Journal ArticleDOI
Novel compact parallel-coupled microstrip bandpass filters with lumped-element K-inverters
TLDR
In this paper, a compact parallel-coupled microstrip bandpass filter was proposed by using additional lumped inductors to realize K-inverters between coupled-line sections to achieve an equivalent to the quarter-wavelength (/spl lambda//4) resonator filters.Abstract:
Novel compact parallel-coupled microstrip bandpass filters are proposed by using additional lumped inductors to realize K-inverters between coupled-line sections to achieve an equivalent to the quarter-wavelength (/spl lambda//4) resonator filters. As a result, the filter order can be doubled without increasing the circuit area, and no repeated passband is observed at twice the center frequency. In addition, by introducing the cross-coupling effect, two transmission zeros at upper and lower stopbands may be created. Simple equivalent-circuit models are also established as effective design tools. Specifically, several compact fourth-order microstrip bandpass filters with good stopband rejection are implemented and carefully examined.read more
Citations
More filters
Journal ArticleDOI
Novel Balanced Coupled-Line Bandpass Filters With Common-Mode Noise Suppression
TL;DR: In this paper, a novel balanced coupled-line bandpass filters, using suitable balanced coupled line sections and quarter-wavelength resonators, are proposed to achieve the desired differential-mode response and the level of common-mode noise.
Journal ArticleDOI
Synthesis Design of Dual-Band Bandpass Filters With $\lambda/4$ Stepped-Impedance Resonators
Songbai Zhang,Lei Zhu +1 more
TL;DR: A fourth-order dual-band filter is designed using the proposed synthesis method to demonstrate improved dual-passband performance with sharpened out-of-band rejection skirts and high in-between-band isolation.
Journal ArticleDOI
Synthesis Method for Even-Order Symmetrical Chebyshev Bandpass Filters With Alternative $J/K$ Inverters and /spl lambda//4 Resonators
Songbai Zhang,Lei Zhu +1 more
TL;DR: In this article, a unified synthesis method for the bandpass filters based on the alternative J/K inverters and λ/4 microstrip line resonators is proposed, which is applied to design two classes of even-order Chebyshev band-pass filters with fourth and sixth order on microstrip-line topology, which operate at 2.4 GHz with the fractional bandwidths of 10% and 15%.
Journal ArticleDOI
Compact double-mode cross-coupled microstrip bandpass filter with tunable transmission zeros
TL;DR: In this paper, a double-mode cross-coupled microstrip bandpass filter with an asymmetric frequency characteristic and three transmission zeros is presented, which achieves a 59% size reduction compared to the conventional square loop dual-mode resonator.
Journal ArticleDOI
A Novel Compact Balanced-to-Unbalanced Low-Temperature Co-Fired Ceramic Bandpass Filter With Three Coupled Lines Configuration
Kun-Tzu Chen,Shyh-Jong Chung +1 more
TL;DR: In this article, a pre-design circuit is presented, which is composed of an inductive coupled line bandpass filter and an out-of-phase capacitive coupled-line band pass filter.
References
More filters
Journal ArticleDOI
Inductance calculations in a complex integrated circuit environment
TL;DR: In this paper, a method for calculating multiloop inductances formed by complicated interconnection conductors is described, where the conductor loops are divided into segments for which so-called partial inductances are calculated.
Journal ArticleDOI
Bandpass Filters Using Parallel Coupled Stripline Stepped Impedance Resonators
M. Makimoto,S. Yamashita +1 more
TL;DR: In this paper, approximate design formulas for bandpass filters using parallel coupled stripling stepped impedance resonators (SIR) are derived, taking into account the arbitrary coupling length as well as quarter-wavelength coupling.
Journal ArticleDOI
Parallel-Coupled Transmission-Line-Resonator Filters
TL;DR: In this article, the authors describe the synthesis of band-pass transmission-line filters consisting of series of half-wavelength resonant conductors such as strips, which differs from the usual end-coupled strip configuration in that successive strips are parallel coupled along a distance of a quarter wavelength.
Journal ArticleDOI
Microstrip stepped impedance resonator bandpass filter with an extended optimal rejection bandwidth
Jen-Tsai Kuo,E. Shih +1 more
TL;DR: In this paper, the fundamental and higher order harmonics of an SIR were analyzed against the length ratio of the high-Z and low-Z segments to obtain an optimal length ratio for each high-z to low-z impedance ratio to maximize the upper rejection bandwidth.