Journal ArticleDOI
A Two-Pole Two-Zero Tunable Filter With Improved Linearity
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TLDR
In this article, two miniaturized tunable filters with two zeros to result in sharp skirts were developed at 1.4-2.0 GHz on epsivr=6.15 substrate.Abstract:
Two miniaturized tunable filters with two zeros to result in sharp skirts were developed at 1.4-2.0 GHz on epsivr=6.15 substrate. The filters were built using single and back-to-back varactor diodes and compared for linearity characteristics. The single-diode filter has a 1-dB bandwidth of 5plusmn0.5% and an insertion loss of 2.5-1.8 dB. The back-to-back diode filter has a 1-dB bandwidth of 4.9 plusmn0.5% and an insertion loss of 2.9-1.25 dB (resonator Q of 56-125). The back-to-back diode filter was designed for improved linearity characteristics using two uniformly doped varactor diode and biased with a high impedance circuit. A detailed Volterra series analysis is done on the back-to-back diode including the effect of the bias network and diode mismatches. The measured IIP3 for the back-to-back diode tunable filter is 22-41 dBm depending on the bias voltage and is 13-15 dB better than the single-diode design. The power handling capabilities of both designs is explored using large-signal S 21 measurements. To our knowledge, these planar tunable filters represent state-of-the-art insertion loss and linearity characteristics performance with varactor diodes as the tuning elements.read more
Citations
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Journal ArticleDOI
Nonlinear Second-Order Topological Insulators.
TL;DR: It is shown that one-dimensional edge states and zero-dimensional corner states can be induced in a trivial crystal insulator made of evanescently coupled resonators with linear and nonlinear coupling coefficients, simply by tuning the intensity.
High- RF-MEMS 4-6-GHz Tunable Evanescent-Mode Cavity Filter
TL;DR: In this paper, a two-pole filter with an internal volume of 1.5 cm and an insertion loss of 4.91-3.18- and a 1-dB bandwidth of 17.8-41.1 MHz, respectively, is presented.
Journal ArticleDOI
High- $Q$ RF-MEMS 4–6-GHz Tunable Evanescent-Mode Cavity Filter
TL;DR: In this paper, a two-pole filter with an internal volume of 1.5 cm3 and an insertion loss of 4.91-3.18-and 1-dB bandwidth of 17.8-41.1 MHz, respectively, is presented.
Journal ArticleDOI
Corrugated Microstrip Coupled Lines for Constant Absolute Bandwidth Tunable Filters
TL;DR: In this paper, a microstrip corrugated coupled line concept is used to synthesize a coupling coefficient, which maintains a nearly constant absolute bandwidth across the tuning range, achieving a frequency coverage of 1.32-1.89 GHz and an insertion loss < 3 dB with a constant 1-dB bandwidth of 70 ± 4 MHz across the frequency range.
Journal ArticleDOI
Two- and Four-Pole Tunable 0.7–1.1-GHz Bandpass-to-Bandstop Filters With Bandwidth Control
Young-Ho Cho,Gabriel M. Rebeiz +1 more
TL;DR: In this article, a two-and four-pole 0.7-1.1 GHz tunable bandpass-to-bandstop filters with bandwidth control are presented, where the source/load and input/output coupling coefficients are controlled using an RF microelectromechanical system (RF MEMS) switch and a series coupling varactor, respectively.
References
More filters
Book
Distortion analysis of analog integrated circuits
Piet Wambacq,Willy Sansen +1 more
TL;DR: General techniques to suppress nonlinear behavior such as pre-distortion, linear and nonlinear feedback are explained in detail and illustrated with realistic examples to fill the gap between the theory of nonlinear systems and practical analog integrated circuits.
Journal ArticleDOI
Electronically Tunable Microwave Bandpass Filters
Ian Hunter,J.D. Rhodes +1 more
TL;DR: Combline filters with novel input and output coupling networks which enable broadband tuning to be achieved with minimum degradation in passband performance are discussed in this paper, where the design formulas for these filters are presented Computer analysis of varactor tuned combine bandpass filters including the small signal varactor equivalent circuit is presented enabling filter performance to be easily evaluated.
Journal ArticleDOI
A varactor-tuned RF filter
A.R. Brown,Gabriel M. Rebeiz +1 more
TL;DR: In this paper, an electronically tunable filter at 1 GHz was presented, which has a 60% tuning range from 700 MHz to 1.33 GHz with a low insertion loss.
Journal ArticleDOI
Voltage-controlled RF filters employing thin-film barium-strontium-titanate tunable capacitors
A. Tombak,Jon Paul Maria,F.T. Ayguavives,Zhang Jin,G.T. Stauf,Angus I. Kingon,Amir Mortazawi +6 more
TL;DR: Tunable lowpass and bandpass lumped-element filters employing barium-strontium-titanate (BST)-based capacitors are presented in this paper, where a new metallization technique is used, which improves the quality factor of the tunable BST capacitors by a factor of two.
Journal ArticleDOI
A differential 4-bit 6.5-10-GHz RF MEMS tunable filter
TL;DR: In this article, the authors presented a state-of-the-art RF microelectromechanical systems wideband miniature tunable filter designed for 6.5-10 GHz frequency range.
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