Antenna Bandwidth Expansion Guideline

Method for bandwidth expansion for chip antennas:

2450AT18B100 Bandwidth with original Eval board: 100MHz

2450AT18B100 Bandwidth with original Eval board: 100MHz

 

Layout with additional "elbow" to GND:

(A) Evaluation board

Layout with additional elbow to GND

 

(B) Detailed land pattern with dimensions (+ 2 variables)

Detailed land pattern with dimensions (+ 2 variables)

 

Return loss measurement (variables a and b dependent)

Return loss measurement (variables a and b dependent)

Bandwidth Summary with PIFA type. Table-1

Case New Bandwidth ( S11 Frequency Range
1=5mm, b=3.25mm
H-direction_1 PIFA
220 MHZ 2.32 ~ 2.54GHz
a=3mm, b=2.25mm
H-direction_3 PIFA
230 MHz 2.32 ~ 2.55GHz