Isolator/circulator having propeller resonator loaded with a plurality of symmetric magnetic walls

• US 6,646,515 B2
• Filed: 02/12/2002
• Issued: 11/11/2003
• Est. Priority Date: 12/14/2001
• Status: Expired due to Fees

• Current Assignee: Electronics and Telecommunications Research Institute
• Original Assignee: EG Co., Ltd., Electronics and Telecommunications Research Institute
• Inventors: Lee, Sang-seok, Jun, Dong-suk, Choy, Tae-goo
• Primary Examiner(s): Pascal, Robert
• Assistant Examiner(s): Jones, Stephen E.
• Application Number:
  US10/075,825
• Publication Number:
  US 20030112089A1
• Time in Patent Office: 637 Days
• Field of Search: H01/P.1387, 333/1.1, 333/24.2
• US Class Current: 333/1.1
• CPC Class Codes: H01P 1/387 Strip line circulators

Abstract

A microstripline/stripline included in an isolator/circulator is provided. The microstripline/stripline includes a resonator including a plurality of symmetric propellers, which are capable of transmitting signals in a single direction, slot formation units formed between the propellers to allow magnetic walls to be symmetrically generated and each including a plurality of slots, transfer tracks for bandwidth expansion formed at a side of each of the propellers within the range of the distance (the circumscribed radius of the resonator) between the center of the resonator and the outermost edge of the propeller, and ports formed at the ends of the transfer tracks. The microstripline/stripline further includes a coupler for detecting a reverse signal formed at the port, to which a load resistor is connected, and an indicator for indicating the reverse signal detected by the coupler in order to detect the state of the isolator and a system including the isolator. Accordingly, it is possible to manufacture a microstripline/stripline isolator/circulator to have a low insertion loss, high isolation, a wide bandwidth, a compact size, a low price, a simple structure, and a light weight, and it is possible to observe the state of the microstripline/stripline isolator/circulator and a system including the microstripline/stripline isolator/circulator.

Claims

1. An isolator having a microstripline/stripline comprising:

a resonator including a plurality of symmetric propellers, which are capable of transmitting signals in a single direction;

slot formation units formed between the propellers to allow magnetic walls to be symmetrically generated and each including a plurality of slots, said plurality of slots vary in size;

transfer tracks for bandwidth expansion formed at a side of each of the propellers within the range of the distance (the circumscribed radius of the resonator) between the center of the resonator and the outermost edge of the propeller; and

ports formed at the ends of the transfer tracks.

2. The isolator of claim 1 further comprising a coupler for detecting a reverse signal formed at the port, to which a load resistor is connected, and an indicator for indicating the reverse signal detected by the coupler in order to detect the state of the isolator and a system including the isolator.

3. The isolator of claim 1, wherein the frequency of the resonator can be controlled by controlling the ratio of the sum of the length of each of the slots and the distance (the inscribed radius of the resonator) between the center of the resonator and the outermost edge of the slot formation units with respect to the circumscribed radius of the resonator.

4. The isolator of claim 1, wherein magnetic coupling quantity can be controlled by modifying the width and length of each of the slots while maintaining the inscribed radius of the resonator 0.6 times greater than the circumscribed radius of the resonator.

5. A circulator having a microstripline/Stripline comprising:

a resonator including a plurality of symmetric propellers, which are capable of transmitting signals in a single direction;

slot formation units formed between the propellers to allow magnetic walls to be symmetrically generated and each including a plurality of slots, said plurality of slots vary in size;

transfer tracks for bandwidth expansion formed at a side of each of the propellers within the range of the distance (the circumscribed radius of the resonator) between the center of the resonator and the outermost edge of the propeller; and

ports formed at the ends of the transfer tracks.

6. The circulator of claim 5 further comprising a coupler for detecting a reverse signal formed at any of the ports, and an indicator for indicating the reverse signal detected by the coupler in order to detect the state of the circulator and a system including the circulator.

7. The circulator of claim 5, wherein the frequency of the resonator can be controlled by controlling the ratio of the sum of the length of each of the slots and the distance (the inscribed radius of the resonator) between the center of the resonator and the outermost edge of the slot formation units with respect to the circumscribed radius of the resonator.

8. The circulator of claim 5, wherein magnetic coupling quantity can be controlled by modifying the width and length of each of the slots while maintaining the inscribed radius of the resonator 0.6 times greater than the circumscribed radius of the resonator.

9. A stripline isolator comprising:

an upper ferrite substrate;

a lower ferrite substrate;

a stripline interpolated between the upper and lower ferrite substrates;

an upper case for a ground electrode located over the upper ferrite substrate and having through holes, into which a plurality of screws can be inserted, the upper case, in which an upper permanent magnet is installed;

a lower case for the ground electrode located under the lower ferrite substrate and having grooves, into which the plurality of screws can be fit, the lower case, in which a lower permanent magnet is installed;

an upper and lower cover for protecting a magnetic field;

side covers for constituting a closed circuit;

SMA connectors for connecting the stripline to an external circuit; and

a load resistor,

wherein the stripline comprises a resonator including a plurality of symmetric propellers, which are capable of transmitting signals in a single direction, slot formation units formed between the propellers to allow magnetic walls to be symmetrically generated and each including a plurality of slots, said plurality of slots vary in size, transfer tracks for bandwidth expansion formed at a side of each of the propellers within the range of the distance (the circumscribed radius of the resonator) between the center of the resonator and the outermost edge of the propeller, and ports formed at the ends of the transfer tracks, a step difference as much as the thickness of the upper and lower ferrite substrates and the stripline exists in the lower case so that the upper and lower cases can be fit into each other to be in gear with each other, a groove, in which the load resistor will be installed, is prepared in the lower case, and the upper and lower cover simultaneously covers the upper and lower sides of the upper and lower cases assembled together without the need of additional assembling screws.

10. The stripline isolator of claim 9 further comprising a coupler for detecting a reverse signal formed at the port, to which the load resistor is connected, and an indicator for indicating the reverse signal detected by the coupler in order to detect the state of the stripline isolator and a system including the stripline isolator.

11. The stripline isolator of claim 9, wherein the frequency of the resonator can be controlled by controlling the ratio of the sum of the length of each of the slots and the distance (the inscribed radius of the resonator) between the center of the resonator and the outermost edge of the slot formation units with respect to the circumscribed radius of the resonator.

12. The stripline isolator of claim 11, wherein the radius of the upper and lower permanent magnets is less than the circumscribed radius of the resonator and is no less than the inscribed radius of the resonator.

13. The stripline isolator of claim 9, wherein magnetic coupling quantity can be controlled by modifying the width and length of each of the slots while maintaining the inscribed radius of the resonator 0.6 times greater than the circumscribed radius of the resonator.

14. A stripline circulator comprising:

an upper ferrite substrate;

a lower ferrite substrate;

a stripline interpolated between the upper and lower ferrite substrates;

an upper case for a ground electrode located over the upper ferrite substrate and having through holes, into which a plurality of screws can be inserted, the upper case, in which an upper permanent magnet is installed;

a lower case for the ground electrode located under the lower ferrite substrate and having grooves, into which the plurality of screws can be fit, the lower case, in which a lower permanent magnet is installed;

an upper and lower cover for protecting a magnetic field;

side covers for constituting a closed circuit; and

SMA connectors for connecting the stripline to an external circuit,

wherein the stripline comprises a resonator including a plurality of symmetric propellers, which are capable of transmitting signals in a single direction, slot formation units formed between the propellers to allow magnetic walls to be symmetrically generated and each including a plurality of slots, said plurality of slots vary in size, transfer tracks for bandwidth expansion formed at a side of each of the propellers within the range of the distance (the circumscribed radius of the resonator) between the center of the resonator and the outermost edge of the propeller, and ports formed at the ends of the transfer tracks, a step difference as much as the thickness of the upper and lower ferrite substrates and the stripline exists in the lower case so that the upper and lower cases can be fit into each other to be in gear with each other, and the upper and lower cover simultaneously covers the upper and lower sides of the upper and lower cases assembled together without the need of additional assembling screws.

15. The stripline circulator of claim 14, further comprising a coupler for detecting a reverse signal formed at any of the ports and an indicator for indicating the reverse signal detected by the coupler in order to detect the state of the stripline circulator and a system including the stripline circulator.

16. The stripline circulator of claim 14, wherein the frequency of the resonator can be controlled by controlling the ratio of the sum of the length of each of the slots and the distance (the inscribed radius of the resonator) between the center of the resonator and the outermost edge of the slot formation units with respect to the circumscribed radius of the resonator.

17. The stripline circulator of claim 16, wherein the radius of the upper and lower permanent magnets is less than the circumscribed radius of the resonator and is no less than the inscribed radius of the resonator.

18. The stripline circulator of claim 14, wherein magnetic coupling quantity can be controlled by modifying the width and length of each of the slots while maintaining the inscribed radius of the resonator 0.6 times greater than the circumscribed radius of the resonator.

19. A microstripline isolator comprising:

a ferrite substrate;

a microstripline prepared on the ferrite substrate;

an upper case for a ground electrode located over the ferrite substrate and having through holes, into which a plurality of screws can be inserted, the upper case, in which an upper permanent magnet is installed;

a lower case for the ground electrode located under the ferrite substrate and having grooves, into which the plurality of screws can be fit, the lower case, in which a lower permanent magnet is installed;

an upper and lower cover for protecting a magnetic field;

side covers for constituting a closed circuit;

SMA connectors for connecting the microstripline to an external circuit; and

a load resistor,

wherein the microstripline comprises a resonator including a plurality of symmetric propellers, which are capable of transmitting signals in a single direction, slot formation units formed between the propellers to allow magnetic walls to be symmetrically generated and each including a plurality of slots, said plurality of slots vary in size, transfer tracks for bandwidth expansion formed at a side of each of the propellers within the range of the distance (the circumscribed radius of the resonator) between the center of the resonator and the outermost edge of the propeller, and ports formed at the ends of the transfer tracks, a step difference as much as the thickness of the ferrite substrate and the microstripline exists in the lower case so that the upper and lower cases can be fit into each other to be in gear with each other, a groove, in which the load resistor will be installed, is prepared in the lower case, and the upper and lower cover simultaneously covers the upper and lower sides of the upper and lower cases assembled together without the need of additional assembling screws.

20. The microstripline isolator of claim 19 further comprising a coupler for detecting a reverse signal formed at the port, to which the load resistor is connected, and an indicator for indicating the reverse signal detected by the coupler in order to detect the state of the microstripline isolator and a system including the microstripline isolator.

21. The microstripline isolator of claim 19, wherein the frequency of the resonator can be controlled by controlling the ratio of the sum of the length of each of the slots and the distance (the inscribed radius of the resonator) between the center of the resonator and the outermost edge of the slot formation units with respect to the circumscribed radius of the resonator.

22. The microstripline isolator of claim 21, wherein the radius of the upper and lower permanent magnets is less than the circumscribed radius of the resonator and is no less than the inscribed radius of the resonator.

23. The microstripline isolator of claim 19, wherein magnetic coupling quantity can be controlled by modifying the width and length of each of the slots while maintaining the inscribed radius of the resonator 0.6 times greater than the circumscribed radius of the resonator.

24. A microstripline circulator comprising:

a ferrite substrate;

a microstripline prepared on the ferrite substrate;

an upper case for a ground electrode located over the ferrite substrate and having through holes, into which a plurality of screws can be inserted, the upper case, in which an upper permanent magnet is installed;

a lower case for the ground electrode located under the ferrite substrate and having grooves, into which the plurality of screws can be fit, the lower case, in which a lower permanent magnet is installed;

an upper and lower cover for protecting a magnetic field;

side covers for constituting a closed circuit; and

SMA connectors for connecting the microstripline to an external circuit;

wherein the microstripline comprises a resonator including a plurality of symmetric propellers, which are capable of transmitting signals in a single direction, slot formation units formed between the propellers to allow magnetic walls to be symmetrically generated and each including a plurality of slots, said plurality of slots vary in size, transfer tracks for bandwidth expansion formed at a side of each of the propellers within the range of the distance (the circumscribed radius of the resonator) between the center of the resonator and the outermost edge of the propeller, and ports formed at the ends of the transfer tracks, a step difference as much as the thickness of the ferrite substrate and the microstripline exists in the lower case so that the upper and lower cases can be fit into each other to be in gear with each other, and the upper and lower cover simultaneously covers the upper and lower sides of the upper and lower cases assembled together without the need of additional assembling screws.

25. The microstripline circulator of claim 24 further comprising a coupler for detecting a reverse signal formed at any of the ports and an indicator for indicating the reverse signal detected by the coupler in order to detect the state of the microstripline circulator and a system including the microstripline circulator.

26. The microstripline circulator of claim 24, wherein the frequency of the resonator can be controlled by controlling the ratio of the sum of the length of each of the slots and the distance (the inscribed radius of the resonator) between the center of the resonator and the outermost edge of the slot formation units with respect to the circumscribed radius of the resonator.

27. The microstripline circulator of claim 26, wherein the radius of the upper and lower permanent magnets is less than the circumscribed radius of the resonator and is no less than the inscribed radius of the resonator.

28. The microstripline circulator of claim 24, wherein magnetic coupling quantity can be controlled by modifying the width and length of each of the slots while maintaining the inscribed radius of the resonator 0.6 times greater than the circumscribed radius of the resonator.