Nanyang Technological University, Singapore
It is my honor to be the editor-in-chief of IJEETC. The journal publishes good papers which focous on the advanced researches in the field of electrical and electronic engineering & telecommunications.
Abstract—This paper presents the design and development of a combined L-band Radio Frequency (RF) amplifier which is implemented by combining two single-stage RF amplifiers in parallel. The applications such as radar systems, satellite systems, and wireless communications, require a high output power that is limited by a single-stage RF amplifier. The Class-A single-stage RF amplifier in this paper provides 95 W output power for the frequencies of 1.2 GHz to 1.3 GHz. The output power can be increased by the combined two single-stage RF amplifiers. The Wilkinson power dividers with a 90˚ phase shifter are used in this paper. The prototype power divider is realized by using low-cost FR4 PCBs. The constructed power dividers working at a center frequency of 1.25 GHz have lower than -10 dB reflected coefficients at all ports. The transmitted coefficients of S21 and S31 are -3.61 dB and -3.55 dB, respectively. A relative phase difference between the two output ports is 90˚±1˚. The combined amplifier achieves 175.4 W total output power, 14.74 dB gain, and efficiency 25% for a Continuous Wave (CW) input signal.
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