transmitter cavity and the receiver bandpass filter are stacked side by side with the conductor cavity stacked up and down at the transmitter and receiver, respectively. A duplexer filter composed of a conductor cavity incorporating a dielectric resonator, characterized in that arranged in a row. 11. The method of claim 10, wherein for each of the transmitting bandpass filter and the receiving bandpass filter, the coupling between the conductor cavities that perform the function of input and output in the conductor cavity of the continuously arranged and coupled bandpass filter is A duplexer filter consisting of a conductor cavity with a dielectric resonator characterized in that it is negatively coupled.