| 摘要 |
The present invention discloses a method of enabling a dual band handset having both a low power system (e.g., PHS) and a high power system (e.g., GSM) arrangements to be ready to receive a call in standby through utilizing a dual band/dual mode antenna in cooperation with a dual band duplexer, wherein the dual band antenna has different resonant lengths in different operating frequencies. The higher of frequency the shorter of the resonant length of an antenna vibrator, the lower of frequency the longer of the resonant length of the antenna vibrator, the vibrator associated with high frequency is used when the operating frequency is low, and the increased vibrator is cut when the operating frequency is high so as to use the short vibrator only, thereby enabling the antenna to operate at either operating frequency.
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