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](/images/technotes/method-for-bandwidth-expansion-for-chip-antennas.gif)
Layout with additional "elbow" to GND:
(A) Evaluation board
![Layout with additional elbow to GND](/images/technotes/layout-with-additional-elbow-to-gnd.gif)
(B) Detailed land pattern with dimensions (+ 2 variables)
![Detailed land pattern with dimensions (+ 2 variables)](/images/technotes/detailed-land-pattern-with-dimensions.gif)
Return loss measurement (variables a and b dependent)
![Return loss measurement (variables a and b dependent)](/images/technotes/return-loss-measurement-variables-a-and-b-dependent.gif)
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 |