In data communication system, the outdoor of Wireless Local Area Network (WLAN) technology can be implemented in bridge connection. It allows LANs in separated buildings to be connected over the distance ranging in several hundred meters. In RF system design level, the performance of the WLAN bridge also relies on the RF transmitter system where it must be well designed to minimize the nonlinear distortions in the system. This paper presents a RF transmitter system design for WLAN bridge at 5725 - 5825 MHz based on IEEE 802.11a standard. Based on the calculation and simulation results, the RF transmitter can transmit maximum output power of 24 dBm with -25 dB constellation error at 54 Mbps data rate which is, comply with the standard. Beside that, the prototype of the RF transmitter without filters has been measured to verify with the simulation results in term of gain compression.
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