AU640811B2 - Common node reactance network for a broadband cross beam lumped element circulator - Google Patents
Common node reactance network for a broadband cross beam lumped element circulator Download PDFInfo
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- AU640811B2 AU640811B2 AU82482/91A AU8248291A AU640811B2 AU 640811 B2 AU640811 B2 AU 640811B2 AU 82482/91 A AU82482/91 A AU 82482/91A AU 8248291 A AU8248291 A AU 8248291A AU 640811 B2 AU640811 B2 AU 640811B2
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- Prior art keywords
- circulator
- circuit
- conductors
- conductive layer
- microstrip
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P1/00—Auxiliary devices
- H01P1/32—Non-reciprocal transmission devices
- H01P1/38—Circulators
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P1/00—Auxiliary devices
- H01P1/32—Non-reciprocal transmission devices
- H01P1/38—Circulators
- H01P1/383—Junction circulators, e.g. Y-circulators
- H01P1/387—Strip line circulators
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- Non-Reversible Transmitting Devices (AREA)
- Variable-Direction Aerials And Aerial Arrays (AREA)
Description
-1I- P/00/011 Regulation 3.2
AUSTRALIA
64 0811oi
ORIGINAL
COMPLE TE SPECIFICATION STANDARD PATENT 6S @6 0O
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0 6 6* Invention Title: COMMON NODE REACTANCE NETWORK FOR A BROADBAND CROSS BEAM LUMPED ELEMENT
CIRCULATOR
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The following statement is a full description of this invention, including 'L'ie best method of performning it kniown to us: 9 a 0 foe GH&CO REF: 3782-OG:CLC:RK 102 lA:rk
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COMMON NODE REACTANCE NETWORK FOR A BROADBAND CROSS BEAM LUMPED-ELEMENT CIRCULATOR BACKGROUND OF THE INVENTION 0 eta a: 0 0 The subject invention is generally directed to multiple port power directing circuits known as circulator circuits, and is directed more particularly to a relatively broad band lumped-element circulator circuit.
Circulator circuits are commonly utilized in microwave systems for directing microwave power between the ccmponents of a microwave system. For example, in radar systems, circulatorsiused to couple a transmission signal to the radiating antenna and to direct any signals that are received by the same antenna to the receiver while also maintaining isolation between both functions.
Present circulators used in microwave integrated circuits ?or microwave frequency operation include ferrite microstrip designs. A consideration with ferrice microstrip designs include size, particularly for phased array modules.
Known circulators also include those known as "lumpedelement" circulators which wied& have reduced size, relative to ferrite microstrip circulators, at microwave frequencies. However, the operating bandwidth of known lumped-element circulator designs at microwave frequencies weuw~14--besignificantly less than that of ferrite microstrip circulators.
2 The following references disclose microstrip circulators and lumped-element circulators: 1. "On Stripline Y-Circulation at UHF," H. Bosma, IEEE Transactions on Microwave Theory Tech., Vol. MTT-12, pp 61-72, Jan. 1964.
2. "Lumped Element Y Circulator," Y. Konishi, IEEE Transactions on Microwave Theory Tech., Vol. MTT-13, pp 852-865, Nov. 1965.
3. "Resonance Isolator and Y-Circ lator with Lumped- 10 Elements at VHF," J. Deutsch and B. Wiesser, IEEE Transac- /o ~tions on Magnetics, Vol. MAG-2, pp 278-282, Sept. 1966.
4. "A Compact Broad-Band Thin-Film Lumped-Element L- Band Circulator," R.H. Knerr, IEEE Transactions on Microwave Theory Tech., Vol. MTT-18, pp 1100-1108, Dec. 1970.
5. "An Improved Equivalent Circuit for the Thin-Film Lumped-Element Circulator," R.H. Knerr, IEEE Transactions on Microwave Theory Tech., Vol. MTT-20, pp 446-452, July 1972.
6. "A 4-GHz Lumped-Element Circulator," R.H. Knerr, 20 IEEE Transactions on Microwave Theory Tech., Vol. MTT-16, pp 150-151, Mar. 1973.
7. "Wideband Operation of Microstrip Circulators," Y.S. Wu and F.J. Rosenbaum, IEEE Transactions on Microwave Theory Tech., Vol. MTT-22, pp 849-856, Oct. 1974.
S 25 8. "Bidirectional Thin-Film Lumped Element Circulator," M. Kitlinski, Electronic Letters, Vol. 10, No. 6, 1974.
9. "The Frequency Behavior of Stripline Circulator Junctions," S. Ayter and Y. Ayasli, IEEE Transactions on Microwave Theory Tech., Vol. MTT-26, pp 197-202, Mar.
1978.
"Broad-Band Stripline Circulators Based on YIG and Li-Ferrite Single Crystals," E. Schloemann and R.E.
Blight, IEEE Transactions on Microwave Theory Tech., Vol.
MTT-34, pp 1394-1400, Dec. 1986.
3 11. "Circulators for Microwave and Millimeter Wave Integrated Circuits," E.F. Schloemann, Proceedings of the IEEE, Vol. 76, pp 188-200, Feb. 1988.
12. "Multiport Lumped Element Circulators," M.
Kitlinski, Technical University of Gdansk, Telecommunications Institute 80-852 Gdansk, Majakowskiego 11/12, Poland.
SUMMARY OF THE INVENTION The present invention provides a circulator circuit for use in a microwave circuit having a common ground plane, comprising: a ferrite disk having first and second parallel *9 sides; a plurality of microstrip conductors symmetrically 15 disposed on the first of said parallel sides of said ferrite disk, each of said conductors comprising first and second parallel strips commonly connected at each end wherein said strips of microstrip conductors are interwoven at central area of said ferrite disk to 0 20 maintain symmetry, and each of said conductors having a first end and a second end, the first ends of said conductors comprising ports of the circulator circuit; a first conductive layer disposed on the second of said parallel sides of side ferrite disk; means for electrically connecting said second ends of said conductors to said conductive layer; a second conductive layer dielectrically separated from said first conductive layer, and forming a capacitor with said first conductive layer; and microstrip line inductance means electrically connected between said second conductive layer and to the common ground plane; wherein said first and second conductive layers are made with thin-film photolithographic techniques.
It is an advantage of at least a preferred 1 embodiment of the invention to provide a microwave 3a circulator circuit having reduced size and relatively broad bandwidth.
It is a further advantage of at least a preferred embodiment of the invention to provide a relatively broad band microwave circulator utilizing known lumped-element circulator designs.
BRIEF DESCRIPTION OF THE DRAWINGS The advantages and features of the disclosed invention will readily be appreciated by persons skilled in the art from the following detailed description when read in conjunction with the drawing wherein: FIG. 1 is a schematic diagram depicting the operation of a circulator circuit.
FIGS. 2 and 3 illustrate a first implementation of 15 a circulator circuit in accordance with the invention.
FIGS. 4, 5, and 6 illustrate a second implementation *.t of a circulator circuit in accordance with the invention.
o* 03782-0G/29.06.93 Ce C I mm mime em
O
me* m m me t s -7 FIG. is a schematic diagram illustrating an equivalent circuit of the circulator circuit illustrated in FIGS.
2 and 3, and the circulator circuit in FIGS. 4, 5, and 6.
DETAILED DESCRIPTION OF THE DISCLOSURE In the following detailed description and in the several figures of the drawing, like elements are identified with like reference numerals.
10 Referring now to FIG. 1, shown therein is a schematic representation of the ideal operation of a three port circulator circuit 10. Ideally, the circulator has zero reflection at all ports and zero insertion loss in forward direction. As indicated in FIG. 1, such forward direction is from port 1 to port 2, from port 2 to port 3, and from port 3 to port 1. Further, the circulator ideally provides infinite isolation in the reverse direction. As indicated in FIG. 1, that reverse direction is from port 1 to port 3, from port 2 to port 1, and from port 3 to port 2.
20 Referring now to FIGS. 2 and 3, shown therein is a implementation of a circulator circuit in accordance with the invention. The circulator circuit includes an alumina substrate 11 that supports a common node reactance circuit and a lumped-element circulator that is coupled to ground via the series resonant circuit.
C mm m
CCCC
ace mm m The series common node reactance circuit includes a parallel plate capacitor and microstrip line inductances.
An equilaterally triangularly shaped metallized area 13 formed on the alumina substrate 11 forms the first plate of the capacitor. The second plate of the capacitor is part of the structure comprising the lumped-element circulator and is discussed further below. Microstrip line inductances 15a, 15b, 15c extend radially from the vertices of the metallized area 13 and are uniformly spaced about the 5 metallized area 13. The ends of the inductances are .1 O A- 4C 05
S.
S
C* S 05 S 55 5 of 0 s os connected to respective grounding pins 17a, 17b, 17c that extend downwardly through the substrate 11 and are electrically connected to a metallized area 19 on the bottom of the substrate 11. The metallized area 19 comprises the ground plane for the microstrip circuitry disposed on the substrate 11.
Supporting ridges 21 are disposed adjacent the respective sides of the metallized area 13 for separating such metallized area from the second plate of the coupling 10 capacitor that comprises a metallized layer 28 formed on the bottom of the structure comprising the lumped-element circulator.
By way of example, the metallized area 13 that comprises the first plate of the coupling capacitor and the microstrip line inductances 15 are formed pursuant to thin film photolithographic techniques, and the supporting ridges 21 comprise regions of developed photoresist.
The lumped-element circulator includes a ferrite disk 23 and three microstrip conductors 25a, 25b, 25c symmetri- 20 cally deposited on the ferrite disk 23. Each microstrip conductor comprises first and second parallel strips that are commonly connected at each end. To maintain symmetry, the strips of the microstrip conductors are interwoven at the central area of the ferrite disk.
The first ends of the microstrip conductors are connected to respective grounding straps 27a, 27b, 27c that extend down the side of the ferrite disk 23 to pkmetallization layer 28 formed on the bottom of the ferrite disk 23.
The second ends of the microstrip conductors are connected to respective terminating metallization areas 29a, 29b, 29c which are electrically connected to respective 50 ohm microstrip 31a, 31b, 31c via respective bonding strips 33a, 33b, 33c. The interwoven microstrip elements are separated from each other by appropriate dielectric layers (not shown), and the crossing portions of the conductors comr c- *i *0 0 0S t 0 0
OR
0 000* 3* 0 prise coupling capacitances between the respective crossing microstrip lines.
The assembly comprising the ferrite disk 23 and the components disposed thereon is bonded onto the substrate 11 by an adhesive layer 35 which further functions as the dielectric between the plates of the parallel plate coupling capacitor that includes the metallization area 13 disposed on the substrate 11 and the metallization layer 28 disposed on the bottom of the ferrite disk 23. As dis- 10 cussed above, the support ridges 21 maintain the separation between the capacitor plates comprising the metallization area 13 formed on the substrate 11 and the metallization layer 28 formed on the bottom of the ferrite disk 23.
The lumped-element circulator further includes a biasing magnet for providing a biasing magnetic field Hdc.
The conductor and dielectric layers on the top side of the ferrite disk 23 are made with thin-film photolithographic techniques, with several steps being utilized to accomplish the dielectric and conductor crossover areas.
20 The bottom side of the ferrite disk 23 is also metallized using thin-film metallization techniques.
Referring now to FIGS. 4, 5 and 6, shown therein is a further implementation of a circulator circuit in accordance with the invention. The circulator assembly which 25 incudes a common node reactance circuit and a lumpedelement circulator are inserted in a bore formed in a substrate 111 and are supported by a metal carrier 136.
The common node reactance circuit includes a microstrip parallel plate capacitor and a microstrip line inductance. A metallized notched circular area 113 comprising the first plate of the capacitor is formed on the bottom side of a dielectric disk 211. A microstrip line inductance 115 extends radially outward from the notch of the metallized notched circular area 113 to the edge of the 35 dielectric disk 211. The top side of Kdielectric disk 211 *060 0 r ~q d ~Lr~-49: has a metallization layer 116 comprising the second plate of the capacitor of the common node reactance circuit.
The top side of dielectric disk 211 is metallized using thin-film metallization techniques, and the metallization pattern on the bottom side of dielectric disk 211 is formed with thin-film photolithographic techniques.
The lumped-element circulator incudes a ferrite disk 123 and three microstrip conductors 125 symmetrically deposited on the ferrite disk 123. Each microstrip conduc- 10 tor comprises first and second parallel strips that are commonly connected at each end. To maintain symmetry, the strips of microstrip conductors are interwoven at the central area of the ferrite disk. The first ends of the microstrip conductors are connected to respective grounding straps 127 that extend down the side of the ferrite disk 123 to a metallization layer 128 formed on the bottom of the bottom of the ferrite disk 123. The second ends of the microstrip conductors are connected to respective terminating metallization areas 129 which are electrically connecti33 20 ed to respective 50 ohm microstrips i via respective ti3 b- 'ing strips 1ia3. The interwoven microstrip elements are separated from each other by appropriate dielectric layers (not shown), and the crossing portions of the conductors comprise coupling capacitances between the respective 25 crossing microstrip lines.
The conductor and dielectric layers on the top side of the ferrite disk 123 are made with thin-film photolithographic techniques, with several steps being utilized to accomplish the dielectric and conductor crossover areas.
The bottom side of the ferrite disk 123 is metellized using thin-film metallization techniques.
The lumped-element circulator circuit and the common node reactance circuit are jointed using conductive epoxy.
In particular, the metallization layer 128 of the ferrite /2 disk 123 is attached to the top side metallization layer r Vtt 0 j1 Ms^; 116 of the dielectric disk 211 with a conductive epoxy layer 130. The assembly comprising the common node reactance circuit and the lumped-element circulator circuit are aligned within the bore of the alumina substrate ll and attached to the metal carrier 136 using a eutectic solder layer 137. The diameter of the bore 138 in the metal carrier allows metallization tabs 135 and the end of microstrip line inductance 115 on the bottom side of dielectric disk 211 to be attached to the metal carrier 136 10 by the solder layer 137. This attachment electrically connects the microstrip line inductance 115 to the common ground plane 119.
The lumped-element circulator further includes a biasing magnet for providing a biasing magnetic field Hdc.
Referring now to FIG. 7, shown therein is a circuit schematic of an equivalent circuit of the broad band circulator circuit of the invention. The lumped-element circulator is represented by the lumped-element circulator equivalent circuit elements 57, 58, 59, and 60. The So" 20 inductances 57 represent the parallel split microstrip effective loaded inductances, and the capacitors 58 are the equivalent coupling capacitances formed by the central microstrip crossings. The inductances 60 are the end tab ese inductances and the resistors 59 represent the equivalent S 25 microstrip resistance losses.
The coupling capacitor and series inductance of the common node reactance circuit are represented by a capacitor 53 that is in series with an inductor 55. A capacitor 56 in parallel with the inductor 55 represents stray capacitance, To understand the operation of the invention, a brief description of the lumped-element circulator will be presented. To understand how circulation, forward coupling and reverse isolation is achieved in the lumped-element circulator, ferrite properties need to be considered.
Under the influence of a DC biasing magnetic field Hdc an electron in a ferrite will tend to align its axis of angular rotation in the direction of the biasing magnetic field. If a disturbing magnetic field is applied perpendicular to the direction of the biasing field, the electron will precess about its alignment axis until the damping mechanisms of the ferrite establish an equilibrium precession orbit. In the case of two oppositely directed, circularly polarized fields, the field polarized in the 10 direction of the precession angle will experience interaction with the ferrite material properties and the oppositely polarized field will have little or no interaction. The material interactions produce separate resonant frecuencies for the two oppositely directed, circularly polarized magnetic fields. The separate resonant frequencies will cause a rotation of the linear field that results from the combination of the two counter rotating, circularly polar-
S
ized fields.
The magnetically biased ferrite core rotates the 20 incoming disturbing) magnetic field such that the .5 magnetic field lines parallel isolate) one of the lumped-element circulator microstrips and cross "couple) the remaining microstrips. The lumped-element circular circulation is achieved by a non-reciprocal 25 inductive coupling due to the magnetically biased ferrite core of the microstrip coils. For example, a magnetic field incident at port 1 is rotated by the ferrite core, providing maximum magnetic induction between the conductive microstrip coils connected to ports 1 and 2, while maintaining minimum magnetic induction to the conductive microstrip coil connected to port 3. Also, note that the crossing conductor proximity of the lumped-element circulator design allows for tight magnetic coupling between the respective conductive microstrip coils.
In references cited in the preceding background section, it has been demonstrated that the performance of a three port lumped-element circulator may be analyzed by the characteristic eigen values of the equivalent lumpedelement model. The positive and negative rotating eigen values have been shown to be dependent on the ferrite properties and the resonating structure of the interwoven split conductors. The non-rotating eigen value, the •bandwidth limiting factor, has been shown to be uniquely 10 controlled by a coupling network that is common to all three conductive coils of the limped-element circulator.
With the additlon of the invention, a resonating common node reactance network, increased control is allowed of the non-rotating eigen value.
Set forth below relative to the equivalent circuit of FIG. 7 are circuit values for an illustrative example of a circulator circuit in accordance with the invention for a ferrite disk having a magnetic saturation (4nMs) of 3125 gauss, a line width (AH) of 150 oe, and a biasing internal 20 field of 2325 oe.
Inductances 57: 0.46 nH Resistors 59: 1 n Capacitances 58: 0.03 pF Capacitance 53: 2.13 pF Inductance 55: 0.214 nH Capacitance 56: 0.0 pF Inductances 60: 0.03 nH With the foregoing example, at a center frequency of 9.75 GHz, a bandwidth of 7.5 GHz was achieved with isolation greater than or equal to 20 dB and insertion loss less than or equal to 0.5 dB. Relative to performance of known lumped-element circulators, this example of a circulator in accordance with the invention achieves five-fold improvement.
The foregoing has been a disclosure of a circulator circuit that advantageously operates at microwave frequencies with greater than an octave operating bandwidth at a considerably reduced size.
Although the foregoing has been a description and illustration of specific embodiments of the invention, various modifications and changes thereto can be made by persons skilled in the art without departing from the scope and spirit of the invention as defined by the following 10 claims.
ft
Claims (4)
1. A circulator circuit for use in a microwave ci :uit having a common ground plane, comprising: a ferrite disk having first and second parallel sides; a plurality of microstrip conductors symmetrically disposed on the first of said parallel sides of said ferrite disk, each of said conductors comprising first and second parallel strips commonly connected at each end wherein said strips of microstrip conductors are interwoven at central area of said ferrite disk to maintain symmetry, and each of said conductors having a first end and a second end, the first ends of said conductors comprising ports of the circulator circuit; 15 a first conductive layer disposed on the second of :said parallel sides of side ferrite disk; means for electrically connecting said second ends of said conductors to said conductive laye a second conductive layer dielectrically separated 20 from said first conductive layer, and forming a capacitor with said first conductive layer; and microstrip line inductance means electrically connected between said second conductive layer and to the common ground plane; wherein said first and second conductive layers are made with thin-film photolithographic techniques.
2. The circulator circuit of claim 1, wherein said second conductive layer and said microstrip line inductance means are disposed on a substrate that supports said ferrite disk.
3. The circulator circuit of claim 1, wherein said second conductance layer and said microstrip line inductance means are disposed on a dielectric disk that is secured to said first conductive layer. 03' 0S79-0G/129.06.93 13
4. A circulator circuit substantially as hereinbefore described with reference Co figures 2 and 3 or 4, 5 and 6 in conjunction with figure 1. DATED this 29th day of June 1993 HUGHES AIRCRAFT COMPANY B y their Patent Attorneys GRIFFITH HACK &CO s so* so* 0.0,0
03782-OG/29.06.93 COMMON NODE REACTANCE NETWORK FOR A BROADBAND CROSS BEAM LUMPED-ELEMENT CIRCULATOR ABSTRACT OF THE DISCLOSURE A microwave circulator circuit having a multiple port lumped-element circulator, and a common node reactance network for coupling the lumped element circulator to the S! common ground plane of the microwave circuit with which the circulator circuit is utilized. a *s S S. o *S S S
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US56837890A | 1990-08-15 | 1990-08-15 | |
| US568378 | 1990-08-15 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| AU8248291A AU8248291A (en) | 1992-02-27 |
| AU640811B2 true AU640811B2 (en) | 1993-09-02 |
Family
ID=24271036
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| AU82482/91A Ceased AU640811B2 (en) | 1990-08-15 | 1991-08-14 | Common node reactance network for a broadband cross beam lumped element circulator |
Country Status (8)
| Country | Link |
|---|---|
| EP (1) | EP0472087B1 (en) |
| JP (1) | JPH0595207A (en) |
| KR (1) | KR930010678B1 (en) |
| AU (1) | AU640811B2 (en) |
| CA (1) | CA2048537A1 (en) |
| DE (1) | DE69127793T2 (en) |
| ES (1) | ES2109247T3 (en) |
| IL (1) | IL99092A (en) |
Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3147615B2 (en) * | 1993-10-12 | 2001-03-19 | 株式会社村田製作所 | Non-reciprocal circuit element for high frequency |
| JP3196491B2 (en) * | 1994-05-12 | 2001-08-06 | 株式会社村田製作所 | Non-reciprocal circuit device |
| US6263220B1 (en) * | 1997-03-11 | 2001-07-17 | Com Dev Ltd. | Non-etched high power HTS circuits and method of construction thereof |
| JP3405297B2 (en) * | 1999-11-30 | 2003-05-12 | 株式会社村田製作所 | Non-reciprocal circuit device, non-reciprocal circuit and communication device |
| KR100684148B1 (en) * | 2005-11-03 | 2007-02-20 | 한국전자통신연구원 | Digitally controlled circulator and radio frequency identification reader having the same |
| JP4900604B2 (en) * | 2007-09-26 | 2012-03-21 | Ｔｄｋ株式会社 | Non-reciprocal circuit element |
| RU2571526C1 (en) * | 2014-10-06 | 2015-12-20 | Российская Федерация, от имени которой выступает Государственная корпорация по атомной энергии "Росатом" | Circulator on lumped elements with double change of circulation direction |
| CN105226358A (en) * | 2015-10-30 | 2016-01-06 | 世达普(苏州)通信设备有限公司 | There is the microwave strip transmission line circulator of Broadband Matching |
| KR102291005B1 (en) * | 2018-11-27 | 2021-08-19 | 한양대학교 산학협력단 | Method for producing anode material for secondary battery |
| KR102364127B1 (en) * | 2018-12-31 | 2022-02-17 | (주) 세이크 | Polyurethane Composite Foam Having Silica Aerogel And The Method Thereof |
| CN113381151B (en) * | 2021-06-18 | 2023-05-05 | 中国电子科技集团公司第九研究所 | Miniaturized microstrip circulator circuit and circulator composed of same |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AU599876B2 (en) * | 1987-05-29 | 1990-07-26 | Nec Corporation | Lumped element circulator having a conductive pedestal frame structure |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3517340A (en) * | 1968-12-23 | 1970-06-23 | Bell Telephone Labor Inc | Circulator having conductive post capacitively coupled between first and second transmission line conductors for broadbanding purposes |
| JPS5250495B2 (en) * | 1972-03-31 | 1977-12-24 | ||
| JPS5232713B2 (en) * | 1972-05-24 | 1977-08-23 | ||
| JPS4975049A (en) * | 1972-11-22 | 1974-07-19 |
-
1991
- 1991-08-05 IL IL9909291A patent/IL99092A/en not_active IP Right Cessation
- 1991-08-07 CA CA002048537A patent/CA2048537A1/en not_active Abandoned
- 1991-08-12 ES ES91113525T patent/ES2109247T3/en not_active Expired - Lifetime
- 1991-08-12 DE DE69127793T patent/DE69127793T2/en not_active Expired - Lifetime
- 1991-08-12 EP EP91113525A patent/EP0472087B1/en not_active Expired - Lifetime
- 1991-08-14 AU AU82482/91A patent/AU640811B2/en not_active Ceased
- 1991-08-14 JP JP3204395A patent/JPH0595207A/en active Pending
- 1991-08-14 KR KR1019910014014A patent/KR930010678B1/en not_active IP Right Cessation
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AU599876B2 (en) * | 1987-05-29 | 1990-07-26 | Nec Corporation | Lumped element circulator having a conductive pedestal frame structure |
Also Published As
| Publication number | Publication date |
|---|---|
| ES2109247T3 (en) | 1998-01-16 |
| KR920005405A (en) | 1992-03-28 |
| KR930010678B1 (en) | 1993-11-05 |
| EP0472087A3 (en) | 1992-11-25 |
| IL99092A (en) | 1995-06-29 |
| EP0472087A2 (en) | 1992-02-26 |
| DE69127793D1 (en) | 1997-11-06 |
| IL99092A0 (en) | 1992-07-15 |
| JPH0595207A (en) | 1993-04-16 |
| DE69127793T2 (en) | 1998-01-15 |
| AU8248291A (en) | 1992-02-27 |
| EP0472087B1 (en) | 1997-10-01 |
| CA2048537A1 (en) | 1992-02-16 |
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