Broadband power amplifier using hairpin bandpass filter matching network

• Published in: Electronics letters Vol. 56; no. 4; pp. 182 - 184
• Main Authors: Haider, Muhammad Furqan, You, Fei, Shi, Weimin, Ahmad, Shakeel, Qi, Tian
• Format: Journal Article
• Language: English
• Published: The Institution of Engineering and Technology 20.02.2020
• Subjects: band‐pass filters; broadband PA‐filter component; broadband power amplifier; Chebyshev filters; efficiency 48 percent to 56.6 percent; even–odd mode impedance analysis; fifth‐order Chebyshev low‐pass prototype element values; filter parameters; frequency 1.9 GHz to 3.1 GHz; hairpin bandpass filter matching network; highly selective bandpass response; impedance matching; low‐pass filters; microstrip filters; microwave filters; microwave power amplifiers; Microwave technology; output microstrip hairpin bandpass filter; spurious‐free fundamental impedance matching; efficiency 48 percent to 56.6 percent; microstrip filters; microwave power amplifiers; highly selective bandpass response; impedance matching; fifth-order Chebyshev low-pass prototype element values; broadband PA-filter component; broadband power amplifier; even–odd mode impedance analysis; band-pass filters; Chebyshev filters; frequency 1.9 GHz to 3.1 GHz; spurious-free fundamental impedance matching; output microstrip hairpin bandpass filter; microwave filters; low-pass filters; hairpin bandpass filter matching network; filter parameters
• ISSN: 0013-5194; 1350-911X; 1350-911X
• DOI: 10.1049/el.2019.3047

This Letter presents a new combination of a broadband power amplifier (PA) and an output microstrip hairpin bandpass filter. The filter is designed based on the fifth-order Chebyshev low-pass prototype element values. Even–odd mode impedance analysis is used to calculate the filter parameters. Meanwhile, only the fundamental impedance matching is considered for this design. Therefore, a highly selective bandpass response is obtained to provide a spurious-free fundamental impedance matching. For verification, a broadband PA-filter component across 1.9–3.1 GHz (48%) is designed and fabricated. Measurements have shown a drain efficiency of 48–56.6% with 39.3–40.5 dBm of maximum output power.