EP0947030A1 - Microwave filter - Google Patents
Microwave filterInfo
- Publication number
- EP0947030A1 EP0947030A1 EP97953630A EP97953630A EP0947030A1 EP 0947030 A1 EP0947030 A1 EP 0947030A1 EP 97953630 A EP97953630 A EP 97953630A EP 97953630 A EP97953630 A EP 97953630A EP 0947030 A1 EP0947030 A1 EP 0947030A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- substrate
- strip conductor
- strip
- arrangement according
- main surface
- 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.)
- Granted
Links
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
- H01P1/201—Filters for transverse electromagnetic waves
- H01P1/203—Strip line filters
- H01P1/20327—Electromagnetic interstage coupling
- H01P1/20336—Comb or interdigital filters
Definitions
- a stripline filter is known from EP 0373028, in which the strip conductors applied to a first surface of the substrate are opposite a metallization which is applied over the entire surface to the second surface of the substrate and which is connected to the reference potential.
- the known stripline filter is folded in order to reduce the area claimed, the metallizations carrying the reference potential abutting one another and the strip conductors in any case lying opposite a metallization carrying the reference potential.
- the object of the application has the task of specifying a stripline filter which combines a small size, a low-cost manufacture and a high quality.
- the proposed resonator arrangement with folded resonators without an intermediate reference potential plane has a shorter length of the strip conductors, a higher quality and furthermore a smaller coupling between the individual resonators compared to the known arrangement. This is due to lower field displacement losses and the fact that the folded resonators do not have a common length Ground covering are coupled, returned.
- the proposed stripline filter can be manufactured in an automated process and thus has the advantage of being inexpensive to manufacture.
- the ends of associated strip conductor sections terminate with the edge of the substrate, and the strip conductor sections are connected to form a strip conductor by a metallization which is guided around the narrow side of the substrate. This measure makes it unnecessary to make openings in the substrate.
- the ends of associated strip conductor sections are connected to a strip conductor by at least one electrically conductive through-contact.
- This measure entails arranging a strip conductor resonator independently of the edge of the substrate.
- the ends of the strip conductors are connected via a coupling element provided by an inductance or a capacitance.
- filters of various types e.g. low-pass or band-pass
- filters of various types can be implemented as far as possible with regard to the bandwidth and frequency position.
- one end of a strip conductor is connected to a conductor track that is metallized on the substrate.
- This measure means that a strip conductor and a conductor track can be produced in one operation.
- a coupling element is formed with a conductor track.
- a conductor track applied to the substrate carries a discrete coupling element.
- a hybrid filter is formed, in which a strip conductor and a coupling element are arranged on a substrate.
- filters of different types e.g. low-pass filters or band-pass filters
- a connection of the arrangement is applied to the substrate. This measure means that the arrangement can be connected easily.
- the application of the metallizations in thick-film technology or in thin-film technology to the substrate means that it can be produced in a common technology.
- FIG. 1 a and 1b show perspective representations of a stripline filter in accordance with the application
- FIG. 2a and FIG. 2b are equivalent electrical replacement circuits for the filter according to FIG. 1, valid for the ⁇ / 4 frequency
- FIG. 3 shows the attenuation curve of a filter according to FIG. 1 ,
- FIG. 4 shows a dielectric bandpass filter with bandline resonators of different lengths
- FIG. 5 shows an electrical equivalent circuit for the filter according to FIG. 4, valid for the ⁇ / 4 frequency
- FIG. 6 shows the attenuation curve of a filter according to FIGS
- FIG. 7 shows a stripline filter with vias.
- the description of an element designated and / or shown in a figure applies equally to elements of other figures identified and / or shown identically.
- the band line filter shown in FIG la and FIG Ib is formed with a dielectric substrate S, which may be given by a ceramic.
- the substrate is in particular provided by a thin, rectangular substrate plate of thickness h, in which the large surfaces lying opposite one another form a first main surface HO 1 and a second main surface HO 2.
- a plurality of parallel strip conductor sections with a width W and a distance a are arranged on the first main surface.
- the length 1 of a band conductor section is equal to a quarter of the wavelength ⁇ of the frequency of an electrical signal to be treated.
- the strip conductor sections of the first main surface are arranged in the top view of the main surface with congruent strip conductor sections.
- a strip conductor section of the first main surface and the associated congruent strip conductor section of the second main surface are electrically connected to a strip conductor by suitable means.
- a band conductor section of the second main surface connected to the band conductor section of the first main surface forms a ⁇ / 4 resonator given by a band conductor.
- the connection of the band conductor sections forms the short circuit of the ⁇ / 4 resonator to a certain extent. If the ends of the strip conductor sections terminate with the edge of the substrate, the connection is advantageously made by means of one
- Narrow side SF of the metallization carried around the substrate Another connection of associated strip conductor sections is provided by one or more vias (DK in FIG 7) at the ends of the strip conductor sections.
- the ends of the strip conductors on the second main surface are connected to the reference potential, which is also referred to as ground in specialist circles.
- the connection with the reference potential is caused by a metallization which is perpendicular to the longitudinal axis of the strip conductor and which is applied to the second main surface.
- the metallization for the reference potential is routed around the narrow side and, if appropriate, to a certain extent on the first main surface.
- the ends of the strip conductors on the first main surface are connected to one another with coupling elements.
- the coupling elements are by coupling impedances, such as. B.
- Conductor tracks LB may be applied to the substrate, which contain a receptacle for coupling elements given as discrete components, e.g. form a chip capacitor C1..C9 and / or a discrete coupling coil L1..L3 and which create an electrical connection between the ends of the strip conductor sections and the coupling elements.
- the conductor tracks can be designed such that they form the coupling elements as a so-called printed circuit.
- the ends of the outer band conductors on the first main surface are optionally connected to an input connection E or to an output connection A via coupling elements.
- the input connection and / or the output connection can be applied to the first main surface and connected to the ends of the outer strip conductors via conductor tracks.
- the strip conductor sections applied to the substrate, the metallization of the reference potential, the conductor tracks and possibly the coupling elements given as a printed circuit may be provided by metallizations M applied to the substrate using thick-film technology or thin-film technology.
- the arrangement shown in FIG. 1 forms a stripline filter.
- the strip conductor sections connected to form a strip conductor form a folded strip conductor resonator.
- the substrate of the stripline filter is specifically a hybrid filter.
- FIGS. 2a and 2b show equivalent electrical equivalent circuits from FIG. 1 valid for the ⁇ / 4 frequency.
- a band conductor resonator R is shown in the equivalent circuit as a parallel connection of a capacitance and an inductance.
- FIG. 3 shows the course of the attenuation in dB over the frequency for the bandpass filter from FIG. 1.
- FIG. 4 shows a stripline filter with resonators R1 to R4 of different lengths.
- the strip conductor sections are arranged such that their ends - regardless of their length - end with an edge of the substrate.
- the connection of associated strip conductor sections, to a certain extent causing a short circuit, is brought about by a metallization which is led around the narrow side of the substrate.
- the metallization carrying the reference potential is brought up to the strip conductor sections on the second main surface of the substrate.
- FIG. 5 shows the electrical replacement circuit of FIG. 4 that is valid for the ⁇ / 4 frequency.
- a band conductor resonator R is shown in the equivalent circuit as a parallel connection of a capacitance and an inductance.
- FIG. 6 shows the course of the attenuation in dB over the frequency for the bandpass filter from FIG. 4.
- FIG. 7 shows a stripline filter in which the connection of associated strip conductor sections is effected by means of electrically conductive through-contacts DK.
- Several vias can connect two associated strip conductor sections to form a strip conductor.
- the arrangement of the strip conductor sections can advantageously be selected independently of the position of the edge of the substrate.
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Control Of Motors That Do Not Use Commutators (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19652799A DE19652799C2 (en) | 1996-12-18 | 1996-12-18 | Microwave filter |
DE1965279 | 1996-12-18 | ||
PCT/DE1997/002924 WO1998027607A1 (en) | 1996-12-18 | 1997-12-16 | Microwave filter |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0947030A1 true EP0947030A1 (en) | 1999-10-06 |
EP0947030B1 EP0947030B1 (en) | 2003-03-05 |
Family
ID=7815220
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP97953630A Expired - Lifetime EP0947030B1 (en) | 1996-12-18 | 1997-12-16 | Microwave filter |
Country Status (5)
Country | Link |
---|---|
US (1) | US6265954B1 (en) |
EP (1) | EP0947030B1 (en) |
AT (1) | ATE233957T1 (en) |
DE (2) | DE19652799C2 (en) |
WO (1) | WO1998027607A1 (en) |
Families Citing this family (18)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20040232982A1 (en) * | 2002-07-19 | 2004-11-25 | Ikuroh Ichitsubo | RF front-end module for wireless communication devices |
US7071783B2 (en) * | 2002-07-19 | 2006-07-04 | Micro Mobio Corporation | Temperature-compensated power sensing circuit for power amplifiers |
US7493094B2 (en) * | 2005-01-19 | 2009-02-17 | Micro Mobio Corporation | Multi-mode power amplifier module for wireless communication devices |
DE10313868B4 (en) * | 2003-03-21 | 2009-11-19 | Siemens Ag | Catheter for magnetic navigation |
US20050205986A1 (en) | 2004-03-18 | 2005-09-22 | Ikuroh Ichitsubo | Module with integrated active substrate and passive substrate |
US7254371B2 (en) * | 2004-08-16 | 2007-08-07 | Micro-Mobio, Inc. | Multi-port multi-band RF switch |
US7262677B2 (en) * | 2004-10-25 | 2007-08-28 | Micro-Mobio, Inc. | Frequency filtering circuit for wireless communication devices |
US7548111B2 (en) * | 2005-01-19 | 2009-06-16 | Micro Mobio Corporation | Miniature dual band power amplifier with reserved pins |
US7084702B1 (en) * | 2005-01-19 | 2006-08-01 | Micro Mobio Corp. | Multi-band power amplifier module for wireless communication devices |
US7769355B2 (en) * | 2005-01-19 | 2010-08-03 | Micro Mobio Corporation | System-in-package wireless communication device comprising prepackaged power amplifier |
US7580687B2 (en) * | 2005-01-19 | 2009-08-25 | Micro Mobio Corporation | System-in-package wireless communication device comprising prepackaged power amplifier |
US7477108B2 (en) * | 2006-07-14 | 2009-01-13 | Micro Mobio, Inc. | Thermally distributed integrated power amplifier module |
CN101341627A (en) * | 2006-08-02 | 2009-01-07 | 株式会社村田制作所 | Filter element and method for manufacturing filter element |
US8093963B2 (en) * | 2006-12-01 | 2012-01-10 | Hitachi Metals, Ltd. | Laminated bandpass filter, high-frequency component and communications apparatus comprising them |
JP4770801B2 (en) * | 2007-06-26 | 2011-09-14 | 横河電機株式会社 | High frequency filter |
DE102008020597B4 (en) * | 2008-04-24 | 2017-11-23 | Epcos Ag | circuitry |
WO2011074105A1 (en) * | 2009-12-14 | 2011-06-23 | Nec Corporation | Resonant via structures in multilayer substrates and filters based on these via structures |
KR101295869B1 (en) * | 2009-12-21 | 2013-08-12 | 한국전자통신연구원 | Line filter formed on a plurality of insulation layers |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2648641B2 (en) | 1988-11-30 | 1994-09-09 | Thomson Hybrides | PASSIVE BAND PASS FILTER |
NO176298C (en) * | 1989-02-16 | 1995-03-08 | Oki Electric Ind Co Ltd | LC or hybrid type filters |
US5479141A (en) | 1993-03-25 | 1995-12-26 | Matsushita Electric Industrial Co., Ltd. | Laminated dielectric resonator and dielectric filter |
JPH07240611A (en) * | 1994-02-28 | 1995-09-12 | Kyocera Corp | Method for adjusting frequency of laminated resonator and filter |
DK0718906T3 (en) * | 1994-12-22 | 1999-11-01 | Siemens Matsushita Components | Micro Strip Filter |
-
1996
- 1996-12-18 DE DE19652799A patent/DE19652799C2/en not_active Expired - Fee Related
-
1997
- 1997-12-16 US US09/331,125 patent/US6265954B1/en not_active Expired - Lifetime
- 1997-12-16 AT AT97953630T patent/ATE233957T1/en active
- 1997-12-16 DE DE59709460T patent/DE59709460D1/en not_active Expired - Lifetime
- 1997-12-16 EP EP97953630A patent/EP0947030B1/en not_active Expired - Lifetime
- 1997-12-16 WO PCT/DE1997/002924 patent/WO1998027607A1/en active IP Right Grant
Non-Patent Citations (1)
Title |
---|
See references of WO9827607A1 * |
Also Published As
Publication number | Publication date |
---|---|
DE19652799C2 (en) | 1999-05-20 |
EP0947030B1 (en) | 2003-03-05 |
DE19652799A1 (en) | 1998-06-25 |
DE59709460D1 (en) | 2003-04-10 |
ATE233957T1 (en) | 2003-03-15 |
WO1998027607A1 (en) | 1998-06-25 |
US6265954B1 (en) | 2001-07-24 |
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