Affiliations: School of Electronics and Information Engineering, Sichuan University, Chengdu, Sichuan, China
Correspondence:
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Corresponding author: Xing Chen, School of Electronics and Information Engineering, Sichuan University, Chengdu 610064, Sichuan, China. Tel.: +86 134 5856 4058; E-mail:xingc@live.cn
Abstract: A hybrid full-wave electromagnetic (EM) field-circuit
simulation method, which aims at accurately analyzing microwave circuits, is
proposed. This method adopts the finite-difference time-domain (FDTD)
algorithm for the EM simulation, the sophisticated equivalent models in a
general circuit simulator SPICE for the circuit simulation, and hybridizes
the FDTD and SPICE by using the equivalent current source (ECS) approach.
Moreover, three techniques, which map a lumped circuit into FDTD cells as a
wire, surface or volume structure respectively, are thoroughly studied. The
formulae of the ECS with these three techniques are derived and introduced
in detail, and their influences on the simulation accuracy are analyzed. The
proposed method is applied to two sample circuits, a microstrip line and a
frequency selective surface (FSS), both of which are loaded with diode
pairs. The simulation results are compared with the measurement ones, and
good agreement is observed, indicating the accuracy and versatility of the
method.
Keywords: Finite-difference time-domain, SPICE, hybrid field-circuit simulation, equivalent current source
