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Spurious responses suppression of parallel coupled-lines microstrip bandpass filters: Comparison and improvements of planar approaches

✍ Scribed by Marc Le Roy; André Pérennec

Publisher
John Wiley and Sons
Year
2007
Tongue
English
Weight
237 KB
Volume
17
Category
Article
ISSN
1096-4290

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✦ Synopsis

In this paper, three methods to reject the first spurious harmonic in parallelcoupled 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. V

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