Articles
Application Of FEKO For Rotman Lens
March 9, 2010
•Application Note: Application Of FEKO For Rotman Lens
By EM Software & Systems - S.A. (Pty) Ltd.
Introduction
Applications such as satellite and radar antennas require Beam Forming Networks (BFN) to produce correct feeding phases and amplitudes for their phased arrays. The Rotman lens is an example of a BFN with wide bandwidth and wide scan angle. Given the nature of the printed structure of Rotman Lens, method of moments (MoM) with Planar Green's Function is very suitable considering both accuracy and computation efficiency. In [1], simulations of Rotman lens are conducted with MoM in FEKO, and excellent agreement with measured data is observed.
Rotman Lens Model in FEKO
The Rotman Lens under consideration is 8x8 microstrip lens, with the layout shown in Fig. 1, whose beam ports 1 through 8 are marked as 1, receiving ports 9 through 16 are marked as 2, and dummy ports are marked as 0. Fig. 2 shows the Rotman lens prototype that was fabricated by the Army Research Lab in Adelphi, MD. This lens was designed at center frequency 4.6 GHz, and extensive S-parameter measurements were taken.
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