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decrease zigbee wireless range wen i use chip antenna

Other Parts Discussed in Thread: CC2530

dear Mr YK Chen,

i want to use chip antenna for CC2530 , following

 

antenna characteristic is 50 OHM  and following link :

when i use this antenna , wireless range is very few , 1   to  1.5 meter   in channel 26 and 0dBm

but when i use wire instead of chip antenna wireless range is increase , 10 to 20 meter

can i increase wireless range whit chip antenna ?

Is impedance matching has been done?