The Experts below are selected from a list of 15624 Experts worldwide ranked by ideXlab platform
Gabriel M. Rebeiz - One of the best experts on this subject based on the ideXlab platform.
-
bandpass to bandstop reconfigurable Tunable Filters with frequency and bandwidth controls
IEEE Transactions on Microwave Theory and Techniques, 2017Co-Authors: Tao Yang, Gabriel M. RebeizAbstract:A novel method is proposed for designing bandpass-to-bandstop reconfigurable Tunable Filters. The proposed method employs standard bandpass and bandstop design theory which does not require complex coupling synthesizing process, and can be applied for arbitrary-order bandpass-to-bandstop reconfigurable Filters with both frequency and bandwidth control. Second-order and third-order bandpass-to-bandstop reconfigurable Filters from 2 to 2.7 GHz were built to demonstrate the proposed method. The Filters offer wide frequency and bandwidth tuning flexibility in both bandpass and bandstop modes, and occupy an area smaller than 20 mm $\times20$ mm on a substrate with relative dielectric constant $\varepsilon _{r}= 10.8$ substrate. Theory and measured results are presented with good agreement.
-
Tunable 4-Pole Noncontiguous 0.7–2.1-GHz Bandpass Filters Based on Dual Zero-Value Couplings
IEEE Transactions on Microwave Theory and Techniques, 2015Co-Authors: Gabriel M. RebeizAbstract:This paper presents Tunable 2- and 4-pole bandpass Filters with a wide tuning range based on dual zero-value couplings. The zero-value coupling is achieved using a coupled line with two coupling paths. The proposed filter also has bandwidth tunability. Frequency and bandwidth tunings are achieved using silicon varactor diodes. Three types of Tunable Filters are designed and built on a substrate with $\varepsilon_{ r} = 3.55$ and $h = 25$ mil, two Filters with two separate frequency bands (2- and 4-pole: Filter A) and one filter with contiguous frequency tuning (4-pole: Filter B). The 2-pole filter results in an insertion loss of 2.9–4.7 dB with a tuning range of 0.75–1.09 and 1.70–2.18 GHz. Filter A with a 4-pole response results in an insertion loss 3.7–7.9 dB and a ${-}{\hbox{1}}$ -dB bandwidth of 68–87 MHz with a tuning ranges of 0.77–1.10 and 1.70–2.10 GHz. Filter B shows an insertion loss of 4.4–6.6 dB and a ${-}{\hbox{1}}$ -dB bandwidth of 39–68 MHz with a tuning range of 0.70–1.44 GHz. The application areas are in wideband Tunable Filters requiring contiguous and noncontiguous frequency coverage with bandwidth tunability in separate bands.
-
compact self shielded 2 3 ghz high q coaxial fixed and Tunable Filters
IEEE Transactions on Microwave Theory and Techniques, 2014Co-Authors: Tao Yang, Kevin Mingjiang Ho, Gabriel M. RebeizAbstract:A novel coaxial stepped-impedance resonator (SIR) filter is proposed based on conventional multi-layer printed-circuit board (PCB) technology. The resonator results in a measured unloaded quality factor (Qu) of 185 at 3.7 GHz, has compact size, is self-shielded and has very low electromagnetic (EM) coupling to nearby RF circuits. The 3-D filter topology easily lends to advanced filter design with multiple transmission zeroes using cross coupling and source-to-load coupling on the top printed-circuit board layer. Two third-order fixed-band bandpass Filters, and two fourth-order Tunable bandpass Filters are demonstrated in this technology. The fixed-band Filters have an insertion loss of 1.6 dB with a fractional bandwidth of 6.5% at 3.6 GHz and occupy a size of 9 × 12 mm 2 . The Tunable filter covers 2.1-2.9 GHz with a fractional bandwidth of 3.5%, and an insertion loss of 4.2-9.2 dB, limited by the silicon varactors. Multiple transmission zeroes are used in these designs to significantly improve the filter selectivity. Application areas are in fixed and Tunable Filters with very compact size and high shielding from nearby circuits for advanced communication systems.
-
high performance 1 5 2 5 ghz rf mems Tunable Filters for wireless applications
IEEE Transactions on Microwave Theory and Techniques, 2010Co-Authors: Mohammed A Eltanani, Gabriel M. RebeizAbstract:This paper presents high-performance RF microelectromechanical systems (RF MEMS) Tunable Filters with constant absolute bandwidth for the 1.5-2.5-GHz wireless band. The filter design is based on corrugated coupled lines and ceramic substrates (er=9.9) for miniaturization, and the 3-bit tuning network is fabricated using a digital/analog RF-MEMS device so as to provide a large capacitance ratio and continuous frequency coverage. Narrowband (72 ± 3 MHz) and wideband (115 ± 10 MHz) 1-dB bandwidth two-pole Filters result in a measured insertion loss of 1.9-2.2 dB at 1.5-2.5 GHz with a power handling of 25 dBm and an IIP3 >> 33 dBm. The Filters also showed no distortion when tested under wideband CDMA waveforms up to 24.8 dBm. The designs can be scaled to higher dielectric-constant substrates to result in smaller Filters. To our knowledge, these Filters represent the state-of-the-art at this frequency range using any planar tuning technology.
-
corrugated microstrip coupled lines for constant absolute bandwidth Tunable Filters
IEEE Transactions on Microwave Theory and Techniques, 2010Co-Authors: M A Eltanani, Gabriel M. RebeizAbstract:This paper presents corrugated coupled lines for miniaturized fixed and Tunable microstrip bandpass Filters. The novel approach uses microstrip corrugated coupled-line concept to synthesize a coupling coefficient, which maintains a nearly constant absolute bandwidth across the tuning range. A miniaturized two-pole varactor tuned filter is demonstrated with 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 tuning range. In addition, a three-pole comb-line 4.7% fixed filter at 1.94 GHz shows a 3:1 resonator spacing reduction over the conventional approach with an insertion loss of only 1.1 dB. This technique will allow the design of miniaturized small bandwidth fixed and Tunable microstrip Filters.
K.w. Cheung - One of the best experts on this subject based on the ideXlab platform.
-
acoustooptic Tunable Filters in narrowband wdm networks system issues and network applications
IEEE Journal on Selected Areas in Communications, 1990Co-Authors: K.w. CheungAbstract:The system issues and network applications of acoustooptic Tunable Filters (AOTFs) are discussed. AOTFs are thought to be attractive system components in dense wavelength-division multiplexed (WDM) networks because of their broad continuous electronic wavelength tunability and narrow filter bandwidth. Their unique multiwavelength filtering capability adds a greater dimension of flexibility to network design. The characteristics of the AOTF are reviewed from a system viewpoint and the performance and capabilities of bulk-devices, integrated-optic devices, and fiber-based devices are discussed and compared. Three network applications using the acoustooptic Tunable Filters are described. The first application is as wavelength-Tunable receivers or taps for local users in a subscriber loop distribution network. The second is as multiwavelength Tunable receivers in a broadcast local-area cross-connect for packet communication with very-high-throughput data rate. The third is as wavelength-selective space-division switch fabric for routing and cross-connect between central offices. Future prospects and various issues for future research are also discussed. >
-
integrated optic acoustically Tunable Filters for wdm networks
IEEE Journal on Selected Areas in Communications, 1990Co-Authors: D. A. Smith, J.e. Baran, J.j. Johnson, K.w. CheungAbstract:Recent advances in fully integrated acoustically tuned optical Filters (ATOFs) for use in wavelength-division multiplexing (WDM) are reviewed. Experiments in parallel processing of wavelength channels are described. The ATOF uses the photoelastic effect induced by a surface acoustic wave (SAW) to flip the polarization state of a narrow phase-matched band of wavelengths. A unique feature of the ATOF is that many wavelengths can be simultaneously and independently processed, because the associated SAW beams can be superimposed with negligible interaction at the drive levels required for complete polarization conversion. This parallel processing capability has been used to select as many as five out of eight laser channels in an experiment in which each channel was tagged by a separate microwave subcarrier. Polarization-independent devices are also discussed. A polarization-diversity ATOF that decomposes an input beam into TE (horizontal) and TM (vertical) components, interchanges TE and TM roles for the resonant wavelength, and reroutes the filtered beam into a spatially distinct port is described. >
-
Wavelength-selective circuit and packet switching using acousto-optic Tunable Filters
Global Telecommunications Conference 1990 and Exhibition. 'Communications: Connecting the Future' GLOBECOM '90. IEEE, 1990Co-Authors: K.w. Cheung, J.e. Baran, D. A. Smith, J.j. JohnsonAbstract:Wavelength-selective circuit and packet switching applications of acoustooptic Tunable Filters (AOTFs) in wavelength-division multiplexing (WDM) networks are discussed. For circuit switching applications, the AOTFs are used as 1 times;2 or 2 times;2 wavelength-selective space-division switches. It is shown how large switches can be built from these basic building blocks both schematically and physically. Such switch fabric can be used for routing and cross connect between central offices. For packet switching applications, the AOTFs are used as wavelength-Tunable receivers in a broadcast and select cross-connect configuration. It is shown how such a configuration can accomplish packet communication with high throughput. Various system issues are also discussed
Dimitrios Peroulis - One of the best experts on this subject based on the ideXlab platform.
-
Tunable Filter Technologies for 5G Communications
2018 IEEE International Electron Devices Meeting (IEDM), 2018Co-Authors: Dimitrios PeroulisAbstract:This paper presents an overview of available technologies for manufacturing three-dimensional front-end Tunable Filters for 5G systems. Specifically, we discuss three main technologies: a) RF MEMS, b) Printed Circuit Board (PCB), and c) injection molding. The advantages and drawbacks of each technology are discussed along with relevant proof-of-concept demonstrations. Future directions and improvements are also presented.
-
handling rf power the latest advances in rf mems Tunable Filters
IEEE Microwave Magazine, 2013Co-Authors: Pierre Blondy, Dimitrios PeroulisAbstract:RF-MEMS technology permits practical implementations of high-Q (Q from 300 to over 1,000) Tunable microwave Filters with power handling in the >;1-10 W range, with significant tuning range (>;50% to 100%), and ultra-low power consumption. Continuously frequency-Tunable Filters with mechanical actuation in the opposite direction of RF-inducted pressure can reach powers up to several watts, using a variable compensation bias. Very high Q, and large tuning range can be achieved with this technology, both in planar and cavity Tunable Filters. Using several devices in parallel, RF-MEMS capacitor arrays can handle RF-powers better than 1 watt, without the need for any compensation tuning.
-
System-level characterization of bias noise effects on electrostatic RF MEMS Tunable Filters
2011 IEEE 24th International Conference on Micro Electro Mechanical Systems, 2011Co-Authors: Kenle Chen, William J. Chappell, Linda P. B. Katehi, Dimitrios PeroulisAbstract:This paper presents the first system-level characterization of the effects of bias noise on the performance of high-Q electrostatic RF MEMS Tunable Filters. By looking at the system-level performance of such a Tunable filter, this paper shows that bias noise, if not well controlled, can degrade the RF performance of the Tunable filter. Quantified by error vector magnitude measurement, such system level degradation due to bias noise is found to be dependent on the frequency and amplitude of the noise signals.
-
Antibiased electrostatic RF MEMS varactors and Tunable Filters
IEEE Transactions on Microwave Theory and Techniques, 2010Co-Authors: Kenle Chen, Andrew Kovacs, Xiaoguang Liu, William J. Chappell, Dimitrios PeroulisAbstract:This paper presents a new approach for substantially enhancing the linearity and reducing the effects of bias noise for electrostatic RF microelectromechanical systems (MEMS) devices. The proposed method relies on applying bias voltages with opposite polarities to cancel the dynamic vibration of the MEMS structures. In this paper, the method has been applied to a shunt RF MEMS varactor and a MEMS Tunable evanescent-mode Tunable filter. In the first case, the shunt MEMS varactor is split into two identical parts that are biased with opposite voltages. This results in almost complete cancelation of the odd-order modulation components, leading to 20-28-dB linearity enhancement depending on the noise and the design. Analytical results, a computer-aided design model and measurements validate the proposed approach. In the Tunable filter case, opposite bias voltages are applied on the tuners of its resonators. Simulated and measured results are also presented in this case. Measurements show a sideband reduction as high as 13 dB. In both cases, the effectiveness of the proposed method in the presence of fabrication uncertainties are also considered.
-
MEMS devices for high isolation switching and Tunable filtering
2000 IEEE MTT-S International Microwave Symposium Digest (Cat. No.00CH37017), 2000Co-Authors: Dimitrios Peroulis, S.p. Pacheco, Kamal Sarabandi, P.b. KatehiAbstract:This paper presents resonant capacitive microelectromechanical switches and their possible applications in Tunable filtering. Single switches with a down capacitance of 2.9 pF and inductive sections of 3 to 50 pH are demonstrated, resulting in resonant frequencies from 13 to 54 GHz. Designs of resonant switches connected in parallel are also implemented with major advantages in isolation and bandwidth. Finally, Tunable Filters using these switches are discussed.
J.j. Johnson - One of the best experts on this subject based on the ideXlab platform.
-
integrated optic acoustically Tunable Filters for wdm networks
IEEE Journal on Selected Areas in Communications, 1990Co-Authors: D. A. Smith, J.e. Baran, J.j. Johnson, K.w. CheungAbstract:Recent advances in fully integrated acoustically tuned optical Filters (ATOFs) for use in wavelength-division multiplexing (WDM) are reviewed. Experiments in parallel processing of wavelength channels are described. The ATOF uses the photoelastic effect induced by a surface acoustic wave (SAW) to flip the polarization state of a narrow phase-matched band of wavelengths. A unique feature of the ATOF is that many wavelengths can be simultaneously and independently processed, because the associated SAW beams can be superimposed with negligible interaction at the drive levels required for complete polarization conversion. This parallel processing capability has been used to select as many as five out of eight laser channels in an experiment in which each channel was tagged by a separate microwave subcarrier. Polarization-independent devices are also discussed. A polarization-diversity ATOF that decomposes an input beam into TE (horizontal) and TM (vertical) components, interchanges TE and TM roles for the resonant wavelength, and reroutes the filtered beam into a spatially distinct port is described. >
-
Wavelength-selective circuit and packet switching using acousto-optic Tunable Filters
Global Telecommunications Conference 1990 and Exhibition. 'Communications: Connecting the Future' GLOBECOM '90. IEEE, 1990Co-Authors: K.w. Cheung, J.e. Baran, D. A. Smith, J.j. JohnsonAbstract:Wavelength-selective circuit and packet switching applications of acoustooptic Tunable Filters (AOTFs) in wavelength-division multiplexing (WDM) networks are discussed. For circuit switching applications, the AOTFs are used as 1 times;2 or 2 times;2 wavelength-selective space-division switches. It is shown how large switches can be built from these basic building blocks both schematically and physically. Such switch fabric can be used for routing and cross connect between central offices. For packet switching applications, the AOTFs are used as wavelength-Tunable receivers in a broadcast and select cross-connect configuration. It is shown how such a configuration can accomplish packet communication with high throughput. Various system issues are also discussed
D. A. Smith - One of the best experts on this subject based on the ideXlab platform.
-
Use of the acousto-optic Tunable filter for optical spectrum analysis and EDFA power equalization in WDM systems
Optical Fiber Communications OFC., 1996Co-Authors: M.l. Heston, D. A. Smith, A. Khaydarov, A.e. Willner, S.-m. Hwang, S.h. HuangAbstract:Summary form only given. In order to use a cascade of erbium-doped fiber amplifiers (EDFAs) in a wavelength-division multiplexing (WDM) system, the power output of the signal channels must be equalized. We demonstrate a system for power equalization that consists of two single-stage acousto-optical Tunable Filters (AOTFs). To our knowledge, this is the first use of the AOTF as an optical spectrum analyzer in a WDM system.
-
gain equalization multiwavelength lightwave systems using acoustooptic Tunable Filters
IEEE Photonics Technology Letters, 1992Co-Authors: S F Su, D. A. Smith, R Olshansky, G Joyce, J.e. BaranAbstract:An acoustooptic Tunable filter is used to compensate for the gain spectrum variations in multiwavelength lightwave systems containing cascaded fiber amplifiers. Demonstrations of such systems using a circulating loop containing a fiber amplifier and an acoustooptic Tunable filter have shown that differential gain compensations of up to 14 dB can be achieved for two arbitrary injected wavelengths. >
-
integrated optic acoustically Tunable Filters for wdm networks
IEEE Journal on Selected Areas in Communications, 1990Co-Authors: D. A. Smith, J.e. Baran, J.j. Johnson, K.w. CheungAbstract:Recent advances in fully integrated acoustically tuned optical Filters (ATOFs) for use in wavelength-division multiplexing (WDM) are reviewed. Experiments in parallel processing of wavelength channels are described. The ATOF uses the photoelastic effect induced by a surface acoustic wave (SAW) to flip the polarization state of a narrow phase-matched band of wavelengths. A unique feature of the ATOF is that many wavelengths can be simultaneously and independently processed, because the associated SAW beams can be superimposed with negligible interaction at the drive levels required for complete polarization conversion. This parallel processing capability has been used to select as many as five out of eight laser channels in an experiment in which each channel was tagged by a separate microwave subcarrier. Polarization-independent devices are also discussed. A polarization-diversity ATOF that decomposes an input beam into TE (horizontal) and TM (vertical) components, interchanges TE and TM roles for the resonant wavelength, and reroutes the filtered beam into a spatially distinct port is described. >
-
Wavelength-selective circuit and packet switching using acousto-optic Tunable Filters
Global Telecommunications Conference 1990 and Exhibition. 'Communications: Connecting the Future' GLOBECOM '90. IEEE, 1990Co-Authors: K.w. Cheung, J.e. Baran, D. A. Smith, J.j. JohnsonAbstract:Wavelength-selective circuit and packet switching applications of acoustooptic Tunable Filters (AOTFs) in wavelength-division multiplexing (WDM) networks are discussed. For circuit switching applications, the AOTFs are used as 1 times;2 or 2 times;2 wavelength-selective space-division switches. It is shown how large switches can be built from these basic building blocks both schematically and physically. Such switch fabric can be used for routing and cross connect between central offices. For packet switching applications, the AOTFs are used as wavelength-Tunable receivers in a broadcast and select cross-connect configuration. It is shown how such a configuration can accomplish packet communication with high throughput. Various system issues are also discussed
