CST – Computer Simulation Technology

Title:
Computer-Aided Design of Ultra-Wideband Active Antennas by Means of a New Figure of Merit
Author(s):
Vittorio Rizzoli, Fellow, Alessandra Costanzo, Member, Paolo Spadoni
Source:
IEEE Microwave and Wireless Components Letters
Vol./Issue/Date:
Volume: 18, Issue: 4, April 2008
Year:
2008
Page(s):
290-292
Keywords:
Broadband nonlinear design, electromagnetic simulation, ultra-wideband (UWB) antennas
Abstract:
In this letter, we address the design of a compact printed ultra-wideband antenna connected to a traveling-wave power amplifier. The antenna and the amplifier are first separately optimized by conventional means with 50 terminations, which is found to result in suboptimal performance of the integrated assembly. The process is then repeated by a new design philosophy combining nonlinear harmonic-balance-based analysis with electromagnetic simulation. This approach makes use of a new figure of merit encompassing radiation and nonlinear performance, which allows the design goals to be formulated in terms of far-field performance. The proposed method leads to enhanced wideband radiation performance, strongly reducing the power density ripple across the band with respect to traditional techniques.
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