KR101320896B1 - The Ceramic Panel Dual mode Resonators using Quasi TM110 mode and RF Dual mode Filter by the same - Google Patents

Abstract

The present invention has been developed to reduce the size of a commercially available hexahedron-shaped brick, such as a large-volume RF (Radio frequency) power filter to a panel type, the performance is the same or good, and aims to significantly reduce its size. There is this.
Currently, dual mode filters, metal cavities, ceramic ceramic resonator (DR) filters, etc. all have a large three-dimensional structure, so even if a multi-mode resonator is used, the cube or column is still large in volume and size. It has the shape of a sphere.
In the present invention, even if the Q value is slightly reduced, if the panel-type DR is used to significantly reduce the height to make a two-dimensional filter close to the plate, it resonates in dual mode as a similar TM110-mode or hybrid mode, reducing the number of resonators in half. A structure that maximizes the heat dissipation effect was developed.
Therefore, since the structure of the filter resonator and the resonant pocket are miniaturized in a panel form, they are well matched with other devices in the communication system, and also, in terms of function, the specifications are well suited for easy application to various systems. I made it.

Description

The ceramic panel resonators using similar TMR 110 modulators and the RＦ dual mode filter using the resonators {The Ceramic Panel Dual mode Resonators using Quasi TM110 mode and RF Dual mode Filter by the same}

The present invention relates to a filter for wireless communication, in particular, a comb filter consisting of a resonance pocket of a metal cavity structure currently used and a single filter or a single mode or multi-mode mode) A filter using a ceramic resonator, while miniaturizing the filter, is a filter that significantly improves insertion loss rather than a currently used small ceramic mono-block filter.

In a wireless communication system, an RF filter is essentially used, and currently used filters use a resonator with a capacity of several hundred watts, a large power, and Q of thousands (about 3000 or more) to reduce insertion loss.

Currently, the widely used high power RF filter is a filter using a cavity type 1/4 wavelength transmission line resonator or a ceramic DR (Dielectric Resonator) 610 in the form of a column or disk having high permittivity. Filters are typically used.

Thanks to the rapid development of the communication system, the communication capacity is gradually increasing compared to the past communication equipment, but its size is in a trend to require miniaturization.

This trend is a multi-mode filter that uses up to two (Dual mode), three (Triple mode), and four (Quad mode) resonances in one DR resonator even in a ceramic DR filter. It is a developing trend.

The DR resonator 610 of the general multi-mode filter mentioned above uses other dielectrics, such as alumina 620, 630, in a resonant pocket 640 made of a hexahedral or circumferential or spherical conductor. Due to the problem of supporting the upper and lower and fixing in the middle of the resonant pocket, there is a limit to reducing its volume and size.

In addition, compared to the single mode resonator, the RF power to be handled is increased by 2 times in the dual mode resonator and 3 times in the triple mode resonator. Since the heat generated increases at the same rate, a structure that is well dissipated in heat and a structure capable of miniaturizing its size is very required.
In addition, the currently widely used high power RF filter, that is, the cavity type conductor filter, the single or multimode ceramic filter is bulky (Bulky) resonator 610 and resonant pocket 640, so miniaturization of these filters Is required.
In the dual mode ceramic filter, only the single resonance mode should be coupled between the resonant pockets (001, 002) surrounding the DR resonator.
There is a need for a structure capable of increasing the coupling amount while facilitating coordination between modes between two modes generated by one resonator operating in dual mode.
Since the DR resonator 610 using a general ceramic is located in the air within the resonant pocket 640, in order to fix it, support bars (620, 630) using alumina are DR and the top or bottom surface of the resonant pocket. It is inserted and fixed between them (Fig. 6). At this time, the heat generated from the DR must be transmitted to the body 640 through the support, but the heat dissipation structure is poor due to the physical discontinuity and the structure (long transmission path).
According to the miniaturization of other systems or devices, the size and structure of the filter should also be reduced to facilitate the use by being combined with the filter.

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An object of the present invention is to solve the above problems, and to provide a resonator having a small size and structure and a filter using the same, which can replace a conventional bulky RF filter in a small panel type. .

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The present invention has devised a method for solving the above problems, and is described in the order of the solutions.
2A, 2B, 2C, and 2D, the panel type ceramic resonators 210, 220, 230, and 240 are used to solve the above-mentioned problems of the prior art while satisfying the requirements of the wireless communication system. The form of resonating in dual mode by attaching to the bottom of the resonant pockets (001, 002) made of conductors was developed.
In order to reduce the insertion loss of the filter in the form of a panel, a resonator of a type in which the current flowing through the conductor is increased has been devised, and the conductor plate 300 is attached to the ceramic resonator dielectric 010 as shown in FIGS. 1A, 2A, and 2B. The shape of the conductor plate has various shapes such as a circular conductor plate 300, a quadrangular conductor plate 400, and an octagonal conductor plate 800 according to the dielectric shape of the ceramic resonator.
A disk (circular panel) type 010 having four protrusions 302 or a square (or polygon symmetric with respect to the center) having four protrusions 302 (020, 030) or a cross-shaped dielectric panel 040 When is attached to the bottom of the square resonant pocket (001) or cylindrical resonant pocket (002), the resonance mode that can be generated in the space resonates in a shape similar to TM110-mode, and this mode is similar to TM110-mode (Quasi TM110-mode).
Therefore, in the case of the cylindrical resonant pocket, the height is much smaller than the radius, so if a similar TM110-mode is created, a dual mode can be generated, and the area through which the current flows can be maximized.
This is because a monoblock ceramic filter uses a very small conductor rod with a diameter of 1/4 wavelength, so the current flows in the rod and the resistance felt by the current is large, and a very large current flows in the part that comes into contact with the ground. Therefore, although the quarter-wave resonator Q is very small (typically Q is about 400 to 800), in the technique of the present invention, the area of the current flowing through the surface of the conductor plates 300, 400, 800 can be increased, and the whole Since the effective resistance of the current is very small, Q increases (typically Q>3000), which is effective in reducing the insertion loss of the filter.
In the filter that resonates with a multi-mode resonator, single-mode coupling is not performed because coupling between the resonance pockets (001, 002) surrounding the panel-like similar TM110-dual mode resonator is not easily achieved. The coupling between the resonant pockets is simplified by using a conductor protrusion 301 or a dielectric protrusion 302 for single mode coupling.
In conclusion, the size problem, heat dissipation problem, and the problem of reducing the insertion loss by increasing the Q and the difficult problems such as single mode coupling between resonant pockets are solved by using the present invention as described above.
"Quasi TM110-mode" in the above description, when only a single dielectric material is filled in a low-concentration microwave conductor resonant pocket (001, 002) having a circular or square cross-section, the electric field among the electric and magnetic fields therein is in the Z-axis direction. (Height direction) only (E(z-axis direction)=E J (kr)cosφ, J (kr) is the Besssel function of type 1 order 1), and the magnetic field has a mode in which only the vertical direction in the Z-axis direction exists TM110-mode. In the present invention, the high dielectric and the air layer are present together, but the electric field only occurs in the Z-axis direction. Therefore, the internal length is E=E ₀ F (kr)cosφ ( F (kr) is a function of the nth series of kr) and operates in pseudo TM110-mode, so it is called Quasi TM110-mode in the text.
In addition, the dual mode DR resonator uses a panel-shaped panel resonator (210, 220, 230, 240, 430, 440, 450, 460) having four protrusions 302, so the filter to which it is applied also becomes a panel shape. The volume and size are innovatively small.

DR with four protrusions 302 of the dielectric on the two-dimensional dielectric resonator panel of circular (010), quadrangular (020), octagonal (030), and cross-shaped (040) and four conductor protrusions in the same shape In a dual-mode resonator having a resonator that combines the conductor plates 300, 400, and 800 with a shape of 301, the two modes occurring in the resonator are completely separated by the protrusions 301, 302, so that a single mode between the resonant pockets Only binding was allowed.

In the DR resonator of a flat plate structure operating in dual mode, a small hole (113) is placed in four circular or semi-circular shapes of 45 degrees along the x- and y-axis lines, and a conductor bar (Metal Bar) or When the dielectric bar 115 was inserted, the mode coupling between two modes independent of each other occurred easily in the resonator.

The DR resonator of the flat plate structure was directly attached to the bottom surface of the resonant pockets (001, 002) made of a conductor to maximize the heat dissipation effect.

This panel-structured filter is implemented to be easily combined with other miniaturized systems or components due to its small size.

The present invention can replace the conventional bulky RF filter in a small panel type.

In addition, since the dual-mode DR used in the panel filter is a flat-plate ceramic having a small thickness, mass production is easy, thereby increasing productivity.

And because of its reputation, it is easy to combine with other products and components (such as amplifiers and digital circuits) in wireless communication systems.

Therefore, the ripple effect of the rapid miniaturization trend of the communication system is very great.

1A is a diagram of a 4-pole filter structure using a microstrip line type resonator.
Figure 1b is a 4-pole filter structure diagram using a microwave cavity type resonator with an air gap
Figure 2a is a structural diagram of a microstrip line type resonator
2B is a structural diagram of a strip line type resonator
Figure 2c is a structure diagram of a microwave cavity type resonator with an air gap
Figure 2d is a microwave cavity type resonator structure diagram without air gap
Figure 3 is a conductor resonance pocket diagram of conditions that generate a similar TM110 mode
4 is a view showing various structures of a panel type ceramic resonator.
Figure 5a is a rectangular pocket in the similar TM110 mode resonator E, H field distribution diagram
Fig. 5b is a circular pocket in a similar TM110 mode resonator E, H field distribution diagram.
(DR top metal plate)
Figure 5c is a rectangular pocket in the similar TM110 mode resonator E, H field distribution diagram
(DR top metal plate)
6 is a structural diagram of a ceramic resonator widely used at present.
7 is a computer simulation (Simulation) of the 4-pole dual-mode two Pocket filter using a microstrip line type resonator

The core of the present invention is a miniaturized filter that implements a large RF filter in the form of a hexahedron, such as a conventional brick, in the form of a thin flat panel. The schematic form is shown in FIGS. 1A and 1B.

The structure of the 4-pole filter having a panel ceramic dual mode resonator applied to the present invention is in the form of using the conductor plate 300 in Fig. 1A, and in the case of not using the conductor plate in Fig. 1B.

The structure of a representative filter for implementing the present invention is shown in Fig. 1A, and its computer simulation characteristics are shown in Fig. 7.

The dual-mode resonator applied in the present invention was implemented as a high-permittivity ceramic panel to be a filter of a panel structure, and the structure can be implemented in four types as follows.

Microstrip line type panel ceramic resonator

● (Microstrip line type Resonator. ＃1); Figure 2a

Strip line type panel ceramic resonator

● (Strip line type Resonator. ＃2); Figure 2b

Microwave cavity type panel ceramic resonator with air gap

● (Microwave cavity type Resonator with air gap.＃3); Figure 2c

Microwave cavity type panel ceramic resonator without air gap

● (Microwave cavity type Resonator without air gap. ＃4); Figure 2d

The above four types of dual mode panel resonators have some differences in the Q plane, but they have the characteristics of Q>3000, so they can be applied to filters for wireless communication and any filters in similar fields. A filter can be made by inserting it into any of the resonance pockets of the conductor, that is, the cylindrical resonance pocket 002 or the resonance pocket 001 having a square cross section.

In addition, the four types of resonators have the shape of a panel, such as a circle having four protrusions 302, a square having four protrusions 302, an octagon, a cross having four protrusions 302, and the like, x, y axis ( The panel type resonator as shown in FIG. 4 having a symmetrical structure with respect to the height of z axis) may be used as a dual mode resonator.

1A and 1B are four-pole filters using two resonators, as an example of a filter implementation method using a resonator connected in two stages, but a filter in which the resonators are mounted in a square conductor resonance pocket 001, but the cylindrical conductor resonance It can be used in the pocket 002 and can be implemented with any of the four resonator types of FIGS. 2A, 2B, 2C, and 2D, and the resonator shape can be variously applied as shown in FIG. 4.

When the panel ceramic resonator ＃1 210 is applied, the lower surface of the resonator dielectric 010 having four protrusions 302 is attached to the bottom surface of the resonant pocket 001, and the upper surface of the resonator dielectric 010 is Attached to the conductor plate 300, there is a thin air gap 200 between the conductor plate and the upper side of the resonant pocket, and 5 holes 113 and 114 in the conductor plate 300 as shown in FIG. 2A. ) And the positions and sizes of the five holes 113 and 114 of the resonator dielectric must be the same.

When the panel ceramic resonator #2 220 is applied, both the lower surface of the resonator dielectric 010 having the lower four protrusions 302 and the upper surface of the upper resonator dielectric 010 are top and bottom of the resonant pocket 001. Attached to the ground of the surface, the intermediate conductor 300 of the resonator is attached between the upper and lower resonator dielectrics 010, as shown in FIG. 2B, two resonator dielectrics 010 and five holes of the intermediate conductors 300 (113, 114) This location and size should be the same.

When the panel ceramic resonator #3 (230) is applied, the lower surface of the resonator dielectric (010) having four protrusions (302) is attached to the bottom surface of the resonant pocket (001), and the upper surface of the resonator dielectric (010) There is a thin air layer 200 between the upper side of the resonance pocket, as shown in Figure 2c.

When the panel ceramic resonator ＃4 (240) is applied, both the upper and lower surfaces of the resonator dielectric 010 having four protrusions 302 are attached to the ground of the top and bottom surfaces of the resonant pocket 001. Same as 2d.

Four circular holes (113) of symmetrical shape on the x- and y-axis 45-degree lines for four types of panel ceramic resonators (210, 220, 230, and 240), or four circular holes open at one end of the panel ceramic resonator (113) is formed as shown in Fig. 4, and these are used to control the amount of mode coupling between mutually independent and orthogonal dual modes generated in a resonator.

Since the intensity of the mode coupling varies depending on the distance away from the center of the panel ceramic resonator, the positions and distances away from the center change depending on the pass bandwidth of the filter, but must be placed symmetrically.

In the hole 114 located in the center of the panel ceramic resonator, the E-field becomes zero, so a screw such as a conductor or a non-conductor can be inserted to fix the resonator to the resonant pocket. This function removes the spurious mode.

The roles of the four holes 113 and the fixing hole 114 located at the center of the panel ceramic resonator are the same in the four types of the panel ceramic resonators (FIGS. 2A, 2B, 2C, 2D). Applies.

In addition, if one of the four mode coupling holes or any two holes viewed diagonally from the center of the panel ceramic resonator are selected and the conductor rod 115 or the dielectric rod 115 is inserted and moved up and down, the panel ceramic resonator may move. The amount of coupling between the two independent, independent modes is controlled.

Four conductor protrusions 301 and disc-shaped resonator dielectric 010, quadrangular resonator dielectric 020, and octagonal in the circular conductor plate 300, the quadrangular conductor plate 400, and the octagonal conductor plate 800 The four ceramic protrusions 302 in the resonator dielectric 030 are capable of strongly separating the resonance characteristics while controlling the resonance frequency of each mode when the ceramic resonator is in dual mode and adjusting the coupling amount between the respective resonance pockets. It has a structure.

1A and 1B, when combining between resonant pockets that resonate in dual mode, only one mode must be combined, thereby creating a window through which only one mode can pass between each resonant pocket. The protrusions 301 and 302 of the panel ceramic resonator are positioned on the side, and when there is only a dielectric resonator as shown in FIG. 1B, a conductor 125 for strongly inducing coupling is attached to the end of the dielectric protrusion. At this time, the coupling amount can be adjusted by inserting the adjusting rod 117 into the window.

Adjusting the two resonant frequencies that are resonated in one panel ceramic resonator, adjust the resonant frequency in detail by moving the frequency tuning bar (112) up and down at the opposite protrusions (301, 302) of the protrusions used for coupling between the resonant pockets. (Reasonance frequency fine tuning) becomes possible.
In addition, the adjustment of the amount of coupling between the resonant pockets by the four conductor protrusions 301 or the four dielectric protrusions 302 and the detailed adjustment of the resonance frequency are four types of panel ceramic resonators (FIGS. 2A, 2B, 2C). , 2d).
In a multi-stage filter input/output port 120 using a panel ceramic resonator, a coupling method that allows only one mode to pass between each resonance pocket (same as the control rod 117 and the input and output. The same coupling amount adjusting method using the adjusting rod 117 may be used between connectors of the output port.

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001: Resonant pocket with a regular square cross section
002: Resonant pocket with circular cross section
010: Disc-shaped (circular panel) resonator dielectric with four protrusions 302
020: regular tetragonal resonator dielectric with four protrusions 302
030: Octagonal resonator dielectric with four protrusions 302
040: cross-shaped resonator dielectric
112: frequency tuning rod
113: Mode combination hole
114: hole for fixing the resonator
115: Combined tuning rod between dual modes
117: Coupling tuning rod between pocket and between In/Output connector and resonator
120: In/Output connector
125: conductor for inducing a strong bond
200: air gap between the resonator and the pocket
210: microstrip line type panel ceramic resonator
220: strip line type panel ceramic resonator
230: microwave cavity type panel ceramic resonator with air gap
240: microwave cavity type panel ceramic resonator without air gap
300: circular conductor plate attached in the same plane shape as the dielectric of the ceramic panel resonator
301: conductor protrusion
302: dielectric protrusion
400: regular square conductor plate attached in the same plane shape as the dielectric of the ceramic panel resonator
410: panel type ceramic resonator using a resonator dielectric 010 having four protrusions 302 and a circular conductor plate 300
420: Panel-type ceramic resonator with a mode coupling hole 113 at the edge of (410)
430: Panel-shaped ceramic resonator using a regular quadrangular resonator dielectric 020 and four square conductor plates 400 having four protrusions 302
440: Panel type ceramic resonator using octagonal resonator dielectric 030 and octagonal conductor plate 800 having four protrusions 302
450: Panel type ceramic resonator using cross-shaped resonator dielectric (040)
460: panel type resonator using a cross-shaped resonator dielectric 040 and a circular conductor plate 300
610: disc type ceramic resonator
620, 630: another ceramic support for supporting the ceramic resonator
640: general cube resonance pocket
800: octagonal conductor plate attached in the same plane shape as the dielectric of the ceramic panel resonator

Claims (8)

A panel-type ceramic resonator having a thin high dielectric constant, a disk-shaped resonator dielectric 010 having four dielectric protrusions 302 disposed at equal intervals around it, and four conductor protrusions disposed at equal intervals around it ( Panel-type ceramic resonator 410 using circular conductor plate 300 having 301, and panel-type ceramic resonator 410 having four dielectric protrusions 302 and four conductor protrusions 301. (113) The panel-type ceramic resonator 420 at the edge, and the regular quadrangular resonator dielectric 020 having four dielectric protrusions 302, one at the center of each side, and all four at the center of each side. A panel-type ceramic resonator 430 using a regular square conductor plate 400 having a conductor protrusion 301, and an octagonal resonator dielectric 030 having four dielectric protrusions 302 disposed at equal intervals around it, and A panel-type ceramic resonator 440 using an octagonal conductor plate 800 having four conductor protrusions 301 disposed at equal intervals around it, a panel-type ceramic resonator 450 using a cross-shaped resonator dielectric 040, and , As a panel type ceramic resonator 460 using a cross-shaped resonator dielectric 040 and a circular conductor plate 300,
Any of the six panel-type ceramic resonators 410, 420, 430, 440, 450, 460 having a symmetrical structure with respect to the x and y axes (the z-axis is in the height direction) When using, resonator 210, 220, 230, characterized in that to resonate in the dual mode of Quasi TM110-mode by attaching it to the center of the bottom of the square conductor resonance pocket (001) or cylindrical conductor resonance pocket (002) 240) Structure. According to claim 1,
To operate in Quasi TM110 dual mode, the lower side of the dielectric (010, 020, 030, 040) of the panel type ceramic resonator having four protrusions 302 is attached to the ground of the bottom of the resonance pocket (001) or (002). Become,
The upper surface of the dielectric 010 or 040 is attached to the conductor plate 300, the upper surface of the dielectric 020 is attached to the conductor plate 400, and the upper surface of the dielectric 030 is attached to the conductor plate 800, respectively. The structure of the resonator 210 is characterized in that it has a thin air layer 200 between the conductor plate and the upper side of the resonant pocket, and operates in a microstrip line type. According to claim 1,
To operate in Quasi TM110 dual mode, the dielectrics (010, 020, 030, 040) of the panel-type ceramic resonator having four protrusions 302 are composed of upper and lower dielectrics, respectively, and the lower side of the lower dielectric is a resonance pocket. The bottom surface of (001) or (002) is attached to the ground, and the top surface of the upper dielectric is attached to the top surface of the resonant pocket (001) or (002),
In the dielectric (010, 020, 030, 040) of the panel type ceramic resonator, a conductor plate (300) is attached between the upper and lower dielectrics of the dielectric (010) or (040), and the upper side of the dielectric (020) A conductor plate 400 is attached between the dielectric and the lower dielectric, and a conductor plate 800 is attached between the upper dielectric and the lower dielectric of the dielectric 030, respectively, so that the resonator is characterized by operating in a strip line type ( 220) Structure. According to claim 1,
To operate in Quasi TM110 dual mode, the lower surface of the panel type ceramic resonator dielectric (010, 020, 030, 040) having four protrusions 302 is attached to the bottom surface ground of the resonance pocket 001 or (002) , Between the upper surface of the resonator dielectric (010, 020, 030, 040) and the upper surface of the resonant pocket (001) or (002) to have a thin air layer (Air gap) 200, there is an air gap (Air gap) Resonator 230 structure, characterized in that operating in the microwave cavity type. According to claim 1,
In order to operate in Quasi TM110 dual mode, the upper and lower surfaces of the panel-type ceramic resonator dielectric (010, 020, 030, 040) having four protrusions 302 and the upper surface of the resonance pocket (001) or (002) The structure of the resonator 240, which is attached to the ground of the bottom surface and operates in a microwave cavity type without an air gap. A panel-type ceramic resonator having a thin high dielectric constant, a disk-shaped resonator dielectric 010 having four dielectric protrusions 302 disposed at equal intervals around it, and four conductor protrusions disposed at equal intervals around it ( Panel-type ceramic resonator 410 using circular conductor plate 300 having 301, and panel-type ceramic resonator 410 having four dielectric protrusions 302 and four conductor protrusions 301. (113) The panel-type ceramic resonator 420 at the edge, and the regular quadrangular resonator dielectric 020 having four dielectric protrusions 302, one at the center of each side, and all four at the center of each side. A panel-type ceramic resonator 430 using a regular square conductor plate 400 having a conductor protrusion 301, and an octagonal resonator dielectric 030 having four dielectric protrusions 302 disposed at equal intervals around it, and A panel-type ceramic resonator 440 using an octagonal conductor plate 800 having four conductor protrusions 301 disposed at equal intervals around it, a panel-type ceramic resonator 450 using a cross-shaped resonator dielectric 040, and , As a panel type ceramic resonator 460 using a cross-shaped resonator dielectric 040 and a circular conductor plate 300,
Each of the six panel type ceramic resonators 410, 420, 430, 440, 450, and 460 having four protrusions 302 has a microstrip line type panel ceramic resonator 210 and a strip line type panel ceramic resonator. (220), four types of microwave cavity type panel ceramic resonator 230 with air layer and microwave cavity type panel ceramic resonator 240 without air layer, mutually independent and orthogonal dual mode generated in the resonator To form a mode coupling between them, and to control the amount, four circular holes 113 in a symmetrical shape existing on the x- and y-axis 45-degree lines of the resonator, or four circular one-side open at the end face of the panel-type ceramic resonator The structure in which the hole 113 is in a panel type ceramic resonator and the E-field in the center of the panel type ceramic resonator becomes zero, thereby inserting screws such as conductors or non-conductors to fix the resonator to the resonance pocket. Resonator structure, characterized in that it comprises a hole (114) that can be. A panel-type ceramic resonator having a thin high dielectric constant, a disk-shaped resonator dielectric 010 having four dielectric protrusions 302 disposed at equal intervals around it, and four conductor protrusions disposed at equal intervals around it ( Panel-type ceramic resonator 410 using circular conductor plate 300 having 301, and panel-type ceramic resonator 410 having four dielectric protrusions 302 and four conductor protrusions 301. (113) The panel-type ceramic resonator 420 at the edge, and the regular quadrangular resonator dielectric 020 having four dielectric protrusions 302, one at the center of each side, and all four at the center of each side. A panel-type ceramic resonator 430 using a regular square conductor plate 400 having a conductor protrusion 301, and an octagonal resonator dielectric 030 having four dielectric protrusions 302 disposed at equal intervals around it, and A panel-type ceramic resonator 440 using an octagonal conductor plate 800 having four conductor protrusions 301 disposed at equal intervals around it, a panel-type ceramic resonator 450 using a cross-shaped resonator dielectric 040, and , As a panel type ceramic resonator 460 using a cross-shaped resonator dielectric 040 and a circular conductor plate 300,
Each of the six panel type ceramic resonators 410, 420, 430, 440, 450, and 460 having four protrusions 302 has a microstrip line type panel ceramic resonator 210 and a strip line type panel ceramic resonator. (220), when applied to the four types of microwave cavity type panel ceramic resonator 230 with an air layer and microwave cavity type panel ceramic resonator 240 without an air layer, each mode resonance of dual mode resonance occurring in such a ceramic resonator The resonator is characterized by having four conductor protrusions 301 and four ceramic protrusions 302, which have a function of separately separating resonance characteristics while adjusting the frequency and controlling the amount of coupling between the respective resonance pockets. rescue. A multi-mode panel type RF filter using the resonator structure according to any one of claims 1 to 7.

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