Transient analysis of the thin-wire equiangular spiral antenna.

Author(s)

Renata Valerio de Freitas

• Document type: Doctoral Thesis
• Press: São Paulo.
• Institution: Universidade de São Paulo (USP). Escola Politécnica (EP/BC)
• Defense date: 2016-12-19

Examining board members

Luiz Cezar Trintinalia; Jorge Mieczyslaw Janiszewski; Antonio Roberto Panicali; Eduardo Barbosa Perri; Marcos Stefanelli Vieira

• Advisor: Luiz Cezar Trintinalia

Abstract

The applications for Ultra Wide Band have grown since the new regulation allowed the use of a new large frequency band. Since then, systems for pulsed transmission entered the spotlight. However, the antenna\'s project and study were in big part done in narrowband and sinusoidal steady-state. Besides, the impulse response is of much more interest for these systems than the frequency response. For this reason, the main goal of this work is to explore how current pulses propagate on the antenna to obtain an approximate impulse response. Moreover, an analytical model that unveils the relation between the antenna geometry and its current decay is presented. Through the study of the equiangular spiral it is possible to find the pulse decay as a function of the line length and the radiated field in a quantitative fashion. This result as well as the methods used to obtain it can be used for other antennas. (AU)

• FAPESP's process: 12/03292-0 - time-domain analysis of printed circuit antennas
• Grantee: Renata Valeri de Freitas
• Support Opportunities: Scholarships in Brazil - Doctorate