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Design of tunable bandpass filter with an improved J‐inverter
Author(s) -
Nam Hee,
Lee MyeongGil,
Park JoungGeun,
Lee Byungje,
Choi JinJoo,
Kim JinYoung,
Lee JongChul
Publication year - 2013
Publication title -
microwave and optical technology letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.304
H-Index - 76
eISSN - 1098-2760
pISSN - 0895-2477
DOI - 10.1002/mop.27467
Subject(s) - varicap , band pass filter , inverter , capacitor , capacitance , microwave , variable capacitor , resonator , electrical engineering , bandwidth (computing) , materials science , optoelectronics , electronic engineering , insertion loss , engineering , physics , voltage , telecommunications , electrode , quantum mechanics
In this paper, a novel tunable bandpass filter with an improved J‐inverter is suggested. In this resonator, as the loading capacitance is increased, the resonant frequency is decreased. Also, the phase of the admittance inverter has characteristics that are variable by series capacitors and parallel varactor diodes. The electrical length of the inverter always maintains 90° at a given physical length of the inverter, which should be changed for different operating frequencies. This new bandpass filter has a tuning range of 1.8 GHz ∼ 2.45 GHz and an insertion loss of less than 2.5 dB. Also, the bandwidth is almost constant within the tuning range. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:852–855, 2013; View this article online at wileyonlinelibrary.com. DOI: 10.1002/mop.27467