A fully reconfigurable bandpass‐to‐notch filter with wide bandwidth tuning range based on external quality factor tuning and multiple‐mode resonator

2019 ◽  
Vol 61 (5) ◽  
pp. 1253-1258 ◽  
Author(s):  
BoZhang Lan ◽  
Yan Qu ◽  
ChenJiang Guo ◽  
Jun Ding
Keyword(s):  
Quality Factor ◽  
Tuning Range ◽  
Notch Filter ◽  
External Quality ◽  
Wide Bandwidth ◽  
Multiple Mode ◽  
Bandwidth Tuning ◽  
Mode Resonator

A fully reconfigurable bandpass-to-bandpass-with-embedded-stopband filter with an ultra-wide 0.09–1.41 GHz bandwidth tuning range

2019 ◽  
Vol 11 (9) ◽  
pp. 899-908
Author(s):  
Bo-Zhang Lan ◽  
Yan Qu ◽  
Chen-Jiang Guo ◽  
Jun Ding
Keyword(s):  
Quality Factor ◽  
Tuning Range ◽  
Frequency Tuning ◽  
Center Frequency ◽  
External Quality ◽  
Transmission Zeros ◽  
Multiple Mode ◽  
Bandwidth Tuning ◽  
Fixed Center ◽  
Mode Resonator

AbstractA varactor-based fully reconfigurable microstrip bandpass-to-bandpass-with-embedded-stopband filter is presented in this paper. This filter offers wide center frequency and bandwidth tuning flexibility under both bandpass mode and bandpass-with-embedded-stopband mode. The entire tuning ability is based on multiple mode resonator theory and external quality factor tuning structure for bandpass mode and the introduction of transmission zeros (TZs) for bandpass-with-embedded-stopband mode. Under the bandpass mode, the center frequency tuning range is 0.96–1.45 GHz and the bandwidth can be tuned from 0.09 to 1.41 GHz with a fixed center frequency at 1.22 GHz. Under bandpass-with-embedded-stopband mode, the center frequency and bandwidth can be tuned from 0.94 to 1.61 GHz and 0.2–0.33 GHz, respectively. Good agreements are shown between simulated and measured results.

Design of 6-gon-Shaped Notch Filter for Cognitive Radio Applications

2018 ◽  
Vol 27 (06) ◽  
pp. 1850085
Author(s):  
A. Uma Maheswari ◽  
K. Latha
Keyword(s):  
Cognitive Radio ◽  
Return Loss ◽  
Group Delay ◽  
Bandpass Filter ◽  
Narrow Band ◽  
Notch Filter ◽  
Structural Features ◽  
Fractional Bandwidth ◽  
Multiple Mode ◽  
Mode Resonator

This paper presents a 6-gon-shaped bandpass and notch filters for Cognitive Radio (CR) applications. The bandpass filter consists of a 6-gon-shaped multiple mode resonator with interdigital coupling at both ends. The notch filter is derived from bandpass filter by embedding four identical Embedded Open Stubs (EOS) nearby the multiple mode resonators that introduce narrow band suppression in the desired passband. Such bandpass filter with notching band is required in practical CR systems in order to effectively sense the spectrum and avoid the interference between the systems working in same environment with the same frequency. The filter is simulated using an electromagnetic solver, IE3D. The group delay obtained for bandpass filter is below 0.2[Formula: see text]ns. With the above structural features, the overall dimension of the filter is [Formula: see text][Formula: see text]mm2 and the fractional bandwidth (FBW) of the proposed bandpass filter is more than 100% with optimal performances in terms of insertion loss, return loss, group delay and phase.

scholarly journals Bandwidth Tunable Optical Bandpass Filter Based on Parity-Time Symmetry

Micromachines ◽  
2022 ◽  
Vol 13 (1) ◽  
pp. 89
Author(s):  
Bowen Zhang ◽  
Nuo Chen ◽  
Xinda Lu ◽  
Yuhang Hu ◽  
Zihao Yang ◽  
...  
Keyword(s):  
Wavelength Division Multiplexing ◽  
Tuning Range ◽  
Extinction Ratio ◽  
Optical Filter ◽  
Optimized Design ◽  
Coupling Coefficients ◽  
Large Bandwidth ◽  
Time Symmetry ◽  
Bandwidth Tuning ◽  
Band Pass

A chip-scale tunable optical filter is indispensable to meeting the demand for reconfigurability in wavelength division multiplexing systems, channel routing, and switching, etc. Here, we propose a new scheme of bandwidth tunable band-pass filters based on a parity-time (PT) symmetric coupled microresonator system. Large bandwidth tunability is realized on the basis of the tuning of the relative resonant frequency between coupled rings and by making use of the concept of the exception point (EP) in the PT symmetric systems. Theoretical investigations show that the bandwidth tuning range depends on the intrinsic loss of the microresonators, as well as on the loss contrast between the two cavities. Our proof-of-concept device confirms the tunability and shows a bandwidth tuning range from 21 GHz to 49 GHz, with an extinction ratio larger than 15 dB. The discrepancy between theory and experiment is due to the non-optimized design of the coupling coefficients, as well as to fabrication errors. Our design based on PT symmetry shows a distinct route towards the realization of tunable band-pass filters, providing new ways to explore non-Hermitian light manipulation in conventional integrated devices.

MEMS-based LC tank with extended tuning range for low phase-noise VCO

2015 ◽  
Vol 9 (2) ◽  
pp. 249-258 ◽  
Author(s):  
Alessandro Cazzorla ◽  
Paola Farinelli ◽  
Laura Urbani ◽  
Fabrizio Cacciamani ◽  
Luca Pelliccia ◽  
...  
Keyword(s):  
Phase Noise ◽  
Quality Factor ◽  
Ohmic Contacts ◽  
Tuning Range ◽  
Design System ◽  
High Resistivity ◽  
Continuous Tuning ◽  
5 Ghz ◽  
Lc Tank ◽  
Low Phase Noise

This paper presents the modeling, manufacturing, and testing of a micro-electromechanical system (MEMS)-based LC tank resonator suitable for low phase-noise voltage-controlled oscillators (VCOs). The device is based on a variable MEMS varactor in series with an inductive coplanar waveguide line. Two additional parallel stubs controlled by two ohmic MEMS switches have been introduced in order to increase the resonator tunability. The device was fabricated using the FBK-irst MEMS process on high resistivity (HR) silicon substrate. Samples were manufactured with and without a 0-level quartz cap. The radio frequency characterization of the devices without 0-level cap has shown a continuous tuning range of 11.7% and a quality factor in the range of 33–38. The repeatability was also tested on four samples and the continuous tuning is 11.7 ± 2%. Experimental results on the device with a 0-level cap, show a frequency downshift of about 200 MHz and a degradation of the quality factor of about 20%. This is, most likely, due to the polymeric sealing ring as well as to a contamination of the ohmic contacts introduced by the capping procedure. A preliminary design of a MEMS-based VCO was performed using Advanced Design System and a hardwired prototype was fabricated on Surface Mount Technology on RO4350 laminate. The prototype was tested resulting in a resonance frequency of 5 GHz with a phase noise of −105 and −126 dBc at 100 KHz and 1 MHz, respectively, and a measured output power of −1 dBm.

A Compact Wideband Microstrip Filter Using Folded Multiple-Mode Resonator

2009 ◽  
Vol 19 (5) ◽  
pp. 287-289 ◽  
Author(s):  
Huan Wang ◽  
Qing-Xin Chu ◽  
Jian-Qiang Gong
Keyword(s):  
Microstrip Filter ◽  
Multiple Mode ◽  
Mode Resonator

Wideband dipole antenna using multiple‐mode resonator for long‐term evolution application

2015 ◽  
Vol 51 (25) ◽  
pp. 2074-2076 ◽  
Author(s):  
Yu‐Fa Zheng ◽  
Sai‐Wai Wong ◽  
Qi‐Kai Huang ◽  
Kai Wang ◽  
Lei Zhu ◽  
...  
Keyword(s):  
Long Term Evolution ◽  
Dipole Antenna ◽  
Term Evolution ◽  
Multiple Mode ◽  
Mode Resonator
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