Abstract
AbstractPresently, realization of a high‐output FET amplifier with more than several tens of watts at microwave frequencies requires power combining. This paper proposes a low loss and broadband power combiner with a simple structure in which a cylindrical TMOmO mode (m × 2, 3, …) cavity with coaxial input and output lines is used. The effects of modes m and the number of devices to be combined are studied by means of an equivalent circuit. Since the spurious modes in the resonator degrade the reliability of the power‐combined FET amplifier, a structure is proposed in which slits and subcavity are attached to the TMOmO mode cavity for suppression of spurious modes. To verify the effectiveness of these structures, the spurious modes are excited and their reflection characteristics are measured. The insertion losses of the 4‐ and 8‐way combiners designed with m × 2 and 4 in the 12‐GHz band are 0.25 and 0.45 dB, respectively. An FET amplifier with a maximal output of 40 W is realized with the present power combiner.
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