System level analysis of a 23 GHz transmitter design for point to point microwave link

The restricted spectrum frequency and the narrow bandwidth allocated by regulatory organizations to wireless users impacts the design of the RF front end. Narrowband amplification and filtering to avoid leakage to adjacent bands is required for transmitter design. Power spectrum of transmitter must not exceed the limits of spectral power density (2002). This paper presents a 23 GHz transmitter system for point-to-point microwave link. Linearity requirements for the transmitter need to be considered in order to have high power transmit. The system is designed with advanced design software (ADS). A 23 GHz transmitter comprises a double conversion up-converter. The simulation result of power transmit is 27.576 dBm. This is obtained over the 22.999 23.549 GHz frequency range. The design of transmitter is the proper choosing and arrangement of microwave components to meet the European telecommunications standards institute (ETSI) recommendations for point-to-point equipment in fixed radio systems operating at 23 GHz (2002).