EP0318478B1 - Filter, bestehend aus einer einbaubaren einheit mit mehreren resonatoren - Google Patents

Filter, bestehend aus einer einbaubaren einheit mit mehreren resonatoren Download PDF

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Publication number
EP0318478B1
EP0318478B1 EP87903794A EP87903794A EP0318478B1 EP 0318478 B1 EP0318478 B1 EP 0318478B1 EP 87903794 A EP87903794 A EP 87903794A EP 87903794 A EP87903794 A EP 87903794A EP 0318478 B1 EP0318478 B1 EP 0318478B1
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EP
European Patent Office
Prior art keywords
filter
resonator
dielectric
resonators
conductive material
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 - Lifetime
Application number
EP87903794A
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English (en)
French (fr)
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EP0318478A4 (de
EP0318478A1 (de
Inventor
Michael F. Moutrie
Raymond L. Sokola
Phillip J. Gordon
Steven R. Green
David M. Demuro
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Motorola Solutions Inc
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Motorola Inc
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Filing date
Publication date
Priority claimed from US06/890,682 external-priority patent/US4716391A/en
Priority claimed from US06/890,686 external-priority patent/US4692726A/en
Application filed by Motorola Inc filed Critical Motorola Inc
Publication of EP0318478A1 publication Critical patent/EP0318478A1/de
Publication of EP0318478A4 publication Critical patent/EP0318478A4/de
Application granted granted Critical
Publication of EP0318478B1 publication Critical patent/EP0318478B1/de
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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
    • H01P1/213—Frequency-selective devices, e.g. filters combining or separating two or more different frequencies
    • H01P1/2136—Frequency-selective devices, e.g. filters combining or separating two or more different frequencies using comb or interdigital filters; using cascaded coaxial cavities

Definitions

  • the present invention is related generally to radio frequency (RF) filters, and more particularly to a dielectric band pass filter having an improved capacitive inter-resonator coupling via metalization and an improved mounting apparatus, producing a filter that is particularly well adapted for use in mobile and portable radio transmitting and receiving devices.
  • RF radio frequency
  • Japanese patent application JP 60-254802 describes a distributed constant type filter having electrodes connected electrically to internal conductors of resonance units formed in an open end surface of a dielectric block, whereby the resonance units are coupled mutually through electrostatic capacity.
  • a dielectric filter for passing a band of radio frequencies and rejecting other bands of frequencies, having a volume of dielectric material having first, second, and side surfaces, said second and side surfaces being substantially covered with a conductive material; a plurality of holes extending through said dielectric material from said first surface to said second surface, the surface of at least two of said holes being substantially covered with a conductive material which is electrically common at said second surface, thereby forming at least two resonators; characterised by: first electrode means disposed on said first surface, connected to said conductive material of said side surface, and extending partially between a first surface hole of a first resonator of said at least two resonators and a first surface hole of a second resonator of said at least two resonators, whereby coupling between said first resonator and said second resonator may be limited.
  • the present invention advantageously provides a dielectric filter having an improved capacitive coupling. Furthermore, the present invention enables the dielectric filter to have its filter characteristics modified by changing metalization coupling resonators therein. In addition, the present invention allows the coupling of such filters in a configuration that enables their performance as a radio transceiver duplexer.
  • a further benefit derived through the implementation of the invention is that the dielectric filter may be mounted and connected to a printed circuit board or other substrate element in a manner similar to other electrical components.
  • Figure 1 is a perspective view of a conventional dielectric filter illustrating the orientation of the resonator elements and the input/output coupling.
  • Figures 2, 3 and 4 are sectional views of Figure 1 illustrating metalization patterns which may be employed in the resonator holes.
  • Figure 5 is a bottom perspective view of a dielectric block filter and mounting bracket employing the present invention.
  • Figure 6 is a sectional view illustrating an input or output terminal employed in the present invention.
  • Figure 7 is a dimensional diagram of the mounting bracket employed in the present invention.
  • Figure 8 is a dimensional view of a printed circuit board mounted duplexer employing component-mountable filters.
  • Figure 9 is a schematic diagram of a component-mountable filter.
  • Figure 10 is a schematic diagram of the duplexer of Figure 8.
  • Figure 11 is a schematic diagram of a printed circuit mounted duplexer employing component-mountable filters in a diversity receive antenna configuration.
  • Figure 12A, 12B, 12C, 12D, and 12E illustrate metalization patterns which may be employed in the present invention.
  • Filter 100 includes a block 105 which is comprised of a dielectric material that is selectively plated with a conductive material.
  • Filter 100 is generally constructed of a suitable dielectric material such as a ceramic material which has low loss, a high dielectric constant, and a low temperature coefficient of the dielectric constant.
  • filter 100 is comprised of a ceramic compound including barium oxide, titanium oxide and ziconium oxide, the electrical characteristics of which are similar to those described in more detail in an article by G.H. Jonker and W. Kwestroo, entitled “The Ternery Systems BaO-TiO2-ZrO2", Published in the Journal of the American Ceramic Society, Volume 41, no. 10 at pages 390-394, October, 1958.
  • the compound in table VI having the composition 18.5 mole percent BaO, 77.0 mole percent TiO2 and 4.5 mole percent ZrO2 and having a dielectric constant of approximately 40 is well suited for use in the ceramic of the present invention.
  • a dielectric filter such as that of block 105 of Filter 100 is generally covered or plated, with the exception of areas 107, with an electrically conductive material such as copper or silver.
  • a filter such as block 105 includes a multitude of holes 109 which each extend from the top surface to the bottom surface thereof and are likewise plated with an electrically conductive material. The plating of the holes 109 is electrically common with the conductive plating covering the block 105 at one end of the holes 109 and isolated from the plating covering the block 105 at the opposite end of the holes 109. Further, the plating of holes 109 at the isolated end may extend onto the top surface of block 105.
  • each of the plated holes 109 is essentially a foreshortened coaxial resonator comprised of a short coaxial transmission line having a length selected for desired filter response characteristics.
  • the block 105 is shown in Fig. 1 with six plated holes, any number of plated holes may be utilized depending upon the filter response characteristics desired).
  • Conductive plating 204 on dielectric material 202 extends through hole 201 to the top surface with the exception of a circular portion 240 around hole 201.
  • Other conductive plating arrangements may also be utilized, two of which are illustrated in Figures 3 and 4.
  • conductive plating 304 on dielectric material 302 extends through hole 301 to the bottom surface with the exception of portion 340.
  • the plating arrangement in Fig. 3 is substantially identical to that in Fig. 2, the difference being that unplated portion 340 is on the bottom surface instead of on the top surface.
  • conductive plating 404 on dielectric material 402 extends partially through hole 401 leaving part of hole 401 unplated.
  • the plating arrangement in Fig. 4 can also be reversed as in Fig. 3 so that the unplated portion 440 is on the bottom surface.
  • Coupling between the plated hole resonators is accomplished through the dielectric material and may be varied by varying the width of the dielectric material and the distance between adjacent coaxial resonators.
  • the width of the dielectric material between adjacent holes 109 can be adjusted in any suitable regular or irregular manner, such as, for example, by the use of slots, cylindrical holes, square or rectangular holes, or irregularly shaped holes.
  • RF signals are capacitively coupled to and from the dielectric filter 100 by means of input and output electrodes 111 and 113, respectively, which, in turn, are coupled to input and output connectors 101 and 103, respectively.
  • the resonant frequency of the coaxial resonators provided by plated holes 109 is determined primarily by the depth of the hole, thickness of the dielectric block in the direction of the hole, and the amount of plating removed from the top of the filter near the hole.
  • Tuning of filter 100 may be accomplished by the removal of additional ground plating or resonator plating extending upon the top surface of the block 105 near the top of each plated hole.
  • the removal of plating for tuning the filter can easily be automated, and can be accomplished by means of a laser, sandblast trimmer, or other suitable trimming devices while monitoring the return loss angle of the filter.
  • a dielectric filter employing the present invention is shown in a exploded perspective view.
  • a block of dielectric material 501 is placed in a carrying bracket 503 which performs the multiple functions of providing a rigid mounting platform such that dielectric block 501 may be inserted into a printed circuit board or other substrate, providing simplified input and output connections via feed through terminals 505 and 507, and providing positive ground contact between the conductive outer surface of dielectric block 501 and bracket 503 via contacts 509, 510, 511, 512, and other contacts not shown.
  • Contacts 509 and 510 additionally provide a dielectric block 501 locating function within the bracket 503.
  • Mounting bracket 503 further provides mounting tabs 515-525 to locate and support the bracket and filter on a mounting substrate and provide positive ground contact for radio frequency signals from the mounting bracket 503 to the receiving mounting substrate.
  • a mounting bracket for a dielectric filter has been disclosed in U.S. Patent Application No. 656,121, "Single-Block Dual-Passband Ceramic Filter", filed in behalf of Gayrusch on September 27, 1984 and assigned to the assignee of the present invention. This previously disclosed bracket, however, does not provide the simplified mounting of the bracket of the present invention.
  • the dielectric filter 501 consists of a ceramic material and utilizes seven internally plated holes as foreshortened resonators to produce a band pass filter for operation in radio bands reserved for cellular mobile telephone.
  • the conductive plating covering the ceramic block 501 extends conformally on all surfaces except that on which the resonator plating is wrapped from the holes onto the outer surface.
  • holes 529-535 have corresponding plating 537-543 metallized on the outer surface of block 501. These areas 537-543 are electrically separate from the ground plating but provide capacitive coupling to the ground plating.
  • an input plated area 547 and an output plated area 549 provide capacitive coupling between the input terminal 505 and the coaxial resonator formed from the internally plated hole 529 and its externally plated area 537 while plated area 549 provides capacitive coupling between the output terminal 507 and the output resonator formed from plated hole 535 and external plated area 543.
  • Ground stripes 553-558 are plated between the coaxial resonator plated holes in order that inter-resonator coupling is adjusted.
  • Ceramic block 501 is inserted into bracket 503 with the externally plated resonator areas 537-543 oriented downward into the bracket 503 such that additional shielding is afforded by the bracket 503.
  • Input mounting pin 505 is connected to plated area 547 and output terminal 507 is connected to plated area 549 as shown in Fig. 6.
  • the center conductor 605 is brought into contact with plated area 547 by the dimensions of the bracket 503 and the block 501.
  • the center conductor 605 is soldered or otherwise conductively bonded at one end to area 547 to provide a reliable RF connection to plated area 547.
  • the other end of the center conductor 605 may then be easily soldered or plugged into a substrate which holds the mounting bracket 503.
  • a similar construction is employed for output terminal 507 and its associated plated area 549.
  • a detail of the mounting bracket 503 is shown in Fig. 7.
  • the spacing of the mounting tabs 515-525 is shown in detail for the preferred embodiment. These spacings are important at the frequencies of operation of this filter in order to maintain maximum ultimate attenuation.
  • Low ground path inductance in the mounting bracket is realized by placing mounting tabs 517 and 519 close to the input and output ports (505 and 507 of Fig. 5 respectively) and the remainder of the tabs above the side and bottom of the bracket 503.
  • Connection between the dielectric block 501 and bracket 503 is assured near the input and output terminals by contacts similar to contacts 511 and 512 located close to the terminals. All contacts, 509, 510, 511, and 512 (and the equivalent contacts on the opposite side of the brackets not shown), may be soldered or otherwise bonded to the dielectric block 501 such that electrical connection may be permanently assured.
  • the position of the tabs 518, 520, and 521 are asymmetrical.
  • the input/output terminals 505 and 507 are offset from the centerline of the bracket 503. This asymmetry enables a "keying" of the bracket 503 so that a filter can be inserted in a printed circuit board or other substrate in only one orientation.
  • a dielectric filter block such as block 501 is mounted in bracket 503 and becomes a unitized circuit component which may be inserted into a printed circuit board or substrate 801.
  • Appropriate holes 803 and 805 are located on the printed circuit board 801 to accept the input and output terminals 505 and 507 (not shown in Fig.8), respectively.
  • appropriately located slots 815-825 are located in the printed circuit board 801 to accept the corresponding tabs of the bracket 503.
  • the filter 501 and bracket 503 may be mounted on a circuit board 801 like any other component and circuit runners may extend from the input hole 803 and the output hole 805 such that the filter may be electrically connected to other circuitry with a minimum of effort.
  • the circuit board runners, 807 and 809 may be constructed as stripline or microstrip transmission lines to yield improved duplexer performance.
  • FIG. 9 there is illustrated an equivalent circuit diagram for the dielectric filter 501 utilized as a band pass filter.
  • An input signal from a signal source may be applied via terminal 505 to input electrode 547 in Fig. 5, which corresponds to the common junction of capacitors 924 and 944 in Fig. 9.
  • Capacitor 944 is the capacitance between electrode 547 and the surrounding ground plating
  • capacitor 924 is the capacitance between electrode 547 and the coaxial resonator provided by plated hole 529 in Fig. 5.
  • the coaxial resonators provided by plated 529-535 in Fig. 5 correspond to shorted transmission lines 929-935 in Fig. 9.
  • Capacitor 925 represents the capacitance between the resonator provided by plated hole 535 and electrode 549 in Fig. 5
  • capacitor 945 represents the capacitance between electrode 549 and the surrounding ground plating.
  • An output signal is provided at the junction of capacitors 925 and 945, and coupled to output terminal 547 for utilization by external circuitry.
  • a multi-band filter comprised of two intercoupled dielectric band pass filters 1004 and 1012 and employing the present invention.
  • Two or more of the inventive band pass filters may be intercoupled on a printed circuit board or substrate to provide apparatus that combines and/or frequency sorts two RF signals into and/or from a composite RF signal.
  • the present invention is employed in the arrangement of Fig. 10 which couples a transmit signal from an RF transmitter 1002 to an antenna 1008 and a receive signal from antenna 1008 to an RF receiver 1014.
  • the arrangement in Fig. 10 can be advantageously utilized in mobile, portable, and fixed station radios as an antenna duplexer.
  • the transmit signal from RF transmitter 1002 is coupled to filter 1004 by a transmission line 1005, realized by the plated runner 807 of Fig. 8 on the printed circuit board in the preferred embodiment, and the filtered transmit signal is coupled via circuit board runner transmission line 1006 (runner 809 of Fig. 8) to antenna 1008.
  • Filter 1004 is a ceramic band pass filter of the present invention, such as the filter illustrated in Figs. 5 and 8.
  • the pass band of filter 1004 is centered about the frequency of the transmit signal from RF transmitter 1002, while at the same time greatly attenuating the frequency of the received signal.
  • the length of transmission line 1006 is selected to maximize its impedance at the frequency of the received signal.
  • a received signal from antenna 1008 in Fig. 10 is coupled by transmission line 1010, also realized as a printed circuit board runner, to filter 1012 and thence via circuit board runner transmission line 1013 to RF receiver 1014.
  • Filter 1012 which also may be one of the inventive band pass filters illustrated in Figs. 5 and 8, has a pass band centered about the frequency of the receive signal, while at the same time greatly attenuating the transmit signal.
  • the length of transmission line 1010 is selected to maximize its impedance at the transmit signal frequency for further attenuating the transmit signal.
  • the dielectric band pass filters 1004 and 1012 utilize a dielectric of ceramic and are constructed in accordance with the present invention as shown in Fig. 5.
  • the filters 1004 and 1012 each have a length of 7.6 cm and a width of 1.14 cm.
  • the height is a primary determinant of the frequency of operation and, in the preferred embodiment, is 1.24 cm in the transmit filter 1004 and 1.12 cm in the receive filter 1012.
  • Filter 1004 has an insertion loss of 2.5 dB and attenuate receive signals by at least 50 dB.
  • Filter 1012 has an insertion loss of 3.0 dB and attenuates receive signals by at least 60 dB.
  • An alternative interconnection of the circuit board monostable dielectric block filters is shown in Fig. 11.
  • the antenna receiving the best signal may be switchably coupled to the receiver and provide the well-known antenna diversity function.
  • the separate transmit and receive filters 1004 and 1012 may be coupled by 180° reflection coefficient transmission lines 1107 and 1109 in a fashion to provide a diversity receive function.
  • the filter operational characteristics may be determined by the metallization pattern employed on the surface of the dielectric block which is not fully metallized.
  • Dielectric filters such as described herein are instrinsically coupled by inductance. That is, the magnetic fields in the dielectric material govern the coupling.
  • the inductance may be changed, and even overcome, by introducing capacitive between the resonators. Referring again to Fig. 5, it can be seen that a seven pole configuration is realized by serially coupling the resonators created by the metallized holes 529-535 and surface plating 539-543. As shown, the capacitive coupling between the resonators is restricted by the grounded strip electrodes 554-557.
  • a controlled capacitive coupling may be achieved by providing incomplete strip electrodes running on the surface of the dielectric block between two resonators.
  • incomplete strip electrodes 553 and 558 between input resonator and output resonator and the other resonators, provide a controlled capacitive coupling to enable combined inductive and capacitive coupling between adjacent resonators.
  • the use of inductive or capacitive coupling provides steeper filter attenuation skirts on either the high side of the filter passband or the low side of the filter passband, respectively.
  • the dielectric filter blocks are combined as a duplexer filter as shown diagrammatically in Fig. 10, it is advantageous to employ a filter having a step attenuation skirt above the passband as the filter passing the lower frequencies. Also it is advantageous to employ a filter having a steep attenuation skirt below the passband as the filter passing the higher frequencies. In this way, additional protection of transmit and receive paths from each other can be realized without additional filter resonator elements.
  • An advantage of the dielectric filter blocks of the present invention is that the number and spacing of resonators used in the transmitter filter 1004 (of Fig. 10) may be equal to the number and spacing of the resonators in the receive filter 1012.
  • the type of coupling is determined by the metalization pattern employed.
  • the transmit filter 1004 utilizes inductive coupling between resonators as illustrated in the metalization pattern of Fig. 12A.
  • the capacitive coupling between the middle resonators is reduced by the complete strip electrodes while the input and output resonators utilize more capacitance in the incomplete strip electrodes in their coupling to the middle resonators.
  • the receive filter 1012 utilizes capacitive coupling between resonators as illustrated in the metalization pattern of Fig. 12B. Capacitive coupling is enabled by the unblocked metalized resonators. (Capacitive coupling may be enhanced by metalization islands such as shown in Fig. 12C).
  • a novel feature of the present invention creates the ability of the coupling to be changed by changing the metalization. Additionally, the mode of resonator operation may be changed from band pass to band stop by utilizing one or more resonators as a transmission zero rather than as a transmission pole. Transmission zero realization by metalization change only is shown in Fig. 12D.
  • the output electrode 1203 is coupled to the first transmission pole resonator 1205 by metalization runner 1207. Coupling is also realized from output electrode 1203 to transmission zero resonator 1209. In the embodiment shown, the transmission zero is tuned to the low side of the passband to realize additional rejection on the low side of the passband.
  • a filter utilizing metalization such as that shown in Fig. 12D would be suitable for use in a duplexer such as described above.
  • Additional zeros may be created by proper coupling to other resonators. Such coupling is shown in the metalization of Fig. 12E.
  • a printed circuit board mountable, multiple resonator dielectric filter has been shown and described.
  • This filter utilizes metalized hole resonators having coupling characteristics determined by the metalization pattern on one surface of the dielectric block.
  • the dielectric block is metalized with a conductive material on all but one surface from which the hole resonators extend into the dielectric block. Electrode metalization around the holes provides capacitive coupling to this conductive material and from one resonator to an adjacent resonator. Capacitive coupling between the resonators is controlled by an electrode at least partially between two adjacent hole resonators to adjust the capacitive coupling between the resonators. Input and output coupling is accomplished via terminals asymmetrically arranged in a mounting bracket.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Control Of Motors That Do Not Use Commutators (AREA)
  • Piezo-Electric Or Mechanical Vibrators, Or Delay Or Filter Circuits (AREA)
  • Oscillators With Electromechanical Resonators (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
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Claims (7)

  1. Dielektrisches Filter, das ein Band von Funkfrequenzen passieren läßt und andere Frequenzbänder abweist, mit einem Block aus dielektrischem Material (501) mit einer ersten, zweiten und einer Seitenoberfläche, wobei die zweite und die Seitenoberfläche im wesentlichen mit einem leitfähigen Material bedeckt sind; eine Mehrzahl von Löchern (529-535), die sich durch das dielektrische Material (501) von der ersten Oberfläche zu der zweiten Oberfläche erstrecken, wobei die Oberfläche von wenigstens zwei der Löcher im wesentlichen mit einem leitfähigen Material bedeckt ist, das an der zweiten Oberfläche elektrisch geerdet ist, um dadurch wenigstens zwei Resonatoren zu bilden, gekennzeichnet durch:
    eine auf der ersten Oberfläche angeordnete erste Elektrodeneinrichtung (553), die mit dem leitfähigen Material der Seitenoberfläche verbunden ist und sich teilweise zwischen einem ersten Oberflächenloch eines ersten Resonators (529) der wenigstens zwei Resonatoren und einem ersten Oberflächenloch eines zweiten Resonators (530) der wenigstens zwei Resonatoren erstreckt, wodurch die Kopplung zwischen dem ersten Resonator (529) und dem zweiten Resonator (530) begrenzt werden kann.
  2. Dielektrisches Filter nach Anspruch 1, bei dem die erste Elektrodeneinrichtung (553) weiter zwei Streifen aus leitfähigem Material umfaßt, die im wesentlichen senkrecht zu einer zwischen dem ersten Oberflächenloch des ersten Resonators (529) und dem ersten Oberflächenloch des zweiten Resonators (530) gezogenen Linie angeordnet sind, wobei die zwei leitfähigen Streifen ein erstes Ende und ein zweites Ende besitzen, einen Zwischenraum zwischen dem ersten Ende von jedem leitfähigen Streifen, und das zweite Ende von jedem leitfähigen Streifen mit dem leitfähigen Material der Seitenoberfläche verbunden ist.
  3. Dielektrisches Filter nach Anspruch 1 oder 2, umfassend eine erste und zweite kapazitive Einrichtung (937, 938), die je eine zweite Elektrodeneinrichtung (537, 538) enthalten, die mit den ersten Oberflächenlöchern des ersten und zweiten der wenigstens zwei Resonatoren (529, 530) verbunden ist und diese im wesentlichen umgibt, um den ersten Resonator (529) kapazitiv mit dem zweiten Resonator (530) zu koppeln und den ersten und zweiten Resonator (529, 530) kapazitiv mit dem leitfähigen Material auf der Seitenoberfläche des Blocks aus dielektrischem Material zu koppeln.
  4. Dielektrisches Filter nach Anspruch 1, 2 oder 3, weiter umfassend eine dritte Elektrode (547), die auf der ersten Oberfläche des Blocks aus dielektrischem Material nahe bei und mit dem ersten Resonator (529) gekoppelt angeordnet ist, und worin die dritte Elektrode einen leitfähigen Materialteil der ersten Oberfläche des Blocks aus dielektrischem Material einschließt.
  5. Dielektrisches Filter nach einem der vorangehenden Ansprüche, weiter umfassend einen von einem dritten Loch der Mehrzahl von Löchern gebildeten dritten Resonator (535), wobei die Oberfläche des dritten Lochs im wesentlichen mit einem leitfähigen Material bedeckt ist, das an der zweiten Oberfläche elektrisch geerdet ist.
  6. Dielektrisches Filter nach Anspruch 5, weiter umfassend eine dritte kapazitive Einrichtung mit einer zweiten Elektrodeneinrichtung (543), die mit dem ersten Oberflächenloch des dritten Resonators (535) gekoppelt ist und dieses im wesentlichen umgibt, um den dritten Resonator (535) kapazitiv mit dem leitfähigen Material auf der Seitenoberfläche des Blocks aus dielektrischem Material zu koppeln.
  7. Dielektrisches Filter nach Anspruch 6, weiter umfassend eine vierte Elektrode (549), die auf der ersten Oberfläche des Blocks aus dielektrischem Material nahe bei und mit dem dritten Resonator gekoppelt angeordnet ist, und worin die vierte Elektrode (549) einen leitfähigen Materialteil der ersten Oberfläche des Blocks aus dielektrischem Material einschließt.
EP87903794A 1986-07-25 1987-05-27 Filter, bestehend aus einer einbaubaren einheit mit mehreren resonatoren Expired - Lifetime EP0318478B1 (de)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
US890682 1986-07-25
US06/890,682 US4716391A (en) 1986-07-25 1986-07-25 Multiple resonator component-mountable filter
US06/890,686 US4692726A (en) 1986-07-25 1986-07-25 Multiple resonator dielectric filter
PCT/US1987/001210 WO1988001104A1 (en) 1986-07-25 1987-05-27 Multiple resonator component-mountable filter
US890686 2010-09-26

Publications (3)

Publication Number Publication Date
EP0318478A1 EP0318478A1 (de) 1989-06-07
EP0318478A4 EP0318478A4 (de) 1989-11-20
EP0318478B1 true EP0318478B1 (de) 1995-02-15

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EP87903794A Expired - Lifetime EP0318478B1 (de) 1986-07-25 1987-05-27 Filter, bestehend aus einer einbaubaren einheit mit mehreren resonatoren

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EP (1) EP0318478B1 (de)
JP (1) JP2764903B2 (de)
CN (1) CN1011102B (de)
AT (1) ATE118653T1 (de)
CA (1) CA1277729C (de)
DE (1) DE3751062T2 (de)
DK (1) DK64488A (de)
FI (1) FI890243A0 (de)
NO (1) NO173413C (de)
WO (1) WO1988001104A1 (de)

Families Citing this family (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DK87157C (da) * 1955-11-16 1959-04-13 Kristian Jacobsen Hængsel.
FR2610662B1 (fr) * 1986-12-27 1990-07-06 Scharwaechter Gmbh Co Kg Charniere de porte decrochable
US5103197A (en) * 1989-06-09 1992-04-07 Lk-Products Oy Ceramic band-pass filter
JPH0338101A (ja) * 1989-07-04 1991-02-19 Murata Mfg Co Ltd 高周波同軸共振器
GB2236432B (en) * 1989-09-30 1994-06-29 Kyocera Corp Dielectric filter
US5045824A (en) * 1990-09-04 1991-09-03 Motorola, Inc. Dielectric filter construction
GB2263363B (en) * 1992-01-07 1996-05-08 Marconi Gec Ltd Electrical filter
US5405107A (en) * 1992-09-10 1995-04-11 Bruno; Joseph W. Radar transmitting structures
JPH0670301U (ja) * 1993-03-15 1994-09-30 日本電業工作株式会社 帯域通過ろ波器
JP3158963B2 (ja) * 1995-05-31 2001-04-23 株式会社村田製作所 アンテナ共用器
EP1061662B1 (de) 1998-11-10 2006-01-18 Matsushita Electric Industrial Co., Ltd. Hochfrequenzfunkschaltung
JP5906886B2 (ja) * 2012-03-29 2016-04-20 宇部興産株式会社 誘電体共振部品
DE102014007927A1 (de) 2014-05-27 2015-12-03 Kathrein-Werke Kg Hochfrequenzdichtes Gehäuse, insbesondere hochfrequenzdichtes Filtergehäuse
EP3748766A4 (de) 2018-01-31 2021-11-03 KMW Inc. Hohlraumfilter

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4431977A (en) * 1982-02-16 1984-02-14 Motorola, Inc. Ceramic bandpass filter
JPS59114902A (ja) * 1982-12-21 1984-07-03 Fujitsu Ltd 誘電体フイルタ
JPS60114004A (ja) * 1983-11-25 1985-06-20 Murata Mfg Co Ltd 誘電体フィルタの実装構造
JPS60152102A (ja) * 1984-01-19 1985-08-10 Murata Mfg Co Ltd 分布定数型フイルタ
JPS60254802A (ja) * 1984-05-30 1985-12-16 Murata Mfg Co Ltd 分布定数形フイルタ
JPS6152003A (ja) * 1984-08-21 1986-03-14 Murata Mfg Co Ltd 誘電体フイルタ
GB2165098B (en) * 1984-09-27 1988-05-25 Motorola Inc Radio frequency filters
JPH0624282B2 (ja) * 1986-07-16 1994-03-30 株式会社村田製作所 フイルタ装置

Also Published As

Publication number Publication date
DE3751062T2 (de) 1996-01-18
ATE118653T1 (de) 1995-03-15
CN87105317A (zh) 1988-04-27
CA1277729C (en) 1990-12-11
FI890243A (fi) 1989-01-17
FI890243A0 (fi) 1989-01-17
EP0318478A4 (de) 1989-11-20
DE3751062D1 (de) 1995-03-23
NO881269L (no) 1988-03-23
WO1988001104A1 (en) 1988-02-11
JPH01503428A (ja) 1989-11-16
NO173413C (no) 1993-12-08
NO173413B (no) 1993-08-30
EP0318478A1 (de) 1989-06-07
DK64488D0 (da) 1988-02-09
JP2764903B2 (ja) 1998-06-11
CN1011102B (zh) 1991-01-02
NO881269D0 (no) 1988-03-23
DK64488A (da) 1988-02-11

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