KR20130063684A - The ceramic panel rf dual mode filter by quasi tm110 mode - Google Patents

Abstract

PURPOSE: An RF(Radio frequency) dual mode filter is provided to facilitate a combination with other products, to facilitate a mass production, and to miniaturize an RF filter. CONSTITUTION: A ceramic panel resonator of which thickness is thin has a high dielectric constant. The ceramic panel resonator comprises as a circular form, a gad rectangle, a gad octagonal, and a cross-like shape, and has a symmetrical structure about x and y-axis(z-axis is a height direction). A structure(210) resonances in a dual mode of Quasi TM110-mode by attaching in a bottom center inside a conductor resonance pocket in which a height of a square(001) or a cylinder resonance pocket is smaller than a cylinder radius or a square length. [Reference numerals] (AA) Cubic diagram; (BB) Cross-sectional diagram

Description

Ceramic Panel RF Dual Mode Filter using pseudo Tm110 m. {The Ceramic Panel RF Dual mode Filter by Quasi TM110 mode}

The present invention is a filter for wireless communication, a comb filter and a single or multi-mode ceramic, which are made of a resonance pocket having a metal cavity structure. It is a field of filters that greatly improves the insertion loss compared to the small ceramic mono-block filter, which is widely used, while miniaturizing the filter using a ceramic resonator.

RF filters are indispensable in wireless communication systems, and current filters use resonators with high power of several hundred watts and Q of thousands (approximately 3000 or more) to reduce insertion loss.

The most widely used high power RF filter is a filter using a cavity-type quarter-wave resonator or a filter using a ceramic dielectric (DR) 610 in the form of a column or disk having high permittivity. Used as

Thanks to the rapid development of communication system, the communication capacity is getting bigger and bigger than the past communication equipment, but the size is required to be miniaturized.

This trend is a multi-mode filter that uses up to 2, triple, and quad modes in one DR resonator to reduce the size of ceramic DR filters. The trend is developing.

The above-mentioned DR resonator 610 of the general multi-mode filter supports up and down another dielectric such as alumina (620, 630) in a resonant pocket 640 of a hexahedron or cylinder or sphere conductor. Due to the problem of fixing in the middle of the resonant pocket, there is a limit to reducing its volume and size.

In addition, the RF power to be handled is increased by 2 times in the dual mode resonator and 3 times in the triple mode resonator compared to the single mode resonator, and in the multi mode, the power required to handle the number of modes used in the resonator increases. Since the heat generated increases at the same rate, there is a great demand for a structure that is capable of miniaturizing its heat dissipation and its size.

In order to solve the above problems while satisfying the requirements of the wireless communication system, the panel-type ceramic resonators 210, 220, 230, and 240 are mounted on the bottom of the conductor resonant pockets 001 and 002 to resonate in dual mode. To develop the form.

In order to reduce the insertion loss of the filter in the form of a panel, a resonator in which the current flows through the conductor is increased, and the conductive plate 300 is made of a ceramic resonator dielectric as shown in FIGS. 1-1, 2-1, and 2-2. Attached to (010), the shape of the conductor plate has various shapes such as (300, 400, 800) depending on the dielectric shape of the ceramic resonator.

Attach a disc (round panel) or square (or polygon symmetrical about the center) or cruciform dielectric panels (010, 020, 030, 040) to the bottom of the square resonant pocket (001) or cylindrical resonant pocket (002) If the height of the resonant pocket is smaller than the radius of the cylinder or the length of the side of the square, the resonant mode that can be generated in the space resonates in a shape similar to that of the TM110-mode. Quasi TM110-mode) ^* .

Therefore, in the case of the cylindrical resonant pocket, the height is much smaller than the radius, making a similar TM110-mode, can generate a dual mode, and also maximize the current flow area.

This is because the monoblock ceramic filter uses a very small conductor rod with a diameter of 1/4 wavelength, so the current is collected and flows in the rod, so the resistance that the current feels is large, and a very large current flows in the contact area with the ground. Although the quarter-wave resonator Q is very small (Q is generally 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, and 800 can be made large, so that the total current Since the effective resistance of is very small, Q increases (generally Q> 3000), which is effective in reducing the insertion loss of the filter.

In the filter resonating with the multimode resonator, single mode coupling is not possible because coupling between resonant pockets (001, 002) surrounding the panel-like TM110-dual mode resonator is not easy. The coupling between the resonant pockets is simplified by using the protrusions 301 and 302 of the conductor or dielectric for the single mode coupling.

In conclusion, problems such as size problem, heat dissipation problem, problem of reducing insertion loss by increasing Q and single mode coupling between resonant pockets, which have to be improved in general multi-mode filter, have been solved by using the present invention as described above.

^* : Quasi TM110-mode.

When only a single dielectric is filled in a low-frequency microwave conductor resonant pocket (001, 002) with a circular cross section or a square, the electric field in the internal and magnetic fields only occurs in the Z-axis (height direction) (E (z Axial direction) = EJ (kr) cosφ, J (kr) is the Besssel function of order 1 of the first kind), and the magnetic field is TM110-mode in a mode in which only the vertical direction in the Z-axis direction exists. In the present invention, the high dielectric material and the air layer are present together, but the electric field is generated only in the Z axis direction. Therefore, the internal length is called Quasi TM110-mode in the text because E = EOF (kr) cosφ (F (kr) is a function of n-th series of kr) and operates in a similar TM110-mode.

Since large current RF filters, ie, cavity-type conductor filters, single or multi-mode ceramic filters, which are widely used at present, are bulky (640), such miniaturization of such filters is required.

In the dual mode ceramic filter, only the single resonant mode should be coupled between the resonant pockets (001, 002) surrounding the DR resonator.

There is a need for a structure in which the coupling between two modes generated in one resonator operating in dual mode can be easily adjusted and the coupling amount can be increased.

Since the DR resonator 610 using a common ceramic is located in the air in the resonance pocket 640, in order to fix it, support bars (620 and 630) using alumina are disposed on the top or bottom surface of the DR and the resonance pocket. It is inserted in between and fixed (FIG. 6). At this time, the heat generated in the DR should be transferred to the body 640 through the support, due to the physical discontinuity and structure (long transmission path) causes a problem that the heat dissipation structure is not good.

As the size of other systems or devices become smaller, the filters must be smaller in size and structure so that they can be easily combined with the filters.

In order to solve the above problems, the solution method was devised, and described in the order of the problem is as follows.

Since the dual-mode DR resonator uses a plate-shaped panel resonator (210, 220, 230, 240, 410, 420, 430, 440, 450, 460), the filter applied to this also becomes a panel form and innovatively changes the volume and size. It was made small.

Circular, quadrilateral, octagonal and cross-shaped two-dimensional dielectric resonator panels (010, 020, 030, 040) with dielectric protrusions 302 and four conductor protrusions 301 in the same shape as DR. In the dual mode resonator having the resonator combined with the conductor plates 300, 400, and 800, the two modes generated in the resonator are completely separated by the protrusions 301 and 302, so that only the single mode is coupled between the resonant pockets.

In the flat-type DR resonator operating in dual mode, a small hole (Hole) 113 is formed in the form of four circular or semi-circular symmetrical shapes on the x and y axes of 45 degrees. Inserting a dielectric bar 115 allows easy mode coupling between two mutually independent modes in a resonator.

The plated DR resonator was directly attached to the bottom surface of the resonant pockets (001, 002) made of conductors to maximize the heat dissipation effect.

The panel filter has a small size and is easily integrated with other miniaturized systems or components.

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

In addition, since the thickness of the dual mode DR used in the panel filter is less than 10 mm in the form of a flat plate ceramic, mass production is easy, thereby increasing productivity.

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

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

Fig. 1-1: 4-pole filter structure drawing using microstrip line resonator
001: Resonant pocket for TM110 mode with square section
210 (010, 300): Microstrip line panel ceramic resonator structure
010: Ceramic Panel Resonator Dielectric
300: circular conductor plate attached in the same plane shape as the dielectric of the ceramic panel resonator
112: frequency tuning rod
113: hole for mode combination
114: hole for fixing the resonator
115: dual mode coupling tuning rod
117: Coupling tuning rod between pockets and between In / Output connector and resonator
120: In / Output connector
200: air gap between the resonator and the pocket
Fig. 1-2: Structure diagram of 4-pole filter using microwave cavity type resonator with air gap
230: Cavity panel ceramic resonator structure with air gap
125: conductor for inducing strong bonds
2-1: Microstrip line type resonator structure drawing
210: microstrip line panel ceramic resonator structure
301: conductor protrusion
302: dielectric overhang
2-2: Structural drawing of strip line resonator
220: strip line panel ceramic resonator structure
2-3: Structure diagram of microwave cavity type resonator with air gap
230: Microwave cavity panel ceramic resonator structure with air gap
2-4: Structure diagram of microwave cavity type resonator without air gap
240: Microwave cavity panel ceramic resonator structure without air gap
Figure 3: Conductor resonance pocket diagram under conditions of generating similar TM110 mode
001: Resonant pocket with square section
002: Resonant pocket with circular cross section
Figure 4: Various structural diagrams of panel type ceramic resonator
410: Panel-type ceramic resonator using disc resonator dielectric 010 and circular conductor plate 300
Panel-type ceramic resonator with edge at 420: 410
430: Panel-type ceramic resonator using square quadrangle resonator dielectric 020 and square square conductor plate 400
440: Panel-type ceramic resonator using octagonal resonator dielectric 030 and octagonal conductor plate 800
450: Panel type ceramic resonator using cross resonator dielectric 040
460: Panel type ceramic resonator using cross resonator dielectric 040 and circular conductor plate 300
020: square hexagon resonator dielectric
030: Octagonal resonator dielectric
040 cross resonator dielectric
400: square conductor plate attached in the same plane shape as the dielectric of the ceramic panel resonator
800: Octagonal conductor plate attached in the same plane shape as the dielectric of ceramic panel resonator
Figure 5: A similar TM 110 mode resonator E, H field distribution diagram
Figure 6: Structural Drawing of Ceramic Resonators Currently Widely Used
610: disc type ceramic resonator
620, 630: another ceramic support for supporting the ceramic resonator
640: regular hexahedral resonant pocket
Fig. 7: Computer simulation results of a 4-pole filter using a microstrip line resonator

The core of the present invention is a miniaturized filter in which a large RF filter having a hexahedron form such as a conventional brick is formed in a flat panel form, and the schematic forms thereof are as shown in FIGS. 1 and 1 and 2.

The structure of the 4-pole filter having the panel ceramic dual mode resonator applied to the present invention is shown in Fig. 1-1 when the conductor plate 300 is used, and Fig. 1-2 when the conductor plate is not used.

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

In order to be a filter of the panel structure, the dual mode resonator applied in the present invention is implemented by a high-k dielectric panel, and the structure can be implemented in four types as follows.

Microstrip Line Resonators

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

Strip Line Resonator

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

Microwave Cavity Resonator with Air Gap

(Microwave cavity type resonator with air gap. 3); Figure 2-3

Microwave cavity type resonator without air gap

(Microwave cavity type resonator without air gap. ＃ 4); Figure 2-4

The four types of dual mode panel resonators have a slightly different Q side, but have a characteristic of Q> 3000, so they can be applied to wireless communication filters and similar filters. The filter can be made by inserting a resonant pocket made of a conductor, that is, a cylindrical resonant pocket 002 or a resonant pocket 001 having a square cross section.

In addition, the four types of resonators have a panel-shaped resonator having a symmetrical structure with respect to the x- and y-axes (where the height is the z-axis) of circular, rectangular, octagonal and cross-shaped panels. Can be used as a resonator.

1-1 and 1-2 are examples of a filter implementation method using a resonator connected in two stages as a 4-pole filter using two resonators, the filter having the resonator mounted on a square conductor resonant pocket 001, but having a cylindrical shape. It can be used for the conductor resonant pocket (002) of the present invention, and can be implemented in any of the four resonator types of FIGS. 2-1, 2-2, 2-3, and 2-4, and also the shape of the resonator It can be variously applied as shown in 4.

When the panel ceramic resonator # 1 (210) is applied, the lower side of the resonator dielectric 010 is attached to the bottom ground of the resonance pocket 001, and the upper side of the resonator is attached to the conductor plate 300, and the conductor plate thereof. Between the upper side of the over-resonant pocket there is a thin air gap (200), as shown in Fig. 2-1 five holes 113, 114 in the conductor plate 300 and five holes 113 of the resonator dielectric 114) should be identical in location and size.

When the panel ceramic resonator # 2 220 is applied, both the lower side of the lower resonator dielectric 010 and the upper side of the upper resonator dielectric 010 are attached to the ground of the top and bottom surfaces of the resonance pocket 001, and the resonator The intermediate conductor 300 of is attached between the upper and lower resonator dielectric 010. As shown in Fig. 2-2, the two resonator dielectrics 010 and five holes 113 and 114 of the intermediate conductor 300 are formed. The location and size must be the same.

When the panel ceramic resonator # 3 230 is applied, the bottom surface of the resonator dielectric 010 is attached to the bottom ground of the resonator pocket 001, and a thin air layer 200 is formed between the top side of the resonator dielectric and the top side of the resonator pocket. ) Exists and is the same as Figure 2-3.

When applying the panel ceramic resonator # 4 (240), both the upper and lower surfaces of the resonator dielectric 010 is attached to the ground of the upper surface and the bottom surface of the resonance pocket 001, as shown in Figure 2-4.

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

Since the strength of the mode coupling varies depending on the distance away from the center of the panel ceramic resonator, the four holes 113 may be placed in a symmetrical shape, although the position and distance of the four holes 113 may be changed depending on the passband of the filter.

In the hole 114 located at the center of the panel ceramic resonator, since the electric field is zero, a screw such as a conductor or a non-conductor can be inserted to fix the resonator to the resonant pocket. It is a function to remove the spurious mode.

The role of the fixing hole 114 located in the center of the panel ceramic resonator and the hole 113 for the four mode coupling is the four types of panel ceramic resonators (Figs. 2-1, 2-2, 2-3, The same applies to Fig. 2-4).

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

Four conductors and four ceramic protrusions 301 and 302 in FIGS. 1-1, 2-1, and 2-2, and four ceramic protrusions in FIGS. 1-2, 2-3, and 2-4. 302 is a structure in which the ceramic resonator strongly separates the resonance characteristics while controlling the resonance frequency of the resonance time mode in dual mode, and controls the coupling amount between the respective resonance pockets.

In FIGS. 1 and 1 and 2, only one mode must be coupled when coupling between the resonant pockets resonating in the dual mode, so that only one mode can pass between each resonant pocket. The projections 301 and 302 of the panel ceramic resonator are positioned on the side of the window. In this case, when there is only a dielectric resonator as shown in FIGS. 1-2, a metal conductor such as 125 is attached to the end of the dielectric projection. At this time, the coupling amount can be adjusted (Tuning) by inserting the adjusting rod 117 into the window.

Two resonant frequency adjustments resonating in one panel ceramic resonator are performed by moving the frequency tuning bar 112 up and down at opposite protrusions 301 and 302 used for coupling between the resonant pockets. Resonance frequency fine tuning is possible.

In addition, the coupling amount adjustment and the resonant frequency adjustment function between the four resonant pockets by the four conductors or the dielectric protrusions 301 and 302 are provided in four types of panel ceramic resonators (Figs. 2-1, 2-2, and 2). The same applies to -3, Fig. 2-4).

In the multi-stage filter input / output port 120 using the panel ceramic resonator, the protrusions and the mouths are the same as in the coupling method (adjusting rod 117) which allows only one mode to pass between each resonant pocket. The same coupling amount adjusting method using the adjusting rod 117 can be used even between the connector of the output port.

Claims (8)

Thin-walled high dielectric constant ceramic panel resonator with circular (410, 420), square (430), square (440) and cross (450, 460), x, y axis (z axis is the height direction) The resonator, which has a symmetrical structure, is attached to the center of the floor in the conductor resonant pocket of the square (001) or cylindrical (002) resonant pocket, which is much smaller than the radius of the cylinder or the length of the square side. Resonance structure in dual mode (210, 220, 230, 240) In [Claim 1], the lower surface of the dielectric (010, 020, 030, 040) of the ceramic panel resonator is attached to the bottom ground of the resonant pockets (001, 002) in order to operate in Quasi TM110 dual mode. The resonator 210 is attached to the conductor plates 300, 400, and 800, and has a thin air gap 200 between the conductor plate and the upper surface of the resonance pocket to operate in a microstrip line type. In claim 1, the lower side of the lower dielectric of the two dielectrics 010, 020, 030, 040 of the ceramic panel resonator is attached to the bottom ground of the resonant pockets 001, 002 to operate in the Quasi TM110 dual mode. The upper side of the upper dielectric is attached to the upper ground of the resonance pockets (001, 002), and the body plates (300, 400, 800) are also attached between the two dielectrics (010, 020, 030, 040) of the ceramic panel resonator. The structure of the resonator 220 is operated in a strip line type. In [Claim 1], the lower surface of the ceramic panel resonator dielectrics 010, 020, 030, 040 is attached to the bottom ground of the resonant pockets 001, 002 to operate in the Quasi TM110 dual mode. A resonator 230 structure that operates in a microwave cavity type with an air gap by providing a thin air gap 200 between the upper side of 020, 030, 040 and the upper side of the resonant pockets 001, 002. . In [Claim 1], the upper and lower sides of the ceramic panel resonator dielectrics 010, 020, 030, and 040 are attached to the bottom and upper grounds of the resonant pockets 001 and 002 to operate in the Quasi TM110 dual mode. , Structure of resonator 240 operating in microwave cavity type without air gap. Panel ceramic resonators 410, 420, 430, 440, 450, and 460 have four types of resonators: 210, 220, 230, and 240. Independent and orthogonal Quasi TM 110-dual mode (Orthogonal) Dual mode) creates a mode coupling between the four symmetrical circular holes 113 or 4 on one side of the panel ceramic resonator on the x- and y-axis 45-degree lines of the resonator to control the amount. The structure of two circular holes 113 in the panel ceramic resonator and the electric field of the center of the panel ceramic resonator becomes zero, so that the resonator is fixed to the resonance pocket by inserting a screw such as a conductor or a non-conductor. The structure with the hole 114 which can be made. When the panel ceramic resonators 410, 420, 430, 440, 450, 460 are applied to the four types of resonators 210, 220, 230, and 240, each mode resonance of the dual mode resonance occurring in such a ceramic resonator Strongly separating the resonance characteristics while adjusting the frequency, and the structure having four conductor protrusions 301 and four ceramic protrusions 302 having a function of controlling the coupling amount between the respective resonance pockets. Multi-mode panel type RF filter using [claims 1, 2, 3, 4, 5, 6, 7].

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