CA2067001A1 - Low loss, broadband stripline-to-microstrip transition - Google Patents
Low loss, broadband stripline-to-microstrip transitionInfo
- Publication number
- CA2067001A1 CA2067001A1 CA 2067001 CA2067001A CA2067001A1 CA 2067001 A1 CA2067001 A1 CA 2067001A1 CA 2067001 CA2067001 CA 2067001 CA 2067001 A CA2067001 A CA 2067001A CA 2067001 A1 CA2067001 A1 CA 2067001A1
- Authority
- CA
- Canada
- Prior art keywords
- stripline
- microstrip
- transition
- power divider
- divider network
- 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.)
- Abandoned
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P5/00—Coupling devices of the waveguide type
- H01P5/08—Coupling devices of the waveguide type for linking dissimilar lines or devices
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q21/00—Antenna arrays or systems
- H01Q21/0006—Particular feeding systems
- H01Q21/0075—Stripline fed arrays
Abstract
ABSTRACT OF THE DISCLOSURE
In a flat antenna incorporating one or more low-noise amplifier circuits onto a power divider network, a stripline-to-microstrip transition is provided. The amplifier circuit is mounted vertically on a block between a ground plane and the radiator level, so that, in the transition, the electric field of the stripline power divider is rotated 900 to the microstrip mode. A
block on which the circuit is mounted forms a connection between the ground plane and the layer of radiating elements which constitutes the other ground plane for the antenna.
In a flat antenna incorporating one or more low-noise amplifier circuits onto a power divider network, a stripline-to-microstrip transition is provided. The amplifier circuit is mounted vertically on a block between a ground plane and the radiator level, so that, in the transition, the electric field of the stripline power divider is rotated 900 to the microstrip mode. A
block on which the circuit is mounted forms a connection between the ground plane and the layer of radiating elements which constitutes the other ground plane for the antenna.
Description
2~7~1 LO~ ~oS8, BROA9BAND ~TRIPL~E-TO-NICRO8TRIP TRA~ITION
BACKGROUND OF THE INVENTIO~
The present invention relates to stripline-to-microstrip transitions, and in particular to such a transition incorporated in a printed-circuit antenna which in turn has incorporated therein a low noise amplifier (LNA) block.
Stripline-to-microstrip transitions are known, for example, in USP 4,862,120 and 4,870,375. USP 4,862,120 discloses a wideband stripline-to-microstrip transition in which the transmission mode of energy passes through a plurality of different transitions of transmission mode, from stripline to microstrip. Different interim ~odes include quasi-coax, a transitional mode, a double slot mode, and coplanar waveguide. This sequence of transitions eventually changes the stripline mode elec-tric field pattern, which extends in two directions from the stripline itself, to a microstrip mode electric field pattern, which extends in a single direction from the microstrip. However, the transition structure in this patent is somewhat complicated.
USP 4,870,375 discloses a disconnectable micro-strip-to-stripline transition, in which a phased array antenna contains a plurality of chassis, each including four antenna elements, each element having associated therewith operating electronics which are implemented in a monolithic microwave integrated circuit (MMIC) ap-proach. The transition is provided in removable form to enable disconnection of a module between an antenna distribution circuit and a beamformer distribution circuit. In the tran~ition, one low noise amplifier is associated with one antenna element.
In copending, commonly assigned Application No.
07/210,433, in which one of the named inventors is also an inventor of the present application, a low noise : ' 2~6'7~1 block down converter (LNB) employing MMICs is provided on a power dividing network layer in a printed circuit antenna which may include a stripline power divider network. The disclosure of that application is hereby incorporated herein by reference.
It is desirable to have a broadband stripline-to-microstrip transition between a power dividing network and one or more low-noise amplifier blocks, and to use a mount for the amplifier, if possible, as a connection between the ground plane of the antenna and a radiating element array which constitutes a second ground plane in the antenna.
SUM~ARY OF THE INVENTION
In view of the foregoing, it is an object of the invention to provide a broadband microstrip-to-stripline transition in which a low-noise amplifier is mounted on a metal block which forms a low resi~tance connection between a ground plane and a radiating element array, those two layers forming the ground planes for the stripline power dividing network.
In the inventive transition, the low-noise ampli-fier is mounted vertically to connect the ground plane and the radiating element layer. The stripline center conductor in the power dividing network layer i5 separa-ted from the microstrip conductor by approximately 10mils, with a gold wire connecting the two.
By orienting the LNA mounting block vertically with respect to the power dividing network layer, it is pos-sible to take advantage of the symmetry of the E-field in the stripline. The LNA block is a microstrip cir-cuit, whose field has a vertical orientation. This ver-tical orientation of the LNA mounting block folds down the E-field generated by the stripline, to yield an E-field oriented in the same way as that generated by microstrip.
2a~7~l BRIEF DESCRIPTION OF THE DRAWINGS
Figure 1 shows a top view of the inventive micro-strip-to-waveguide transition in accordance with one embodiment of the invention;
Figure 2 shows a front view of the transition of Figure l;
Figure 3 is a schematic of a vertical mounting of another view of the stripline-to-microstrip transition of the invention, implemented in a printed circuit antenna;
Figure 4 shows an end view of the. vertical mounting of Figure 3;
- Figure 5 shows an integrated low noise amplifier schematic;
Figure 6 shows a measurement of performance characteristics of a stripline test fixture without a microstrip circuit;
Figure 7 shows a measurement of the same fixture, but with microstrip transmission structure incorporated therein;
Figure 8 shows return loss and insertion loss without the microstrip mounting block;
Figure 9 shows return loss and insertion loss with the mounting block, but without a microstrip line element; and Figure 10 shows return loss of the test fixture with the microstrip line terminated in a 50 ohm chip resistor connected to the ground block.
DETAILED DESCRIPTION OF THE PRE~ ED EMBODIMENT
Figure 1 shows a top view of the inventive micro-strip-to-waveguide transition. The stripline center conductor 1 is connected to the low noise amplifier (LNA) circuit 3, which is mounted on an LNA mounting block 2, via a gold ribbon connect 4. The LNA circuit substrate, which is made of alumina, is 10 mils thick.
;
- ' ' ' - .
~7~1 The stripline center conductor 1 is approximately 212 mils wide in this embodiment, in order to achieve a 50 n characteristic impedance, with a ground plane spacing of 160 mils (see Figure 3). An air gap of approximately ~ mils exists between the LNA mounting block 2 and the end of the stripline 1. An air gap of approximately 2 mils exists between the end of the alumina substrate and the end of the stripline 1. The gold ribbon 4, which is approximately 5 mils wide, joins the stripline 1 to the microstrip 6 on the LNA circuit 3 (Figure 2) across the small air gap. In so doing, the ribbon 4 rotates through a 90 angle so that it lies flat on both the stripline center conductor 1 and the microstrip 6.
While Figure 1 shows the ribbon 4 lying flat on the stripline center conductor 1, Figure 2 shows the effect of the 90~ rotation, and thus shows the ribbon 4 lying flat on the microstrip 6.
In Figure 3, a printed circuit antenna includes a ground plane 10, a power divider network 20 and a radia-ting element array 30 comprised of a plurality of radia-ting elements (not shown). Individual elements of the power divider network 20 feed respective ones of the radiating elements. A low noise amplifier circuit 100, whicb may for example be a two-stage amplifier, is mounted on a metal block 110 which extends between the ground plane 10 and the radiating element array 30 to provide a low resistance connection. The radiating ele~ent array 30 constitutes the second ground plane of the antenna; thus, the metal block 110 extends between the two ground planes. An example of such an amplifier is shown in Figure 5.
Between the power divider network 20 and the micro-strip input 140 is a stripline-to-microstrip transition 130. As seen in Figures 1 and 2, a stripline center conductor 150 is provided on either side of the block i 2~
100. The conductor 150 is connected to the amplifier circuit 100 by the stripline-to-microstrip transition 130. The center conduc~or 150 and the microstrip input 140 and output 145 are separated by approximately 10 mils in the illustrated embodiment, and are connected together by a gold bond wire.
The gold bond is necessary because a DC connection, is required on the RF output for biasing purposes, bet-ween the amplifier circuit 100 and the stripline conduc-tor 150. Preferably the bond is a ribbon bond, such asthat used in microcircuit assembly, wherein the wire is approximately 5 mils wide and 1-2 mils thick. The stripline and microstrip transmission sections are impedance matched. The circuit 100 itself is configured so as to be self~biased, such that a single positive voltage is applied at t~e output as a bias, and positive and negative voltages are generated from that as neces-sary. A high electron mobility transistor (HEMT~ may be provided at the front end of the circuit to achieve the low noise characteristic.
With the foregoing construction, the vertical metal wall of the carrier block 110 forms a termination of the stripline transmission mode, in which the electric fields are oriented vertically between tha two ground planes comprising the ground plane 10 and the radiating element array 30. In the actual transition region, the electric fi~ld of the stripline mode is rotated by 90 to the microstrip mode, since the microstrip circuit itself is oriented vertically. Figure 4 shows the relative 90 orientation between the plane of the strip-line center conductor 150 and the microstrip circuit more clearly. The vertical orientation of the amplifier circuit 100 with respect to the power divider netw~rk makes it possible to take advantage of the symmetry of the electric ~ield in a stripline transmission mode, and 2~70~1 avoids the complicated structure of USP 4,862,120. The vertical orientation of the amplifier circuit "folds"
the upper portions of the field down, and also "folds"
the lower portions of the field up, to yield the microstrip electric field configuration.
As in copending Application No. 07/210,433, in order to have the LNA block mounted on the radiating element array, it is necessary to sacrifice certain ones of the radiating elements which otherwise might be put on the array. Since the elements may be weighted appropriately, the elements to be sacrificed may be selected so as to minimize the effect on performance of the antenna. For example, elements near the center of the antenna may be sacrificed by replacing the power divider elements which would excite them by the LNA
block.
Figure 5 is a schematic of one example of an integ-rated LNA circuit. In this particular example, the first and second stage devices are self-biased, and the single bias voltage is brought in through the RF output port.
Figure 6 shows a measurement of the stripline test fixture containing no microstrip circuit. Figure 6 was provided to obtain a baseline measurement to character-ize the return loss and insertion 1088 of the externalRF connectors and a lenqth of stripline between them.
Figure 7 shows the same measurement, but now with a 0.260" length of 50 ohm microstrip transmission line on a 10 mil thick alumina substrate inserted on a carrier block in the middle. The extra loss shown in this measurement arises primarily from the length of the microstrip line, and the two stripline-to-microstrip transitions at either end. After taking the inherent microstrip losses into account, it is found that the .. . . . .
,, .
2 ~
transition loss itself is less than 0.1 dB. This result is associated with a return loss of approximately 17 dB.
Figures 8-10 show that the energy in the stripline mode is coupled primarily to a microstrip mode by the transition structure.
While the invention has been described in detail with reference to a preferred embodiment, various modi-fications within the spirit of the invention will be apparent to those of workin~ skill in this technical field. Accordingly, the invention should be considered as limited only by the scope of the appended claims.
BACKGROUND OF THE INVENTIO~
The present invention relates to stripline-to-microstrip transitions, and in particular to such a transition incorporated in a printed-circuit antenna which in turn has incorporated therein a low noise amplifier (LNA) block.
Stripline-to-microstrip transitions are known, for example, in USP 4,862,120 and 4,870,375. USP 4,862,120 discloses a wideband stripline-to-microstrip transition in which the transmission mode of energy passes through a plurality of different transitions of transmission mode, from stripline to microstrip. Different interim ~odes include quasi-coax, a transitional mode, a double slot mode, and coplanar waveguide. This sequence of transitions eventually changes the stripline mode elec-tric field pattern, which extends in two directions from the stripline itself, to a microstrip mode electric field pattern, which extends in a single direction from the microstrip. However, the transition structure in this patent is somewhat complicated.
USP 4,870,375 discloses a disconnectable micro-strip-to-stripline transition, in which a phased array antenna contains a plurality of chassis, each including four antenna elements, each element having associated therewith operating electronics which are implemented in a monolithic microwave integrated circuit (MMIC) ap-proach. The transition is provided in removable form to enable disconnection of a module between an antenna distribution circuit and a beamformer distribution circuit. In the tran~ition, one low noise amplifier is associated with one antenna element.
In copending, commonly assigned Application No.
07/210,433, in which one of the named inventors is also an inventor of the present application, a low noise : ' 2~6'7~1 block down converter (LNB) employing MMICs is provided on a power dividing network layer in a printed circuit antenna which may include a stripline power divider network. The disclosure of that application is hereby incorporated herein by reference.
It is desirable to have a broadband stripline-to-microstrip transition between a power dividing network and one or more low-noise amplifier blocks, and to use a mount for the amplifier, if possible, as a connection between the ground plane of the antenna and a radiating element array which constitutes a second ground plane in the antenna.
SUM~ARY OF THE INVENTION
In view of the foregoing, it is an object of the invention to provide a broadband microstrip-to-stripline transition in which a low-noise amplifier is mounted on a metal block which forms a low resi~tance connection between a ground plane and a radiating element array, those two layers forming the ground planes for the stripline power dividing network.
In the inventive transition, the low-noise ampli-fier is mounted vertically to connect the ground plane and the radiating element layer. The stripline center conductor in the power dividing network layer i5 separa-ted from the microstrip conductor by approximately 10mils, with a gold wire connecting the two.
By orienting the LNA mounting block vertically with respect to the power dividing network layer, it is pos-sible to take advantage of the symmetry of the E-field in the stripline. The LNA block is a microstrip cir-cuit, whose field has a vertical orientation. This ver-tical orientation of the LNA mounting block folds down the E-field generated by the stripline, to yield an E-field oriented in the same way as that generated by microstrip.
2a~7~l BRIEF DESCRIPTION OF THE DRAWINGS
Figure 1 shows a top view of the inventive micro-strip-to-waveguide transition in accordance with one embodiment of the invention;
Figure 2 shows a front view of the transition of Figure l;
Figure 3 is a schematic of a vertical mounting of another view of the stripline-to-microstrip transition of the invention, implemented in a printed circuit antenna;
Figure 4 shows an end view of the. vertical mounting of Figure 3;
- Figure 5 shows an integrated low noise amplifier schematic;
Figure 6 shows a measurement of performance characteristics of a stripline test fixture without a microstrip circuit;
Figure 7 shows a measurement of the same fixture, but with microstrip transmission structure incorporated therein;
Figure 8 shows return loss and insertion loss without the microstrip mounting block;
Figure 9 shows return loss and insertion loss with the mounting block, but without a microstrip line element; and Figure 10 shows return loss of the test fixture with the microstrip line terminated in a 50 ohm chip resistor connected to the ground block.
DETAILED DESCRIPTION OF THE PRE~ ED EMBODIMENT
Figure 1 shows a top view of the inventive micro-strip-to-waveguide transition. The stripline center conductor 1 is connected to the low noise amplifier (LNA) circuit 3, which is mounted on an LNA mounting block 2, via a gold ribbon connect 4. The LNA circuit substrate, which is made of alumina, is 10 mils thick.
;
- ' ' ' - .
~7~1 The stripline center conductor 1 is approximately 212 mils wide in this embodiment, in order to achieve a 50 n characteristic impedance, with a ground plane spacing of 160 mils (see Figure 3). An air gap of approximately ~ mils exists between the LNA mounting block 2 and the end of the stripline 1. An air gap of approximately 2 mils exists between the end of the alumina substrate and the end of the stripline 1. The gold ribbon 4, which is approximately 5 mils wide, joins the stripline 1 to the microstrip 6 on the LNA circuit 3 (Figure 2) across the small air gap. In so doing, the ribbon 4 rotates through a 90 angle so that it lies flat on both the stripline center conductor 1 and the microstrip 6.
While Figure 1 shows the ribbon 4 lying flat on the stripline center conductor 1, Figure 2 shows the effect of the 90~ rotation, and thus shows the ribbon 4 lying flat on the microstrip 6.
In Figure 3, a printed circuit antenna includes a ground plane 10, a power divider network 20 and a radia-ting element array 30 comprised of a plurality of radia-ting elements (not shown). Individual elements of the power divider network 20 feed respective ones of the radiating elements. A low noise amplifier circuit 100, whicb may for example be a two-stage amplifier, is mounted on a metal block 110 which extends between the ground plane 10 and the radiating element array 30 to provide a low resistance connection. The radiating ele~ent array 30 constitutes the second ground plane of the antenna; thus, the metal block 110 extends between the two ground planes. An example of such an amplifier is shown in Figure 5.
Between the power divider network 20 and the micro-strip input 140 is a stripline-to-microstrip transition 130. As seen in Figures 1 and 2, a stripline center conductor 150 is provided on either side of the block i 2~
100. The conductor 150 is connected to the amplifier circuit 100 by the stripline-to-microstrip transition 130. The center conduc~or 150 and the microstrip input 140 and output 145 are separated by approximately 10 mils in the illustrated embodiment, and are connected together by a gold bond wire.
The gold bond is necessary because a DC connection, is required on the RF output for biasing purposes, bet-ween the amplifier circuit 100 and the stripline conduc-tor 150. Preferably the bond is a ribbon bond, such asthat used in microcircuit assembly, wherein the wire is approximately 5 mils wide and 1-2 mils thick. The stripline and microstrip transmission sections are impedance matched. The circuit 100 itself is configured so as to be self~biased, such that a single positive voltage is applied at t~e output as a bias, and positive and negative voltages are generated from that as neces-sary. A high electron mobility transistor (HEMT~ may be provided at the front end of the circuit to achieve the low noise characteristic.
With the foregoing construction, the vertical metal wall of the carrier block 110 forms a termination of the stripline transmission mode, in which the electric fields are oriented vertically between tha two ground planes comprising the ground plane 10 and the radiating element array 30. In the actual transition region, the electric fi~ld of the stripline mode is rotated by 90 to the microstrip mode, since the microstrip circuit itself is oriented vertically. Figure 4 shows the relative 90 orientation between the plane of the strip-line center conductor 150 and the microstrip circuit more clearly. The vertical orientation of the amplifier circuit 100 with respect to the power divider netw~rk makes it possible to take advantage of the symmetry of the electric ~ield in a stripline transmission mode, and 2~70~1 avoids the complicated structure of USP 4,862,120. The vertical orientation of the amplifier circuit "folds"
the upper portions of the field down, and also "folds"
the lower portions of the field up, to yield the microstrip electric field configuration.
As in copending Application No. 07/210,433, in order to have the LNA block mounted on the radiating element array, it is necessary to sacrifice certain ones of the radiating elements which otherwise might be put on the array. Since the elements may be weighted appropriately, the elements to be sacrificed may be selected so as to minimize the effect on performance of the antenna. For example, elements near the center of the antenna may be sacrificed by replacing the power divider elements which would excite them by the LNA
block.
Figure 5 is a schematic of one example of an integ-rated LNA circuit. In this particular example, the first and second stage devices are self-biased, and the single bias voltage is brought in through the RF output port.
Figure 6 shows a measurement of the stripline test fixture containing no microstrip circuit. Figure 6 was provided to obtain a baseline measurement to character-ize the return loss and insertion 1088 of the externalRF connectors and a lenqth of stripline between them.
Figure 7 shows the same measurement, but now with a 0.260" length of 50 ohm microstrip transmission line on a 10 mil thick alumina substrate inserted on a carrier block in the middle. The extra loss shown in this measurement arises primarily from the length of the microstrip line, and the two stripline-to-microstrip transitions at either end. After taking the inherent microstrip losses into account, it is found that the .. . . . .
,, .
2 ~
transition loss itself is less than 0.1 dB. This result is associated with a return loss of approximately 17 dB.
Figures 8-10 show that the energy in the stripline mode is coupled primarily to a microstrip mode by the transition structure.
While the invention has been described in detail with reference to a preferred embodiment, various modi-fications within the spirit of the invention will be apparent to those of workin~ skill in this technical field. Accordingly, the invention should be considered as limited only by the scope of the appended claims.
Claims (6)
1. In a printed-circuit antenna comprising a ground plane, a stripline power divider network disposed over said ground plane, a radiating element array disposed over said stripline power divider network, and a low noise amplifier (LNA) block disposed between said ground plane and said radiating element array, a stripline-to-microstrip transition comprising:
a stripline element associated with said power divider network;
a microstrip element, associated with said LNA
block, and impedance matched with said stripline element;
means for connecting said stripline element and said microstrip element electrically; and means for mounting said LNA block vertically between said ground plane and said radiating element array, said mounting means forming a low resistance connection between said ground plane and said radiating element array, vertical mounting of said LNA block effecting 90°
rotation of an electric field generated by said stripline element with respect to an electric field generated by said microstrip element, said mounting means forming a termination wall for said electric field generated by said stripline element.
a stripline element associated with said power divider network;
a microstrip element, associated with said LNA
block, and impedance matched with said stripline element;
means for connecting said stripline element and said microstrip element electrically; and means for mounting said LNA block vertically between said ground plane and said radiating element array, said mounting means forming a low resistance connection between said ground plane and said radiating element array, vertical mounting of said LNA block effecting 90°
rotation of an electric field generated by said stripline element with respect to an electric field generated by said microstrip element, said mounting means forming a termination wall for said electric field generated by said stripline element.
2. A transition as claimed in claim 1, wherein said stripline element comprises a stripline center conductor, and wherein said connecting means comprise gold bond wire.
3. A transition as claimed in claim 1, wherein said gold bond wire comprises ribbon wire substantially 5 mils wide and 1-2 mils thick.
4. A transition as claimed in claim 2, wherein said stripline center conductor and said microstrip element are separated by approximately 10 mils.
5. A transition as claimed in claim 1, wherein said radiating element array comprises a plurality of radiating elements, and said power divider network comprises a plurality of power divider network elements for feeding respective ones of said radiating elements individually.
6. A transition as claimed in claim 5, wherein said LNA block is placed on said power divider network so as to replace selected ones of said power divider network elements, so that radiating elements otherwise corresponding to said selected ones of said power divider network elements are not excited.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US821,200 | 1986-01-22 | ||
| US82120092A | 1992-01-15 | 1992-01-15 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2067001A1 true CA2067001A1 (en) | 1993-07-16 |
Family
ID=25232783
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2067001 Abandoned CA2067001A1 (en) | 1992-01-15 | 1992-04-24 | Low loss, broadband stripline-to-microstrip transition |
Country Status (5)
| Country | Link |
|---|---|
| EP (1) | EP0551556A1 (en) |
| JP (1) | JPH05267914A (en) |
| AU (1) | AU649325B2 (en) |
| CA (1) | CA2067001A1 (en) |
| TW (1) | TW212855B (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3476351B2 (en) * | 1997-11-27 | 2003-12-10 | シャープ株式会社 | Low noise amplifier |
| US6583763B2 (en) | 1999-04-26 | 2003-06-24 | Andrew Corporation | Antenna structure and installation |
| US6621469B2 (en) | 1999-04-26 | 2003-09-16 | Andrew Corporation | Transmit/receive distributed antenna systems |
| CN113169434B (en) * | 2018-12-04 | 2022-07-01 | 三菱电机株式会社 | Waveguide tube planar line converter and high-frequency module |
| CN111129757B (en) * | 2020-01-13 | 2022-06-14 | 上海安费诺永亿通讯电子有限公司 | Half-mode microstrip antenna and electronic equipment |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4600907A (en) * | 1985-03-07 | 1986-07-15 | Tektronix, Inc. | Coplanar microstrap waveguide interconnector and method of interconnection |
| DE3526046A1 (en) * | 1985-07-20 | 1987-01-22 | Bosch Gmbh Robert | Antenna array |
| FR2612697B1 (en) * | 1987-03-20 | 1989-06-16 | Thomson Csf | JUNCTION BETWEEN A PLAQUE LINE AND A MICRO-TAPE LINE AND APPLICATIONS |
| US4870375A (en) * | 1987-11-27 | 1989-09-26 | General Electric Company | Disconnectable microstrip to stripline transition |
| US4862120A (en) * | 1988-02-29 | 1989-08-29 | Canadian Patents And Development Limited/Societe Canadienne Des Brevets Et D'exploitation Limitee | Wideband stripline to microstrip transition |
-
1992
- 1992-04-24 CA CA 2067001 patent/CA2067001A1/en not_active Abandoned
- 1992-04-24 AU AU15154/92A patent/AU649325B2/en not_active Ceased
- 1992-05-14 EP EP92108183A patent/EP0551556A1/en not_active Withdrawn
- 1992-05-14 JP JP14817292A patent/JPH05267914A/en active Pending
-
1993
- 1993-03-31 TW TW82102398A patent/TW212855B/zh active
Also Published As
| Publication number | Publication date |
|---|---|
| AU1515492A (en) | 1993-07-29 |
| TW212855B (en) | 1993-09-11 |
| EP0551556A1 (en) | 1993-07-21 |
| AU649325B2 (en) | 1994-05-19 |
| JPH05267914A (en) | 1993-10-15 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Dead |