Models of Small Microwave Devices in FDTD Simulation

Qing-Xin CHU  Xiao-Juan HU  Kam-Tai CHAN  

Publication
IEICE TRANSACTIONS on Electronics   Vol.E86-C   No.2   pp.120-125
Publication Date: 2003/02/01
Online ISSN: 
DOI: 
Print ISSN: 0916-8516
Type of Manuscript: INVITED PAPER (Special Issue on Circuit and Device Technology for High-Speed Wireless Communication)
Category: 
Keyword: 
extended FDTD methods,  microwave devices,  small size,  lumped models,  equivalent circuits,  

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Summary: 
In the FDTD simulation of microwave circuits, a device in very small size compared with the wavelength is often handled as a lumped element, but it may still occupy more than one cell instead of a wire structure without volume routinely employed in classical extended FDTD algorithms. In this paper, two modified extended FDTD algorithms incorporating a lumped element occupying more than one cell are developed directly from the integral form of Maxwell's equations based on the assumption whether displacement current exists inside the region where a device is present. If the displacement current exists, the modified extended FDTD algorithm can be represented as a Norton equivalent current-source circuit, or otherwise as a Thevenin equivalent voltage-source circuit. These algorithms are applied in the microwave line loaded by a lumped resistor and an active antenna to illustrated the efficiency and difference of the two algorithms.