Journal ArticleDOI
Miniaturized parallel coupled-line bandpass filter with spurious-response suppression
TLDR
In this paper, a novel miniaturized parallel coupled-line bandpass filter with suppression of second and third harmonic frequencies is demonstrated, based on the capacitive termination on the conventional parallel coupled line to achieve size minimization, while the spurious responses are eliminated by the overcoupling approach.Abstract:
A novel miniaturized parallel coupled-line bandpass filter with suppression of second and third harmonic frequencies is demonstrated in this paper. This new filter is based on the capacitive termination on the conventional parallel coupled line to achieve size minimization, while the spurious responses are eliminated by the over-coupling approach. These features offer the classical parallel coupled-line bandpass filter simultaneous compactness and wide stopband performance. The simulations and measurements of a 900-MHz prototype bandpass filter are presented. The measured results agree well with the simulation. Compared with the conventional parallel coupled-line bandpass filter, the measured second and third spurious responses are suppressed to -64 and -55 dB, respectively. In addition, the circuitry size of the prototype filter can be reduced up to 25%.read more
Citations
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Journal ArticleDOI
Electronically Switchable Bandpass Filters Using Loaded Stepped-Impedance Resonators
TL;DR: In this article, a switchable bandpass filter with a wide stopband rejection was proposed, where the loaded diodes were used to switch the resonance conditions of the stepped-impedance resonators.
Journal ArticleDOI
Synthesis of capacitive-coupled dual-behavior resonator (CCDBR) filters
TL;DR: In this article, two topologies and associated syntheses are described for capacitive-coupled dual-behavior resonator filters, where the inverter is replaced with an equivalent scheme composed of a set of three capacitors.
Proceedings ArticleDOI
Compact Wilkinson power divider with simultaneous bandpass response and harmonic suppression
TL;DR: In this paper, an integrated power divider/bandpass filter component is proposed for simultaneous size reduction and harmonic suppression, where a stepped impedance interdigital coupling element is used to replace the conventional quarter wavelength impedance transforming section.
Journal ArticleDOI
Balanced Dual-Band Bandpass Filter With Multiple Transmission Zeros Using Doubly Short-Ended Resonator Coupled Line
TL;DR: In this paper, a balanced dual-band bandpass filter with in-band common-mode suppression via multiple transmission zeros from the doubly short-ended coupled line is presented.
Journal ArticleDOI
Parallel-coupled line filters with enhanced stopband performances
TL;DR: In this paper, a parallel-coupled line filter with broad stopband response is introduced, which is based on the synthesis of bandpass prototypes with pre-defined upper stopband characteristics.
References
More filters
Journal ArticleDOI
New microstrip "Wiggly-Line" filters with spurious passband suppression
Txema Lopetegi,Miguel A. G. Laso,J. Hernandez,M. Bacaicoa,D. Benito,M.J. Garde,M. Sorolla,Marco Guglielmi +7 more
TL;DR: In this paper, a parallel-coupled-line microstrip bandpass filter with suppressed spurious passband is presented, where the wave impedance is modulated so that the harmonic passband of the filter is rejected while the desired passband response is maintained virtually unaltered.
Journal ArticleDOI
Parallel-coupled microstrip filters with over-coupled end stages for suppression of spurious responses
TL;DR: In this paper, an over-coupled microstrip filter was proposed to suppress the unwanted responses at twice the passband frequency (2f/sub 0/), and the inherent transmission zero was shown tunable.
Journal ArticleDOI
Parallel coupled microstrip filters with suppression of harmonic response
TL;DR: In this paper, a corrugated coupled microstrip line is proposed to design planar microwave filters with suppression of spurious response at twice the center frequency (2f/sub o/).
Proceedings ArticleDOI
High performance parallel coupled microstrip filters
TL;DR: In this article, a construction technique is described that allows microstrip parallel-coupled filters to have greater passband symmetry while largely removing the parasitic passband at twice the center frequency.
Journal ArticleDOI
Transmission-line filters with capacitively loaded coupled lines
TL;DR: In this paper, coupled lines with different loads are analyzed and the rules for controlling the transmission-zero frequency are given, and the use of a skew-symmetric feed structure in these filters is also discussed and an example is given.