Journal ArticleDOI
Bandpass Filter With Tunable Bandwidth Using Quadruple-Mode Stub-Loaded Resonator
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TLDR
In this article, a quadruplemode resonator bandpass filter with tunable bandwidth is proposed, where two types of microwave varactors are used to tune the resonant frequencies and transmission zeros (TZs).Abstract:
In this letter, a novel quadruple-mode resonator bandpass filter (BPF) with tunable bandwidth is proposed. By using two types of microwave varactors to tune the resonant frequencies and transmission zeros (TZs), the high-side edge of the passband and low-side edge of the passband can be separately varied. Therefore, the bandwidth could be tunable with reasonable adjust of the values of varactors. Theoretical expressions have been derived for the resonant frequencies and the TZs. The measured results of the BPF show that the fractional bandwidth can be tuned from 22% to 34% at a fixed centre frequency 2.0 GHz with a return loss better than dB. The tested results show good agreement with simulated results.read more
Citations
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Journal ArticleDOI
Compact Balanced Dual- and Tri-band Bandpass Filters Based on Stub Loaded Resonators
TL;DR: In this article, a stub loaded resonator (SLR) is proposed to achieve dual-band or tri-band differential-mode bandpass response with a high common-mode suppression.
Journal ArticleDOI
Electrical Tunable Microstrip LC Bandpass Filters With Constant Bandwidth
TL;DR: In this paper, two-and three-pole microstrip LC constant fractional bandwidth (CFBW) and constant absolute bandwidth (CABW) tunable bandpass filters are proposed.
Journal ArticleDOI
Compact Balanced Dual- and Tri-Band BPFs Based on Coupled Complementary Split-Ring Resonators (C-CSRR)
TL;DR: In this paper, two multi-band balanced bandpass filters (BPFs) are proposed by embedding multiband coupled complementary split-ring resonators (C-CSRRs) into a balanced stepped-impedance microstrip-slotline transition structure.
Journal ArticleDOI
Tunable Bandpass Filter With Independently Controllable Dual Passbands
TL;DR: In this paper, a two-pole dual-band tunable bandpass filter (BPF) with independently controllable dual passbands based on a novel tunable dual-mode resonator is presented.
Journal ArticleDOI
Bandwidth Enhancement of Asymmetric Coplanar Waveguide (ACPW)-Fed Antenna Based on Composite Right/Left-Handed Transmission Line
Bing-Jian Niu,Quanyuan Feng +1 more
TL;DR: In this article, a wideband antenna based on composite right/left-handed transmission line (CRLH-TL) is presented, where the zeroth-order and first-positive-order modes are closely spaced and merged together.
References
More filters
Journal ArticleDOI
Dual-Mode Microstrip Open-Loop Resonators and Filters
TL;DR: In this article, a miniature dual-mode microstrip open-loop resonator is proposed, and its properties are investigated using full-wave electromagnetic simulations, and it is shown that the two operating modes within a single dualmode resonator of this type do not couple.
Journal ArticleDOI
Tunable combline filter with continuous control of center frequency and bandwidth
TL;DR: In this article, a new combline filter structure with a continuous tunability for both the center frequency and bandwidth is presented, which is achieved by placing variable coupling reducers between the filter resonators.
Journal ArticleDOI
New compact bandpass filter using microstrip /spl lambda//4 resonators with open stub inverter
TL;DR: In this article, a bandpass filter using microstrip quarter-wavelength resonators is proposed, which consists of the open stub inverter between quarter wavelength resonators, which results in a compact design and low loss.
Journal ArticleDOI
Low-Loss Two-Pole Tunable Filters With Three Different Predefined Bandwidth Characteristics
Sang-June Park,Gabriel M. Rebeiz +1 more
TL;DR: In this paper, a planar tunable filter with three different fractional-bandwidth variations was designed and fabricated on epsivr = 2.2, 0.787 mm Duroid substrates for 850-1400 MHz applications.
Journal ArticleDOI
Varactor-Tuned Dual-Mode Bandpass Filters
Wenxing Tang,Jia-Sheng Hong +1 more
TL;DR: In this article, a new type of varactor-tuned dual-mode bandpass filter is presented, where the odd and even modes do not couple to each other, and the tuning of the passband frequency becomes simple with a single dc-bias circuit while keeping nearly constant absolute bandwidth.