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 14 of 14 for “"bandstop"”.
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Synthesis, design, and fabrication techniques for reconfigurable microwave and millimeter-wave filters
… framework is developed for absorptive bandstop filters, a new class of bandstop filters which overcomes some of the limitations of traditional tunable bandstop filters caused by the use of lossy tunable resonators. This theory is used in conjunction with silicon-micromachining …
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Compensation technique for nonlinear distortion in RF circuits for multi-standard wireless systems
… used involves the design of novel microstrip bandstop filters which can block the interfering signals and hence give a clean output spectrum at the final stage. Recent years have seen the emergence of electronic band gap technology which has “band gap” properties meaning that a bandstop …
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Suppression of Limit Cycles in Digital Filters
… random dither, binary randan dither and bandstop dither. All the limit cycles in the second-order filter sections can be suppressed by the injection of any one of three dither signals. No remaining noise appears in the output from the filter in the zero-input condition. Experimental …
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Integrated Filter Antennas for Wireless Transceivers
… solutions. These include the integration of bandstop filters with ultra-wideband bandpass filters and within broadband antennas in order to reject some specific interfering frequency bands and the integration of bandpass filters with narrowband antennas in order to suppress frequency …
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The design and realisation of electronically tunable dielectric resonator microstrip filters
… for the design of both the bandpass and bandstop filters using these resonators. This necessitates the use of an accurate expression for the coupling coefficient which was derived by performing an electromagnetic analysis on the DR structure. This analysis also took into account the …
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Ultrawideband and Multi-state Reconfigurable Antennas with Sum and Difference Radiation Patterns
… two switchable and reconfigurable bandpass-to-bandstop filters are used to excite the antenna elements. The whole system is excited by an external commercially available rat-race coupler. In a next step, this design is modified to attain wideband, tunable bandpass, and tunable bandstop …
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Single-sided magnetic nanoparticles imaging scanner for early detection of breast cancer
… and concentration. Analogue Bandpass and Bandstop filters were designed for signal excitation and reception. Resovist and Perimag MNPs in liquid and immobilised form were used as tracer materials, which were moved to different spatial positions through the field of view (FOV), to record …
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Bandpass filter design with spurious frequency reduction capability
… shown the BPF with 2.99GHz cut off frequency and bandstop of to 7GHz has been simulated and fabricated on Flame Retardant 4 (FR4) substrate by using etching process. Significant spurious suppression up to 33.23dB is measured at 5.96GHz.
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Microwave chemical sensing using overmoded T-line designs and impact of real-time digitizer in the system
… and receive by implementing an absorptive bandstop filter to the system. This report demonstrates the possibility of a non-laboratory based implementation of a high resolution sensor.</p>
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Corrosion detection using metal coatings on fiber optic sensors
… optic sensors have demonstrated their ability as bandstop filters, by coupling the fundamental guided mode to circularly symmetric cladding modes. The cladding modes are extremely lossy due to the fiber jacket and bending along the fiber. Losses at discrete wavelengths can be monitored to …
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Development of planar filters and diplexers for wireless transceiver front ends
… of the stopband of bandpass filters using bandstop generating structures. The application of SIR, defected ground structures (DGS), spur-lines, and opencircuited stubs in the design of compact bandpass filters with improved stopband. - The application of the proposed filters and diplexers …
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Novel ECG analysis with application to atrial fibrillation detection
… filter is used to the effects of EMG noise and a bandstop notch filter is used to cope with PLI.;The pattern recognition unit comprises feature extraction process and classification process. In this research, some features from ECG signals are extracted to be used as the input vector for …
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Digital Filter Design Using Improved Artificial Bee Colony Algorithms
… of asymmetric lowpass, highpass, bandpass and bandstop FIR filters, and the results are compared to those obtained by the preference-based multiobjective differential evolution algorithm. The physical-programming-based multiobjective ABC algorithm is used to design IIR lowpass, highpass and …