KR100402067B1 - A Double Mode Coupled SAW Filter - Google Patents
A Double Mode Coupled SAW Filter Download PDFInfo
- Publication number
- KR100402067B1 KR100402067B1 KR10-2001-0018205A KR20010018205A KR100402067B1 KR 100402067 B1 KR100402067 B1 KR 100402067B1 KR 20010018205 A KR20010018205 A KR 20010018205A KR 100402067 B1 KR100402067 B1 KR 100402067B1
- Authority
- KR
- South Korea
- Prior art keywords
- resonator
- frequency band
- filter
- resonator unit
- signal
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
- 238000010897 surface acoustic wave method Methods 0.000 claims abstract description 18
- 238000000034 method Methods 0.000 claims abstract description 14
- 238000004891 communication Methods 0.000 claims abstract description 3
- 239000003990 capacitor Substances 0.000 claims description 2
- 230000005540 biological transmission Effects 0.000 abstract description 3
- 230000000694 effects Effects 0.000 abstract description 2
- 230000001939 inductive effect Effects 0.000 abstract description 2
- 238000001914 filtration Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000010295 mobile communication Methods 0.000 description 2
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H9/00—Networks comprising electromechanical or electro-acoustic elements; Electromechanical resonators
- H03H9/46—Filters
- H03H9/64—Filters using surface acoustic waves
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H9/00—Networks comprising electromechanical or electro-acoustic elements; Electromechanical resonators
- H03H9/0023—Networks for transforming balanced signals into unbalanced signals and vice versa, e.g. baluns, or networks having balanced input and output
- H03H9/0028—Networks for transforming balanced signals into unbalanced signals and vice versa, e.g. baluns, or networks having balanced input and output using surface acoustic wave devices
- H03H9/0033—Networks for transforming balanced signals into unbalanced signals and vice versa, e.g. baluns, or networks having balanced input and output using surface acoustic wave devices having one acoustic track only
- H03H9/0038—Networks for transforming balanced signals into unbalanced signals and vice versa, e.g. baluns, or networks having balanced input and output using surface acoustic wave devices having one acoustic track only the balanced terminals being on the same side of the track
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H9/00—Networks comprising electromechanical or electro-acoustic elements; Electromechanical resonators
- H03H9/0023—Networks for transforming balanced signals into unbalanced signals and vice versa, e.g. baluns, or networks having balanced input and output
- H03H9/0028—Networks for transforming balanced signals into unbalanced signals and vice versa, e.g. baluns, or networks having balanced input and output using surface acoustic wave devices
- H03H9/0033—Networks for transforming balanced signals into unbalanced signals and vice versa, e.g. baluns, or networks having balanced input and output using surface acoustic wave devices having one acoustic track only
- H03H9/0042—Networks for transforming balanced signals into unbalanced signals and vice versa, e.g. baluns, or networks having balanced input and output using surface acoustic wave devices having one acoustic track only the balanced terminals being on opposite sides of the track
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H9/00—Networks comprising electromechanical or electro-acoustic elements; Electromechanical resonators
- H03H9/02—Details
- H03H9/125—Driving means, e.g. electrodes, coils
- H03H9/145—Driving means, e.g. electrodes, coils for networks using surface acoustic waves
Landscapes
- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Surface Acoustic Wave Elements And Circuit Networks Thereof (AREA)
Abstract
본 발명은 이중모드 공진기 결합형 SAW 필터(Double Mode Coupled SAW Filter)에 관한 것으로써, 통신기기의 외부 송수신 신호를 처리하고 필터링 할 수 있도록 IDT로 인가된 신호전압에 따라 표면탄성파를 발생하는 표면탄성파 필터 중 고주파 대역의 신호를 처리 필터링 하도록 제1 주파수 대역에서 공진하는 제1 공진기부와; 상기 제1 공진기부와 결합되어 저주파 대역의 신호를 처리 필터링 하도록 제2 주파수 대역(제2 주파수 대역<제1 주파수 대역)에서 공진하는 제2 공진기부로 이루어진 이중모드 공진기 결합형 표면탄성파(Double Mode Coupled SAW;이하 DMS라 칭함) 필터에 있어서, 상기 제1,2 공진기부를 연결하며 상기 제1,2 공진기부의 감쇠도가 개선되고 상기 DMS 필터의 광대역화가 유도되도록 상기 제1,2 공진기부 사이에 직렬 및/또는 병렬로 연결되어 상기 제1,2 주파수 대역과 인접한 제3 주파수 대역에서 공진하는 제3 공진기부를 더 포함하여 구성되며, 종래 DMS 필터의 광대역화를 유도하는 동시에 감쇠도를 개선할 수 있는 효과를 제공한다.BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a double mode coupled SAW filter, and a surface acoustic wave generating surface acoustic waves in accordance with a signal voltage applied to an IDT to process and filter an external transmission / reception signal of a communication device. A first resonator unit resonating in a first frequency band to process and filter a signal of a high frequency band among the filters; A double mode resonator coupled surface acoustic wave (Double Mode Coupled) comprising a second resonator unit coupled to the first resonator unit and resonating in a second frequency band (second frequency band <first frequency band) to process and filter a signal of a low frequency band. SAW (hereinafter referred to as DMS) filter, wherein the first and second resonator portions are connected to each other in series between the first and second resonator portions so that the attenuation of the first and second resonator portions is improved and the widening of the DMS filter is induced. And / or a third resonator unit connected in parallel to resonate in a third frequency band adjacent to the first and second frequency bands, and inducing widening of a conventional DMS filter and improving attenuation. Provide effect.
Description
본 발명은 이중모드 공진기 결합형 표면탄성파 필터(Double Mode Coupled SAW Filter)에 관한 것으로서, 특히 광대역에서 동작하면서 그 감쇠도가 개선되도록 고안된 DMS 필터에 관한 것이다.BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a double mode resonator coupled surface acoustic wave filter, and more particularly to a DMS filter designed to improve its attenuation while operating at a wide bandwidth.
표면탄성파 소자는 인가되는 전기신호를 파동을 가지는 기계신호로 변환하기 위하여 이용되는 소자이다. 이러한 표면탄성파 소자는 핸드폰과 같은 무선 통신기기의 사용이 나날이 증가하고 있는 요즘 상기 통신기기의 신호 송수신관의 끝단에 부착되어 외부 송수신 신호 중 필요한 신호를 추출하여 사용자에게로 전달하는 SAW(Surface Acoustic Wave) 필터로 많이 쓰이고 있다.A surface acoustic wave device is a device used to convert an applied electric signal into a mechanical signal having a wave. These surface acoustic wave devices are attached to the ends of signal transmitting and receiving pipes of mobile communication devices such as mobile phones, which are increasingly used day by day, and extract SAW (Surface Acoustic Wave) for extracting necessary signals from the external transmitting and receiving signals to users. ) It is widely used as a filter.
상기 SAW 필터 중 도 1에 도시된 바와 같이, 고주파 신호를 처리 필터링하는 제1 공진기부(1)와, 저주파 대역의 신호를 처리 필터링하는 제2 공진기부(2)가 결합되어 이루어진 이중모드 공진기 결합형 SAW 필터(Double Mode Coupled SAW Filter; 이하 DMS 필터라 칭함)는 일반적으로 이동통신 단말기용 RF SAW 필터로 많이 채택되고 있다.As shown in FIG. 1 of the SAW filter, a dual mode resonator coupling is formed by combining a first resonator unit 1 for processing and filtering a high frequency signal and a second resonator unit 2 for processing and filtering a low frequency band signal. Type SAW filters (hereinafter referred to as DMS filters) are generally adopted as RF SAW filters for mobile communication terminals.
상기 제1 공진기부(1)와 상기 제2 공진기부(2)는 각각 제1 주파수 대역과 제2 주파수 대역(제2 주파수 대역<제1 주파수 대역)에서 공진 하도록 구성된다.The first resonator unit 1 and the second resonator unit 2 are configured to resonate in a first frequency band and a second frequency band (second frequency band <first frequency band), respectively.
그러나 상기와 같이 제1,2 주파수 대역에서 공진하며 외부 송수신 신호를 처리 필터링 하는 DMS 필터의 동작 대역폭을 증가시킬 경우 그 감쇠도가 증가한다는 문제점이 있다.However, as described above, when the operating bandwidth of the DMS filter which resonates in the first and second frequency bands and filters the external transmission / reception signal is increased, the attenuation is increased.
또한, 요즘 들어 광대역에서 동작하는 동시에 감쇠도가 개선된 DMS 필터의 사용이 요구됨에 따라 그 성능의 한계가 발생한다는 문제점이 있다.In addition, these days, there is a problem that the performance limitation occurs as the use of a DMS filter with improved attenuation while operating in a wide band.
본 발명은 상기한 종래 기술의 문제점을 해결하기 위하여 안출된 것으로서, 그 목적은 광대역의 신호를 처리 필터링 할 수 동시에 신호의 감쇠도가 개선된 DMS 필터를 제공하는데 있다.SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems of the prior art, and an object thereof is to provide a DMS filter capable of processing and filtering a wideband signal and at the same time improving the attenuation of the signal.
도 1은 종래의 DMS 필터의 내부블록이 도시된 블록도,1 is a block diagram showing an internal block of a conventional DMS filter;
도 2는 본 발명에 따른 DMS 필터의 내부블록이 도시된 블록도,2 is a block diagram showing an internal block of a DMS filter according to the present invention;
도 3은 본 발명에 따른 제3 공진기부의 제1 구현예가 도시된 도,3 is a view showing a first embodiment of the third resonator unit according to the present invention;
도 4는 본 발명에 따른 제3 공진기부의 제2 구현예가 도시된 도이다.4 is a view showing a second embodiment of the third resonator unit according to the present invention.
<도면의 주요 부분에 관한 부호의 설명><Explanation of symbols on main parts of the drawings>
11,12,13 : 제1,2,3 공진기부11,12,13: 1st, 2nd, 3rd resonator part
R10,R20 : 제1,2 저항수단 I10 : IDT부R10, R20: first and second resistance means I10: IDT part
상기한 과제를 해결하기 위한 본 발명에 의한 DMS 필터는 통신기기의 외부 송수신 신호를 처리하고 필터링 할 수 있도록 IDT로 인가된 신호전압에 따라 표면탄성파를 발생하는 표면탄성파 필터 중 고주파 대역의 신호를 처리 필터링 하도록 제1 주파수 대역에서 공진하는 제1 공진기부와; 상기 제1 공진기부와 결합되어 저주파 대역의 신호를 처리 필터링 하도록 제2 주파수 대역(제2 주파수 대역<제1 주파수 대역)에서 공진하는 제2 공진기부로 이루어진 이중모드 공진기 결합형 표면탄성파(Double Mode Coupled SAW;이하 DMS라 칭함) 필터에 있어서, 상기 제1,2 공진기부를 연결하며 상기 제1,2 공진기부의 감쇠도가 개선되고 상기 DMS 필터의 광대역화가 유도되도록 상기 제1,2 공진기부 사이에 직렬 및/또는 병렬로 연결되어 상기 제1,2 주파수 대역과 인접한 제3 주파수 대역에서 공진하는 제3 공진기부를 더 포함하여 구성된다.The DMS filter according to the present invention for solving the above problems is to process the signal of the high frequency band of the surface acoustic wave filter to generate the surface acoustic wave according to the signal voltage applied to the IDT to process and filter the external transmission and reception signal of the communication device A first resonator unit resonating in a first frequency band to filter; A double mode resonator coupled surface acoustic wave (Double Mode Coupled) comprising a second resonator unit coupled to the first resonator unit and resonating in a second frequency band (second frequency band <first frequency band) to process and filter a signal of a low frequency band. SAW (hereinafter referred to as DMS) filter, wherein the first and second resonator portions are connected to each other in series between the first and second resonator portions so that the attenuation of the first and second resonator portions is improved and the widening of the DMS filter is induced. And / or a third resonator unit connected in parallel to resonate in a third frequency band adjacent to the first and second frequency bands.
이하, 본 발명의 바람직한 실시예를 첨부된 도면을 참조하여 상세히 설명한다.본 발명에 의한 DMS 필터는 도 2에 도시된 바와 같이, 제1 주파수 대역에서 공진하며 고주파 대역의 신호를 처리 필터링하는 제1 공진기부(11)와, 제2 주파수 대역에서 공진하며 저주파 대역의 신호를 처리 필터링하는 제2 공진기부(12)와, 상기 제1,2 공진기부(11, 12) 사이에 연결되어 상기 제1,2 주파수 대역과 인접한 제3 주파수 대역에서 공진하는 제3 공진기부(13)로 구성된다.Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings. As shown in FIG. 2, the DMS filter according to the present invention resonates in a first frequency band and processes and filters a signal of a high frequency band. A first resonator unit 11, a second resonator unit 12 which resonates in a second frequency band, and processes and filters a signal of a low frequency band, and is connected between the first and second resonator units 11 and 12 and And a third resonator unit 13 which resonates in a third frequency band adjacent to the first and second frequency bands.
여기서 상기 제2 주파수 대역은 제1 주파수 대역보다 낮은 주파수 대역을 가지며 상기 제3 공진기부(13)는 상기 제1,2 주파수 대역과 인접한 제3 주파수 대역에서 공진함에 따라 상기 제1,2 주파수 대역에서 공진하며 동작하는 기존 DMS 필터의 동작 대역폭을 확장시킨다.The second frequency band has a lower frequency band than the first frequency band, and the third resonator unit 13 resonates in a third frequency band adjacent to the first and second frequency bands. It extends the operating bandwidth of the existing DMS filter operating in resonance.
즉, 상기 제3 공진기부(13)는 상기 제1 공진기부(11)와 상기 제2 공진기부(12)의 사이에서 상기 제1,2 공진기부(11,12)와 연결됨으로써 상기 DMS 필터가 2가지의 공진 주파수 대역 외에도 추가의 공진 주파수 대역을 갖도록 하여 상기 DMS 필터의 광대역화를 유도한다.That is, the third resonator unit 13 is connected to the first and second resonator units 11 and 12 between the first resonator unit 11 and the second resonator unit 12 so that the DMS filter is connected. In addition to the two resonant frequency bands, an additional resonant frequency band is provided to induce widening of the DMS filter.
또한, 상기 제3 공진기부(13)는 도 3에 도시된 바와 같이 상기 제1,2 공진기부(11,12)와 직렬로 연결되는 제1 저항수단(R10)과 상기 제1 저항수단(R10)과 병렬로 연결되는 제2 저항수단(R20)으로 이루어지는 하나 이상의 1-포트 공진기로 구성되어 상기 제1,2 공진기부(11,12)와 직렬 또는 병렬로 연결된다.In addition, the third resonator unit 13 is a first resistance means (R10) and the first resistance means (R10) connected in series with the first and second resonator parts (11, 12) as shown in FIG. It is composed of one or more one-port resonator consisting of a second resistance means (R20) connected in parallel with the first and second resonator parts (11, 12) are connected in series or in parallel.
상기 제1 저항수단(R10) 및 제2 저항수단(20)은 요구하는 대역폭을 조정하기 위하여 임피던스가 조정되도록 복수개의 커패시터(C11,C21) 및 인덕터(L21)와 저항(R21)로 구성된다.The first resistance means R10 and the second resistance means 20 are composed of a plurality of capacitors C11 and C21, an inductor L21 and a resistor R21 so that the impedance is adjusted to adjust the required bandwidth.
또한, 상기 제3 공진기부는 도 4의 (a)에 도시된 바와 같은 패턴(P)을 가지는 도 4의 (b),(c),(d)에 도시된 IDT부(I10)로도 구현 가능하다. 여기서, 상기 IDT부(I10)를 도 4의 (b)에 도시된 바와 같이 상기 제1,2 공진기부(11,12)와 직렬로연결하는 경우 원래 대역폭의 상위(Upper) 대역폭이 확장되며, 도 4의 (c)에 도시된 바와 같이 병렬로 연결하는 경우 하위(Lower) 대역폭이 확장된다. 또한, 필요에 따라 원래 대역폭을 상,하위 모두 확장하고자 하는 경우 도 4의 (d)에 도시된 바와 같이 직렬/병렬로 모두 연결할 수 있다.In addition, the third resonator unit may also be implemented as an IDT unit I10 shown in FIGS. 4B, 4C, and 4D having a pattern P as shown in FIG. . Here, when the IDT unit I10 is connected in series with the first and second resonator units 11 and 12, as shown in FIG. 4B, an upper bandwidth of the original bandwidth is extended. As shown in (c) of FIG. 4, the lower bandwidth is extended when connected in parallel. In addition, if it is desired to extend the original bandwidth both up and down, as shown in Figure 4 (d) it can be connected in both serial / parallel.
여기서 상기 제3 공진기부(13)는 자체의 저역통과 또는 고역통과 특성을 이용하여 종래의 DMS 필터의 통과대역에 인접된 저지대역에 감쇠극을 부가시킴으로써 DMS 필터 자체의 형상인자(Shape Factor)의 개선을 통해 감쇠도를 개선시킨다.Here, the third resonator unit 13 adds an attenuation pole to the stop band adjacent to the pass band of the conventional DMS filter using its low pass or high pass characteristics, thereby reducing the shape factor of the shape factor of the DMS filter itself. The improvement improves the attenuation.
만일, 상기 제3 공진기부(13)가 상기 제1,2 공진기부(11,12)와 직렬로 연결될 경우 상기 제3 공진기부(13)는 상기 제1 공진기부(11)의 대역폭이 확장되도록 작용하며, 상기 제1 공진기부(11)의 감쇠도를 개선한다.If the third resonator unit 13 is connected in series with the first and second resonator units 11 and 12, the third resonator unit 13 may extend the bandwidth of the first resonator unit 11. It serves to improve the attenuation of the first resonator unit (11).
또한, 상기 제3 공진기부(13)가 상기 제1,2 공진기부(11,12)와 병렬로 연결될 경우 상기 제3 공진기부(13)는 상기 제2 공진기부(12)의 대역폭이 확장되도록 작용하며, 상기 제2 공진기부(12)의 감쇠도를 개선한다.In addition, when the third resonator unit 13 is connected in parallel with the first and second resonator units 11 and 12, the third resonator unit 13 may extend the bandwidth of the second resonator unit 12. It acts, and improves the attenuation of the second resonator portion 12.
상기와 같이 구성되는 본 발명의 DMS 필터는 추가의 공진 주파수 대역을 가지는 공진기부를 기존의 공진기부 사이에 접속하여 연결시킴으로써 종래 DMS 필터의 광대역화를 유도하는 동시에 감쇠도를 개선할 수 있는 효과가 있다.The DMS filter of the present invention configured as described above has an effect of inducing widening of a conventional DMS filter and improving attenuation by connecting a resonator unit having an additional resonant frequency band between existing resonator units. .
Claims (6)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR10-2001-0018205A KR100402067B1 (en) | 2001-04-06 | 2001-04-06 | A Double Mode Coupled SAW Filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR10-2001-0018205A KR100402067B1 (en) | 2001-04-06 | 2001-04-06 | A Double Mode Coupled SAW Filter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| KR20020078183A KR20020078183A (en) | 2002-10-18 |
| KR100402067B1 true KR100402067B1 (en) | 2003-10-17 |
Family
ID=27700024
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| KR10-2001-0018205A Expired - Fee Related KR100402067B1 (en) | 2001-04-06 | 2001-04-06 | A Double Mode Coupled SAW Filter |
Country Status (1)
| Country | Link |
|---|---|
| KR (1) | KR100402067B1 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101110564B1 (en) * | 2009-10-16 | 2012-02-15 | 이현수 | Cemented carbide rod material automatic cutting and processing device |
| KR101110563B1 (en) * | 2009-10-26 | 2012-02-15 | 이현수 | Cemented carbide rod material automatic cutting and processing device |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR950035060A (en) * | 1994-05-11 | 1995-12-30 | 무라따 야스따까 | Surface Wave Resonator Filter |
| JPH098599A (en) * | 1995-06-16 | 1997-01-10 | Toyo Commun Equip Co Ltd | Vertical coupled double mode saw filter |
| KR19980019102A (en) * | 1996-08-28 | 1998-06-05 | 무라따 미치히로 | Surface acoustic wave resonator filter |
| KR19990063740A (en) * | 1995-09-26 | 1999-07-26 | 게네비브 부 탄 | Surface Acoustic Wave Filter Using Combination of Three Elastic Paths |
-
2001
- 2001-04-06 KR KR10-2001-0018205A patent/KR100402067B1/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR950035060A (en) * | 1994-05-11 | 1995-12-30 | 무라따 야스따까 | Surface Wave Resonator Filter |
| JPH098599A (en) * | 1995-06-16 | 1997-01-10 | Toyo Commun Equip Co Ltd | Vertical coupled double mode saw filter |
| KR19990063740A (en) * | 1995-09-26 | 1999-07-26 | 게네비브 부 탄 | Surface Acoustic Wave Filter Using Combination of Three Elastic Paths |
| KR19980019102A (en) * | 1996-08-28 | 1998-06-05 | 무라따 미치히로 | Surface acoustic wave resonator filter |
Also Published As
| Publication number | Publication date |
|---|---|
| KR20020078183A (en) | 2002-10-18 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| FI93503B (en) | RF filter | |
| EP2093881B1 (en) | Elastic wave filter device | |
| US7800461B2 (en) | Antenna branching filter | |
| US7777592B2 (en) | Antenna sharing device and portable telephone | |
| WO2011061904A1 (en) | Elastic wave filter device and antenna duplexer using same | |
| JP4541853B2 (en) | Antenna duplexer and surface acoustic wave filter for antenna duplexer | |
| JP2000349591A5 (en) | ||
| JP2000349591A (en) | Branching filter using surface acoustic wave filter | |
| JP3337073B2 (en) | Surface acoustic wave device | |
| US20190149130A1 (en) | Ladder-type frequency-variable filter, multiplexer, radio-frequency front end circuit, and communication terminal | |
| KR100402067B1 (en) | A Double Mode Coupled SAW Filter | |
| JPWO2006040927A1 (en) | Duplexer | |
| JPH10322105A (en) | Branching filter | |
| JP3181158B2 (en) | Composite surface acoustic wave filter and mobile communication device using composite surface acoustic wave filter | |
| JP6677296B2 (en) | Acoustic wave filter device | |
| JP3794897B2 (en) | Wireless communication device | |
| JPWO2006040923A1 (en) | Duplexer | |
| JP3980323B2 (en) | Surface acoustic wave duplexer | |
| CN112886945A (en) | Notch filter and multi-frequency notch filter | |
| JP4004340B2 (en) | Antenna duplexer | |
| US20230283260A1 (en) | Notch filter and multi-frequency notch filter | |
| JP2003218669A (en) | Filter circuit using surface acoustic wave filter, and duplexer | |
| JP2000261269A (en) | Surface acoustic wave filter and characteristic adjustment method for surface acoustic wave | |
| JP2006180316A (en) | Surface acoustic wave filter | |
| JPH1056304A (en) | Duplexer |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A201 | Request for examination | ||
| PA0109 | Patent application |
Patent event code: PA01091R01D Comment text: Patent Application Patent event date: 20010406 |
|
| PA0201 | Request for examination | ||
| PG1501 | Laying open of application | ||
| E902 | Notification of reason for refusal | ||
| PE0902 | Notice of grounds for rejection |
Comment text: Notification of reason for refusal Patent event date: 20021223 Patent event code: PE09021S01D |
|
| E701 | Decision to grant or registration of patent right | ||
| PE0701 | Decision of registration |
Patent event code: PE07011S01D Comment text: Decision to Grant Registration Patent event date: 20030927 |
|
| GRNT | Written decision to grant | ||
| PR0701 | Registration of establishment |
Comment text: Registration of Establishment Patent event date: 20031002 Patent event code: PR07011E01D |
|
| PR1002 | Payment of registration fee |
Payment date: 20031006 End annual number: 3 Start annual number: 1 |
|
| PG1601 | Publication of registration | ||
| PR1001 | Payment of annual fee |
Payment date: 20061004 Start annual number: 4 End annual number: 4 |
|
| FPAY | Annual fee payment |
Payment date: 20071002 Year of fee payment: 5 |
|
| PR1001 | Payment of annual fee |
Payment date: 20071002 Start annual number: 5 End annual number: 5 |
|
| LAPS | Lapse due to unpaid annual fee | ||
| PC1903 | Unpaid annual fee |