• John Daniel

Two types of antennas namely large single dish and array antennas are used for radio telescope construction. In part-I, by combining these two techniques, improved methods are suggested for the existing antennas of radio telescopes. In part-II, the relative convergence criteria are proved by many different methods. These proofs very clearly show that relative convergence does not occur due physical problems like edge diffraction and such convergence are purely due to mathematical approximation problems. Proofs are given for both waveguide wall discontinuity and the dielectric discontinuity. Since so far no proof was published in the literature, new relative convergence formulae are reported in the literature, even though actually they are not new problems. Such reported problems are proved to be same as that of original relative convergence. Reason for faster convergence of convergence of complex power (C.C.P.T.) method as compared with mode matching method is also explained. Power matching method using Perseval’s theorem is shown to be more efficient than mode matching and C.C.P.T.

Radio Telescopes, Single dish antennas, Array antennas and improved design, Mode matching methods, Conservation of Complex Power Techniques, Relative Convergence

"Contributions to high frequency engineering", International Journal of Emerging Technologies and Innovative Research (www.jetir.org), ISSN:2349-5162, Vol.6, Issue 6, page no.711-716, June 2019, Available :http://www.jetir.org/papers/JETIR1906Z99.pdf

"Contributions to high frequency engineering", International Journal of Emerging Technologies and Innovative Research (www.jetir.org | UGC and issn Approved), ISSN:2349-5162, Vol.6, Issue 6, page no. pp711-716, June 2019, Available at : http://www.jetir.org/papers/JETIR1906Z99.pdf