Suthasinee Lamultree

Learn More
This paper presents a method to measure the characteristic impedances and propagation constant of bi-characteristic-impedance transmission lines (BCITLs). The derived expressions for determining the BCITL parameters via measurements are provided. An example of BCITLs is given for both passive (Re{Z<sub>0</sub> <sup>plusmn</sup>} ges 0) and active(More)
Abstract—Radiation characteristics of a probe-excited rectangular ring antenna are investigated by using the dyadic Green’s function approach. The radiation characteristics, such as radiation pattern, beam-peak direction, half-power beamwidth and directivity, are analyzed. For the specified operating frequency, the ring width and ring height are selected as(More)
This paper presents the method to determine the input impedance of conjugately characteristic-impedance transmission lines (CCITLs), implemented by multi-section lossless transmission lines (TLs), which can exhibit both non-negative (NNCR) and negative characteristic resistances (NCR). Meta-Smith charts are effectively employed to solve CCITL problems with(More)
This paper presents an analysis of reciprocal lossy periodic structures of transmission lines (TLs) by using the bi-characteristic-impedance TLs (BCITLs). It is found that the reciprocal lossy periodic TL structures (RLSPTLSs) can provide both non-negative (NNCR) and negative characteristic resistances (NCR) with proper complex propagation constants. In(More)
  • 1