Antenna arrangement

• US 6,512,489 B2
• Filed: 06/20/2001
• Issued: 01/28/2003
• Est. Priority Date: 06/23/2000
• Status: Expired due to Fees

• Current Assignee: NXP B.V. (NXP Semiconductors NV)
• Original Assignee: Philips Electronics North America Corporation (Koninklijke Philips N.V.)
• Inventors: Boyle, Kevin R.
• Primary Examiner(s): Wong, Don
• Assistant Examiner(s): CHEN, SHIH CHAO
• Application Number:
  US09/885,704
• Publication Number:
  US 20010054981A1
• Time in Patent Office: 587 Days
• Field of Search: 343/700.MS, 343/850, 343/852, 343/860
• US Class Current: 343/850
• CPC Class Codes: H01Q 5/00 Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements combinations of separate active antenna units operating in different wavebands and connected to a common feeder system H01Q21/30
• CPC Class Codes: H01Q 5/328 between a radiating element and ground
• CPC Class Codes: H01Q 5/335 at the feed, e.g. for impedance matching
• CPC Class Codes: H01Q 5/35 using two or more simultaneously fed points
• CPC Class Codes: H01Q 5/50 Feeding or matching arrangements for broad-band or multi-band operation
• CPC Class Codes: H01Q 9/0421 with a shorting wall or a shorting pin at one end of the element H01Q9/0414 takes precedence
• CPC Class Codes: H01Q 9/0442 with particular tuning means

Abstract

A antenna arrangement comprising a multiband antenna having at least one feed point; a multiplexer, the multiplexer comprising reciprocal networks and including at least one output coupled to the at least one feed point of the multiband antenna, the multiplexer further comprising at least one input for receiving at least one signal at a first frequency, wherein the coupling between the at least one feed point and the at least one output of the multiplexer has a substantially negligible impedance.

Claims

1. An antenna arrangement comprising:

a multiband antenna having at least one feed point;

a multiplexer, the multiplexer comprising reciprocal networks and including at least one output coupled to the at least one feed point of the multiband antenna, the multiplexer further comprising at least one input for receiving at least one signal at a first frequency, wherein the coupling between the at least one feed point and the at least one output of the multiplexer has a substantially negligible impedance.

2. The arrangement as claimed in claim 1 wherein the multiplexer is located close to the at least one antenna feed point.

3. The arrangement as claimed in claim 1, wherein the multiplexer further comprises antenna matching circuitry for matching the impedance of an antenna feed point to that of a transceiver port.

4. The arrangement as claimed in claim 1, wherein the antenna has a plurality of feed points, each corresponding to one or more operational frequency bands of the antenna.

5. The arrangement as claimed in claim 4, wherein the multiplexer is distributed between each of the feed points of the antenna.

6. A radio communications apparatus including an antenna arrangement, wherein the antenna arrangement comprises:

a multiband antenna having at least one feed point;

a multiplexer, the multiplexer comprising reciprocal networks and including at least one output couple to the at least one feed point of the multiband antenna, the multiplexer further comprising at least one input for receiving at least one signal at a first frequency, wherein the coupling between the at least one feed point and the at least one output of the multiplexer has a substantially negligible impedance.

7. An antenna arrangement comprising:

a multiband antenna having at least one feed point;

a multiplexer, the multiplexer comprising resonant circuits and including at least one output coupled to the at least one feed point of the multiband antenna, the multiplexer further comprising at least one input for receiving at least one signal at a first frequency, wherein the coupling between the at least one feed point and the at least one output of the multiplexer has a substantially negligible impedance;

wherein the resonant circuits comprise at least one of an open circuit series LC circuit and a short circuit parallel LC circuit.

8. The antenna arrangement as claimed in claim 7, wherein the multiband antenna includes at least a first and second feed point and the multiplexer includes at least a first and second output respectively coupled to the at least first and second feed points;

wherein the resonant circuits comprise open circuit series LC circuits.

9. The arrangement as claimed in claim 8, wherein the resonant circuits are tuned to be resonant at input frequencies other than those to be passed.