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Design of Two L-Band RF Amplifiers Combination Using Wilkinson Power Dividers

Panya Hantula and Rangsan Tongta
School of Telecommunication Engineering, Institute of Engineering, Suranaree University of Technology, 111 University Avenue, Muang District Nakhon Ratchasima, Thailand

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.

Index Terms—L-band RF amplifier, Wilkinson power dividers, low-cost FR4 PCBs, two single-stage RF amplifiers combination

Cite: Panya Hantula and Rangsan Tongta, "Design of Two L-Band RF Amplifiers Combination Using Wilkinson Power Dividers," International Journal of Electrical and Electronic Engineering & Telecommunications, Vol. 9, No. 1, pp. 38-42, January 2020. Doi: 10.18178/ijeetc.9.1.38-42