Antenna Bandwidth Expansion Guideline
Method for bandwidth expansion for chip antennas:
2450AT18B100 Bandwidth with original Eval board: 100MHz
Layout with additional "elbow" to GND:
(A) Evaluation board
(B) Detailed land pattern with dimensions (+ 2 variables)
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 |
