KR100283700B1 - Dielectric filter - Google Patents

Abstract

The present invention relates to a dielectric filter, wherein the first resonator groove, the second resonator groove, and the third resonator groove, which implement filtering characteristics through mutual induction, are respectively formed in a semi-cylindrical shape on the front and the rear of the dielectric body part. In order to make the manufacturing operation more convenient, the first frequency passband adjusting unit, the second frequency passband adjusting unit, and the third frequency passband adjusting unit are formed into a structure to actively adjust the frequency bandwidth (W) that is passed through various shapes. It is an excellent invention that can be actively applied to a circuit requiring filtering characteristics.

Description

Dielectric filter

The present invention relates to a dielectric filter, and more particularly, to form a semi-cylindrical shape in the front and back of the dielectric body portion of the first and second resonance grooves, the third resonance groove and the third resonance groove for implementing the filtering characteristics through mutual induction action Therefore, the present invention relates to a dielectric filter that can be actively applied to a circuit which is easy to manufacture a product and requires various filtering characteristics.

Generally, as illustrated in FIGS. 1 and 2, the dielectric filter 10 has a substantially cylindrical first resonance hole 21 and a second resonance hole 22 therein, and is electrically driven by an electric field. An input terminal implemented by partially grinding the dielectric body portion 20 to induce polarization, the conductor coating 30 plated on the surface of the dielectric body portion 20, and the conductor coating 30. 40 and the first trim part having a predetermined capacitance C _S by grinding the inner surface of the output terminal 50 and the first resonance hole 21 and the second resonance hole 22 in a ring shape. 61 and the second trim part 62.

At this time, the first resonant hole 21 and the second resonant hole 22 are horizontally formed in the longitudinal direction of the dielectric body portion 20 and vertically formed through the same diameter up and down, the first resonant hole ( 21) and the inner circumference of the second resonance hole 22 is plated with a conductor coating 30, which is partially cut into a ring shape through a grinding process, so that the first trim portion 61 and The second trim 62 is implemented.

In general, the diameters of the first resonant hole 21 and the second resonant hole 22 have an inductance, and the conductor coating is formed from the inner circumference of the first resonant hole 21 and the second resonant hole 22. The distance to 30 has a capacitance, and the first trim portion 61 and the second trim portion 62 generally have a coupling capacitance.

However, in the dielectric filter 10 according to the related art, since the first resonance hole 21 and the second resonance hole 22 maintain vertical horizontal spacing in the longitudinal direction inside the dielectric body part 20, they are vertically penetrated. It is not only difficult to form the first resonance hole 21 and the second resonance hole 22, but also because the bandwidth of the passing frequency is fixed as shown in FIG. It is difficult and cannot be applied to a circuit requiring various filtering characteristics.

The present invention has been made to solve the above-mentioned problems, and the object of the present invention is to form a first cylindrical groove, a second resonance groove, and a third resonance groove in a semi-cylindrical shape on the front and rear surfaces of the dielectric body, respectively. The manufacturing process of the product is more convenient, and the dielectric filter provided with the first frequency passband adjusting unit, the second frequency passband adjusting unit, and the third frequency passband adjusting unit to actively adjust the frequency bandwidth (W) to pass through In providing.

1 is a perspective view showing a dielectric filter according to the prior art.

2 is a cross-sectional view showing a dielectric filter according to the prior art.

3 is a graph showing filtering characteristics to which a dielectric filter according to the prior art is applied.

Figure 4 is a perspective view of the dielectric filter according to the present invention from the front.

Figure 5 is a perspective view of the dielectric filter according to the present invention from the back.

6 is a graph showing filtering characteristics to which the dielectric filter according to the present invention is applied.

* Description of the symbols for the main parts of the drawings *

100 dielectric filter 110 dielectric body portion

111: first resonance groove 112: second resonance groove

113: third resonance groove 120: conductor coating

131: first frequency passband adjusting unit

132: second frequency passband adjusting unit

133: third frequency passband adjusting unit

141: first trim part 142: second trim part

143: third trim portion 151: input terminal

152: output terminal

According to an aspect of the present invention, there is provided a dielectric filter including a rectangular body portion having a rectangular parallelepiped for inducing electric polarization, the first resonance groove being recessed and formed in a semi-cylindrical shape at the center of the front surface of the dielectric body. And a second resonance groove and a third resonance groove which are spaced apart from both ends of the rear surface of the dielectric body by a predetermined interval and are recessed and formed in a semi-cylindrical shape, respectively, and the first resonance groove, the second resonance groove, and the third resonance groove. And a first frequency passband adjusting portion for controlling the passband of the frequency by grinding the conductorcoat parallelly plated on the surface of the dielectric body portion by a predetermined distance in both directions of the first resonance groove. Passing the frequency by grinding the conductor coating in parallel in a predetermined interval in both directions of the second resonance groove. A second frequency passband adjusting unit for adjusting a bandwidth, a third frequency passband adjusting unit for adjusting the passband of the frequency by grinding the conductor coating in parallel in a predetermined distance in both directions of the third resonance groove; And a first trim portion and a second trim having a capacitance (C _S ) value by grinding a circular arc at positions spaced apart from the upper end of the first resonance groove, the second resonance groove, and the third resonance groove by a predetermined interval. An input terminal implemented by grinding a surface of an edge portion of the dielectric body portion positioned opposite to the second trim portion and the second trim portion into a rectangular band shape, and the third trim portion opposed to the third trim portion. It includes the output terminal implemented by grinding the surface of the edge of the dielectric body portion in a rectangular band shape. It shall be based on the characteristics.

Hereinafter, a preferred embodiment of the dielectric filter according to the present invention will be described with reference to FIGS. 4 to 6.

4 is a perspective view of the dielectric filter according to the present invention from the front, FIG. 5 is a perspective view of the dielectric filter according to the present invention from the back, and FIG. 6 is a graph showing filtering characteristics to which the dielectric filter according to the present invention is applied.

As shown in FIGS. 4 and 5, the dielectric filter 100 according to the present invention has a rectangular body portion 110 having a rectangular parallelepiped shape for inducing electrical polarization, and a half of the dielectric body portion 110 at the front center of the dielectric body portion 110. A first resonance groove 111 recessed and formed in a cylindrical shape and a second resonance groove 112 recessed and formed in a semi-cylindrical shape, spaced apart from both ends of the rear surface of the dielectric body part 110 by a predetermined interval, and Conductor coating plated on the surface of the dielectric body part 110 including the third resonant groove 113, the first resonant groove 111, the second resonant groove 112, and the third resonant groove 113. 120 and a first frequency passband adjusting unit for grinding the conductor coating 120 in parallel in predetermined directions in both directions of the first resonance groove 111 to adjust a passband W of frequency ( 131 and the conductor coating 120 at predetermined intervals in both directions of the second resonance groove 112. ) In parallel with the second frequency passband adjusting unit 132 for adjusting the passband W of frequency and the conductor coating 120 by a predetermined interval in both directions of the third resonant groove 113. ) And a third frequency passband adjusting unit 133 for adjusting the passband (W) of the frequency in parallel to the grinding process, the first resonance groove 111, the second resonance groove 112, and the third resonance groove. The first trim part 141 and the second trim part 142 and the third trim part having a capacitance (C _S ) value by grinding each arc in a position spaced apart from the upper end of the 113 by a predetermined interval. 143, an input terminal 151 implemented by grinding a surface of an edge portion of the dielectric body portion 110 opposite to the second trim portion 142 into a rectangular band shape, and the third trim. Table of the edge portion of the dielectric body portion 110 which is located opposite the portion 143 The output terminal 152 is implemented by grinding the surface into a rectangular strip shape.

Here, the diameters of the inner circumference of the first resonance groove 111, the second resonance groove 112, and the third resonance groove 113 have an inductance, and the second resonance groove 112 and the third resonance groove The distance from the inner circumference of the 113 to the input terminal 151 and the output terminal 152 has a capacitance, and the first trim 141 and the second trim 142, the third trim 143 ) Has a coupling capacity.

In this case, the filtering characteristics as shown in FIG. 6 may be implemented through mutual induction of the first resonance groove 111, the second resonance groove 112, and the third resonance groove 113. The frequency passband W is filtered in proportion to the grinding width A of the first frequency passband adjuster 131, the second frequency passband adjuster 132, and the third frequency passband adjuster 133. Can get characteristics.

As described above, according to the dielectric filter according to the present invention, the first resonant groove, the second resonant groove, and the third resonant groove implementing the filtering characteristics through mutual induction, respectively, have a semi-cylindrical shape on the front and the rear of the dielectric body. By forming the product, the manufacturing work becomes more convenient, and the molding is provided with a structure having a first frequency passband adjusting unit, a second frequency passband adjusting unit, and a third frequency passband adjusting unit so as to actively adjust the passing frequency bandwidth. There is an excellent effect that can be actively applied to the circuit that requires a variety of filtering characteristics.

Claims (1)

A dielectric filter comprising a rectangular body portion having a rectangular parallelepiped shape for inducing electrical polarization, A first resonance groove recessed and formed in a semi-cylindrical shape at the center of the front surface of the dielectric body portion; A second resonance groove and a third resonance groove which are spaced apart from both ends of the rear surface of the dielectric body by a predetermined interval and are recessed and formed in a semi-cylindrical shape, respectively; A conductive coating plated on the surface of the dielectric body portion including the first resonance groove, the second resonance groove, and the third resonance groove; A first frequency passband adjusting unit for grinding the conductor coating in parallel in predetermined directions in both directions of the first resonance groove to adjust a passband of frequency; A second frequency passband adjusting unit for grinding the conductor coating in parallel in predetermined directions in both directions of the second resonance groove to adjust a passband of frequency; A third frequency passband adjusting unit for grinding the conductor coating in parallel in predetermined directions in both directions of the third resonance groove to adjust a passband of frequency; The first trim part and the second trim part having a capacitance (C _S ) value by grinding in an arc shape at positions spaced apart from the upper end of the first resonance groove, the second resonance groove, and the third resonance groove by a predetermined interval, respectively. With the third trim, An input terminal implemented by grinding a surface of an edge portion of the dielectric body portion opposite to the second trim portion into a rectangular strip shape; And an output terminal formed by grinding a surface of an edge portion of the dielectric body portion opposite to the third trim portion into a rectangular band shape.