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Miniaturised tri-band lowpass–bandpass filter using lumped-element structure

Miniaturised tri-band lowpass–bandpass filter using lumped-element structure

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In this Letter, a miniaturised tri-band lowpass–bandpass (LP-BP) filter is proposed by using lumped-element structure. The lowpass passband (LP) and the first bandpass passband (1-BP) are produced by using the transmission zeros to divide a lowpass filtering response into a dual-band LP-BP filtering response. The second bandpass passband (2-BP) is produced by further loading a lumped-element circuit. As an example, an LP with 3 dB cut-off frequency of 1 GHz, and two BPs centred at 2.45/5.2 GHz for the WLAN applications are designed. The fabricated tri-band LP-BP filter has low passband insertion losses of 0.08/0.69/1.38 dB, and occupies a compact circuit area of 0.055λ gc × 0.063λ gc.

http://iet.metastore.ingenta.com/content/journals/10.1049/el.2018.8054
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