Search Results - "Hacker, JB"

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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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 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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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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Low-power W-band CPWG InAs/AlSb HEMT low-noise amplifier by Riemer, P.J., Buhrow, B.R., Hacker, J.B., Bergman, J., Brar, B., Gilbert, B.K., Daniel, E.S.

“…We present the development of a low-power W-band low-noise amplifier (LNA) designed in a 200-nm InAs/AlSb high electron mobility transistor (HEMT) technology…”
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A 2-bit miniature X-band MEMS phase shifter by Guan-Leng Tan, Mihailovich, R.E., Hacker, J.B., DeNatale, J.F., Rebeiz, G.M.

“…The design and performance of a compact low-loss X-band true-time-delay (TTD) MEMS phase shifter fabricated on 8-mil GaAs substrate is described. A semi-lumped…”
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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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An ultra-low power InAs/AlSb HEMT W-band low-noise amplifier by Hacker, J.B., Bergman, J., Nagy, G., Sullivan, G., Kadow, C., Lin, H.-K., Gossard, A.C., Rodwell, M., Brar, B.

“…An antimonide-based compound semiconductor (ABCS) microstrip MMIC, a W-Band low-noise amplifier using 0.2-μm gate length InAs/AlSb metamorphic HEMTs, has been…”
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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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Susceptibility of Pearl Millet Accessions and Cultivars to Johnsongrass Mosaic and Sugarcane Mosaic Viruses in Queensland by Karan, M, Noone, DF, Teakle, DS, Hacker, JB

“…In 1990, 23 accessions of Pennisetum americanum [P. glaucum] were examined for virus infection at Gatton, south-eastern Queensland, Australia. All accessions…”
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The application of photonic crystals to quasi-optic amplifiers by Higgins, J.A., Kim, M., Hacker, J.B., Sievenpiper, D.

“…Quasi-optical spatial power combining provides the high combining efficiency required of solid-state power amplifiers for millimeter-wave frequencies. Photonic…”
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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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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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A 100-element HBT grid amplifier by Moonil Kim, Sovero, E.A., Hacker, J.B., De Lisio, M.P., Jung-Chih Chiao, Shi-Jie Li, Gagnon, D.R., Rosenberg, J.J., Rutledge, D.B.

“…A 100-element 10-GHz grid amplifier has been developed. The active devices in the grid are chips with heterojunction-bipolar-transistor (HBT) differential…”
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A waveguide mode-converter feed for a 5-W, 34-GHz grid amplifier by Chun-Tung Cheung, Hacker, J.B., Nagy, G., Rutledge, D.B.

“…We have demonstrated a compact waveguide mode converter that excites a combination of TE/sub 10/ and TE/sub 30/ modes for feeding a grid amplifier. The length…”
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A 4-bit miniature X-band MEMS phase shifter using switched-LC networks by Tan, G.L., Mihailovich, R.E., Hacker, J.B., DeNatale, J.F., Rebeiz, G.M.

“…A compact 4-bit true-time-delay MEMS phase shifter fabricated on 8-mil GaAs substrate is described. Miniaturization of the phase shifter is achieved using…”
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A high-power W-band quasi-optical frequency tripler by Hacker, J.B., Sailer, A.L., Brar, B., Nagy, G., Pierson, R.L.Jr, Higgins, J.A.

“…A monolithic W-band quasi-optical array consisting of 196 heterostructure barrier varactors mounted in a waveguide has produced 684 mW of CW output power with…”
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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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Variation in temperature requirements for germination and early seedling root development in Chamaecrista rotundifolia and three allied species by Xu Minggang, McDonald, C K, Liu, C J, Hacker, J B

“…Two experiments are discussed. In the first, rates of root elongation during the first four days of growth at 25 °C were studied in Chamaecrista rotundifolia…”
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