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Design Of Analog Cmos Integrated Circuits

In general, Micropower Impulse Radar (MIR) depends on Ultra-Wideband (UWB) transmission systems. UWB technology can supply innovative new systems and products that have an obvious value for radar and communications uses. Important applications include bridge-deck inspection systems, ground penetrating radar, mine detection, and precise distance resolution for such things as liquid level measurement. Most of these UWB inspection and measurement methods have some unique qualities, which need to be pursued. Therefore, in considering changes to Part 15 the FCC needs to take into account the unique features of UWB technology. MIR is applicable to two general types of UWB systems: radar systems and communications systems. Currently LLNL and its licensees are focusing on radar or radar type systems. LLNL is evaluating MIR for specialized communication systems. MIR is a relatively low power technology. Therefore, MIR systems seem to have a low potential for causing harmful interference to other users of the spectrum since the transmitted signal is spread over a wide bandwidth, which results in a relatively low spectral power density.

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Response to FCC 98-208 notice of inquiry in the matter of revision of part 15 of the commission's rules regarding ultra-wideband transmission systems

Resonance conditions for a substrate-superstrate printed antenna geometry which allow for large antenna gain are presented. Asymptotic formulas for gain, beamwidth, and bandwidth are given, and the bandwidth limitation of the method is discussed. The method is extended to produce narrow patterns about the horizon, and directive patterns at two different angles.

Gain enhancement methods for printed circuit antennas

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Design Of Integrated Circuits For Optical Communications

This expanded and thoroughly revised edition of Thomas H. Lee's acclaimed guide to the design of gigahertz RF integrated circuits features a completely new chapter on the principles of wireless systems. The chapters on low-noise amplifiers, oscillators and phase noise have been significantly expanded as well. The chapter on architectures now contains several examples of complete chip designs that bring together all the various theoretical and practical elements involved in producing a prototype chip. First Edition Hb (1998): 0-521-63061-4 First Edition Pb (1998); 0-521-63922-0

The Design of CMOS Radio-Frequency Integrated Circuits: RF CIRCUITS THROUGH THE AGES

In this paper, a novel pierced rectangular dielectric resonator antenna for wideband communication systems has been proposed. The effect of piercing array of square shaped slots and further, providing an air gap between dielectric resonator element and ground plane results in the lowering of `Q' factor and enhancement of the bandwidth S11 <; -10 dB because both are inversely related. Numerical analysis has been performed to find effective dielectric constant. The enhancement in bandwidth is from 9.8 % to 41 % at the resonant frequency of 3.3 GHz with the peak gain of 6.4 dBi. The mode excited is the fundamental TE111 mode. The proposed antenna finds application in various wideband communication systems falling in the range of 3.03 - 4.38 GHz.

http://ieeexplore.ieee.org/iel7/6729392/6740167/06740327.pdf

A novel pierced rectangular dielectric resonator antenna for wideband communication systems

A transition waveguide with corrugations is proposed to connect Virtual Cathode Oscillator (Vircator) to mode converter. The Transition is compact in size and overmoded transmission is possible with high efficiency. Such transition is useful for high power microwave sources, where output consists of TM01 and TE11 modes, and both modes need to be transmitted. The proposed waveguide is designed for S-band operation and connects 18 cm diameter Vircator output to 9 cm diameter input of the mode converter. The cosine profile results in smallest length of the waveguide with more than 90% transmission efficiency of TM01 and TE11 modes.

Design and simulation of transition waveguide to connect vircator to mode converter

Phase Noise optimization for RF oscillator using Design of Experiments (DOE) is presented. The constraint of keeping frequency deviation minimum is taken in to account by ANOVA and nominal-the-best approach of Taguchi methods. Phase Noise of the oscillator is improved by −3.6 dB with frequency deviation of 0.04 %. Power consumption is also reduced by 3.2 mW. 1

Optimizing Phase Noise of 2 GHz RF oscillator with minimum frequency deviation

A novel model for analyzing differential LC oscillator noise is presented. The proposed analysis enables us to separately compute the impacts of white and flicker noise on the oscillator phase noise in terms of simple analytical expressions. Further, the analysis also takes into account the contribution of the tail noise of a differential LC oscillator to the total phase noise. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 806–808, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21480

Novel modeling methodology of LC differential oscillator noise

A novel and compact dual band multiple input and multiple output (MIMO) antenna for Wireless Local Area Network (WLAN)(5.5 GH–5.85 GHz) band and International Telecommunications Union (ITU) (8.025 GHz–8.4 GHz) band is presented. Dual band characteristics are achieved by incorporating two slots in an aperture coupled micro strip patch resonator. The top radiating patch is designed such that effective length is guided half wavelength at 5.7 GHz for TM 01 mode. Second band at 8 GHz is obtained by introducing second slot on the ground plane. Mutual coupling between the two closely spaced elements of the MIMO antenna is reduced. Good isolation between the antenna elements is achieved (up to 40 dB). Fabricated prototype with optimized dimensions is measured to validate the obtained results.

Jayanta Mukherjee

Papers

A novel pierced rectangular dielectric resonator antenna for wideband communication systems

Design and simulation of transition waveguide to connect vircator to mode converter

Optimizing Phase Noise of 2 GHz RF oscillator with minimum frequency deviation

Novel modeling methodology of LC differential oscillator noise

Dual band aperture coupled MIMO antenna