Open AccessMicro‐fabricated bandpass filter using intertwined spiral inductor and interdigital capacitor
Author(s) -
Chuluunbaatar Z.,
Adhikari K.K.,
Wang Cong,
Kim NamYoung
Publication year - 2014
Publication title -
electronics letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.375
H-Index - 146
ISSN - 1350-911X
DOI - 10.1049/el.2014.2040
Subject(s) - band pass filter , inductor , capacitor , materials science , spiral (railway) , filter (signal processing) , electronic engineering , optoelectronics , electrical engineering , engineering , voltage , mechanical engineering
A bandpass filter (BPF) with a central frequency of 2.31 GHz for future worldwide interoperability for microwave access (WiMax) applications using integrated passive device technology is presented. To realise the BPF, an interdigital capacitor is integrated between the two divisions of a square‐shaped spiral inductor. To achieve a compact size, the capacitor is fully embedded inside the inductor. Additionally, the coils of the inductor are intertwined to utilise enhanced mutual inductance for minimising the loss of signal transmission. The strong electromagnetic coupling between the source and load through the interdigital capacitor results in excellent bandpass skirt selectivity with a measured return loss of 26.1 dB. Moreover, it provides an improved stopband response due to the presence of a transmission zero at 5.94 GHz.