Antenna Matching Network - Cypress CY8CKIT-042-BLE User Manual

Hardware
5.2.4

Antenna Matching Network

An Antenna Matching Network is required between the BLE device and the antenna to achieve opti-
mum performance
Transform the balanced output of the radio to an unbalanced connection to the antenna (balun).
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Transform the output impedance of the radio to a 50-ohm antenna.
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Suppress harmonics to a level below the regulations level in TX mode.
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Suppress the local oscillator (LO) leakage in RX mode.
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Figure 5-24. Schematics and Board Highlight of Antenna Matching Network and Antenna
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(Figure 5-24). The matching network has four main tasks:
CY8CKIT-042-BLE Bluetooth® Low Energy (BLE) Pioneer Kit Guide, Doc. # 001-93731 Rev. *C