Multiple-way ring cavity power combiner and divider

• US 8,928,429 B2
• Filed: 05/17/2011
• Issued: 01/06/2015
• Est. Priority Date: 05/17/2011
• Status: Expired due to Fees

• Current Assignee: City University of Hong Kong
• Original Assignee: City University of Hong Kong
• Inventors: Song, Kaijun, Quan, Xue
• Primary Examiner(s): Lee, Benny
• Assistant Examiner(s): PATEL, RAKESH BHASKARBHAI
• Application Number:
  US13/109,305
• Publication Number:
  US 20120293274A1
• Time in Patent Office: 1,330 Days
• Field of Search: 333/125, 333/127, 333/128, 333134-137, 333/124
• US Class Current: 333/125
• CPC Class Codes: H01P 5/103 Hollow-waveguide/coaxial-line transitions
• CPC Class Codes: H01P 5/12 Coupling devices having more than two ports H01P5/04 takes precedence

Abstract

Multiple-way ring cavity power combiners and power dividers are disclosed. In one aspect, the disclosed ring cavity power combiners and power dividers can support a large number of devices by providing a large number of power-combining or power-dividing ports. In another aspect, the disclosed embodiments describe implementations employing a ring cavity that result in demonstrated performance characteristics suitable for UWB applications. Advantages provided include suppressing higher order modes and low losses among other advantages.

Claims

1. A method of power combining, comprising:

transmitting a plurality of radio frequency (RF) signals through a plurality of parallel connectors, wherein the plurality of RF signals are transmitted through respective connectors of the plurality of parallel connectors;

coupling the plurality of RF signals to a ring cavity by a plurality of probes associated with the plurality of parallel connectors, wherein the ring cavity comprises an annular region comprising an inner diameter and an outer diameter encompassing the plurality of probes and having a constant cross-section regardless of a number of the plurality of probes coupling the plurality of RF signals;

combining the plurality of RF signals in the ring cavity thereby creating a combined RF signal; and

transmitting the combined RF signal from the ring cavity to an output port through an impedance matching circuit.

2. The method of claim 1, wherein the transmitting the plurality of RF signals includes transmitting the plurality of RF signals through at least one of a type-N connector, a subminiature version A (type-SMA) connector, or a coaxial connector.

3. The method of claim 1, wherein the plurality of probes comprise at least one of an equal spacing within the ring cavity, an identical shape, an identical size, or a probe length defined by λ

₈/4, where λ

₈ is a wavelength at central frequency for a predetermined application of the power combining.

4. The method of claim 1, wherein the plurality of probes comprise at least one of a plurality of coaxial probes or a plurality of microstrip probes.

5. The method of claim 1, wherein the impedance matching circuit comprises a coaxial taper feeding port having a continuously tapering annular region from a first region proximate to the ring cavity to a second region proximate to the output port.

6. The method of claim 1, wherein the transmitting the combined RF signal through the impedance matching circuit includes transmitting the combined RF signal through a coaxial stepped impedance transformer.

7. A method of power dividing comprising:

transmitting an input radio frequency (RF) signal through a connector;

sending the input RF signal from the connector to a ring cavity comprising an inner diameter and an outer diameter and comprising an annular region surrounding a plurality of parallel probes and maintaining a constant cross-section independent of a number of the plurality of parallel probes;

splitting the input RF signal into the plurality of parallel probes in the ring cavity including generating a plurality of divided RF signals, each associated with one of the plurality of parallel probes;

transmitting the plurality of divided RF signals from the ring cavity to a plurality of ports associated with the plurality of parallel probes.

8. The method of claim 7, wherein the transmitting the input RF signal through the connector includes transmitting the input RF signal through at least one of a type-N connector, a subminiature version A (type-SMA) connector, or a coaxial connector.

9. The method of claim 7, wherein the plurality of parallel probes comprise at least one of an equal spacing around the ring cavity, an identical shape, an identical size, or a probe length defined by λ

₈/4, where λ

₈ is a wavelength at central frequency for a predetermined application of the power dividing.

10. The method of claim 7, wherein the plurality of parallel probes comprise at least one of a plurality of coaxial parallel probes or a plurality of microstrip parallel probes.

11. The method of claim 7, wherein the sending the input RF signal from the connector to the ring cavity includes passing the input RF signal through an impedance matching circuit comprising at least one of a coaxial taper feeding port or a coaxial stepped impedance transformer.

12. The method of claim 11, wherein input RF signal passes through a continuously tapering annular region from a first region proximate to the ring cavity to a second region proximate to the connector.

13. A device comprising:

a first port;

a ring cavity comprising an inner diameter and an outer diameter and comprising an annular region encompassing a plurality of parallel probes associated with a plurality of second ports, wherein the annular region is characterized by a pre-determined cross-section independent of a number of the plurality of parallel probes; and

an impedance matching circuit adapted to match impedance between the first port and the ring cavity.

14. The device of claim 13, wherein at least one of the first port or the plurality of second ports at least one of a type-N connector, a subminiature version A (type-SMA) connector, or a coaxial connector.

15. The device of claim 13, wherein the plurality of parallel probes comprise at least one of a plurality of coaxial parallel probes or a plurality of microstrip parallel probes.

16. The device of claim 13, wherein the impedance matching circuit comprises at least one of a coaxial taper feeding port having a continuously tapering annular region from a first region proximate to the ring cavity to a second region proximate to the first port or a coaxial stepped impedance transformer.

17. The device of claim 13, wherein the first port is configured as an input port, the plurality of second ports are configured as a plurality of output ports, and the device is configured as a power divider.

18. The device of claim 13, wherein the first port is configured as an output port, the plurality of second ports are configured as a plurality of input ports, and the device is configured as a power combiner.

19. The device of claim 13, wherein the plurality of parallel probes is further configured with at least one of an equal spacing around the ring cavity, an identical shape, an identical size, or a probe length defined by λ

₈/4, where λ

₈ is a wavelength at central frequency for a predetermined application of the device.

20. The device of claim 19, wherein the plurality of parallel probes is further configured with probe length defined by λ

₈/4, where λ

₈ is the wavelength at central frequency for the predetermined application of the device, and where the central frequency for the predetermined application lies in a frequency range from 3.1 to 10.6 GigaHertz (GHz).

21. A power divider comprising:

an input port;

a plurality of parallel output ports; and

a means for dividing a radio frequency signal in a ring cavity between the input port and the plurality of parallel output ports, wherein the ring cavity comprises an annular region characterized by an inner diameter and an outer diameter and a constant cross-section independent of a number of the plurality of parallel output ports.

22. A power combiner comprising:

a plurality of parallel input connectors for accepting a plurality of input radio frequency (RF) signals;

an output connector; and

a means for combining the plurality of input RF signals in a ring cavity between the plurality of parallel input connectors and the output connector, wherein the ring cavity comprises an inner diameter and an outer diameter defining an annular region having a cross-section that is independent of a number of the plurality of parallel input connectors.