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 62 for “"Passband"”.
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Design multilayer bandpass filter using hairpin resonator for digital broadcasting
… Filter is designed using Chebychev response with passband ripple of 0. 01 dB . Hairpin-line provides compact structures in the filter design . They can conceptually be obtained by folding the resonators of parallel-coupled half wavelength resonator into a “U” shape . This research will contribute …
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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
… bandwidth narrowing/ center frequency shift and passband impairments. Both were meant to model the effect of concatenating filters from a signal being transmitted through cascaded ROADMs. The real-time testing section was based around using a WaveLogic 3 real-time transceiver in QPSK mode. In …
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Optimal and Permissible Sampling Rates for First-Order Sampling of Two-Band Signals
… focuses on developing sampling methods for passband signals, which arises for broad-band signal processing, and it has drawn great interests in the DSP community. A first-order sampling method with optimal and total identification of all permissible sampling rates for two-band passband …
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Novel narrowband microstrip filters for wireless communications systems
… poles) disposed at either side of the passband were a function of the length of the open-ends relative to the feed-line. It was also discovered that the input/output feed-lines had to be located asymmetrically relative to each other to yield the desired bandpass response. The ‘C-shape’ …
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CPM Equalization to Compensate for ISI due to Band Limiting Channels
… the group-delay variations inside the channel passband using an FIR pre-filter. We assume the channel to be time-invariant and provide a method to design an FIR filter so that -when convolved with the band limiting filter - it results in more constant group-delay over the filter passband. …
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Gap Waveguide Array Element Filters
… 100 GHz with a bandwidth of 4 GHz and 20 dB of passband return loss that was used to develop several filter components for the other filter designs. The filter was integrated with a slotted waveguide antenna array and the effects of the coupling between adjacent filter channels was investigated. …
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Q-Enhanced LC Resonators for Monolithic, Low-Loss Filters in Gallium Arsenide Technology
… band. The best filter design achieves 0 dB of passband insertion loss while consuming 16 mA of current from a 3 V source (48 mW). Passband gain (up to 15 dB) can be achieved with increased bias current before instability is encountered. The filter provides more than 30 dB of rejection at 1.7 …
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Novel metamaterial frequency discriminating devices for next generation wireless communication systems
… such as sharp-cutoff frequency response, low passband insertion-loss and high return-Joss, high out-af-band rejection, compact size, low cost and ease of integration. The filters are approximately 70% smaller than their conventional counterparts. Analysis and mathematical modeling of these …
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Design of New, Compact and Efficient Microstrip Filters for 5G Wireless Communications
… in recent decades. New, compact and efficient passband filters with multi-functions and good performance are highly demanded in current and future wireless systems. This has also driven considerable technological advances in reconfigurable/tunable filter and filtering antenna designs. In light …
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Design of New, Compact and Efficient Microstrip Filters for 5G Wireless Communications
… in recent decades. New, compact and efficient passband filters with multi-functions and good performance are highly demanded in current and future wireless systems. This has also driven considerable technological advances in reconfigurable/tunable filter and filtering antenna designs. In light …
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Novel miniature microwave quasi-elliptical function bandpass filters with wideband harmonic suppression
… high return-loss and small group-delay in the passband are necessary to minimize signal degradation. A wide stopband is necessary to suppress spurious passbands outside the filter’s bandwidth that may allow spurious emissions from modulation process (harmonic, parasitic, intermodulation and …
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OWSS And MIMO-STC-OFDM: Signaling Systems for the Next Generation of High Speed Wireless LANs
… signal is also studied and simulations show that passband spectrum enjoys a 30-40% bandwidth advantage over OFDM. A novel pre-distortion scheme was developed to compensate for the passband PA non-linearity. Finally for OWSS, the fundamental limits of its system performance were also explored using …
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A new optimization approach to the design of one-dimensional and two-dimensional finite impulse response digital filters
… the squared error in both the stopband and the passband is minimized subject to constraints on the filter's stopband. The filter's coefficients can be calculated by solving a linear system of equations.
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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
… and laboratory experiments, tuning of the filter passband by 20 MHz is demonstrated. This investigation focuses on the design of a bandpass resonator using a combination of dielectric-ferrite material layers. An initial simplification of the geometry of the structure is used as the basis for a …
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High-speed modulation of resonant CMOS photonic modulators in deep-submicron bulk-CMOS
… energy per bit and to prevent the ring's optical passband from shifting to the next optical channel. A flexible driver test circuit for in-situ device characterization has been developed with a device-to-circuit modeling framework. There are many tradeoffs that must be analyzed from the system, …
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Switch capacitor filter design aids
… they track in their predictions of 1) increased passband ripple, 2) increased cutoff frequency, 3) increased third notch frequency, 4) increased OBR. On the basis of this comparison, it is not possible to determine if DIANA or TCAPS is the better program. However, both DIANA and TCAPS simulate …
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Transmission capacity improvement for high speed multimode waveguide links using advanced optical launch and multilevel modulation schemes
… optical fibre (SI-POF). Both baseband and passband multilevel modulation schemes are investigated to provide over gigabit/s transmissions using LEDs. For the first time, fractionally-spaced equalisers are thoroughly examined in multilevel modulation systems for LED-based SI-POF links. Based …
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Low-jitter symbol timing recovery for M-ary QAM and PAM signals
… double-sided band, suppressed-carrier (DSB-SC) passband signal centered at the Nyquist frequency (i.e., $1\over2$ of the symbol clock frequency). (Abstract shortened by UMI.)
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High-speed modulation of resonant CMOS photonic modulators in deep-submicron CMOS
… energy-per-bit and to prevent the ring's optical passband from shifting to the next optical channel. The second circuit topology drives a depletion-mode modulator device for high energy efficiency and speed. High-level system modeling is addressed, as well as practical considerations such as …
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Atmospheric responses to flare generated sunquakes
… observations of the Ca II 8542 Å and H-α 6563 Å passbands from the Swedish 1-m Solar Telescope (SST) were used in combination with space-based observations from the Heliosesimic and Magnetic Imager (HMI) onboard the Solar Dynamics Observatory (SDO). Both instruments observed wavefronts emanating …
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