KR19990013687A - Integrated dielectric filter with adjustable attenuation ratio in low frequency range - Google Patents

Integrated dielectric filter with adjustable attenuation ratio in low frequency range Download PDF

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Publication number
KR19990013687A
KR19990013687A KR1019980027437A KR19980027437A KR19990013687A KR 19990013687 A KR19990013687 A KR 19990013687A KR 1019980027437 A KR1019980027437 A KR 1019980027437A KR 19980027437 A KR19980027437 A KR 19980027437A KR 19990013687 A KR19990013687 A KR 19990013687A
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South Korea
Prior art keywords
dielectric filter
low frequency
attenuation ratio
frequency region
electrode
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KR1019980027437A
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Korean (ko)
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KR100262498B1 (en
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김진덕
김철호
박상준
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이형도
삼성전기 주식회사
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Priority to KR1019980027437A priority Critical patent/KR100262498B1/en
Priority to SE9804354A priority patent/SE9804354L/en
Priority to US09/212,534 priority patent/US6169465B1/en
Priority to SE9804353A priority patent/SE9804353L/en
Priority to TW087121004A priority patent/TW406467B/en
Priority to TW87121003A priority patent/TW472444B/en
Priority to AT0209998A priority patent/AT411119B/en
Priority to US09/213,707 priority patent/US6636132B1/en
Priority to FR9816167A priority patent/FR2781085A1/en
Priority to GB9827959A priority patent/GB2339341B/en
Priority to AT0211698A priority patent/AT411000B/en
Priority to JP10362665A priority patent/JP2000049507A/en
Priority to DE1998159207 priority patent/DE19859207A1/en
Priority to DE19859205A priority patent/DE19859205A1/en
Priority to FR9816398A priority patent/FR2781086B1/en
Priority to GB9827893A priority patent/GB2339340B/en
Priority to JP10364600A priority patent/JP2000049504A/en
Priority to CNB98126557XA priority patent/CN1229892C/en
Priority to CN98126703.3A priority patent/CN1201428C/en
Priority to BR9900051-2A priority patent/BR9900051A/en
Priority to BR9900178-0A priority patent/BR9900178A/en
Publication of KR19990013687A publication Critical patent/KR19990013687A/en
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Publication of KR100262498B1 publication Critical patent/KR100262498B1/en

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
    • H01P1/00—Auxiliary devices
    • H01P1/20—Frequency-selective devices, e.g. filters
    • H01P1/201—Filters for transverse electromagnetic waves
    • H01P1/205—Comb or interdigital filters; Cascaded coaxial cavities
    • H01P1/2056—Comb filters or interdigital filters with metallised resonator holes in a dielectric block
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
    • H01P1/00—Auxiliary devices
    • H01P1/20—Frequency-selective devices, e.g. filters
    • H01P1/201—Filters for transverse electromagnetic waves
    • H01P1/205—Comb or interdigital filters; Cascaded coaxial cavities
    • H01P1/2053—Comb or interdigital filters; Cascaded coaxial cavities the coaxial cavity resonators being disposed parall to each other
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
    • H01P1/00—Auxiliary devices
    • H01P1/20—Frequency-selective devices, e.g. filters
    • H01P1/207—Hollow waveguide filters
    • H01P1/208—Cascaded cavities; Cascaded resonators inside a hollow waveguide structure
    • H01P1/2084—Cascaded cavities; Cascaded resonators inside a hollow waveguide structure with dielectric resonators
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
    • H01P7/00—Resonators of the waveguide type
    • H01P7/06—Cavity resonators
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
    • H01P7/00—Resonators of the waveguide type
    • H01P7/10—Dielectric resonators

Abstract

본 발명은 통과대역을 기준으로 낮은 주파수영역에서의 대역외 신호를 더 놓은 감쇄비로 감쇄시킬 수 있는 낮은 주파수영역에서의 감쇄비조정이 가능한 일체형 유전체 필터에 관한 것으로, 유전체블록과, 유전체블록의 전면과 후면을 관통하여 형성되며 내부면에 전극이 형성되는 복수개의 공진홀과, 상기 유전체블록의 전면을 제외한 모든 면에 형성되는 접지전극과, 상기 전극의 일부분을 다른 부분과 단락시켜 형성한 입출력전극과, 상기 유전체블록의 전극이 형성되지 않은 개방면에 어떤 접지전극과도 연결되지 않은 스트립라인패턴을 구비한다.The present invention relates to an integrated dielectric filter capable of adjusting the attenuation ratio in a low frequency region capable of attenuating the out-of-band signal in a low frequency region with a further attenuation ratio based on a passband. And a plurality of resonant holes formed through the rear surface and having an electrode formed therein, a ground electrode formed on all surfaces except the front surface of the dielectric block, and an input / output electrode formed by shorting a portion of the electrode with another portion. And a stripline pattern not connected to any ground electrode on an open surface on which the electrode of the dielectric block is not formed.

Description

낮은 주파수영역에서의 감쇄비조정이 가능한 일체형 유전체 필터Integrated dielectric filter with adjustable attenuation ratio in low frequency range

본 발명은 일체형 유전체 필터에 관한 것으로, 보다 상세하게는 통과대역을 기준으로 저주파영역에서 원하는 대역의 감쇄비조정이 용이한 낮은 주파수영역에서의 감쇄비조정이 가능한 일체형 유전체 필터에 관한 것이다.The present invention relates to an integrated dielectric filter, and more particularly, to an integrated dielectric filter capable of adjusting the attenuation ratio in a low frequency region where the attenuation ratio of a desired band is easily adjusted in a low frequency region based on a pass band.

일반적으로, 유전체 필터는 동축형 공진기가 구비된 유전체블록을 다수개 연결하여 원하는 통과대역특성을 얻은 것이며, 일체형 유전체 필터는 상기 유전체필터에서 한단계 진보된 필터로, 한 유전체블록내에 다수개의 동축형 공진기를 형성하여 구조를 간략화시킨 것이다.In general, a dielectric filter is obtained by connecting a plurality of dielectric blocks having a coaxial resonator to obtain desired passband characteristics. An integrated dielectric filter is an advanced filter in the dielectric filter, and a plurality of coaxial resonators in one dielectric block. To simplify the structure.

이러한 유전체필터는 고주파대역을 통신대역으로 이용하는 카폰이나 휴대폰등과 같은 이동통신장비에서 원하는 채널대역의 신호만을 얻기 위해 대역통과필터로 사용되는 것으로서, 그렇기 때문에, 유전체필터는 소형화, 경량화 및 높은 내충격성이 요구되며, 20∼30MHz의 대역통과특성이 필요하다.The dielectric filter is used as a bandpass filter to obtain a signal of a desired channel band only in a mobile communication device such as a car phone or a mobile phone using a high frequency band as a communication band. Therefore, the dielectric filter has a small size, light weight, and high impact resistance. This is required and a bandpass characteristic of 20 to 30 MHz is required.

도1∼도3은 종래의 일체형유전체필터를 보이는 것으로서, 도1에 보인 일체형유전체필터는 공진홀(7,8) 사이에 결합공(9)를 형성하여 상호인덕턴스 및 상호캐패시턴스를 조정하도록 한 것으로, 결합공(9)의 크기, 길이, 위치 등에 의해 결합도가 결정된다. 그리고, 이러한 결합공(9)의 증가는 유전체필터의 성형의 어려움과 기계적강도저하가 뒤따르기 때문에, 현 이동통신기기의 요구사항을 맞추기 어려운 문제점이 있다. 그리고, 도2에 보인 일체형 유전체 필터는 공진홀(7,8)의 내경을 일정하게 하지 않고, 특정부분에서 달리하여 그 내경차이로 인한 특성임피던스차에 의하여 결합이 이루어지도록 한 것인데, 도1의 유전체필터에 비하여 특성은 개선되지만 작은 공진홀의 내경을 달리함으로서 제조가 복잡해지고 균일한 성형체를 얻기가 어려운 문제점이 발생한다. 그리고, 도3에 도시한 또 다른 유전체필터는 다른 유전체필터와는 달리 개방면이 없이 유전체블록(1)의 전 표면에 외부전극을 형성하고, 공진홀(7,8)의 내부 특정 부분(17,18)의 전극을 제거하여 공진기간의 결합을 이룬 것이다. 이 유전체필터는 작은 공진홀(7,8) 내부면의 임의 위치에서 정확하게 전극을 제거하기 어려운 문제점이 있다.1 to 3 show a conventional integrated dielectric filter, in which the integrated dielectric filter shown in FIG. 1 forms a coupling hole 9 between resonance holes 7, 8 to adjust mutual inductance and mutual capacitance. The degree of coupling is determined by the size, length, position, and the like of the coupling holes 9. In addition, the increase in the coupling hole 9 is difficult to meet the requirements of the current mobile communication device because of the difficulty in forming the dielectric filter and the decrease in mechanical strength. In addition, the integrated dielectric filter shown in FIG. 2 does not make the inner diameters of the resonant holes 7 and 8 constant, but is made to be coupled by a characteristic impedance difference due to the difference in the inner diameters in a specific part. Compared to the dielectric filter, the characteristics are improved, but the production of the complex cavity is difficult due to varying the inner diameter of the small resonant holes, and it is difficult to obtain a uniform molded body. In addition, unlike other dielectric filters, another dielectric filter shown in FIG. 3 forms an external electrode on the entire surface of the dielectric block 1 without an open surface, and internal specific portions 17 of the resonance holes 7 and 8. 18 is removed to form a resonance period. This dielectric filter has a problem that it is difficult to remove the electrode accurately at any position on the inner surface of the small resonance holes 7 and 8.

또한, 통신채널사이의 간격이 점점 더 가까워지고 있는 요즈음에는 유전체 필터에 더 높은 감쇄특성이 요구되며, 특히 송신채널, 수신채널과 같이 상당히 근접해 있는 경우에는, 특정대역에서 더 높은 감쇄비가 요구된다.In addition, these days, when the spacing between communication channels is getting closer, a higher attenuation characteristic is required for the dielectric filter, and especially in the case of being very close such as a transmission channel and a reception channel, a higher attenuation ratio is required in a specific band.

예를 들어, 송신채널을 통과대역으로 갖는 유전체필터의 경우, 그 통과대역을 기준으로 저주파영역에 근접해 있는 수신채널의 신호가 혼입되지 않도록, 저주파영역에서 더 높은 감쇄비가 요구되는데, 상기와 같은 종래의 유전체필터는 이러한 요구를 만족시킬 수 없었다.For example, in the case of a dielectric filter having a transmission channel as a pass band, a higher attenuation ratio is required in the low frequency region so that a signal of a reception channel close to the low frequency region is not mixed with respect to the pass band. The dielectric filter of cannot satisfy this requirement.

본 발명은 상기와 같은 종래의 문제점을 해결하기 위하여 안출된 것으로, 그 목적은 통과대역을 기준으로 보다 낮은 주파수의 대역외 신호를 더 높은 감쇄비로 저지할 수 있는 낮은 주파수영역에서의 감쇄비조정이 가능한 일체형 유전체 필터를 제공하는 것이다.SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional problems, and its object is to provide attenuation ratio adjustment in a low frequency region that can block out-of-band signals of a lower frequency with a higher attenuation ratio based on a passband. It is possible to provide an integral dielectric filter.

본 발명의 또 다른 목적은 통과대역을 기준으로 보다 낮은 주파수대역중 사용자가 원하는 주파수의 대역외신호를 더 높은 감쇄비로 저지할 수 있는 낮은 주파수영역에서의 감쇄비조정이 가능한 일체형 유전체 필터를 제공하는 것이다.It is still another object of the present invention to provide an integrated dielectric filter capable of adjusting the attenuation ratio in a low frequency region capable of blocking an out-of-band signal of a desired frequency among the lower frequency bands based on a passband with a higher attenuation ratio. will be.

도1는 종래 일체형 유전체 필터의 일예를 보이는 사시도이다.1 is a perspective view showing an example of a conventional integrated dielectric filter.

도2(a)는 종래 일체형 유전체 필터의 다른 예를 보이는 사시도이다.Figure 2 (a) is a perspective view showing another example of a conventional integrated dielectric filter.

도2(b)는 도2(a)에 도시한 일체형 유전체 필터의 A-A'선 단면도이다.FIG. 2B is a cross-sectional view taken along the line A-A 'of the integrated dielectric filter shown in FIG.

도3(a)는 종래 일체형 유전체 필터의 또 다른 예를 보이는 사시도이다.Figure 3 (a) is a perspective view showing another example of a conventional integrated dielectric filter.

도3(b)는 도3(a)에 도시한 일체형 유전체 필터의 B-B'선 단면도이다.Fig. 3B is a cross-sectional view taken along line B-B 'of the integrated dielectric filter shown in Fig. 3A.

도4a,b,c는 본 발명에 의한 일체형 유전체 필터의 일실시예를 보이는 사시도이다.4A, 4B and 4C are perspective views showing one embodiment of the integrated dielectric filter according to the present invention.

도5는 본 발명에 의한 일체형 유전체 필터의 등가회로도이다.5 is an equivalent circuit diagram of an integrated dielectric filter according to the present invention.

도6은 본 발명에 의한 일체형유전체필터와 종래의 일체형 유전체필터의 특성을 비교하는 그래프이다.6 is a graph comparing the characteristics of the integrated dielectric filter and the conventional integrated dielectric filter according to the present invention.

*도면의 주요부분에 대한 부호의 설명** Description of the symbols for the main parts of the drawings *

1 ... 유전체블록 3 ... 접지전극1 ... dielectric block 3 ... ground electrode

5 ... 개방면 7, 8 ... 공진홀5 ... opening surface 7, 8 ... resonance hole

9 ... 결합공 10 ... 입출력전극9 ... coupling hole 10 ... input / output electrode

19 ... 스트립라인19 ... stripline

상술한 본 발명의 목적을 달성하기 위한 구성 수단으로서, 본 발명은 낮은 주파수영역에서의 감쇄비조정이 가능한 일체형 유전체필터에 있어서,As a constitutional means for achieving the above object of the present invention, the present invention provides an integrated dielectric filter capable of adjusting the attenuation ratio in a low frequency region.

유전체블록과,Dielectric block,

유전체블록의 전면과 후면을 관통하여 형성되며 내부면에 전극이 형성되는 복수개의 공진홀과,A plurality of resonance holes formed through the front and rear surfaces of the dielectric block and having electrodes formed therein;

상기 유전체블록의 전면을 제외한 모든 외부면에 형성되는 접지전극과,A ground electrode formed on all outer surfaces except the front surface of the dielectric block;

상기 접지전극의 일부분을 다른 부분과 단락시켜 형성한 입출력전극과,An input / output electrode formed by shorting a portion of the ground electrode with another portion;

상기 유전체블록의 전극이 형성되지 않은 개방면에 어떤 접지전극과도 연결되지 않도록 형성된 스트립라인패턴을 구비함을 특징으로 한다.The strip line pattern is formed so as not to be connected to any ground electrode on an open surface on which the electrode of the dielectric block is not formed.

이하, 첨부한 도면을 참조하여 본 발명의 구성 및 작용을 상세하게 설명한다.Hereinafter, with reference to the accompanying drawings will be described in detail the configuration and operation of the present invention.

도4a, 도4b, 도4c는 본 발명에 따른 일체형 유전체 필터의 일실시예를 도시한 사시도로서, 도4a는 유전체블록(1)과, 상기 유전체블록(1)의 전면과 후면을 관통하여 형성되며 내부면에 전극이 형성되는 공진홀(7,8)과, 상기 유전체블록(1)의 전면으로 전극이 형성되지 않은 개방면(5)과, 상기 유전체블록(1)의 개방면(5)을 제외한 모든 표면을 둘러쌓며 형성되는 접지전극(3)과, 상기 접지전극(3)의 일부분을 ㄱ자형태로 다른 부분과 단락시키고 상기 개방면(5)방향은 오픈시킨 입,출력전극(10a, 10b)과, 상기 공진홀(7,8)의 내부전극에 연장되어 개방면(5)상에 형성되는 전극패턴(7a, 8a)과, 상기 개방면(5)상의 두 공진홀(7,8)과 입출력전극(10a, 10b) 사이에 형성된 스트립라인패턴(19)으로 구성된다.4A, 4B, and 4C are perspective views showing one embodiment of the integrated dielectric filter in accordance with the present invention, and FIG. 4A is formed through the dielectric block 1 and the front and rear surfaces of the dielectric block 1. Resonator holes 7 and 8 having electrodes formed therein, open surfaces 5 in which no electrodes are formed in front of the dielectric block 1, and open surfaces 5 of the dielectric block 1. The ground electrode 3 is formed to surround all surfaces except for, and a portion of the ground electrode 3 is short-circuited with other portions in an L-shape, and the open surface 5 is open to the input and output electrodes 10a, 10b, electrode patterns 7a and 8a extending on the internal electrodes of the resonance holes 7 and 8 and formed on the open surface 5, and two resonance holes 7 and 8 on the open surface 5; ) And a stripline pattern 19 formed between the input / output electrodes 10a and 10b.

그리고, 본 발명의 다른 실시예인 도4b에서는, 유전체블록(1)과, 상기 유전체블록(1)의 전면에서 후면을 관통하여 형성되며 내부면에 전극이 형성되는 두 공진홀(7,8)과, 상기 유전체블록(1)의 전면을 제외한 전 표면에 형성되는 접지전극(3)과, 상기 접지전극(3)의 입부분을 ㄱ자형태로 다른 부분과 단락시키며 전극이 형성되지않은 개방면(5)으로도 오픈되지 않은 입,출력전극(10a, 10b)과, 상기 유전체블록(1)의 개방면(5)상의 두 공진홀(7,8)과 입,출력전극(10a, 10b)이 형성된 면사이에 형성되는 스트립라인패턴(20)으로 구성된다.In addition, in FIG. 4B, another embodiment of the present invention, the dielectric block 1, two resonance holes 7 and 8 formed through the rear surface of the dielectric block 1, and the electrode is formed on the inner surface thereof; The ground electrode 3 formed on the entire surface of the dielectric block 1 except for the front surface of the dielectric block 1 and the opening of the ground electrode 3 are short-circuited with other portions in an L-shape, and the electrode is not formed. Input and output electrodes 10a and 10b, which are not opened by?, Two resonant holes 7 and 8 and input and output electrodes 10a and 10b formed on the open surface 5 of the dielectric block 1, respectively. The strip line pattern 20 is formed between the surfaces.

또한, 본 발명의 응용예로서 도4c에서는, 유전체블록(1)과, 상기 유전체블록(1)의 전면과 후면을 관통하여 형성되는 두 공진홀(7, 8)과, 상기 유전체블록(1)의 전면을 제외한 모든 외부면에 형성되는 접지전극(3)과, 상기 접지전극(3)의 일부분을 다른 부분과 단락시키고 전극이 형성되지 않은 개방면(5)으로도 오픈되지 않게 형성한 입,출력전극(10a, 10b)과, 상기 유전체블록(1)의 개방면(5)상에 T자로 형성되는 스트립라인패턴(21)으로 구성된다.In addition, in FIG. 4C as an application of the present invention, the dielectric block 1, two resonance holes 7 and 8 formed through the front and rear surfaces of the dielectric block 1, and the dielectric block 1 A ground electrode 3 formed on all outer surfaces except for the front surface of the ground electrode, and a portion of the ground electrode 3 shorted to another portion and not opened to the open surface 5 where the electrode is not formed; It consists of an output electrode (10a, 10b) and a strip line pattern 21 formed of a letter T on the open surface (5) of the dielectric block (1).

상기와 같이 도4a, 도4b, 도4c에 도시한 본 발명의 실시예들의 등가회로는 제5도에 도시한 회로도로 동일하다.As described above, the equivalent circuits of the embodiments of the present invention shown in FIGS. 4A, 4B, and 4C are the same as those shown in FIG.

상기 제5도에서, IN은 입력전극(10a)에 의한 입력단이고, OUT은 출력전극(10b)에 의한 출력단이며, 51은 공진홀(7)에 의하여 입력과 접지사이에 형성되는 동축형 공진기로 L1은 자기인덕턴스, C1은 자기캐패시턴스이다. 52는 공진홀(8)에 의하여 출력과 접지사이에 형성되는 동축형공진기로 L1은 동축형공진기의 자기인덕턴스, C1은 자기캐패시턴스이다. 그리고, 53은 스트립라인패턴(19, 20, 21)에 의해 형성된 공진기로서 Lm은 두 동축형공진기(51, 52)간의 상호인덕턴스, Cm은 상호캐패시턴이다. 그리고, C01, CO2, C03은 각 공진기 및 입출력단간의 결합캐패시턴스이다.In FIG. 5, IN is an input terminal by the input electrode 10a, OUT is an output terminal by the output electrode 10b, and 51 is a coaxial resonator formed between the input and the ground by the resonance hole 7. L1 is magnetic inductance and C1 is magnetic capacitance. Reference numeral 52 is a coaxial resonator formed between the output and the ground by the resonance hole 8, where L1 is the magnetic inductance of the coaxial resonator and C1 is the magnetic capacitance. In addition, 53 is a resonator formed by the stripline patterns 19, 20, and 21, where Lm is mutual inductance between two coaxial resonators 51 and 52, and Cm is mutual capacitance. And C01, CO2, and C03 are coupling capacitances between the resonators and the input / output terminals.

상술한 도4a, 도4b, 도4c에 도시한 일체형 유전체 필터는 그 구조에 있어서 약간씩의 차이가 있으나, 기본적인 작용은 동일하다.Although the integrated dielectric filters shown in Figs. 4A, 4B, and 4C described above are slightly different in their structure, the basic functions are the same.

이하, 도4a를 대표로 하여 본 발명에 따른 일체형 유전체 필터의 작용을 설명하고, 도4b, 도4c에 도시한 일체형 유전체 필터의 중복되는 설명은 생략한다.Hereinafter, the operation of the integrated dielectric filter according to the present invention will be described with reference to FIG. 4A, and overlapping descriptions of the integrated dielectric filter shown in FIGS. 4B and 4C will be omitted.

도4a에서, 이 일체형 유전체 필터는 상술한 바와 같이 도5와 같이 표현된다. 상기에서, 입력단자로 전기신호가 인가되면, 두 공진홀(7,8)에 전기장이 형성되며 두 공진기로 작용한다. 이때, 접지되어 있지 않은 스트립라인패턴(19)은 두 공진홀(7,8)간의 상호캐패시턴스(Cm)를 스트립라인패턴(19)이 구비되지 않았을 경우보다 증가시킨다. 또한, 상기 상호캐패시턴스의 증가율은 스트립라인패턴(19)의 길이, 폭에 따라 조정가능한데, 패턴(19)의 길이 및 폭을 증가시키면 상호캐패시턴스(Cm)는 증가하고 상호인덕턴스(Lm)는 감소한다.In FIG. 4A, this integrated dielectric filter is expressed as shown in FIG. 5 as described above. In the above, when an electric signal is applied to the input terminal, an electric field is formed in the two resonant holes (7, 8) and act as two resonators. At this time, the non-grounded stripline pattern 19 increases the mutual capacitance Cm between the two resonance holes 7 and 8 than when the stripline pattern 19 is not provided. In addition, the increase rate of the mutual capacitance is adjustable according to the length and width of the stripline pattern 19. When the length and width of the pattern 19 are increased, the mutual capacitance Cm increases and the mutual inductance Lm decreases. .

즉, 도5의 등가회로에서와 같이, 스트립라인패턴(19)에 의하여 두 공진홀(7,8)간의 상호인덕턴스(Lm) 및 상호캐패시턴스(Cm)가 형성되어, 입출력라인사이에 LC병렬공진기를 구비시킨 것과 같이 동작하게 된다.That is, as in the equivalent circuit of FIG. 5, the mutual inductance Lm and the mutual capacitance Cm are formed between the two resonance holes 7 and 8 by the stripline pattern 19, and the LC parallel resonator is formed between the input and output lines. It is operated as provided.

따라서, 상기 상호인덕턴스(Lm) 및 상호캐패시턴스(Cm)에 따른 공진점에서 임피던스값이 최대가 되어, 상기 공진점에서 감쇄가 최대로 일어나게 된다.Therefore, the impedance value becomes maximum at the resonance point according to the mutual inductance Lm and the mutual capacitance Cm, and the attenuation occurs at the resonance point to the maximum.

그리고, 상기 공진점은 상호인덕턴스(Lm) 또는 상호캐패시턴스(Cm) 또는 두 값을 변화시킴에 의하여 변경된다. 상기와 같이 스트립라인패턴(19)의 길이 및 폭을 변경시킴에 의하여 상호인덕턴스(Lm) 및 상호캐패시턴스(Cm)의 값을 변화시킬 수 있으므로, 결과적으로, 상기 스트립라인패턴(19)의 길이 및 폭을 조정함에 의하여 감쇄포인트를 조정할 수 있게 된다.The resonance point is changed by changing mutual inductance Lm or mutual capacitance Cm or two values. By changing the length and width of the stripline pattern 19 as described above, the values of the mutual inductance Lm and the mutual capacitance Cm can be changed. As a result, the length and width of the stripline pattern 19 can be changed. By adjusting the width, the attenuation point can be adjusted.

더하여, 상기와 같이 상호캐패시턴스(Cm)가 스트립라인패턴(19)이 없는 경우보다 증가됨으로서, 감쇄포인트는 항상 일체형 유전체 필터의 통과대역을 기준으로 낮은 주파수영역에 위치하게 된다. 따라서, 상기 스트립라인패턴(19)으로 통과대역보다 낮은 주파수영역에서의 감쇄비 조정이 이루어진다.In addition, as described above, since the mutual capacitance Cm is increased than when the stripline pattern 19 is absent, the attenuation point is always located in the low frequency region with respect to the pass band of the integrated dielectric filter. Therefore, the attenuation ratio is adjusted in the frequency region lower than the pass band with the stripline pattern 19.

지금까지 설명한 도4a의 일체형 유전체 필터외에 도시된 도4b, 도4c의 일체형 유전체필터도 상술한 바와 같이 동일한 작용을 하며, 이러한 다른 실시예들은 본 발명에 따라 개방면상에서 통과대역보다 낮은 주파수영역에서 감쇄포인트를 형성하는 스트립라인패턴이 도4a에 도시한 입,출력전극(10a, 10b)이 개방면(5)으로 오픈된 구조의 일체형유전체필터와 도4b에 도시한 입,출력전극(10a, 10b)이 개방면(5)으로 오픈되지 않은 구조의 일체형 유전체픽터에서도 동일한 작용을 함을 보이기 위한 것이며, 도4c와 같이 상기 스트립라인패턴을 일자가 아닌 T자 형태로 하더라도 그 작용은 상술한 도4a의 경우와 동일하다.In addition to the integrated dielectric filter of FIG. 4A described above, the integrated dielectric filter of FIGS. 4B and 4C also performs the same function as described above, and these other embodiments are in the frequency region lower than the passband on the open surface according to the present invention. An integrated dielectric filter having a structure in which the strip line patterns forming the attenuation points are shown in FIG. 4A with the input and output electrodes 10a and 10b open to the open surface 5, and the input and output electrodes 10a and 4 shown in FIG. 4B. 10b) is intended to show the same action even in the integral dielectric pictograph of the structure which is not opened to the open surface 5, even if the stripline pattern is in the form of a T-shape as shown in FIG. Same as the case of 4a.

이와 같은 본 발명에 따른 일체형 유전체필터의 필터특성과 종래 일체형 유전체필터의 특성을 도6의 그래프로 비교해 보였다. 도6의 그래프에서 실선은 본 발명에 따른 일실시예로서 896.1MHz에서 약 20MHz를 통과대역으로 하는 유전체필터에서, 855.0MHz대에서 감쇄가 일어나도록 그 길이와 폭을 조정하여 스트립라인패턴(19)을 형성한 유전체필터의 주파수별 이득을 보인 것이고, 점선은 종래와 같이 스트립라인패턴에 의한 공진기가 형성되지 않은 유전체필터의 특성을 보이는 그래프이다.The filter characteristics of the integrated dielectric filter according to the present invention and the characteristics of the conventional integrated dielectric filter were compared with the graph of FIG. 6. In the graph of FIG. 6, the solid line is an embodiment according to the present invention. In the dielectric filter having a pass band of 896.1 MHz to about 20 MHz, the strip line pattern 19 is adjusted by adjusting the length and width so that attenuation occurs in the 855.0 MHz band. The gain of each dielectric filter having a frequency profile is shown, and the dotted line is a graph showing the characteristics of the dielectric filter in which the resonator is not formed by the stripline pattern as in the prior art.

상기 도6에 도시한 그래프와 같이 통과대역보다 높은 주파수영역에서는 종래와 별 차이가 없으나, 통과대역보다 낮은 주파수영역에서는 20dB이상의 감쇄가 일어남을 알 수 있다.As shown in the graph of FIG. 6, the frequency region higher than the pass band is not significantly different from the prior art, but it can be seen that attenuation of 20 dB or more occurs in the frequency region lower than the pass band.

이와 같이, 본 발명에 의한 일체형 유전체 필터는 통과대역보다 낮은 주파수영역에서의 감쇄비를 높힐 수 있어, 낮은 주파수영역에 인접해 있는 인접채널신호에 대한 제거비를 높힐 수 있는 효과가 있으며, 더하여 스트립라인패턴의 물리적 길이 또는 폭을 조정함에 의해서 간단하게 감쇄포인트를 조정할 수 있는 효과가 있고, 통과대역보다 낮은 주파수영역의 원하는 주파수대에서 감쇄비를 더 높힐 수 있으므로 사용자의 다양한 요구를 맞출 수 있는 우수한 효과가 있다.As described above, the integrated dielectric filter according to the present invention can increase the attenuation ratio in the frequency region lower than the pass band, thereby increasing the removal ratio for the adjacent channel signal adjacent to the low frequency region, and in addition, the stripline. By adjusting the physical length or width of the pattern, the attenuation point can be easily adjusted, and the attenuation ratio can be higher in the desired frequency band in the lower frequency band than the passband, so that an excellent effect to meet various needs of the user can be obtained. have.

그리고, 본 발명에 따른 일체형 유전체 필터는 인접채널간의 간격이 더 좁아지는 요즈음의 요구에 따라, 무선통신기기에 이용되어 선택채널보다 낮은 주파수영역에 있는 인접채널제거비를 높힐 수 있는 우수한 효과가 있는 것이다.In addition, the integrated dielectric filter according to the present invention has an excellent effect of increasing the rejection ratio of adjacent channels in a frequency region lower than that of a selected channel, which is used in a wireless communication device in accordance with the demand of the narrower interval between adjacent channels. .

Claims (3)

낮은 주파수영역에서의 감쇄비조정이 가능한 일체형 유전체필터에 있어서,An integrated dielectric filter capable of adjusting the attenuation ratio in a low frequency region, 유전체블록과,Dielectric block, 유전체블록의 전면과 후면을 관통하여 형성되며 내부면에 전극이 형성되는 복수개의 공진홀과,A plurality of resonance holes formed through the front and rear surfaces of the dielectric block and having electrodes formed therein; 상기 유전체블록의 전면을 제외한 모든 외부면에 형성되는 접지전극과,A ground electrode formed on all outer surfaces except the front surface of the dielectric block; 상기 접지전극의 일부분을 다른 부분과 단락시켜 형성한 입출력전극과,An input / output electrode formed by shorting a portion of the ground electrode with another portion; 상기 유전체블록의 전극이 형성되지 않은 개방면에 어떤 접지전극과도 연결되지 않도록 형성되는 스트립라인패턴을 구비함을 특징으로 하는 낮은 주파수영역에서의 감쇄비조정이 가능한 일체형 유전체 필터.An integrated dielectric filter capable of adjusting the attenuation ratio in the low frequency region, characterized in that it has a stripline pattern formed on the open surface of the dielectric block is not formed to be connected to any ground electrode. 제1항에 있어서,The method of claim 1, 상기 스트립라인패턴은 일자형으로 형성됨을 특징으로 하는 낮은 주파수영역에서의 감쇄비조정이 가능한 일체형 유전체 필터.The stripline pattern is a one-piece dielectric filter capable of adjusting the attenuation ratio in the low frequency region, characterized in that formed in a straight line. 제1항에 있어서,The method of claim 1, 상기 스트립라인패턴은 T자형으로 형성됨을 특징으로 하는 낮은 주파수영역에서의 감쇄비조정이 가능한 일체형 유전체 필터.The stripline pattern is formed of a T-shaped integral dielectric filter capable of adjusting the attenuation ratio in the low frequency region.
KR1019980027437A 1998-07-08 1998-07-08 One block dielectric filter KR100262498B1 (en)

Priority Applications (21)

Application Number Priority Date Filing Date Title
KR1019980027437A KR100262498B1 (en) 1998-07-08 1998-07-08 One block dielectric filter
SE9804354A SE9804354L (en) 1998-07-08 1998-12-16 Dielectric filter
US09/212,534 US6169465B1 (en) 1998-07-08 1998-12-16 Duplexer dielectric filter
SE9804353A SE9804353L (en) 1998-07-08 1998-12-16 Dielectric duplexor filter
TW087121004A TW406467B (en) 1998-07-08 1998-12-16 Dielectric filter
TW87121003A TW472444B (en) 1998-07-08 1998-12-16 A duplexer dielectric filter
AT0209998A AT411119B (en) 1998-07-08 1998-12-16 DIELECTRIC DUPLEX SYSTEM FILTER
FR9816167A FR2781085A1 (en) 1998-07-08 1998-12-17 DUPLEXER DIELECTRIC FILTER
US09/213,707 US6636132B1 (en) 1998-07-08 1998-12-17 Dielectric filter
AT0211698A AT411000B (en) 1998-07-08 1998-12-18 DIELECTRIC FILTER
GB9827959A GB2339341B (en) 1998-07-08 1998-12-18 A duplexer dielectric filter
DE1998159207 DE19859207A1 (en) 1998-07-08 1998-12-21 Small, light weight dielectric filter used in mobile communication terminal equipment with high frequency band characteristics
DE19859205A DE19859205A1 (en) 1998-07-08 1998-12-21 Dielectric filter containing dielectric blocks with conductive patterns for creating high attenuation in a band pass filter for communication systems
FR9816398A FR2781086B1 (en) 1998-07-08 1998-12-21 DIELECTRIC FILTER
GB9827893A GB2339340B (en) 1998-07-08 1998-12-21 Dielectric filter
JP10362665A JP2000049507A (en) 1998-07-08 1998-12-21 Duplexer dielectric filter
JP10364600A JP2000049504A (en) 1998-07-08 1998-12-22 Dielectric filter
CNB98126557XA CN1229892C (en) 1998-07-08 1998-12-25 Duplexer dielectric filter
CN98126703.3A CN1201428C (en) 1998-07-08 1998-12-30 Dielectric filter
BR9900051-2A BR9900051A (en) 1998-07-08 1999-01-13 Duplexing dielectric filter
BR9900178-0A BR9900178A (en) 1998-07-08 1999-01-27 Dielectric filter.

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Cited By (2)

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KR20030088993A (en) * 2002-05-15 2003-11-21 엘지이노텍 주식회사 Dielectric duplexer
KR101457014B1 (en) * 2013-02-01 2014-11-04 (주)파트론 Dielectric filter with out-range of cut off frequency attenuation pattern

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CN107658532A (en) * 2017-10-23 2018-02-02 石家庄创天电子科技有限公司 Wave filter
CN111384530A (en) * 2018-12-31 2020-07-07 深圳市大富科技股份有限公司 Dielectric filter, communication equipment, method for preparing dielectric block and dielectric filter
CN110277613B (en) * 2019-06-28 2021-12-17 武汉凡谷电子技术股份有限公司 Laminated integrated dielectric filter
CN113036325B (en) * 2021-01-26 2022-08-12 嘉兴佳利电子有限公司 Dielectric filter

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US4823098A (en) * 1988-06-14 1989-04-18 Motorola, Inc. Monolithic ceramic filter with bandstop function
JPH08228103A (en) * 1995-02-21 1996-09-03 Murata Mfg Co Ltd Dielectric filter

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20030088993A (en) * 2002-05-15 2003-11-21 엘지이노텍 주식회사 Dielectric duplexer
KR101457014B1 (en) * 2013-02-01 2014-11-04 (주)파트론 Dielectric filter with out-range of cut off frequency attenuation pattern

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