Diplexer

• US 20030054775A1
• Filed: 09/18/2001
• Published: 03/20/2003
• Est. Priority Date: 09/18/2001
• Status: Abandoned Application

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Standke, Randolph E., Eaves, Neil Scott
• Application Number:
  US09/956,435
• Publication Number:
  US 20030054775A1
• Time in Patent Office: Days
• US Class Current: 455/80
• CPC Class Codes: H04B 1/005 adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges
• CPC Class Codes: H04B 1/406 with more than one transmission mode, e.g. analog and digital modes
• CPC Class Codes: H04B 1/52 Hybrid arrangements, i.e. arrangements for transition from single-path two-direction transmission to single-direction transmission on each of two paths or vice versa

Abstract

A diplexer for providing an efficient, low cost, passive, reliable system and method for sharing a single antenna between a cellular subsystem and a GPS subsystem. The inventive diplexer includes first and second devices coupled to an input node for receiving a composite signal having first and second component signals at first and second frequencies respectively. In accordance with the invention, the first device passes the first signal and provides an open circuit to the second signal, while the second device passes the second signal and provides an open circuit to the first signal. In the illustrative embodiment, the first and second devices are first and second transmission lines respectively. The transmission lines may be of any type, i.e., microstrip, stripline, coplanar waveguide etc.

Claims

1. A diplexer comprising:

first means coupled to an input node for receiving a composite signal having first and second component signals at first and second frequencies respectively and for passing the first signal and providing an open circuit to the second signal and

second means coupled to the input node for receiving the composite signal and passing the second signal and providing an open circuit to the first signal.

2. The diplexer of claim 1 wherein the first means and the second means are first and second transmission lines respectively.

3. The diplexer of claim 2 wherein the first and second transmission lines are microstrip transmission lines.

4. The diplexer of claim 2 wherein the first and second transmission lines are stripline transmission lines.

5. The diplexer of claim 2 wherein the first and second transmission lines are coplanar waveguides type transmission lines.

6. A communication system comprising:

an antenna;

a diplexer connected to the antenna, the diplexer having;

first means coupled to the antenna for receiving a composite signal having first and second component signals at first and second frequencies respectively and for passing the first signal and providing an open circuit to the second signal and

second means coupled to the antenna for receiving the composite signal and passing the second signal and providing an open circuit to the first signal;

a first circuit connected to the first means; and

a second circuit connected to the second means.

7. The communication system of claim 6 wherein the first means and the second means are first and second transmission lines respectively.

8. The communication system of claim 7 wherein the first and second transmission lines are microstrip transmission lines.

9. The communication system of claim 7 wherein the first and second transmission lines are stripline transmission lines.

10. The communication system of claim 7 wherein the first and second transmission lines are coplanar waveguides type transmission lines.

11. The communication system of claim 6 wherein the first circuit is includes cellular communications transceiver.

12. The communication system of claim 11 wherein the first circuit includes a PCS duplexer.

13. The communication system of claim 6 wherein the second circuit includes a position location data receiver.

14. The communication system of claim 13 wherein the position location data receiver is a Global Positioning System receiver.

15. The communication system of claim 13 wherein the first circuit includes a GPS filter.

16. A method for separating signals received from a shared antenna including the steps of:

first means coupled to the antenna for receiving a composite signal having first and second component signals at first and second frequencies respectively and for passing the first signal and providing an open circuit to the second signal and

second means coupled to the antenna for receiving the composite signal and passing the second signal and providing an open circuit to the first signal.