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Method and apparatus for improving the performance of a multi-band antenna in a wireless terminal

  • US 7,265,731 B2
  • Filed: 12/29/2004
  • Issued: 09/04/2007
  • Est. Priority Date: 12/29/2004
  • Status: Expired due to Fees
First Claim
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1. A multi-band antenna system for a wireless terminal comprising:

  • a multi-band antenna having a feed port and a ground port;

    a transmission circuit connected to the feed port, said transmission circuit configured to provide transmission signals to the multi-band antenna; and

    a matching network comprising a parallel passive circuit or a parallel active circuit connected in series to the ground port and configured to control an impedance of the multi-band antenna by implementing different antenna types for different transmission frequencies, said matching network configured to control the impedance by operating as an open circuit when the multi-band antenna operates in a first frequency band and as a short circuit when the multi-band antenna operates in a second frequency band.

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