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Spurious Responses Suppression of Parallel Coupled-Lines Microstrip Bandpass Filters: Comparison and Improvements of Planar Approaches

Marc Le Roy 1, * André Pérennec 1, *
* Corresponding author
1 Lab-STICC_UBO_MOM_DIM
Lab-STICC - Laboratoire des sciences et techniques de l'information, de la communication et de la connaissance, UBO - Université de Brest
Abstract : In this paper, three methods to reject the first spurious harmonic in parallel-coupled microstrip filters are investigated. The authors proposed an extension of these approaches to also suppress the second unwanted passbands while keeping the initial passband practically unchanged. Then, two of these techniques are combined to achieve a wider upper stopband. Indeed, the sinusoidal perturbation technique is well combined with overcoupled end sections to reject the first three spurious passbands of an order three filter. A comparison of simulations and experimental results is made, with a discussion on each method efficiency and possible applications to higher order filters.
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Marc Le Roy, André Pérennec. Spurious Responses Suppression of Parallel Coupled-Lines Microstrip Bandpass Filters: Comparison and Improvements of Planar Approaches. International Journal of Microwave Computer-Aided Engineering, 2007, 17 (1), pp.104-109. ⟨10.1002/mmce.20204⟩. ⟨hal-00468122⟩

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