Malherbe, J.A.G., 1940-2014-08-112014-08-112013-01Malherbe, JAG 2013, 'Pseudo-elliptic bandstop filter with 1:2:3 harmonic ratio stubs', Electronics Letters, vol. 49, no. 2, pp. 130-132.0013-5194 (print)1350-911X (online)10.1049/el.2012.3695http://hdl.handle.net/2263/41147By employing open circuited stubs with a length ratio of 1:2:3 separated by three unit elements, it is shown that a pseudo-elliptic frequency response can be obtained with a compact structure. It has an electrical performance comparable to that of a Cauer filter, but is realizable in etched form for very wide bandwidths and very high rates of cutoff.en© The Institution of Engineering and Technology 2013. This paper is a postprint of a paper submitted to and accepted for publication in Electronics Letters and is subject to Institution of Engineering and Technology Copyright. The copy of record is available at IET Digital Library.Pseudo-elliptic bandstop filterHarmonic ratio stubsPostprint Article