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 21 for “"millimeter-wave frequencies"”.
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Terrestrial radio wave propagation at millimeter-wave frequencies
This research focuses on radio wave propagation at millimeter-wave frequencies. A measurement based channel characterization approach is taken in the investigation. First, measurement techniques are analyzed. Three types of measurement systems are designed, and implemented in measurement campaigns: …
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Millimeter-wave circuit design of coplanar integrated circuits and superconducting passive components
… communication links are being designed at millimeter-wave frequencies. To be commercially viable, these systems must be available at minimal cost to the telecommunication's provider.
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A 77GHz power amplifier in silicon germanium BiCMOS technology
The allocation of millimeter-wave frequencies has opened new possibilities for imaging applications such as vehicular radar and concealed weapons detection. Recent advances in silicon processes offer a new means of implementing cost-effective millimeter-wave integrated circuits, a field previously …
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Ion -Implanted GaAs MESFET MMICs for 77-Ghz Automotive Radar
… potential of ion-implanted MESFET technology at millimeter-wave frequencies.
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Electrodynamic Green's Functions in Layered Media: Accurate Closed -Form Approximations for Both Electric and Magnetic Sources
… Green's function over a very broad range of frequencies, thus making it suitable for applications ranging from radio wave propagation above Earth, to the design of planar microwave/millimeter-wave frequencies and of integrated optical waveguides. In addition, special attention was paid to …
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Compact device modeling and millimeter-wave oscillator design for III-V HBT technology
… traits that allow it to operate at high frequencies while still maintaining impressive breakdown, linearity, and current driving characteristics. These traits make it a highly desirable device for both millimeter-wave and high-speed mixed-signal circuits. However, as the complexity of the …
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Monte Carlo based channel estimation and evaluation for 5G millimeter-wave systems
Current wireless communications systems utilizing frequencies below 6 GHz are quickly becoming unable to meet consumer needs due to limited bandwidth. The need for ever increasing data throughput for wireless systems is pushing systems to begin using higher millimeter-wave frequencies to provide …
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Digital phase tightening for improved spatial resolution in millimeter-wave imaging systems
Imaging systems using millimeter-wave frequencies allow for the possibilities of vehicular radar and concealed weapons detection. By using silicon technology, the integration of millimeter-wave circuits can reach new levels that were previously impossible. This thesis discusses the challenge and …
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Demonstrating Reflectarray Behavior At Infrared
… developed and utilized at both RF and millimeter-wave frequencies. From the standpoint of an optical systems designer, adapting low-frequency reflectarray technology to develop a sub-millimeter and infrared reflectarray (SMIR) would provide a highly desirable alternative to similarly …
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Software-hardware systems for the Internet-of-Things
… Then, it presents Agile-Link and MoVR, new millimeter wave devices and protocols which address two main problems that prevent the adoption of millimeter wave frequencies in today's networks: signal blockage and beam alignment. Lastly, this thesis shows how these systems enable new IoT …
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Design and Implementation of an Ultrabroadband Millimeter-Wavelength Vector Sliding Correlator Channel Sounder and In-Building Multipath Measurements at 2.5 & 60 GHz
… data rates, they must operate at very high microwave and millimeter-wave frequencies, where large segments of spectrum are readily obtained. Unfortunately, little is known about the propagation characteristics at these frequencies and bandwidths. As a consequence, there has been a significant …
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Superdirectivity and the Application of Complementary Split Ring Resonators in Directivity Enhancement of Millimeter-Wave Antennas
The use of millimeter wave frequencies is extending to a variety of applications with the development of 5G/6G networks. Due to the small physical size in addition to atmospheric absorption and material losses, millimeter wave antennas suffer from low radiation performance. Motivated by this …
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Millimeter wave scattering by rain in an antenna's near field
… by rain can adversely affect a propagating wave in two ways. First, it results in attenuation and depolarization of the coherent field which is associated with the forward propagating wave. ln addition to this, random scattering gives rise to an incoherent field component that can further …
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Fixed Broadband Wireless Access Systems at Millimeter Wave Frequency
Millimeter radiowave systems offer an excellent means of creating a user and environment friendly scalable system that can be tailored economically as well as technically to small and large communities and provide a number of different services. In fact, the convergence of broadcast, communication …
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CMOS Power Device Modeling and Amplifier Circuits
… transmitter integrated circuits (ICs). At high frequencies, the distributed effect and power device-scaling issues put other constraints on PA design such as the trade-off between output power (Pout) and power added efficiency (PAE). Recently, CMOS has become attractive for low-cost and …
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Performance limits of RF power CMOS
… communications has prompted the exploration of millimeter-wave frequencies. Some of the applications in this regime include high-speed wireless local area networks and high data rate personal area networks at 60 GHz, automotive collision avoidance radar at 77 GHz and millimeter-wave imaging at …
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Silicon-based Microwave/Millimeter-wave Monolithic Power Amplifiers
… interest in exploring high frequency (mm-wave) spectrum (particularly the 30 and 60 GHz ranges), and utilizing silicon-based technology for reduced-cost monolithic millimeter integrated circuits (MMIC), for applications such as WLAN, inter-vehicle communication (IVC) automotive radar and …
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Experimental study of a high efficiency step-tunable MW gyrotron oscillator
… capable of producing megawatt power levels at millimeter-wave frequencies for many important applications, including electron cyclotron heating and current drive in magnetic fusion devices. It is important that the gyrotron operates with high efficiency and provides a high quality output beam …
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Micromachined transmission lines for microwave applications
… lines is performed directly on-wafer with microwave coplanar probes. The S-parameters of the strip lines are measured with frequencies of up to the millimeter-wave range (48 GHz). Based on these measurements the transmission line properties of the strip line are analyzed and the corresponding …
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Integrated Wideband Self-Interference Cancellation Techniques for FDD and Full-Duplex Wireless Communication
… using large bandwidths available at mmWave frequencies. The advantages, challenges and achievements associated with the two proposed techniques will be described in the following paragraphs. First, in-band full-duplex communication potentially increases spectral efficiency within …
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