736 PIERS Proceedings, Stockholm, Sweden, Aug. 12–15, 2013 Broadband Characterization Using Stripline Structure Ellen Yoshie Sudo Lutif 1, 2 , Alberto Jos´ e de Faro Orlando 1 , and Antonio Carlos da Cunha Migliano 2 1 Aerospace Technological Institute (ITA), CTA, Brazil 2 Institute of Advanced Studies (IEAv), CTA, Brazil Abstract— The finite difference time domain method has been used to design, simulate, and validate the measurement results for the stripline structure. An analysis of the resonant char- acteristics for a broadband waveguide by using the finite difference time domain method for the description of the electromagnetic behavior of the cell discontinuities in the analysis of the trans- mission and reflection coefficients, permits in the 500 MHz–50 GHz frequency band the achieve- ment of a good precision for the results. We will analyses the relation w/h =1.1. The sample shows a good transmission in the PCB stripline structure. An electromagnetic wave is formatted of the type TEM 50 × 50 mm 2 . The results show that Stripline EM field distribution is more symmetrical offering better control over even/odd mode impedance. Characteristic impedance is very sensitivity to the ratio of center conductor width to dielectric thickness and relativity insen- sitive to the ratio of center-conductor thickness to dielectric thickness. The stripline structure is then implemented on Alumina substrate and measured in the laboratory. The measurement and simulation results are found to be close in the frequency range of 1.5 GHz to 2.5 GHz. 1. INTRODUCTION Electromagnetic compatibility (EMC) analysis of integrated circuits (IC) is an important factor of IC performance. Due to the rapid increase in operation frequencies, RF interference and decrease in overall dimensions of the electronic circuits, the EMC performance of ICs can have great impact on system reliability. Any change in the component values in RF system affects the performance and can cause catastrophic failures. This can be prevented by using a material which has good thermal characteristics as a substrate and accurate design technique to design and implement the stripline at RF range. The stripline typically consists of a line conductor trace sandwiched between two reference planes and a dielectric material. The transmission line, i.e., the trace and planes, form the con- trolled impedance. The value of the impedance will be determined by its physical construction and electrical characteristics of the dielectric material. The fundamental propagation mode for a stripline is TEM. The S -parameter measurement benches employ a vector network analyzer and high-quality on-wafer system covering 0.05–10GHz. They allow fast and easy measurements of the S -parameters. If the width of the central conductor satisfies the condition W b−t ≥ 0.35, we can assume that the field at right side and left side do not interfere. The distributed capacitance C 1 mainly consists of two parallel plate capacitors and four edge capacitors: C 1 =2C p +4C ′ f (1) with C p = 0.0885ε r w b−t 2 (pF/cm) (2) C ′ f = 0.0885ε r π  2 1 − t b ln  1 1 − t b +1  −  1 1 − t b − 1  ln  1 ( 1 − t b ) 2 − 1  (pF/cm) (3) Therefore the characteristic impedance can be calculated using Z c = 94.15 √ ε r  w b 1− t b + C ′ f 0.0885ε r  (Ω) (4)