USH781H - Method of making a ferrite circulator - Google Patents
Method of making a ferrite circulator Download PDFInfo
- Publication number
- USH781H USH781H US07/171,325 US17132588A USH781H US H781 H USH781 H US H781H US 17132588 A US17132588 A US 17132588A US H781 H USH781 H US H781H
- Authority
- US
- United States
- Prior art keywords
- ferrite
- fabrication
- microstrip circuit
- circulator
- cavity area
- 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
- 229910000859 α-Fe Inorganic materials 0.000 title claims abstract description 29
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 15
- 239000000463 material Substances 0.000 claims abstract description 12
- 238000007750 plasma spraying Methods 0.000 claims abstract description 4
- 238000001465 metallisation Methods 0.000 claims description 3
- 230000015572 biosynthetic process Effects 0.000 claims description 2
- 238000005137 deposition process Methods 0.000 claims description 2
- 238000010285 flame spraying Methods 0.000 claims description 2
- 238000005507 spraying Methods 0.000 claims description 2
- 238000000137 annealing Methods 0.000 claims 2
- 239000000758 substrate Substances 0.000 abstract description 4
- 238000000034 method Methods 0.000 description 11
- 239000000843 powder Substances 0.000 description 2
- 239000000919 ceramic Substances 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000010891 electric arc Methods 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P11/00—Apparatus or processes specially adapted for manufacturing waveguides or resonators, lines, or other devices of the waveguide type
Definitions
- This invention relates in general to a method of making a ferrite circulator and in particular to an improved method of introducing ferrite material into the cavity area of a microstrip circuit.
- a general object of this invention is to provide a simple and economical technique or method of making a ferrite circulator.
- a more particular object of this invention is to provide a method of introducing ferrite material into the cavity area of a microstrip circuit.
- Metallization can be applied to the surface of the anneal ferrite by flame spraying or by deposition processes after the ferrite is deposited. This method of ferrite fabrication is fast, accurate and low-cost as compared to conventional techniques. It also preserves or improves high isolation and low insertion loss over the operating circulator bandwidth.
- the method of the invention allows precise, simple and economical fabricating of ferrite -junction circulators in the microstrip media operating in the microwave and millimeter wave frequency region heretofore not possible with conventional fabrication techniques.
- arc plasma spraying as the term is used herein, is meant, a process of feeding ferrite powder into an electric arc where it is melted and directed to a target.
- arc plasma spraying a process of feeding ferrite powder into an electric arc where it is melted and directed to a target.
- any free flowing ferrite powders can be used.
- the method is generally short duration taking about 2 minutes.
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Non-Reversible Transmitting Devices (AREA)
Abstract
In the manufacture of a ferrite circulator, a ferrite material is introdu into the cavity area of a microstrip circuit or substrate by arc plasma spraying, thus eliminating any chance of gaps between ferrite material and microstrip circuit material.
Description
The invention described herein may be manufactured, used, and licensed by or for the Government for governmental purposes without the payment to us of any royalty thereon.
This invention relates in general to a method of making a ferrite circulator and in particular to an improved method of introducing ferrite material into the cavity area of a microstrip circuit.
Current millimeter wave microstrip circulators use a small metallized (top and bottom) ferrite puck that must be accurately cut and ground so as to tightly fit into a hole in a microstrip substrate, then electrically connected to the top conductor and bottom ground plane. This type of circulator requires a very close tolerance fit of the ferrite into the dielectric substrate for peak performance. It is therefore obvious that a need exists for a simplified fabrication technique, especially for operation at high frequencies (>10 GHz) where device parts and pieces become very small such that tolerances present costly fabrication problems.
A general object of this invention is to provide a simple and economical technique or method of making a ferrite circulator. A more particular object of this invention is to provide a method of introducing ferrite material into the cavity area of a microstrip circuit.
It has now been found that the aforementioned objects can be attained by arc plasma spraying the ferrite material into the cavity area of the microstrip circuit, thus eliminating any chance of gaps between ferrite material and microstrip substrate material.
Accurate and controlled spraying is possible with minimal surface finishing required after ferrite formation.
After the ferrite has been deposited, an anneal is required to optimize the magnetic properties.
Metallization can be applied to the surface of the anneal ferrite by flame spraying or by deposition processes after the ferrite is deposited. This method of ferrite fabrication is fast, accurate and low-cost as compared to conventional techniques. It also preserves or improves high isolation and low insertion loss over the operating circulator bandwidth.
The method of the invention allows precise, simple and economical fabricating of ferrite -junction circulators in the microstrip media operating in the microwave and millimeter wave frequency region heretofore not possible with conventional fabrication techniques.
By arc plasma spraying as the term is used herein, is meant, a process of feeding ferrite powder into an electric arc where it is melted and directed to a target. Such a process is shown in the articles "Arc Plasma Fabrication of Ferrite--Dielectric Composites" by R. W. Babbitt, American Ceramic Society Bulletin, June 1976, at page 566-568.
In the arc plasma or flame spray method, any free flowing ferrite powders can be used. The method is generally short duration taking about 2 minutes.
We wish it to be understood that we do not desire to be limited to the exact details as described for obvious modifications will occur to a person skilled in the art.
Claims (4)
1. In the manufacture of a ferrite circulator wherein a ferrite material is introduced into the cavity area of a microstrip circuit, the improvement of introducing the ferrite material into the cavity area by arc plasma spraying and subsequent annealing, thus eliminating any chance of gaps between ferrite material and microstrip circuit material.
2. A manufacture according to claim 1 wherein accurate and controlled spraying and annealing is possible with minimal surface finishing required after ferrite formation.
3. A manufacture according to claim 2 wherein metallization is applied to the surface of the ferrite by flame spraying after ferrite fabrication.
4. A manufacture according to claim 2 wherein metallization is applied to the surface of the ferrite by deposition processes after ferrite fabrication.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US07/171,325 USH781H (en) | 1988-03-21 | 1988-03-21 | Method of making a ferrite circulator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US07/171,325 USH781H (en) | 1988-03-21 | 1988-03-21 | Method of making a ferrite circulator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| USH781H true USH781H (en) | 1990-05-01 |
Family
ID=22623338
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US07/171,325 Abandoned USH781H (en) | 1988-03-21 | 1988-03-21 | Method of making a ferrite circulator |
Country Status (1)
| Country | Link |
|---|---|
| US (1) | USH781H (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5774025A (en) * | 1995-08-07 | 1998-06-30 | Northrop Grumman Corporation | Planar phase shifters using low coercive force and fast switching, multilayerable ferrite |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3935548A (en) | 1974-06-04 | 1976-01-27 | The Washington University | Wide-band microwave circulator |
| US3986149A (en) | 1975-08-29 | 1976-10-12 | The United States Of America As Represented By The Secretary Of The Air Force | High power reciprocal co-planar waveguide phase shifter |
| US4179795A (en) | 1978-06-15 | 1979-12-25 | The United States Of America As Represented By The Secretary Of The Army | Method for forming a drive hole in arc plasma spray fabricated ferrite phasors |
-
1988
- 1988-03-21 US US07/171,325 patent/USH781H/en not_active Abandoned
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3935548A (en) | 1974-06-04 | 1976-01-27 | The Washington University | Wide-band microwave circulator |
| US3986149A (en) | 1975-08-29 | 1976-10-12 | The United States Of America As Represented By The Secretary Of The Air Force | High power reciprocal co-planar waveguide phase shifter |
| US4179795A (en) | 1978-06-15 | 1979-12-25 | The United States Of America As Represented By The Secretary Of The Army | Method for forming a drive hole in arc plasma spray fabricated ferrite phasors |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5774025A (en) * | 1995-08-07 | 1998-06-30 | Northrop Grumman Corporation | Planar phase shifters using low coercive force and fast switching, multilayerable ferrite |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| STCF | Information on status: patent grant |
Free format text: PATENTED CASE |