User's Manual

CY8CKIT-042-BLE-A Bluetooth® Low Energy (BLE) Pioneer Kit Guide, Doc. # 002-11468 Rev. *A 111
Hardware
5.2.5 Antenna Matching Network
An Antenna Matching Network is required between the BLE device and the antenna to achieve opti-
mum performance (Figure 5-25). The matching network has four main tasks:
Transform the balanced output of the radio to an unbalanced connection to the antenna (balun).
Transform the output impedance of the radio to a 50-ohm antenna.
Suppress harmonics to a level below the regulations level in TX mode.
Suppress the local oscillator (LO) leakage in RX mode.
Figure 5-25. Schematics and Board Highlight of Antenna Matching Network and Antenna