KR20080013579A - Band pass filter - Google Patents

Band pass filter Download PDF

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Publication number
KR20080013579A
KR20080013579A KR1020060075271A KR20060075271A KR20080013579A KR 20080013579 A KR20080013579 A KR 20080013579A KR 1020060075271 A KR1020060075271 A KR 1020060075271A KR 20060075271 A KR20060075271 A KR 20060075271A KR 20080013579 A KR20080013579 A KR 20080013579A
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South Korea
Prior art keywords
resonance circuit
frequency band
pass filter
inductor
band pass
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KR1020060075271A
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Korean (ko)
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박석윤
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삼성전자주식회사
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Priority to KR1020060075271A priority Critical patent/KR20080013579A/en
Publication of KR20080013579A publication Critical patent/KR20080013579A/en

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    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H7/00—Multiple-port networks comprising only passive electrical elements as network components
    • H03H7/01—Frequency selective two-port networks
    • H03H7/12—Bandpass or bandstop filters with adjustable bandwidth and fixed centre frequency
    • 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
    • H01P1/203—Strip line filters
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H7/00—Multiple-port networks comprising only passive electrical elements as network components
    • H03H7/01—Frequency selective two-port networks
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H7/00—Multiple-port networks comprising only passive electrical elements as network components
    • H03H7/01—Frequency selective two-port networks
    • H03H7/0153—Electrical filters; Controlling thereof
    • H03H7/0161—Bandpass filters
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H7/00—Multiple-port networks comprising only passive electrical elements as network components
    • H03H7/46—Networks for connecting several sources or loads, working on different frequencies or frequency bands, to a common load or source

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  • Filters And Equalizers (AREA)

Abstract

A band pass filter is provided to decrease a size of the BPF(Band Pass Filter) by using distributed parameters and lumped parameters to configure the BPF. A band pass filter filters an input signal and passes a predetermined target frequency band. The BPF includes a lumped parameter type resonance circuit(100) and a distributed parameter type resonance circuit(200). The lumped parameter type resonance circuit filters a first frequency band. The distributed parameter type resonance circuit filters a first frequency band, which is complementary to the first frequency band. The distributed parameter type resonance circuit passes the target frequency band. The lumped parameter type resonance circuit includes a parallel resonance circuit(110) and a series resonance circuit(120). The parallel resonance circuit includes a first inductor and a first capacitor which is parallel-connected to the first inductor. The series resonance circuit includes a second inductor and a second capacitor which is series-connected to the second inductor.

Description

대역통과필터{BAND PASS FILTER}Band Pass Filter {BAND PASS FILTER}

도 1은 본 발명의 일실시예에 의한 대역통과필터의 구성을 간략히 도시한 블럭도이고,1 is a block diagram briefly illustrating a configuration of a band pass filter according to an embodiment of the present invention.

도 2는 본 발명의 일실시예에 의한 대역통과필터의 상세한 구성을 도시한 회로도이다.2 is a circuit diagram showing a detailed configuration of a band pass filter according to an embodiment of the present invention.

* 도면의 주요 부분에 대한 부호의 설명 *Explanation of symbols on the main parts of the drawings

10 : 대역통과필터 100 : 집중정수형 공진회로부10: band pass filter 100: lumped constant resonance circuit

110 : 병렬공진회로 120 : 직렬공진회로110: parallel resonance circuit 120: series resonance circuit

130 : 주파수대역변환부 200 : 분포정수형 공진회로부130: frequency band conversion unit 200: distributed constant type resonance circuit unit

본 발명은 대역통과필터에 관한 것이다. 보다 상세하게, 본 발명은 크기가 작고 제조비용이 적은 대역통과필터에 관한 것이다.The present invention relates to a bandpass filter. More specifically, the present invention relates to a bandpass filter which is small in size and low in manufacturing cost.

대역통과필터(band pass filter)는 한정된 범위의 주파수 대역만을 통과시키는 필터이다. 인덕터(inductor)와 캐패시터(capacitor)의 조합에 의해 특정한 주파수에서 공진하는 공진기를 다단 결합하고, 공진기간의 결합계수를 조절함으로써 다 양한 통과대역폭을 갖는 대역통과필터를 제조할 수 있다.A band pass filter is a filter that passes only a limited range of frequency bands. By combining a resonator resonating at a specific frequency by a combination of an inductor and a capacitor, and adjusting a coupling coefficient of the resonance period, a band pass filter having various passbands can be manufactured.

이러한 대역통과필터는 집중정수형 또는 분포정수형 회로로 구성할 수 있다. 집중정수형 회로란, 전기적 특성이 각각 어떤 한 점 또는 소자 한 덩어리로 표현되는 회로를 말하며, 분포정수형 회로는 한 포인트가 아니라 어떤 부품, 선로 등의 구조 자체의 물리적 크기에 의해 전기적 특성이 결정되는 회로를 말한다.Such a bandpass filter may be configured as a lumped or distributed integer circuit. A lumped constant circuit is a circuit in which electrical characteristics are expressed as a single point or a mass of elements, respectively.Distributed constant circuits are circuits whose electrical characteristics are determined by the physical size of the structure itself such as a part or a line, not a point Say.

예컨대, 캐패시터나 인덕터 등의 단위소자를 말하는 것은 집중정수형 회로이고, 마이크로스트립(microstrip)과 같이 폭과 길이가 회로적 의미를 가지는 전송선류 등을 분포정수형 회로라고 부른다.For example, a unit element such as a capacitor or an inductor is a lumped constant circuit, and a transmission line flow such as a microstrip having a width and a length in a circuit sense is called a distributed constant circuit.

그런데, 종래의 대역통과필터에 있어서, 광대역용 대역통과필터를 집중정수형으로 구성하려면, 공진주파수가 광대역을 지원하는 인덕터 및 캐패시터는 흔하지 않으며, 이러한 인덕터 및 캐패시터가 있더라도 다단의 구성이 필요하였다.By the way, in the conventional band pass filter, in order to configure the broadband band pass filter in a lumped constant type, an inductor and a capacitor that support a wide band of resonant frequency are not common, and even if such an inductor and a capacitor exist, a multi-stage configuration is required.

또한, 분포정수형으로 구성하더라도, 단위소자를 필요로 하지 않으므로 제조비용은 줄일 수 있으나, 회로의 크기가 커지게 되어 공간의 손실이 생긴다는 문제점이 있었다.In addition, even if it is configured as a distribution constant type, since the unit element is not required, the manufacturing cost can be reduced, but there is a problem in that the size of the circuit becomes large, resulting in a loss of space.

따라서 본 발명의 목적은 상기 문제점을 해결하기 위한 것으로서, 분포정수 및 집중정수로 구성하여 크기가 작고 제조비용이 적은 대역통과필터를 제공하는 것을 목적으로 한다.Accordingly, an object of the present invention is to solve the above problems, and to provide a band pass filter having a small size and low manufacturing cost by configuring a distribution constant and a concentrated constant.

상기 목적을 달성하기 위하여, 입력신호를 필터링하여 소정 목표주파수대역 을 통과시키는 대역통과필터에 있어서, 제1주파수대역을 필터링하는 집중정수형 공진회로부 및 상기 제1주파수대역과 보상되어 상기 목표주파수대역을 통과시키기 위한 제2주파수대역을 필터링하는 분포정수형 공진회로부를 포함하는 것을 특징으로 하는 대역통과필터를 제공한다.In order to achieve the above object, a band pass filter for filtering an input signal to pass a predetermined target frequency band, comprising: a lumped constant resonant circuit portion for filtering a first frequency band and the first frequency band to compensate for the target frequency band Provided is a bandpass filter comprising a distributed constant resonant circuit portion for filtering the second frequency band for passing.

여기서, 상기 집중정수형 공진회로는, 제1인덕터 및 이와 병렬로 연결되는 제1캐패시터를 포함하는 병렬공진회로, 및 제2인덕터 및 이와 직렬로 연결되는 제2캐패시터를 포함하는 직렬공진회로를 포함할 수 있다.Here, the lumped constant resonance circuit may include a parallel resonant circuit including a first inductor and a first capacitor connected in parallel thereto, and a series resonant circuit including a second inductor and a second capacitor connected in series therewith. Can be.

또한, 상기 분포정수형 공진회로는, 오픈 스텁(open stub) 형태로 구성될 수 있다.In addition, the distribution constant type resonance circuit may be configured in the form of an open stub.

이하에서는 첨부도면을 참조하여 본 발명에 대해 상세히 설명한다. 도 1은 본 발명의 일실시예에 의한 대역통과필터(10)의 구성을 간략히 도시한 구성도이다.Hereinafter, the present invention will be described in detail with reference to the accompanying drawings. 1 is a block diagram schematically showing the configuration of the band pass filter 10 according to an embodiment of the present invention.

대역통과필터(10)는 한정된 범위의 주파수 대역만을 통과시키며, 집중정수형 공진회로부(100) 및 분포정수형 공진회로부(200)를 포함한다.The bandpass filter 10 passes only a limited frequency band and includes a lumped constant resonant circuit unit 100 and a distributed constant resonant circuit unit 200.

집중정수형 공진회로부(100)는 제1주파수대역을 필터링하며, 병렬공진회로(110), 직렬공진회로(120) 및 주파수대역변환부(130)를 포함한다.The lumped constant resonance circuit part 100 filters the first frequency band, and includes a parallel resonant circuit 110, a series resonant circuit 120, and a frequency band converter 130.

분포정수형 공진회로부(200)는 집중정수형 공진회로부(100)가 필터링하는 제1주파수대역과 보상되어 대역통과필터(10)가 목표한 주파수대역을 통과시키기 위한 제2주파수대역을 필터링하고, 오픈 스터브 형태로 구성된다.The distributed constant resonant circuit unit 200 compensates with the first frequency band filtered by the lumped constant resonant circuit unit 100 to filter the second frequency band for passing the target frequency band by the band pass filter 10, and an open stub. Form.

도 2는 본 발명의 일실시예에 의한 대역통과필터(10)의 상세한 구성을 도시한 회로도이다.2 is a circuit diagram showing a detailed configuration of the band pass filter 10 according to an embodiment of the present invention.

본 실시예에서 대역통과필터(10)는 3~9 GHz의 주파수 대역을 통과시키기 위한 대역통과필터(10)인 것을 일예로 하며, 각 회로소자들의 값은 도 2에 도시된 바와 같은 값을 갖는 것이 이상적이다.In this embodiment, the band pass filter 10 is an example of a band pass filter 10 for passing a frequency band of 3 ~ 9 GHz, the value of each circuit element has a value as shown in FIG. Ideally.

본 실시예의 병렬공진회로(110)는 저항(R1), 다이오드(D1) 및 캐패시터(C1)로 구성되며, 1.0 nH의 인덕턴스 값을 가진다. 병렬공진회로(110)는 6 GHZ 주파수대역에서 공진한다. 저항 R1의 일단은 전기적 신호가 입력되는 입력단에 연결된다. 캐패시터 C1 및 인덕터 L1는 병렬 연결되며, 저항 R1의 타단에 직렬 연결된다.The parallel resonant circuit 110 of the present embodiment is composed of a resistor R1, a diode D1, and a capacitor C1, and has an inductance value of 1.0 nH. The parallel resonance circuit 110 resonates in the 6 GHZ frequency band. One end of the resistor R1 is connected to an input terminal to which an electrical signal is input. Capacitor C1 and inductor L1 are connected in parallel and are connected in series with the other end of resistor R1.

본 실시예의 직렬공진회로(120)는 캐패시터(C2), 인덕터(L2) 및 저항(R2)로 구성되며, 2.0 pF의 캐패시턴스 값을 가진다. 직렬공진회로(120)는 3 GHZ 주파수대역에서 공진한다. 캐패시터 C2의 일단은 병렬공진회로(110)의 병렬 연결된 캐패시터 C1 및 인덕터 L1의 타단과 직렬 연결된다. 캐패시터 C2의 타단은 인덕터 L2의 일단과 직렬 연결된다. 인덕터 L2의 타단은 저항 R2의 일단에 직렬 연결되고, 저항 R2의 타단은 그라운드에 연결된다.The series resonant circuit 120 of the present embodiment is composed of a capacitor C2, an inductor L2, and a resistor R2, and has a capacitance value of 2.0 pF. The series resonant circuit 120 resonates in the 3 GHZ frequency band. One end of the capacitor C2 is connected in series with the other end of the capacitor C1 and the inductor L1 connected in parallel in the parallel resonant circuit 110. The other end of capacitor C2 is connected in series with one end of inductor L2. The other end of the inductor L2 is connected in series to one end of the resistor R2, and the other end of the resistor R2 is connected to ground.

본 실시예의 주파수대역변환부(130)는 캐패시터(C3)로 구현되며, 0.3 pF의 캐패시턴스 값을 가진다. 본 실시예에서 주파수대역변환부(130)의 값은 0.3~1.0 pF까지 가능하며, 값의 변환에 따라 100 MHz까지 주파수대역을 변환 가능하다.The frequency band converter 130 of the present embodiment is implemented with a capacitor C3 and has a capacitance value of 0.3 pF. In the present embodiment, the value of the frequency band converter 130 may be 0.3 to 1.0 pF, and the frequency band may be converted up to 100 MHz according to the value conversion.

본 실시예의 분포정수형 공진회로부(200)는 오픈 스터브 형식으로 구성되며, 특정 범위 내의 주파수대역을 저지하고, 그 양측을 통과시키는 대역소거필터(band elimination filter)로 작용한다. 분포정수형 공진회로부(200)는 9 GHZ 주파수대역에서 공진한다.The distributed constant resonant circuit 200 of the present embodiment is configured in an open stub type, and acts as a band elimination filter for blocking a frequency band within a specific range and passing both sides thereof. The distributed constant resonant circuit unit 200 resonates in the 9 GHZ frequency band.

본 실시예에 의하면, 이와 같이 집중정수형 공진회로부와 분포정수형 공진회로부를 조합함으로써, 삽입손실(insert loss)는 0.5dB, 정재파비(standing wave ration)는 2.3, 대역폭은 6 GHz인 대역통과필터를 얻을 수 있다.According to this embodiment, by combining the lumped constant type resonance circuit portion and the distributed constant type resonance circuit portion in this way, a bandpass filter having an insertion loss of 0.5 dB, standing wave ratio of 2.3, and a bandwidth of 6 GHz is obtained. You can get it.

이에 의하여, 대역통과필터를 분포정수 및 집중정수로 구성함으로써, 대역통과필터의 크기를 줄이고, 제조비용을 절약할 수 있다.As a result, by configuring the bandpass filter with a distribution constant and a concentrated constant, the size of the bandpass filter can be reduced and manufacturing cost can be saved.

비록 본 발명의 몇몇 실시예들이 도시되고 설명되었지만, 본 발명이 속하는 기술분야의 통상의 지식을 가진 당업자라면 본 발명의 원칙이나 정신에서 벗어나지 않으면서 본 실시예를 변형할 수 있음을 알 수 있을 것이다. 발명의 범위는 첨부된 청구항과 그 균등물에 의해 정해질 것이다.Although some embodiments of the invention have been shown and described, it will be apparent to those skilled in the art that modifications may be made to the embodiment without departing from the spirit or spirit of the invention. . It is intended that the scope of the invention be defined by the claims appended hereto and their equivalents.

상기한 바와 같이, 본 발명에 의하면, 분포정수 및 집중정수로 구성함으로써, 크기가 작고 제조비용이 적은 대역통과필터를 제공할 수 있다.As described above, according to the present invention, a bandpass filter having a small size and a low manufacturing cost can be provided by configuring the distribution constant and the concentrated constant.

Claims (3)

입력신호를 필터링하여 소정 목표주파수대역을 통과시키는 대역통과필터에 있어서,A band pass filter for filtering an input signal and passing a predetermined target frequency band, 제1주파수대역을 필터링하는 집중정수형 공진회로부; 및A lumped constant resonance circuit for filtering the first frequency band; And 상기 제1주파수대역과 보상되어 상기 목표주파수대역을 통과시키기 위한 제2주파수대역을 필터링하는 분포정수형 공진회로부를 포함하는 것을 특징으로 하는 대역통과필터.And a distribution integer resonant circuit part configured to filter the second frequency band for compensating with the first frequency band to pass the target frequency band. 제1항에 있어서,The method of claim 1, 상기 집중정수형 공진회로는,The lumped constant resonance circuit, 제1인덕터 및 이와 병렬로 연결되는 제1캐패시터를 포함하는 병렬공진회로; 및A parallel resonant circuit including a first inductor and a first capacitor connected in parallel thereto; And 제2인덕터 및 이와 직렬로 연결되는 제2캐패시터를 포함하는 직렬공진회로를 포함하는 것을 특징으로 하는 대역통과필터.And a series resonant circuit comprising a second inductor and a second capacitor connected in series with the second inductor. 제2항에 있어서,The method of claim 2, 상기 분포정수형 공진회로는, 오픈 스텁(open stub) 형태로 구성되는 것을 특징으로 하는 대역통과필터.The distributed constant type resonance circuit, the band pass filter, characterized in that configured in the form of an open stub (open stub).
KR1020060075271A 2006-08-09 2006-08-09 Band pass filter KR20080013579A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103457564A (en) * 2012-05-28 2013-12-18 联想(北京)有限公司 Quartz crystal equivalent circuit
CN110199476A (en) * 2016-12-06 2019-09-03 株式会社村田制作所 Filter apparatus, high-frequency front-end circuit and communication device

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103457564A (en) * 2012-05-28 2013-12-18 联想(北京)有限公司 Quartz crystal equivalent circuit
CN103457564B (en) * 2012-05-28 2016-04-27 联想(北京)有限公司 A kind of quartz crystal equivalent circuit
CN110199476A (en) * 2016-12-06 2019-09-03 株式会社村田制作所 Filter apparatus, high-frequency front-end circuit and communication device
CN110199476B (en) * 2016-12-06 2023-01-31 株式会社村田制作所 Filter device, high-frequency front-end circuit, and communication device

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