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one antenna with dual band frequency

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kyg

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hi all,

anyone know how to increase the effficiency for WLAN and Bluetooth band for one antenna?

i already design the PIFA antenna to get dual band,however the efficiency for high band is too low.

freq used : 2.4-2.5GHz
5.15GHz, 5.35GHz and 5.85GHz

the device also have metal frame that material is magnesium. i think
that material cause my antenna for 5GHz become worse.

the problem is what ever i have done the efficiency for 5GHz (WLAN) is too low
so i hope anyone can help me give some idea or advice how to increase the efficiency performance for the antenna

rgds,
kyg
 

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