TY - JOUR A1 - Lozano Guerrero, Antonio José AU - Clemente Fernández, Francisco Javier AU - Monzó Cabrera, Juan AU - Pedreño Molina, Juan Luis AU - Díaz Morcillo, Alejandro Benedicto T1 - Precise evaluation of coaxial to waveguide transitions by means of inverse techniques Y1 - 2010 SN - 0018-9480 UR - http://hdl.handle.net/10317/1411 AB - In this paper, a new two-tier inverse characterization technique for coaxial to waveguide transition evaluation is presented and properly validated. The transition is characterized by estimating its scattering parameters and a cascade procedure is employed in order to compare simulations and measurements during the unterminating procedure. In contrast to other unterminating methods there are no restrictions concerning the number and type of standards and two transitions are simultaneously characterized. Additionally, genetic algorithms and the gradient descent method are used for error minimization during the unterminating stage. The accuracy of this two-tier inverse technique is evaluated as a function of the employed standards and the obtained results are compared to those provided by different well-known calibration algorithms. Results show that it is possible to properly characterize the coaxial to waveguide transition in a very flexible and accurate way. KW - Teoría de la Señal y las Comunicaciones KW - Transición coaxial de guía de onda KW - Medida inversa KW - Calibración de dos niveles KW - Coaxial to waveguide transitions KW - Inverse measurement KW - Two-tier calibration KW - Algoritmos genéticos (AG) KW - Genetic Algorithm (GA) LA - eng PB - IEEE Microwave Theory and Techniques Society ER -