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A generalized balun structure with a single stub is presented in this paper. The balun is designed based on a four-port device with one port set to be open-circuited. Even-odd mode method is applied to analyze its performance. The derived design equations show that multiple sets of solutions are available for the proposed balun. Therefore, it is highly flexible for practical implementations. To validate...
We present two simplified Doherty power amplifier (DPA) structures to eliminate a quarter-wavelength impedance inverter used in the conventional DPA structure. The simplified DPA structures reduce the number of the impedance inverters, therefore they can be easily adopted in the broadband/multi-band applications of the DPA. To prove the design concept of the simplified DPA structures, a dual-band...
This paper presents the design and the applications of dual-band microwave power amplifiers using GaN transistors. First, a dual-band power amplifier using dual-band transmission line (TL) impedance matching networks, which can simultaneously match two different complex impedances to 50 Ω at two uncorrelated frequencies, is introduced. Secondly, design of a dual-band GaN based Doherty power amplifier...
In this letter, two types (Type-I and Type-II) of microwave baluns with generalized structures are presented. Different from the conventional transmission-line-based baluns where transmission lines or microstrip lines are used, the proposed baluns are constructed by transmission lines with arbitrary electrical lengths. Both of the two types of baluns are designed based on a symmetric...
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