access icon free Broadband power amplifier using hairpin bandpass filter matching network

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.

Inspec keywords: band-pass filters; microstrip filters; impedance matching; Chebyshev filters; low-pass filters; microwave filters; microwave power amplifiers

Other keywords: efficiency 48 percent to 56.6 percent; broadband PA-filter component; fifth-order Chebyshev low-pass prototype element values; broadband power amplifier; spurious-free fundamental impedance matching; hairpin bandpass filter matching network; filter parameters; frequency 1.9 GHz to 3.1 GHz; even–odd mode impedance analysis; output microstrip hairpin bandpass filter; highly selective bandpass response

Subjects: Waveguide and microwave transmission line components; Amplifiers; Microwave circuits and devices; Filters and other networks

References

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      • 6. Zhu, L., Sun, S., Li, R.: ‘Conventional parallel-coupled line filter’ in ‘Microwave Bandpass Filters for Wideband Communications’ (John Wiley & Sons, Hoboken, NJ, USA, 2012), pp. 5384.
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      • 5. Haider, M.F., You, F., Qi, T., et al: ‘A 10W broadband power amplifier with a hairpin resonator filter based on even-odd mode impedance analysis’'. Proc. European Microwave Conf., Central Europe, Prague, Czech Republic, 2019, pp. 366369.
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http://iet.metastore.ingenta.com/content/journals/10.1049/el.2019.3047
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content/journals/10.1049/el.2019.3047
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