[天线]59 Improved transmission lne model for input impedance of rectangular microstrip antennas

Improved transmission lne model for input impedance of rectangular microstrip antennas with multi-dielectric layers ?m"|QS!!K  
Shunshi Zhong* and Gang Liu h##WA=1QZ  
Shanghai University of Science and Technology kv?|'DN  
Shanghai 201800, China ]=&L_(34  
V.Stassevich ``QHG&$/  
Moscow Institute of Physics and Technology n2ndjE$  
141700 Moscow Region, Dolgoprudny, Russia /"#4T^7&  
1. INTRODUCTION CjL<RJR=  
A number of investigations have carried out to determine the electrical characteristics of i~yX tya  
microstrip antennas with multi-dielectric layers using the spectral domain analysis (SDA) and /c-nE3+rn  
other full-wave analysis methods[' -21. However, the accurate numerical methods are timeconsuming JW+*d`8Z[  
and are not easily included in a CAD package. It can be that after almost RKkGITDk  
20 years of research the transmission line models (TLM) m still the fastest models to analyze ]/dVRkZeAE  
rectangular microstrip antennas. In all these years, the original simple variants of the xtfRrX^  
transmission line type of model have continuously been improved[3]. In this summary, a new RtV.d\  
improved TLM is presented, which refines original approximations and extends to the more d?L
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general configurations with multi-dielectric layers. )0CQP  
The improvements of the present model are mainly two techniques. First, a lossy TLM is $Ua56Y  
introduced with an attenuation constant a taking account of all of losses (dielectric, "{BqtU*.  
conductive, radiation and surface wave losses). Secondly, the multi-dielectric layer "mIgs9l$  
rectangular microstrip antenna is .. TI9X.E?
 
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