Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 59 for “"Bandpass filter"”.
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Compact microstrip bandpass filter
In microwave communication systems, the bandpass filter is an essential component, which is usually used in both transmitter and receiver. Parallel-coupled microstrip bandpass filter is one of the most popular filters in communication systems. However, this arrangement of parallel-coupled …
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Bandpass filter design with spurious frequency reduction capability
Passband microstrip coupled line filter are widely used in daily microwave engineering practice. There are various topologies to implement microstrip bandpass filters such as end-coupled, parallel coupled, hairpin, interdigital and combine filters. This thesis discusses design, simulation, …
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Design multilayer bandpass filter using hairpin resonator for digital broadcasting
This research presents 2.52-2.65 GHz band-pass filter using multilayer hairpin resonator for digital broadcasting applications . Four-pole resonators are centered at 2.58 GHz with bandwidth of 130 MHz .This filter is simulated using Computer Simulation Technology software (CST) and Advance Design …
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Analysis of a composite dielectric-ferrite loaded resonator using the transmission line model with application to a tunable dual mode bandpass filter
A magnetically tuned filter is presented in this dissertation. Filter tuning of a dielectric ceramic resonator is accomplished using by using two oppositely biased ferrites. Specifically, a change in the applied magnetic field is used to alter the permeability of the ferrite so as to achieve …
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Reconfigurable RF front end: A mixer-first architecture and tunable filters
… receiver system and an on-chip tunable bandpass filter, are reviewed and verified. For the mixer-first receiver, a pure passive mixer called distributedly modulated capacitor (DMC) is introduced and analyzed, then simulation in ADS is reported, the results of which prove the capability …
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Delta-Sigma digital-RF modulation for high data rate transmitters
… high speed digital circuits and a passive LC bandpass filter, saving power and area compared to conventional IQ modulators for wideband systems. A prototype transmitter IC built in 0.13 pm CMOS demonstrates a data rate of 1.2 Gb/s using OFDM modulation in a bandwidth of 200 MHz centered at …
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Speech filtering for improving intelligibility in noisy transients
… utilizing an improved noise and power efficient bandpass filter bank to implement a novel frequency-selective gain control algorithm capable of reducing, and in some cases removing, loud transient noises, thereby improving speech intelligibility. This gain control algorithm takes advantage of the …
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Measurements, analysis and modeling of the performance of direct detection receivers with an optical preamplifier
… systems. In the preamplifier configuration, a bandpass filter is required to reduce the amplified spontaneous emission (ASE) noise in order to provide satisfactory bit error ratios (BER). In this thesis we examine the influence of the filter characteristics on performance. A model is derived to …
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Simplified Analysis of IMU Sensor Corruptions on Existing Pendulation Control System For Ship-Mounted Crane
… controllers. This study shows that an optional bandpass filter in the new control solution can reject a bias that appears in the estimated accelerometer data at the expense of higher sensitivity for the control. This study also shows that the velocity-based solution provides comparable if not …
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Photochemical Protection of Riboflavin and Tetrapyrroles with Light Scattering Technology
… or narrow bandwidth wavelength exposure, using filters allowing transmission at 25 nm wavebands at maximum peak height at 450, 550, or 650 nm. Riboflavin concentration was measured by HPLC over 8 hours of exposure. Increased TiO? load and thickness significantly affected riboflavin …
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Novel miniature microwave quasi-elliptical function bandpass filters with wideband harmonic suppression
Filters are integral components in all wireless communication systems, and their function is to permit predefined band of frequencies into the system and reject all other signals. The ever-growing demand in the use of the radio frequency (RF) spectrum for new applications has resulted in the need …
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Tunable compact microwave multiplexers based on substrate integrated waveguide
… presents a compact low-profile hybrid-coupled filter module (HCFM) implemented using substrate integrated waveguide (SIW). Compared to conventional rectangular waveguide HCFM, the new design achieves 60% reduction in size. The feasibility of electronic tuning of the HCFM is also investigated …
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Simulation of a binary phase shift keyed receiver with an IF correlator for position location
… of using an additional correlator after the IF bandpass filter which will correlate the IF waveform sample by sample so as to maintain the correlation peaks to better than 1% of the bit period.
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Cascaded ROADM Filter Replication and the Effects of Statistical Variations in the Response of Cascaded ROADMs on 100 Gb/s DP-QPSK System Performance
… thesis focuses on two distinct investigations: filter replications and the testing of a real-time system. The filter replication section used a Finisar WaveShaper programmable filter, a Yenista adjustable bandpass filter and a Luna Optical Vector Analyzer to adjust the input to the WaveShaper in …
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Nanophotonics for dark materials, filters, and optical magnetism
… on a graphene/dielectric stack, an ultraviolet bandpass filter formed with an aluminum/dielectric stack, and structures exhibiting homogenizable magnetic properties at infrared frequencies. The graphene stack can be treated as a effective, homogenized medium that can be designed to reflect …
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Method for theoretically determining the locus and location of the transmission zeros in microwave filter networks
… and negatively cross-coupled RF or microwave bandpass filter networks. Bandpass filters can be effectively designed by adjusting the locations of TZ's in the complex s-domain. To locate TZ's, this practical method uses chain matrices for subsystems (discrete parts of the network) of the filter …
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Novel narrowband microstrip filters for wireless communications systems
… extensively studied in this research project for filter applications in next generation wireless communication systems. Several novel microstrip bandpass filter structures have been introduced that meet the stringent requirements for high-performance (shaip-cutoff frequency response, low …
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Integration of microwave and millimeter wave bandpass filters with antennas
Filters and antennas are essential elements in communication and radar systems. In a conventional design, antennas and filters are designed independently and then connected together through transitions and/or connectors, which introduces loss and increases the size of the design. Filter and antenna …
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Coffee Queue Project
… Subtraction (ABS), blob tracking with Kalman filter, and occlusion resistive techniques are used to detect and track people. Additionally, a novel method using Dual Adaptive Background Subtractors (DABS) is implemented for dynamically determining the line region in a real-world crowded scene, …
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A circuit model BOSS simulation of nonlinear effects in long distance fiber optic systems
… The system mainly consists of a Butterworth bandpass filter which models the dispersion in the fiber and a VCO that imposes a phase modulation on the input signal thus modeling the intensity dependent phase shift due to SPM. By changing various parameters of the circuit, the dispersion …
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