WO2014038188A1 - 帯域通過フィルタ - Google Patents
帯域通過フィルタ Download PDFInfo
- Publication number
- WO2014038188A1 WO2014038188A1 PCT/JP2013/005217 JP2013005217W WO2014038188A1 WO 2014038188 A1 WO2014038188 A1 WO 2014038188A1 JP 2013005217 W JP2013005217 W JP 2013005217W WO 2014038188 A1 WO2014038188 A1 WO 2014038188A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- band
- pass filter
- coupling
- metal plate
- plate
- Prior art date
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Classifications
-
- 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
-
- 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
- H01P1/2016—Slot line filters; Fin line filters
Definitions
- the present invention relates to a fin-line bandpass filter having a wide band selection range used in a microwave band or a millimeter wave band.
- a waveguide filter is preferably used as a band-pass filter used in a microwave band or the like.
- This waveguide filter is widely used in communication equipment such as a base station because it has low loss and is excellent in high power durability capable of handling a large amount of power.
- One of the waveguide filters is a finline type bandpass filter.
- This filter is a band-pass filter composed of a rectangular waveguide divided at the center of the wide surface and a thin metal plate designed to resonate at a predetermined frequency sandwiched therebetween. Since the metal plate can be manufactured with high accuracy by etching or pressing, the characteristics can be ensured only by assembling without adjusting the characteristics with screws. Therefore, it has the feature that assembly time and inspection time can be significantly reduced.
- the feature of the fin line type bandpass filter is that the resonance frequency and the coupling coefficient are determined by the thin metal plate to be sandwiched.
- a known fin line filter cannot be used because a sufficient coupling coefficient cannot be secured in a wide bandwidth or a very high frequency band such as a millimeter wave (Patent Document 1).
- the thickness of the thin metal plate is limited in manufacturing, and it is difficult to make it thinner than a certain value. For this reason, when the size of the waveguide is reduced by application to the millimeter wave band or the like, the proportion of the metal plate is increased, and the realizable coupling coefficient is further reduced. Therefore, the fin line filter cannot be used particularly when the frequency such as the millimeter wave band is high.
- the present invention has been made in view of the above problems, and its object is to provide a rectangular waveguide divided at the center of a wide surface and a thin waveguide designed to resonate at a predetermined frequency sandwiched therebetween.
- An object of the present invention is to provide a bandpass filter having a wide bandwidth that requires a high coupling coefficient by widening the range of values of the coupling coefficient that can be realized in a fin line type bandpass filter made of a metal plate.
- a band-pass filter including a rectangular waveguide divided at the center of a wide surface and a metal plate sandwiched between the rectangular waveguides, at least one of the coupling plates provided on the metal plate is divided. This is a band pass filter.
- the fin line type bandpass filter of the present invention it is possible to widen the range of values of the coupling coefficient that can be realized, and to realize a wide bandpass filter that requires a high coupling coefficient.
- FIG. 1 is an exploded perspective view of a fin-line bandpass filter 10 according to an embodiment of the present invention
- FIG. 2 is a perspective view after assembly.
- the fin-line type bandpass filter 10 is composed of rectangular waveguides A1 and B2 divided at the center of the wide surface, and a thin metal plate 3 designed to resonate at a predetermined frequency sandwiched therebetween.
- the cut plate is the bonded plate a5
- the uncut plate is the bonded plate b6.
- FIGS. 1 and 2 only the first stage and the last stage among the coupling plates from the first stage to the last stage are cut, but other coupling boards may be cut according to the required coupling coefficient. (Description of operation) The operation when a part of the coupling plate for determining the coupling coefficient is cut will be described with a specific example.
- FIG. 3 shows an example of a fin line type band-pass filter having a known metal plate shape.
- 4A and 4B show enlarged views of a part of the metal plate of the present invention and a known fin line type bandpass filter.
- FIG. 5 shows the relationship between the ripple band and the coupling coefficient k required for the first stage.
- the coupling coefficient here is that of a Chebyshev type filter, and an example having a frequency of 73.5 GHz is given. Since the coupling coefficient required for the first stage (final stage) is the largest among the coupling coefficients that determine the bandwidth of the filter, only the relation between the ripple band and the first stage coupling coefficient is shown here. For example, in order to make a filter having a center frequency of 73.5 GHz, a stage number of 7 stages, and a ripple band of 6000 MHz, the coupling coefficient of the first stage needs to be 0.53. In order to obtain a desired characteristic, it is necessary to satisfy a required coupling coefficient, and if it deviates from that, the characteristic deteriorates. In the fin-line filter, the structure that determines the coupling coefficient is a coupling plate.
- FIG. 6 shows the relationship between the coupling plate width W and coupling coefficient k in the case of a known structure.
- the width W of the coupling plate is shown in FIG. 4B.
- the solid line in FIG. 6 is when the thickness of the metal plate is 0.1 mm, and the dotted line is when the thickness of the metal plate is 0.2 mm.
- the thinner the metal plate and the narrower the width the greater the coupling coefficient.
- the lower limit of the width of the metal plate is about the same value as the thickness due to manufacturing problems, and the thickness of the metal plate cannot be reduced anywhere due to the strength. Considering productivity such as assembly, the limit of the thickness of the metal plate is about 0.1 mm.
- the maximum value that can be taken as the coupling coefficient in this case is 0.39.
- the coupling coefficient at the first stage requires 0.53, but the conventional structure Thus, a coupling coefficient of 0.53 cannot be realized.
- the known structure only a bandpass filter with a ripple band of 3000 MHz or less can be realized.
- the known metal plate structure cannot realize a filter with a wide bandwidth, and therefore the shape of the coupling plate of the present embodiment that can increase the coupling coefficient is effective.
- FIG. 7 shows the relationship between the coupling plate spacing D and the coupling coefficient k.
- the distance D between the coupling plates is shown in FIG. 4A.
- the width W of the metal plate at this time is 1 mm.
- Increasing the distance D between the coupling plates increases the coupling coefficient.
- the coupling between the resonators is strengthened and the coupling coefficient is increased.
- the coupling plate interval D is about 0.6 mm
- the coupling coefficient is 0.53. Therefore, a band-pass filter with a ripple band of 6000 MHz that cannot be realized with a known structure can be realized.
- FIG. 8 shows the characteristics of the fin-line type bandpass filter designed using the structure of this embodiment.
- the solid line is the passage loss S21, and the dotted line is the reflection loss S11.
- This filter has a metal plate cut only at the first stage and the last stage of the coupling plate, and can obtain very good characteristics.
- the characteristics in the case where only the first stage and the last stage are cut out of the coupling plates from the first stage to the last stage are shown, but other coupling boards may be cut according to the required coupling coefficient.
- a coupling coefficient that cannot be realized by a known structure is realized, and a filter having a wide bandwidth can be realized.
- the fin-line band can be used in higher order modes such as TE102 and TE103.
- a pass filter can be configured.
- An advantage of using a higher order mode is that it is possible to create a filter with less variation with respect to dimensional deviation. Compared with TE101, the sensitivity to dimensional deviation is half when TE102 is used. However, if a higher order mode is used, the coupling coefficient required to achieve a filter with the same bandwidth is increased.
- the use of the structure of the present embodiment that can realize a larger coupling coefficient can use higher-order modes such as TE102 and T103, and can create a filter with less variation with respect to dimensional deviation.
- the need for adjusting the characteristics with screws is reduced and the cost can be reduced.
- the number of filter stages is seven, but the number of filter stages is designed according to the required passband and attenuation, and the invention It does not limit the range.
- the way of cutting the coupling plate a5 can be changed. The characteristics can be ensured even when the corners of the coupling plate a5 are rounded or the width is changed at both ends.
- FIG. 10 shows a case where the filter shape is changed.
- the present invention can be applied even when the filter is bent, and it is not always necessary to use a linear filter.
- FIG. 11 shows a duplexer including two filters and a T branch.
- the bandpass filter having the structure of the present invention can also be applied to a duplexer or a multiplexer.
- the filter shape, the position of the port 34, and the like are designed according to the interface of the apparatus, and do not limit the present invention.
- Fig. 12 shows the case where a printed circuit board is used instead of a metal plate.
- a printed circuit board By creating a coupling plate and a resonator with the metal layer pattern of the printed circuit board 43, it is possible to configure a finline type bandpass filter as in the case of the metal plate.
- the advantage of using a printed circuit board is that it can be easily connected because it can be configured on the same circuit board as an amplifier. By using a printed circuit board, conversion between a waveguide and a microstrip line can be incorporated into the printed circuit board.
- the coupling coefficient can be increased, it is possible to create a filter with a wide bandwidth even with the fin line type band pass filter, such as TE102 and TE103.
- Higher order modes can be used, so it is possible to create a filter with little variation with respect to dimensional deviation, and because there is little variation with respect to dimensional deviation, it is not necessary to adjust the characteristics with screws and the cost can be reduced.
- the resonator can be made of a single plate, the assembly time is short, and the adjustment time with screws can be reduced, so that the cost is low.
- the present invention relates to a fin line type band pass filter used in a microwave band or a millimeter wave band.
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- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Control Of Motors That Do Not Use Commutators (AREA)
Abstract
Description
(構造の説明)
図1は、本発明の実施形態のフィンライン型帯域通過フィルタ10の分解斜視図であり、図2は、その組み立て後の斜視図である。フィンライン型帯域通過フィルタ10は、幅広面中央で分割された方形導波管A1、B2と、これらによって挟み込まれた所定の周波数で共振するように設計された薄い金属板3からなる。
(動作の説明)
結合係数を決定する結合板の一部を切断した場合の動作について具体例をあげて説明する。ここでは、70~80G帯の方形導波管(3.1mm×1.55mm)を用いた7段の帯域通過フィルタを例にあげている。具体例を示すデータでは、方形導波管の伝搬モードの1つであるTE101モードを用いている。図3に既知の金属板の形状を有するフィンライン型帯域通過フィルタの例を示す。図4A、4Bに本発明と既知のフィンライン型帯域通過フィルタの金属板の一部を拡大した図を示す。
2、22、32、42 方形導波管B
3、23、33 金属板
34 ポート
4 共振器
5 結合板a
6 結合板b
10 フィンライン型帯域通過フィルタ
43 プリント基板
44 ビア
Claims (10)
- 幅広面中央で分割された方形導波管と、前記方形導波管によって挟み込まれた金属板と、により構成される帯域通過フィルタにおいて、前記金属板に設けられた結合板の少なくとも1箇所が分断されていることを特徴とする、帯域通過フィルタ。
- 前記結合板の内、前記金属板の端部に設けられた前記結合板が分断されていることを特徴とする、請求項1記載の帯域通過フィルタ。
- 前記結合板の内、前記金属板の両端部に設けられた2個の前記結合板が分断されていることを特徴とする、請求項1記載の帯域通過フィルタ。
- 前記結合板の分断された形状が、直線であることを特徴とする、請求項1乃至3の何れか1項記載の帯域通過フィルタ。
- 前記結合板の分断された形状が、曲線であることを特徴とする、請求項1乃至3の何れか1項記載の帯域通過フィルタ。
- 前記結合板の分断された形状が、階段状であることを特徴とする、請求項1乃至3の何れか1項記載の帯域通過フィルタ。
- 幅広面中央で分割された曲線導波管と、前記曲線導波管によって挟み込まれた金属板と、により構成される帯域通過フィルタにおいて、
前記金属板に設けられた結合板の少なくとも1箇所が分断されていることを特徴とする、帯域通過フィルタ。 - 前記曲線がU字形状であることを特徴とする、請求項7記載の帯域通過フィルタ。
- 互いに接続された複数のフィルタ素子を備え、該複数のフィルタ素子の各々は、請求項1乃至8の何れか1項に記載された帯域通過フィルタを備えていることを特徴とする帯域通過フィルタ。
- 前記金属板がプリント基板の金属層パタンからなることを特徴とする、請求項1乃至9の何れか1項記載の帯域通過フィルタ。
Priority Applications (8)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
MX2015002935A MX341059B (es) | 2012-09-07 | 2013-09-04 | Filtro paso banda. |
RU2015112582/28A RU2602756C2 (ru) | 2012-09-07 | 2013-09-04 | Полосовой фильтр |
US14/426,717 US20150236392A1 (en) | 2012-09-07 | 2013-09-04 | Band-pass filter |
EP13834721.6A EP2894711A4 (en) | 2012-09-07 | 2013-09-04 | PASS-BAND FILTER |
CN201380046825.0A CN104620439A (zh) | 2012-09-07 | 2013-09-04 | 带通滤波器 |
IN1746DEN2015 IN2015DN01746A (ja) | 2012-09-07 | 2015-03-03 | |
PH12015500475A PH12015500475A1 (en) | 2012-09-07 | 2015-03-04 | Band-pass filter |
ZA2015/02008A ZA201502008B (en) | 2012-09-07 | 2015-03-24 | Band-pass filter |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2012196858 | 2012-09-07 | ||
JP2012-196858 | 2012-09-07 |
Publications (1)
Publication Number | Publication Date |
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WO2014038188A1 true WO2014038188A1 (ja) | 2014-03-13 |
Family
ID=50236817
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2013/005217 WO2014038188A1 (ja) | 2012-09-07 | 2013-09-04 | 帯域通過フィルタ |
Country Status (9)
Country | Link |
---|---|
US (1) | US20150236392A1 (ja) |
EP (1) | EP2894711A4 (ja) |
CN (1) | CN104620439A (ja) |
IN (1) | IN2015DN01746A (ja) |
MX (1) | MX341059B (ja) |
PH (1) | PH12015500475A1 (ja) |
RU (1) | RU2602756C2 (ja) |
WO (1) | WO2014038188A1 (ja) |
ZA (1) | ZA201502008B (ja) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN104362416A (zh) * | 2014-11-28 | 2015-02-18 | 电子科技大学 | 椭圆孔截断金属膜片及其构成的e面波导滤波器 |
CN104409814A (zh) * | 2014-11-28 | 2015-03-11 | 电子科技大学 | 截断金属膜片及其构成的e面波导带通滤波器 |
JP2016119531A (ja) * | 2014-12-19 | 2016-06-30 | Necエンジニアリング株式会社 | チューナブルエバネセントモード帯域通過フィルタ |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
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DK3266062T3 (en) * | 2015-03-01 | 2018-11-26 | Ericsson Telefon Ab L M | Waveguide E-plane-FILTER |
US9947980B2 (en) * | 2016-01-14 | 2018-04-17 | Northrop Grumman Systems Corporation | Terahertz filter tuning |
CN106785274B (zh) * | 2017-01-17 | 2020-11-24 | 华南理工大学 | 一种基于三层金属板结构的带通滤波器 |
US10305440B2 (en) * | 2017-05-05 | 2019-05-28 | Zte Corporation | Bent E-plane all metal septum filters for wireless communication system |
CN111786069B (zh) | 2019-04-04 | 2021-09-21 | 上海诺基亚贝尔股份有限公司 | 谐振器和滤波器 |
CN112713371B (zh) * | 2020-12-10 | 2022-03-04 | 北京无线电测量研究所 | 一种波导滤波器及其使用方法 |
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2013
- 2013-09-04 RU RU2015112582/28A patent/RU2602756C2/ru not_active IP Right Cessation
- 2013-09-04 CN CN201380046825.0A patent/CN104620439A/zh active Pending
- 2013-09-04 WO PCT/JP2013/005217 patent/WO2014038188A1/ja active Application Filing
- 2013-09-04 US US14/426,717 patent/US20150236392A1/en not_active Abandoned
- 2013-09-04 EP EP13834721.6A patent/EP2894711A4/en not_active Withdrawn
- 2013-09-04 MX MX2015002935A patent/MX341059B/es active IP Right Grant
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2015
- 2015-03-03 IN IN1746DEN2015 patent/IN2015DN01746A/en unknown
- 2015-03-04 PH PH12015500475A patent/PH12015500475A1/en unknown
- 2015-03-24 ZA ZA2015/02008A patent/ZA201502008B/en unknown
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Cited By (4)
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---|---|---|---|---|
CN104362416A (zh) * | 2014-11-28 | 2015-02-18 | 电子科技大学 | 椭圆孔截断金属膜片及其构成的e面波导滤波器 |
CN104409814A (zh) * | 2014-11-28 | 2015-03-11 | 电子科技大学 | 截断金属膜片及其构成的e面波导带通滤波器 |
CN104409814B (zh) * | 2014-11-28 | 2017-06-06 | 电子科技大学 | 截断金属膜片及其构成的e面波导带通滤波器 |
JP2016119531A (ja) * | 2014-12-19 | 2016-06-30 | Necエンジニアリング株式会社 | チューナブルエバネセントモード帯域通過フィルタ |
Also Published As
Publication number | Publication date |
---|---|
MX341059B (es) | 2016-08-05 |
RU2015112582A (ru) | 2016-10-27 |
EP2894711A4 (en) | 2016-04-20 |
US20150236392A1 (en) | 2015-08-20 |
EP2894711A1 (en) | 2015-07-15 |
MX2015002935A (es) | 2015-06-05 |
IN2015DN01746A (ja) | 2015-05-29 |
CN104620439A (zh) | 2015-05-13 |
RU2602756C2 (ru) | 2016-11-20 |
ZA201502008B (en) | 2016-10-26 |
PH12015500475A1 (en) | 2015-04-20 |
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