Search Results - "Hall, Leonard"

A K -Band Frequency Doubler With 35-dB Fundamental Rejection Based on Novel Transformer Balun in 0.13- \mu \text SiGe Technology by Chakraborty, Sudipta, Milner, Leigh E., Xi Zhu, Hall, Leonard T., Sevimli, Oya, Heimlich, Michael C.

“…A compact balanced frequency doubler with more than 35 dB odd-harmonic rejection and fractional bandwidth of 73% is presented in this letter. Wide bandwidth…”
Get full text

A Frequency- and Polarization-Reconfigurable Stub-Loaded Microstrip Patch Antenna by Nghia Nguyen-Trong, Hall, Leonard, Fumeaux, Christophe

“…A stub-loaded microstrip patch antenna with reconfigurability in both frequency and polarization is presented. Using 12 varactors with two independent…”
Get full text

A Frequency- and Pattern-Reconfigurable Center-Shorted Microstrip Antenna by Nghia Nguyen-Trong, Hall, Leonard, Fumeaux, Christophe

“…A frequency- and pattern-reconfigurable antenna based on a center-shorted microstrip patch is presented. The novel design utilizes two resonance modes of a…”
Get full text

Transmission-Line Model of Nonuniform Leaky-Wave Antennas by Nghia Nguyen-Trong, Hall, Leonard, Fumeaux, Christophe

“…Nonuniform leaky-wave antennas (LWAs) are analyzed and synthesized using a lossy transmission line model. The analysis is based on a general waveguide circuit…”
Get full text

Optimised Hot-Via Transition with 20 dB Return Loss for MMIC Packaging from DC to 110 GHz by Milner, Leigh E., Mehta, Shyam G., Hall, Leonard T., Mahon, Simon J., Chakraborty, Sudipta, Heimlich, Michael C.

“…A hot-via transition from a monolithic microwave integrated circuit (MMIC) to a printed circuit board (PCB) has been developed with a measured back-to-back…”
Get full text

Analysis and Design of a Reconfigurable Antenna Based on Half-Mode Substrate-Integrated Cavity by Nguyen-Trong, Nghia, Kaufmann, Thomas, Hall, Leonard, Fumeaux, Christophe

“…The detailed analysis, design, and optimization of a reconfigurable antenna based on a periodically stub-loaded half-mode substrate-integrated waveguide…”
Get full text

p53 gene mutations in pituitary adenomas: rare events by Levy, A, Hall, L, Yeudall, W A, Lightman, S L

“…Occult pituitary adenomas are said to occur in up to 20% of random autopsy examinations, yet the only oncogene known to be associated with pituitary adenomas,…”
Get more information

A Frequency- and Polarization-Reconfigurable Circular Cavity Antenna by Nghia Nguyen-Trong, Piotrowski, Andrew, Hall, Leonard, Fumeaux, Christophe

“…The principle and experimental validation of a frequency- and polarization-reconfigurable antenna using switching PIN diodes is presented in this letter. The…”
Get full text

A Broadband 25 to 42 GHz SiGe Upconverter by Milner, Leigh E., Hall, Leonard T., Chakraborty, Sudipta, Ritchie, Charles G., Heimlich, Michael C.

“…A 0.13 SiGe upconverter circuit is presented that is suitable for use in broadband millimetre-wave transmitters and active phased arrays. The circuit accepts…”
Get full text

A dual‐band dual‐pattern frequency‐reconfigurable antenna by Nguyen‐Trong, Nghia, Hall, Leonard, Fumeaux, Christophe

“…The functionality of a dual‐band frequency‐reconfigurable antenna based on a microstrip patch is extended toward independent tuning of its two operational…”
Get full text

Wideband Millimeter-Wave Antennas With Magnetic-Dipole Patterns Integrated in Metallic Structures by Nghia Nguyen-Trong, Hall, Leonard, Kaufmann, Thomas, Fumeaux, Christophe

“…Two realizations of millimeter-wave (mm-wave) antennas with wideband and broad beam characteristics are introduced for flush integration in metallic…”
Get full text

Performance analysis of a series transformer for complex impedance matching by Hall, Leonard T., Hansen, Hedley J., Davis, Bruce R., Abbott, Derek

“…The ability to match any two complex impedances with a transforming series transmission line of appropriate length is known, but has not been widely studied or…”
Get full text

A 30-60 GHz SiGe transformer balun with offset radii coils for low amplitude and phase imbalance by Chakraborty, Sudipta, Milner, Leigh E., Hall, Leonard T., Parker, Anthony, Heimlich, Michael

“…Characterization of a wide-band transformer balun with low magnitude and phase imbalance is presented in this paper. Excellent balance over a large bandwidth…”
Get full text

Direct Down-Conversion 38 GHz GaAs and SiGe Receivers by Clement, Ryan M., Milner, Leigh E., Convert, Emmanuelle R., Hall, Leonard, Parker, Michael, McCulloch, MacCrae G., Dadello, Anna, Wu, Benny, Harvey, James T., Parker, Anthony E., Mahon, Simon J.

“…Direct down-conversion receivers at Ka band in GaAs and SiGe are measured and analysed with particular attention to linearity. The GaAs receiver is observed to…”
Get full text

Variational Analysis of Folded Substrate-Integrated Waveguides by Nguyen-Trong, Nghia, Kaufmann, Thomas, Hall, Leonard, Fumeaux, Christophe

“…An accurate numerical solution describing the propagation behavior of two types of folded substrate-integrated waveguide (FSIW) is demonstrated in this letter…”
Get full text

The Origin of Ultrasonic Absorption in Water by Hall, Leonard

Get full text

The Origin of Excess Ultrasonic Absorption in Water by Hall, Leonard

Get full text

On the tuning range of a reconfigurable half-mode substrate-integrated cavity antenna by Nghia Nguyen-Trong, Hall, Leonard, Fumeaux, Christophe

“…In this paper the theoretical maximum tuning range of a frequency-reconfigurable antenna based on a half-mode substrate-integrated cavity is investigated and…”
Get full text

Optimization of leaky-wave antennas based on non-uniform HMSIW by Nguyen-Trong, Nghia, Kaufmann, Thomas, Hall, Leonard, Fumeaux, Christophe

“…In this paper, the optimization of leaky-wave antennas (LWAs) based on non-uniform half-mode substrate-integrated waveguides (HMSIWs) is presented. The…”
Get full text

A biasing technique for varactor-loaded reconfigurable antennas by Nghia Nguyen-Trong, Hall, Leonard, Fumeaux, Christophe

“…In this paper, variations of a simple biasing technique for varactor-loaded frequency-reconfigurable antennas are discussed. The antenna chosen for the study…”
Get full text