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In this paper we perform full-wave two-dimensional (2-D) simulation of the e-polarized beam wave guidance and scattering by a chain of four finite-size reflectors and mirrors modelling a typical fragment of quasioptical feeding circuit of a deep-space communication antenna. Elementary geometry tuning aimed at the maximum circuit transmission is also demonstrated. The feed beam generated by the aperture of a corrugated horn is simulated with the incident complex-source-point (CSP) field. Numerical solution is obtained from the coupled singular integral equations (IEs) discretized using new quadrature formulas of interpolation type that take full account of the IE kernel singularity and the edge behaviour.