Search Results - "Hacker, J. B."

MEM relay for reconfigurable RF circuits by Mihailovich, R.E., Kim, M., Hacker, J.B., Sovero, E.A., Studer, J., Higgins, J.A., DeNatale, J.F.

“…We describe a microelectromechanical (MEM) relay technology for high-performance reconfigurable RF circuits. This microrelay, fabricated using surface…”
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A DC-to-40 GHz four-bit RF MEMS true-time delay network by Kim, M., Hacker, J.B., Mihailovich, R.E., DeNatale, J.F.

“…A monolithic true-time delay (TTD) network containing sixteen metal-to-metal contact RF microelectromechanical systems (MEMS) switches has been successfully…”
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A monolithic MEMS switched dual-path power amplifier by Kim, M., Hacker, J.B., Mihailovich, R.E., DeNatale, J.F.

“…RF MEMS switches have been successfully integrated with HEMT MMIC circuits on a GaAs substrate to construct a dual-path power amplifier at X-band. The…”
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Wave-front adaptive control structure (WACS) for quasi-optical power amplifiers in Intelligent RF front-ends by Hao Xin, Hacker, J.B., Sailer, A., Nagy, G., Higgins, J.A., Pilz, D., Rosker, M.J.

“…Tunable electromagnetic crystal (EMXT) surfaces are used as rectangular waveguide sidewalls to provide uniform excitation for quasi-optical power amplifiers…”
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A 325 GHz InP HBT Differential-Mode Amplifier by Hacker, J B, Lee, Y M, Park, H J, Rieh, J.-S, Kim, M

“…An MMIC amplifier operating at the highest reported frequency up to date for indium-phosphide double-heterojunction bipolar (DHBT) transistor technology is…”
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An ultra-low loss millimeter-wave solid state switch technology based on the metal - insulator - transition of vanadium dioxide by Hillman, C., Stupar, P. A., Hacker, J. B., Griffith, Z., Field, M., Rodwell, M.

“…A new ultra-low-loss and broad band millimeter wave switch technology based on the reversible metal / insulator phase transition of vanadium dioxide has been…”
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A very-low-loss 2-bit X-band RF MEMS phase shifter by Tan, G.L., Mihailovich, R.E., Hacker, J.B., DeNatale, J.F., Rebeiz, G.M.

“…A novel low-loss phase shifter, based on RF MEMS series switches and a single-pole four-throw (SP4T) switch design, is presented. The phase shifter is…”
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Implications of upgrading a minor forest road on traffic and road-kill in southeast Queensland by Jones, D.N, Griffiths, M.R, Griffiths, J.R, Hacker, J.L.F, Hacker, J.B

“…The planned upgrade of a minor road in Brisbane connecting two suburbs through a forested area raised concerns about possible increases in road-kill in an area…”
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Seed dormancy and factors controlling dormancy breakdown in buffel grass accessions from contrasting provenances by HACKER, J. B, RATCLIFF, D

“…Seed dormancy and factors affecting dormancy breakdown were studied in fifteen accessions of buffel grass (Cenchrus ciliaris ), eight of near-equatorial and…”
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The Potential for Buffel Grass Renewal from Seed in 16-Year-Old Buffel Grass-Siratro Pastures in South-East Queensland by Hacker, J. B.

“…(1) Seed production by buffel grass (Cenchrus ciliaris) cv. Biloela and soil seed reserves were studied in two 16-year-old buffel grass-siratro (Macroptilium…”
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A waveguide shutter using electromagnetic crystals by Kim, M., Sung, Y., Higgins, J. A., Xin, H., Hacker, J. B.

“…A new waveguide component that controls RF power flow with variable‐surface impedance electromagnetic (EM) crystals is proposed. To prove the concept, two…”
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Genetic variation in seed production and its components in four cultivars of the pasture grass Setaria sphacelata by Hacker, J.B. (Division of Tropical Crops and Pastures CSIRO, St. Lucia, Qld. (Australia).), Cuany, R.L

“…Variation in seed production and its components was investigated between and within four cultivars of the pasture grass Setaria sphacelata, in two experiments…”
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Low-loss 2- and 4-bit TTD MEMS phase shifters based on SP4T switches by Guan-Leng Tan, Mihailovich, R.E., Hacker, J.B., DeNatale, J.F., Rebeiz, G.M.

“…2- and 4-bit microelectromechanical system (MEMS) X- to K/sub u/-band true-time-delay phase shifters with a very low insertion loss are described. The phase…”
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A rectangular tem waveguide with photonic crystal walls for excitation of quasi-optical amplifiers by Kim, M., Hacker, J.B., Sailer, A.L., Kim, S., Sievenpiper, D., Higgins, J.A.

“…Thin photonic crystal substrates are used to produce a TEM mode in a rectangular waveguide. Hexagonal pads arranged in honeycomb lattice and connected to the…”
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Drift Seeds and Fruit on Raine Island, Northern Great Barrier Reef, Australia by Hacker, J. B.

“…The vegetation of Raine Island, a sand cay of the northern Great Barrier Reef and the drift seeds and fruit on its beach and along its strand-line were studied…”
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300 GHz six-stage differential-mode amplifier by Park, H J, Rieh, J S, Kim, M, Hacker, J B

“…A 300 GHz amplifier is fabricated using indium-phosphide (InP) double-heterojunction bipolar transistor (DHBT) technology. The cascade chain in the amplifier…”
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Genetic Variation in Seed Dormancy in Digitaria milanjiana in Relation to Rainfall at the Collection Site by Hacker, J. B.

“…(1) Digitaria milanjiana (Rendle) Stapf, is a highly variable grass species which occurs in regions of low (450 mm) to high (1700 mm) rainfall in central and…”
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A Ka-band 3-bit RF MEMS true-time-delay network by Hacker, J.B., Mihailovich, R.E., Moonil Kim, DeNatale, J.F.

“…A monolithic Ka-band true-time-delay (TTD) switched-line network containing 12 metal-to-metal contact RF microelectromechanical system switches has been…”
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An ultra-low power InAs/AlSb HEMT Ka-band low-noise amplifier by Hacker, J.B., Bergman, J., Nagy, G., Sullivan, G., Kadow, C., Heng-Kuang Lin, Gossard, A.C., Rodwell, M., Brar, B.

“…The first antimonide-based compound semiconductor (ABCS) MMIC, a Ka-Band low-noise amplifier using 0.25-μm gate length InAs/AlSb metamorphic HEMTs, has been…”
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Incident angle-dependent effective surface impedance (Z/sub S/) of Electromagnetic Crystal (EMXT) by Hao Xin, Kim, M., Hacker, J.B., Higgins, J.A.

“…Electromagnetic crystal (EMXT) surfaces are modeled with effective surface impedance method. Effects of oblique incidence are studied using a technique similar…”
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