POWER DIVIDER

• US 20140368294A1
• Filed: 08/08/2013
• Published: 12/18/2014
• Est. Priority Date: 06/18/2013
• Status: Active Grant

• Current Assignee: Electronics and Telecommunications Research Institute
• Original Assignee: Electronics and Telecommunications Research Institute
• Inventors: JU, JeongHo
• Granted Patent: US 9,270,007 B2
• Time in Patent Office: Days
• US Class Current: 333/125
• CPC Class Codes: H01P 5/16 Conjugate devices, i.e. devices having at least one port decoupled from one other port

Abstract

A power divider for a Wilkinson power divider includes a dielectric layer arranged at a lower part of the Wilkinson power divider and composed of at least one composite material: and a first composite right/left handed (CRLH) transmission line connected in series between the transformer line and the first output line. Further, the power divider for the Wilkinson power divider includes a second CRLH transmission line connected in series between the transformer line and the second output line.

Claims

1. A power divider for a Wilkinson power divider having an input line with a certain impedance value, a transformer line connected to the input line, first and second output lines divided at the transformer line, and an isolation resistor connected between the first and second output lines, the power divider comprising:

a dielectric layer arranged at a lower part of the Wilkinson power divider and composed of at least one composite material;

a first composite right/left handed (CRLH) transmission line connected in series between the transformer line and the first output line; and

a second CRLH transmission line connected in series between the transformer line and the second output line.

2. The power divider of claim 1, wherein the first CRLH transmission line and the second CRLH transmission line are equivalent to a combination of an RH transmission line including two serial inductors and a parallel capacitor and an LH transmission line including two serial capacitors and a parallel inductor.

3. The power divider of claim 2, wherein a value of the serial capacitor included in the LH transmission line is determined by a following equation:

4. The power divider of claim 3, wherein the cutoff frequency and characteristic impedance of the LH transmission line are defined by following equations:

5. The power divider of claim 3, wherein a value of the parallel inductor included in the LH transmission line is determined by a following equation:

L_L=Z_L²C_L

where L_L denotes the parallel inductor included in the LH transmission line, Z_L denotes characteristic impedance of the LH transmission line, and C_L denotes the serial capacitor included in the LH transmission line.

6. The power divider of claim 3, wherein a value of the serial inductor included in the RH transmission line is determined by a following equation:

7. The power divider of claim 5, wherein a value of the parallel capacitor included in the RH transmission line is determined by a following equation:

8. The power divider of claim 1, wherein a division ratio of power outputted from the first and second output lines is adjusted corresponding to Bloch impedance.

9. The power divider of claim 8, wherein the Bloch impedance is determined by a following equation:

10. The power divider of claim 1, wherein the first CRLH transmission line comprises:

a first inductor having a first terminal connected to a second terminal of the transformer;

a first capacitor having a first terminal connected to a second terminal of the first inductor;

a second inductor and a second capacitor having first terminals connected to a second terminal of the first capacitor and second terminals connected to a reference point;

a third inductor having a first terminal connected to the second terminal of the first capacitor and the first terminals of the second inductor and the second capacitor; and

a third capacitor having a first terminal connected to a second terminal of the third inductor and a second terminal connected to the first output line.

11. The power divider of claim 1, wherein the second CRLH transmission line comprises:

a fourth inductor having a first terminal connected to a second terminal of the transformer;

a fourth capacitor having a first terminal connected to a second terminal of the fourth inductor;

a fifth inductor and a fifth capacitor having first terminals connected to a second terminal of the fourth capacitor and second terminals connected to a reference point;

a sixth inductor having a first terminal connected to the second terminal of the fourth capacitor and the first terminals of the fifth inductor and the fifth capacitor; and

a sixth capacitor having a first terminal connected to a second terminal of the fifth inductor and a second terminal connected to the second output line.

12. A power divider for a Wilkinson power divider having an input line with a certain impedance value, a transformer line connected to the input line, first to fourth output lines divided at the transformer line, and first and second isolation resistors connected between the first to fourth output lines, the power divider comprising:

upper and lower dielectric layer arranged at upper and lower parts of the Wilkinson power divider and composed of at least one composite material;

a first composite right/left handed (CRLH) transmission line connected in series between the transformer line and the first output line;

a second CRLH transmission line connected in series between the transformer line and the second output line;

a third CRLH transmission line connected in series between the transformer line and the third output line; and

a fourth CRLH transmission line connected in series between the transformer line and the fourth output line.

13. The power divider of claim 12, wherein,

the first isolation resistor is connected between the first CRLH transmission line and the second CRLH transmission line, and

the second isolation resistor is connected between the third CRLH transmission line and the fourth CRLH transmission line.

14. The power divider of claim 12, wherein a division ratio of power outputted from the first to fourth output lines is adjusted corresponding to Bloch impedance.

15. A power divider for a Wilkinson power divider having an input line with a certain impedance value, a transformer line connected to the input line, first and second output lines divided at the transformer line, and first and second isolation resistors connected between the first and second output lines, the power divider comprising:

upper and lower dielectric layer arranged at upper and lower parts of the Wilkinson power divider and composed of at least one composite material;

a first composite right/left handed (CRLH) transmission line connected in series between the transformer line and the first isolation resistor;

a second CRLH transmission line connected in series between the first isolation resistor and the first output line;

a third CRLH transmission line connected in series between the transformer line and the first isolation resistor; and

a fourth CRLH transmission line connected in series between the first isolation resistor and the second output line.

16. The power divider of claim 15, wherein,

a first terminal of the first isolation resistor is connected to a second terminal of the first CRLH transmission line and a first terminal of the second CRLH transmission line, and a second terminal of the first isolation resistor is connected to a second terminal of the third CRLH transmission line and a first terminal of the fourth CRLH transmission line, and

a first terminal of the second isolation resistor is connected between a second terminal of the second CRLH transmission line and the first output line, and a second terminal of the second isolation resistor is connected between a second terminal of the fourth CRLH transmission line and the second output line.

17. The power divider of claim 15, wherein a division ratio of power outputted from the first and second output lines is adjusted corresponding to Bloch impedance.