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By 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 realisable in etched form for very wide bandwidths and very high rates of cutoff.
References
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3. Saal, R.: ‘Handbook of filter design’ (AEG-Telefunken, Berlin, 1979).
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2. Malherbe, J.A.G.: ‘Wide band bandstop filter with harmonic stubs’. XIII Int. Symp. on Microwave Optical Technology (ISMOT-2011), Prague, Czech Republic, June 2011.
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5. Malherbe, J.A.G.: ‘Microwave transmission line filters’ (Artech House, Dedham, MA, 1979).
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1. Malherbe, J.A.G.: ‘Wideband bandstop filter with sub-harmonic stubs’, Electron. Lett., 2011, 47, (10), pp. 604–605 (doi: 10.1049/el.2011.0604).
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J.A.G. Malherbe
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Wideband bandstop filter with sub-harmonic stubs.
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Sonnet ®, High Frequency Electromagnetic Software. http://www.sonnetsoftware.com/.
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R. Saal
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J.A.G. Malherbe
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(1979)
Microwave transmission line filters.
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Malherbe, J.A.G.: `Wide band bandstop filter with harmonic stubs', XIII Int. Symp. on Microwave Optical Technology (ISMOT-2011), June 2011, Prague, Czech Republic.
http://iet.metastore.ingenta.com/content/journals/10.1049/el.2012.3695
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content/journals/10.1049/el.2012.3695
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Pseudo-elliptic bandstop filter with 1:2:3 harmonic ratio stubs