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 37 for “"ISM Band"”.
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Antenna design for 2.4 GHz ISM band
The utilization of 2.4 GHz ISM band has experienced enormous growth in the last 5 years. A lot of research has been conducted on the design of antennas operating inside this band. The limited space on the circuit board for the RF module imposes a limit on the physical size available for the …
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Design and Prototyoing of a Wireless Data Transceiver in the 900MHz ISM Band
… rate attempts to travel the allotted channel bandwidth in the frequency band of interest. Also, limitations imposed by current radio transceiver technology tend to limit WDL design. The existing sponsor's wired system operates at a 9600 Baud, and presented the opposite problem: the data rate …
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Design and development of a frequency hopper based on the DECT system for the 902-928 MHz ISM band
… 15 rules for transmissions in the 902-928 MHz ISM band. A theoretical design of a slow frequency hopper (SFH) based on an existing DECT RF front end and a custom-designed system controller was developed. An innovative FH synchronization technique that eliminates the need for a separate FH …
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Physical Layer Design for a Spread Spectrum Wireless LAN
… design for a direct sequence spread spectrum ISM band radio LAN system. This radio system employs spread spectrum communication technology and a differential binary phase shift keying/quadrature phase shift keying (BPSK/QPSK) non-coherent receiver to overcome the adverse indoor wireless …
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Implantable ferrite antenna for biomedical applications
… around the Industrial, Scientific and Medical (ISM) band (2.4 – 2.5 GHz). The antenna is characterized in skin-mimicking gels and compared with simulation results. The experimental measurements are in good agreement with simulations, having a -16 dB reflection coefficient and -18 dBi realized …
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Dual band monopole antenna with harmonic suppression capability
… low profile applications. The use of GSM and the ISM band frequencies at the same time by different devices require multiple antenna to support more than two frequencies. Thus this states the requirement and demand for antenna with multiple frequencies of operation and capability. However …
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Performance Analysis Of Low-power, Short-range Wireless Transceivers
… 902-920 MHz, 2.4 GHz, all part of designated ISM band. Though, the wireless systems have become more reliable, compact and easy to develop than before, a detailed performance analysis and characterization of the devices should be done. This report details the performance analysis and …
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Interference Measurements and Throughput Analysis for 2.4 GHz Wireless Devices in Hospital Environments
… software reconfigurable measurement system (PRISM) to characterize the electromagnetic environment (EME) in hospitals. The portable measurement system has the flexibility to characterize a wide range of non-contiguous frequency bands and can be monitored from a remote location via the internet. …
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An energy efficient RF transceiver for wireless microsensor networks
… are made in both high frequency and baseband circuits to minimize the number of off-chip components and to achieve optimal energy efficiency. A thorough comparison of radio-frequency tuned and untuned gain stages shows that untuned gain can offer energy efficiency advantages in many …
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A wireless sensor network for smart roadbeds and intelligent transportation systems
… includes a custom-designed, compact, broadband, inexpensive printed circuit microstrip antenna for the 915 MHz U.S. ISM band. We built a prototype sensor package, and installed it in a pothole in a city street. We used the sensor to monitor the traffic flow rate during free-flowing traffic …
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Design and Development of Distributed Lower Atmospheric Instrumentation Packages
… is capable of simultaneous communication on the ISM band at ranges up to 100 km with multiple payloads. Second presented is a high-altitude balloon (HAB) instrumented platform capable of controlled slow descent. With open communication ports, this HAB bus can be used with any instrumentation an …
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Investigation, design and implementation of circular-polarised antennas for satellite mobile handset and wireless communications. Simulation and measurement of microstrip patch and wire antennas for handheld satellite mobile handsets and investigations of polarization polarity, specific absorption rate, and antenna design optimization using genetic algorithms.
… are investigated and discussed to operate at L band (1.61-1.6214GHz) and ISM band (2.4835-2.5GHz) A substantial size reduction was achieved compared to conventional designs by introducing special modifications to the antenna geometries. Most of the antennas are designed to produce …
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Continuous-Time Delta-Sigma Modulators for Ultra-Low-Power Radios
… (ULP) receiver operating in the 2.45 GHz ISM band. The main focus is on power saving techniques and jitter insensitive solutions. Papers I and II present a CT DSM with dual switched-capacitor-resistor (DSCR) feedback used in the first DAC. This technique has been developed for the purpose …
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Compact Doppler radar system for heart rate detection
… power and range for a functional 2.40Hz IMS band cardiopulmonary radar system were computed and measured, including free space losses, noise, and fundamental heart rate detection limits. The minimum required power for close range rate detection was also assessed. Heart rates for subjects …
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Measurements and models of radio frequency impulsive noise inside buildings
… receiver with 70 dB dynamic range and a 3-dB RF bandwidth of 40 MHz. Omni-directional and directional antennas were used to investigate the characteristics and sources of radio frequency noise in indoor channels. Statistical analyses of the measured data are presented in the form of amplitude …
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Channel modeling and interference rejection for CDMA automatic vehicle monitoring systems
… can exist in adjacent channels within the ISM band. It is demonstrated that using the realistic channel models the TDAF can provide substantial improvement in interference rejection over the conventional correlation receiver. Computationally efficient TDAF structures have been also proposed …
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Efficient Magnetic Resonance Wireless Power Transfer Systems
… within the chosen Industrial Scientific Medical (ISM) band. The impact of the connection type on the efficiency of wireless power transfer systems and the effect of the load impedance on each type was studied. Finally, an algorithm for intelligent management and control of received wireless power …
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Bluetooth technology
… and voice. It will operate in the unlicensed ISM band (industrial, scientific, and medical) with gross transfer rate up to lMbps and it will connect devices within a range of 10 or up to lOOm. The benefits of Bluetooth technology are twofold. First, it enables a user to replace the various …
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Architecture for ultra-low power multi-channel transmitters for Body Area Networks using RF resonators
… 3 FBAR-oscillator channels in the 2.4GHz ISM band was designed in a 65nm CMOS process. It operates from a 0.7V supply for the RF portion and 1V for the digital section. The transmitter achieves 1Mbps FSK, up to 10Mbps for OOK and BPSK without pulse shaping and 1Mbps for OOK and BPSK with …
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A Model-Based Approach to Demodulation of Co-Channel MSK Signals
… a problem for systems operating in unlicensed bands such as the 2.4 GHz ISM band and for narrowband systems that have been overlaid with spread spectrum systems. In this work we have developed model-based techniques for the demodulation of co-channel MSK signals. It is shown that MSK signals …
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