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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

This work presents an implementation of Through-the-Earth two-way voice communication system helpful during the emergency conditions in underground mine. A metamaterial inspired electrically small antenna has been incorporated in our system for system miniaturization and to solve the portability issue without affecting the antenna efficiency and bandwidth. Simulations are done considering the electrical properties of various types of earthy materials to obtain the communication range. The safety limits for electromagnetic radiation hazard are also verified using a male-human body phantom.

Portable metamaterial inspired directional antenna for underground mine TTE communication

A novel and compact planar ultra wide band (UWB) filter is presented. Stepped impedance resonator (SIR) is used as multi mode resonator (MMR). MMR is fed by inter digital coupled lines. Coupled lines are designed such that to ensure low insertion loss over a wide frequency range. SIR (i.e., MMR) produces three resonant modes in the UWB frequency range ensures wide pass band. To avoid the potential interference caused by the co-existing wireless services is mitigated by incorporating band notch characteristics. In addition to UWB pass band, GSM 1800 band for GSM mobile communication with center frequency at 1850MHz is also achieved. Filter exhibits narrow pass band from 1800MHz to 1950MHz and UWB pass band from 3.5 GHz to 10 GHz with reference to 3 dB. At band notch frequency filter exhibits high attenuation level up to 40 dB and ensures less interference caused by co-existing wireless local area network (WLAN) band from 5.6 GHz to 5.9 GHz. GSM 1800 Band is obtained by loading shorted stub to the MMR without disturbing the UWB pass band response. S-parameters of the filter depict good UWB characteristics along with GSM 1800 pass band. Proposed filter is designed based on RT/Duroid 5880 substrate with dielectric constant 2.2 and thickness 0.785 mm. Proposed filter design is aimed to be a compact over reported UWB filter (i.e., surface area of 0.24λ 0 × 0.14λ 0 (Where λ 0 is the free space wavelength at the 6.85 GHz)).

Band notch UWB band pass filter with additional GSM 1800 band

This paper describes the use of the newly developed Cadence to ADS dynamic link in loadpull simulations for BiCMOS RFIC design in a University environment. The process described here helps a designer achieve an integrated design environment where both RF design and traditional VLSI design principles can be applied in an integrated manner.

RFIC loadpull simulations implementing best practice RF and mixed-signal design using an integrated agilent and cadence EDA tool

A compact symmetric/asymmetric CPW feed UWB antenna with polarization diversity characteristic is presented The proposed structure consists of two orthogonally placed UWB antennas One of the antenna elements in the proposed structure is feed with symmetric CPW feed while another antenna is feed with asymmetric CPW feed The proposed feeding techniques minimize the mutual coupling (≤ 20dB) between the antenna elements The proposed structure provides an impedance bandwidth of more than 10 GHz, which covers Bluetooth/Wi-Fi bands along with UWB bandwidth The transmission and diversity characteristics of the proposed antenna are measured and results are reported in terms of group-delay, transfer-function response, and Envelop-Correlation coefficient response A good agreement between simulated and measured results shows that the proposed antenna can be used for UWB diversity application

Symmetric/asymmetric CPW feed compact UWB antenna with polarization diversity characteristic

A novel and compact dual band partial ground coplanar waveguide (CPW) fed monopole modified elliptical antenna design is proposed. Dual band antenna is designed to cover both WLAN band at 2.4 GHz and WiMAX band at 3.5 GHz. Antenna exhibits good return loss characteristics in both the bands. Antenna is designed on RT/Duroid 5880 with dielectric constant 2.2, thickness 1.6 mm and loss tangent 0.0009 to improve the efficiency. Antenna parameters are optimized with respect to dual band characteristics. Based on these optimized parameters antenna prototype is fabricated. Radiation pattern of the proposed antenna is quasi semi-omnidirectional. Parallel agreement between simulated and measured results makes the proposed dual band antenna suitable candidate for modern wireless communication systems.

Jayanta Mukherjee

Papers

Portable metamaterial inspired directional antenna for underground mine TTE communication

Band notch UWB band pass filter with additional GSM 1800 band

RFIC loadpull simulations implementing best practice RF and mixed-signal design using an integrated agilent and cadence EDA tool

Symmetric/asymmetric CPW feed compact UWB antenna with polarization diversity characteristic

A novel and compact dual band antenna using modified elliptical ring monopole