KR20000039984A - Dielectric ceramic resonator - Google Patents

Abstract

PURPOSE: A dielectric ceramic resonator is provided to minimize the size of the resonator by regulating the length of a dielectric filter. CONSTITUTION: A dielectric ceramic resonator(100) comprises a body(140) made of a dielectric ceramic material. The body(140) has an upper surface(110), a lower surface(120), and an outside surface(130). A pair of resonance holes(152,154) are extended from the upper surface(110) of the body(140) to the lower surface(120) of the body(140). The resonance holes(152,154) are separated from each other by a predetermined distance. The outer surface(130) of the body(140) and the inner surfaces(162) of the resonance holes(152,154) are coated with a conductive material.

Description

Dielectric Ceramic Resonator and Dielectric Filter Using the Same

The present invention relates to a dielectric ceramic resonator and a dielectric filter using the same, and more particularly, to a multi-division dielectric ceramic resonator configured by dividing the dielectric ceramic resonator in multiple transverse directions and a dielectric filter using the same.

A typical dielectric ceramic resonator is composed of one unit coaxially shortened by a quarter wavelength (λ). 1A and 1B show a typical quarter-wave lambda resonator of the above-described configuration. The resonator 10 includes a dielectric ceramic body 12 in which a dielectric ceramic body 12 is coated with a highly conductive material 14 such as silver or copper. The dielectric ceramic body 12 is made of a ceramic compound such as, for example, barium oxide, titanium oxide, zirconium oxide, and the like, and has a resonance hole 16 extending from the upper surface 22 to the lower surface 24 of the body 12. Have This resonant hole 16 is covered with a conductive material 14 such as silver or copper, except for the upper surface 22 of the ceramic body 12, its inner surface and its inner lower surface. The dielectric ceramic resonator 10 may be represented by an equivalent circuit as shown in FIG. 1C.

The single unit resonator illustrated in FIG. 1 can be configured as a modular dielectric filter for use in mobile and portable radio transceivers by connecting several units laterally and having a length that satisfies desired filter response characteristics.

As such, in a modular dielectric filter, the coupling between the resonant holes of the sheathed resonators is through the dielectric material and can be adjusted by varying the width of the dielectric material and the distance between adjacent resonators. The width of the dielectric material between adjacent resonant holes can be adjusted using cylindrical holes, square holes or irregularly shaped holes.

In recent years, the ceramic ceramic filter for the high frequency band of the high frequency band 900MHz or more, which is rapidly increasing in recent years, the length is halved depending on the resonance frequency, but the distance between the terminals is shortened, so that the side effect of insulation increases. In order to solve the above problem, a method of forming various types of holes or grooves between the resonator and the resonator in various directions is performed. However, since only the structural change of the method of forming the grooves and holes is not a remarkable improvement solution, error correction work has been meticulously processed, electrodes, and the like, but there is a problem in that productivity and yield rate are lowered.

On the other hand, in the low frequency bands of 600, 500, and 400MHz or less, due to the resonance frequency, each unit length of the dielectric ceramic filter is more than twice as long as for the band of 900MHz or more.

Therefore, the present invention was devised to solve the above-described problem, and the present invention provides a novel dielectric ceramic resonator and dielectric filter using the same, which can increase the insulation effect by increasing the distance between input and output terminals while reducing the size by reducing the length. For that purpose.

A dielectric resonator according to the present invention for achieving the above object comprises: a body composed of a dielectric ceramic material having an upper surface, a lower surface and an outer surface, the dielectric ceramic body penetrating from the upper surface to the lower surface A pair of resonant holes extending, wherein an outer surface of the dielectric ceramic body and an inner surface of the pair of resonant holes are entirely covered with a conductive material, and a portion of the upper surface of the dielectric ceramic body is formed of the pair of resonant holes. It is covered with a conductive material, including any one of the resonant holes in the resonant cavity, and some other surfaces are not covered, and the lower surface is covered by the conductive material except for the edge portion thereof to connect a pair of resonant holes. Thereby forming a pair of resonator structures connected in series. It is done.

According to another embodiment of the present invention, there is provided a dielectric filter constructed using the above-mentioned dielectric ceramic resonator. The dielectric filter comprises: a plurality of dielectric ceramic resonators connected transversely, each of said dielectric ceramic resonators comprising a body of dielectric ceramic material having an upper surface, a lower surface, and an outer surface, said dielectric ceramic body Has a pair of resonant holes extending from the upper surface to the lower surface, wherein the outer surface of the dielectric ceramic body and the inner surface of the pair of resonant holes are entirely covered with a conductive material, The upper surface comprises a first upper surface which is covered with a conductive material and a second upper surface which is uncovered, including a corresponding one of the pair of resonant holes in the pair of resonant pores, the lower surface except for the edge portion thereof. Is covered by a conductive material to connect a pair of resonant holes; A first electrode connected through a conductive line extending from a resonant hole of an uncoated second upper surface of a first dielectric ceramic resonator of the plurality of dielectric ceramic resonators; A second electrode connected through a conductive line extending from a resonant hole of an uncoated second upper surface of a second dielectric ceramic resonator of the plurality of dielectric ceramic resonators; It characterized in that it comprises a coupling capacitor for connecting the first and second electrodes.

A dielectric filter according to another aspect of the present invention comprises: a plurality of dielectric ceramic resonators connected transversely, each of said dielectric ceramic resonators comprising a body made of dielectric ceramic material having an upper surface, a lower surface and an outer surface; Wherein the dielectric ceramic body has a pair of resonant holes extending from the top surface to the bottom surface, wherein the outer surface of the dielectric ceramic body and the inner surface of the pair of resonant holes are entirely covered with a conductive material. An upper surface of the ceramic resonator comprising a first upper surface that is coated with a conductive material and a second upper surface that is uncovered, including a corresponding one of the pair of resonant holes in the ceramic resonator; Covered by a conductive material except for the edge part of it Connecting a pair of balls, and vacuum; A coupling opening formed by removing a conductive coating on a side of the first upper surface of each dielectric ceramic resonator; And a conductive region formed by partially removing the conductive coating on the outer surface of the second upper surface of each dielectric ceramic resonator.

1A and 1B illustrate the construction of a prior art quarter wave coaxial dielectric ceramic resonator, and FIG. 1C is an equivalent circuit diagram of a dielectric ceramic resonator,

2A and 2B illustrate a configuration of a quarter-wave coaxial dielectric ceramic resonator according to the present invention, and FIG. 2C is an equivalent circuit diagram of the dielectric ceramic resonator.

3 and 4 is a dielectric filter constructed using the dielectric ceramic resonator shown in FIG.

FIG. 5 is an equivalent circuit diagram of the dielectric filter shown in FIGS. 3 and 4.

6 is a graph illustrating transfer characteristics and response characteristics of the dielectric filter illustrated in FIGS. 3 and 4.

Explanation of symbols for main parts of the drawings

10, 100, 210, 220, 310, 320: dielectric ceramic resonator

140: dielectric ceramic body 152, 154: resonant hole

112, 212, 314: first upper surface 114, 214, 312: second upper surface

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

2 shows a configuration of a quarter-wave coaxial dielectric ceramic resonator constructed in accordance with the present invention. As shown, the dielectric ceramic resonator 100 according to the present invention has a form in which the single unit dielectric resonator shown in FIG. 1 is divided into a plurality of sections, for example, a length of two sections, and is laterally coupled.

More specifically, the dielectric ceramic resonator 100 according to the present invention includes a body 140 made of a dielectric ceramic material having an upper surface 110, a lower surface 120, and an outer surface 130. The dielectric ceramic body 140 has a pair of spaced resonant holes 152, 154 extending from the top surface 110 to the bottom surface 120.

The outer surface 130 of the dielectric ceramic body 140 and the inner surface 162 of the pair of resonant holes 152 and 154 are entirely covered with a conductive material. In addition, the upper surface 110 of the dielectric ceramic body 140 includes a first surface 112 that is coated with a conductive material, including one of the pair of resonant holes 152 and 154 (eg, 152). And a second surface 114 which is not covered, including the other resonant hole 154, and the lower surface 120 is formed by the conductive material 170 except for the edge portion 122 thereof. By covering and connecting the pair of resonant holes 152 and 154, a pair of LC parallel resonator structures connected in series as illustrated in FIG. 2C are formed.

The resonator according to the present invention shown in FIG. 2 can be configured as a single modular dielectric filter by connecting several in parallel. FIGS. 3 and 4 are examples of modular dielectric filters, respectively, C-coupled and An L-coupled dielectric ceramic filter is illustrated.

The C-coupled dielectric ceramic filter 200 of FIG. 3 includes a plurality of dielectric ceramic resonators coupled in a lateral direction, and FIG. 3 shows only two ceramic resonators 210 and 220 disposed outwardly therefrom. do.

Each of the ceramic resonators 210 and 220 has an outer surface 211 and 221 coated with a conductive material, such as silver or copper, and a first body coated with a conductive material, similarly to the structure shown in FIG. 2. An upper surface 212, 222 and an uncoated second upper surface 214, 224, each penetrating from the upper surface 212, 222 and 214, 224 to a corresponding lower surface (not shown). It has extending resonant holes 215 and 216 and 225 and 224. At this time, the resonant holes 215, 216 and 225, 226 of the lower surface of each ceramic resonator 210, 220 are covered with a conductive material, similar to the dielectric ceramic resonator shown in FIG. By connecting 215, 216 and 225, 226, a pair of LC parallel resonator structures connected in series are formed, and the remaining components are the same as the ceramic resonator shown in FIG.

In addition, the C-coupled dielectric ceramic filter 200 extends from the resonant holes 216 and 226 of the uncoated upper surfaces 214 and 224 of the respective dielectric ceramic resonators 210 and 220. The first electrode 230 and the second electrode 240 are connected via the (), and one coupling capacitor 250 for connecting the first and second electrodes (230, 240) is further provided. One of the first electrode 230 and the second electrode 240 is used as an input electrode, and the other electrode is used as an output electrode.

Meanwhile, the L-coupled dielectric ceramic filter 300 of FIG. 4 includes a plurality of pairs of dielectric ceramic resonators coupled in a lateral direction, and in FIG. 4, only one pair of ceramic resonators 310, 320).

Each of the ceramic resonators 310 and 320 has the same structure as shown in FIG. 2, and the outer surface 311 and 321 coated with a conductive material, for example, silver or copper, the first body coated with a conductive material. Upper surfaces 314 and 324 and uncoated second upper surfaces 312 and 322, respectively, penetrating from upper surfaces 312 and 322 and 314 and 324 to corresponding lower surfaces (not shown). It has extending resonant holes 315 and 325 and 316 and 326. At this time, the lower surfaces of the resonant holes 315 and 325 and the 316 and 326 of each of the ceramic resonators 310 and 320 are covered by a conductive material similarly to the dielectric ceramic resonator shown in FIG. By connecting 315, 316 and 325, 326, a pair of LC parallel resonator structures connected in series are formed, and the remaining components are the same as the ceramic resonator shown in FIG.

In addition, the L-coupled dielectric ceramic filter 300 partially covers the conductive coating of the outer surface 311, 321 on the side of the uncoated second upper surface 312, 322 of each dielectric ceramic resonator 310, 320. In addition, the present invention further includes regions 340 and 360 formed by the etching method, and coupling openings 410 and 420 formed in opposing surfaces 380 and 390 of the respective dielectric ceramic resonators 310 and 320. When two adjacent dielectric ceramic resonators 310, 320 are coupled to each other, the coupling openings 410, 420 form a capacitive coupling, and either of the regions 340, 360 is used as the input electrode and the other One area is used as an output electrode.

The above-described dielectric filter illustrated in FIGS. 3 and 4 forms a parallel pair of a pair of L-C resonator structures connected in series, such as the equivalent circuit shown in FIG.

FIG. 6 illustrates a graph showing results of verifying characteristics of the dielectric filters illustrated in FIGS. 3 and 4 through experiments. This experiment is a 200 MHz bandpass filter configured by connecting four resonators shown in FIG. 2. The filter implemented as. In this experiment, the start frequency was set to 100 MHz and the stop frequency was set to 300 MHz. In Fig. 6, it can be seen that the 200 MHz bandpass filter employing the configuration of the present invention shows good results in the 200 MHz band, as can be seen from the transfer characteristic curve 610 and the response characteristic curve 620.

Therefore, in constructing the dielectric filter for low frequency and high frequency using the dielectric ceramic resonator according to the present invention, in the low frequency band of 600 MHz or less, the length of the dielectric filter can be freely adjusted as needed, and further miniaturization is possible. In the high frequency band, as the distance between the input and output terminals is increased, the interference between the terminals is attenuated, thereby increasing the insulation effect. Therefore, the length adjustment for miniaturization is possible while the error correction operation can be simplified, thereby providing an effect of improving the characteristics of the filter.

Claims (8)

In dielectric ceramic resonators, A body comprising a dielectric ceramic material having an upper surface, a lower surface, and an outer surface, the dielectric ceramic body having a pair of resonant holes extending from the upper surface to the lower surface, wherein the dielectric ceramic body has a An outer surface and an inner surface of the pair of resonant holes are entirely covered with a conductive material, and some surfaces of the upper surface of the dielectric ceramic body are covered with a conductive material including any one of the pair of resonant holes. And some other surface is not covered, and the lower surface is covered by a conductive material except at its edges to connect a pair of resonator holes, thereby forming a pair of resonator structures connected in series. Multi-part split dielectric ceramic resonator. In the dielectric filter, A plurality of dielectric ceramic resonators connected transversely, each of said dielectric ceramic resonators comprising a body made of dielectric ceramic material having an upper surface, a lower surface, and an outer surface, said dielectric ceramic body being from said upper surface; A pair of resonant holes extending through the lower surface, the outer surface of the dielectric ceramic body and the inner surface of the pair of resonant holes are entirely covered with a conductive material, and the upper surface of the ceramic resonator is the pair A first top surface which is covered with a conductive material and a second top surface which is not covered, including a corresponding one of the resonant holes in the cavity of which the bottom surface is covered by the conductive material except at its edges. Covered to connect a pair of resonant holes; A first electrode connected through a conductive line extending from a resonant hole of an uncoated second upper surface of a first dielectric ceramic resonator of the plurality of dielectric ceramic resonators; A second electrode connected through a conductive line extending from a resonant hole of an uncoated second upper surface of a second dielectric ceramic resonator of the plurality of dielectric ceramic resonators; And a coupling capacitor connecting the first and second electrodes. 3. The dielectric filter of claim 2, wherein any one of the first and second electrodes is an input electrode and the other electrode is an output electrode. 3. The dielectric filter of claim 2, wherein the first and second dielectric ceramic resonators are disposed at the outermost of the plurality of dielectric ceramic resonators. 5. The dielectric filter of claim 4, wherein the first and second electrodes are spaced apart from each other by dielectric ceramic resonators between the first and second dielectric ceramic resonators. In the dielectric filter, A plurality of dielectric ceramic resonators connected transversely, each of said dielectric ceramic resonators comprising a body made of dielectric ceramic material, each having a top surface, a bottom surface, and an outer surface, said dielectric ceramic body being the top surface; A pair of resonant holes extending from the lower surface to the lower surface, wherein the outer surface of the dielectric ceramic body and the inner surface of the pair of resonant holes are entirely covered with a conductive material, and the upper surface of the ceramic resonator is A first top surface that is covered with a conductive material and a second uncovered top surface that includes a corresponding one of the pair of resonant holes in the pair of resonant pores, the bottom surface being in the conductive material except for the edge portion thereof. Covered by a pair of resonant holes; A coupling opening formed by removing a conductive coating on a side of the first upper surface of each dielectric ceramic resonator; And a conductive region formed by partially removing a conductive coating on an outer surface of the second upper surface of each dielectric ceramic resonator. 7. The dielectric filter of claim 6, wherein the first and second dielectric ceramic resonators face each other with the coupling opening therebetween. 8. The dielectric filter of claim 7, wherein the conductive region is selectively used as an input electrode and an output electrode.