Patent ID: 11909129
Assignee: TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)
Field: Telecommunications (Electrical engineering)
Classification: CPC H | IPC H

Claim 8:
9. The method according to claim 8, wherein the combiner derivation is a black-box combiner derivation and the lossy two-port parameters of the black-box combiner derivation is based on
determining (a1) a class-B bias of the main transistor and a class-C bias of the auxiliary transistor (a1),
finding (a2) the peak power of the Doherty PA and determining the output power back-off level where a second efficiency peak should occur,
finding (a2) optimized load impedances for the main and auxiliary transistors at peak power and finding the optimal load impedance for the main transistor at the pre-determined output power back-off,
calculating (a3) the two-port network parameters of a two-port output combiner from the optimized load impedances,
determining (a5) geometrical parameters of the antenna element that have critical effects on an antenna 2×2 impedance matrix without significantly disturbing the antenna radiation pattern shape and polarization,
optimizing (a7) the parameters such that the antenna impedance matrix is approaching or matching the two-port network parameters of the two-port output combiner.