Scientific and Technical Aerospace Reports Volume 38 July 28, 2000

A monolithic W-band three-stage Low Noise Amplifiers (LNA) based on 0.1 um pseudomorphic InAlAs/InGaAs/InP (High
Electron Mobility Transistors (HEMTs) has been developed. this LNA demonstrated a noise figure of 4.3 dB and an associated
small signal gain of 19 dB at 100 GHz with a low dc power consumption of 20 mW. This is the best reported monolithic W-band
LNA performance using InP-based HEMT technology and demonstrates the potential of InP HEMT technology for higher millimeter-wave
applications.
Author
High Electron Mobility Transistors; Indium Aluminum Arsenides; Indium Gallium Arsenides; Indium Phosphides; Low Noise;
Amplifiers; Integrated Circuits
20000063389 Sterling Software, Inc., Information Technology Div., Rome, NY USA
GCCS Spatial Data Base Module Extensions Final Report, Jun. 1996 - Jul. 1997
Bell, Paul; Kolassa, David; McQuinn, Michael; Stoltz, Sandra; Reid, William; Jul. 1998; 40p; In English
Contract(s)/Grant(s): F30602-94-D-0007; AF Proj. R533
Report No.(s): AD-A377240; AFRL-IF-RS-TR-1998-158; No Copyright; Avail: CASI; A03, Hardcopy; A01, Microfiche
The Global Command and Control Systems (GCCS) is the DoD’s primary joint command, control, communications, computer,
and intelligence systems. The Joint Mapping Toolkit (JMTK) provides the mapping function to the Core Operating Environment
(COE) of the GCCS. JMTK is divided into three primary areas: (1) Visual, (2) Analysis (nonvisual), and (3) Spatial Data
Base (SDBM). The primary objective of the SDBM effort is to define, design, develop and test mapping, charting and geodesy
(MC&G) spatial data base management and data access software for the inclusion as the SDBM of the GCCS COE JMTK. The
SDBM contains the following capabilities: Import NIMA data in standard formats (VPF, RPF, DTED, ITD); archive NIMA data
in the original format without reformatting any data (preprocessing); and provide data access and retrieval through the use of public
API functions.
DTIC
Command and Control; Communication; Computers; Artificial Intelligence
20000063492 NASA Lewis Research Center, Cleveland, OH USA
Development of Leaky Wave Antennas for Layered Ridge Dielectric Waveguide
Ponchak, George E., NASA Lewis Research Center, USA; Katehi, Linda P. B., Michigan Univ., USA; [1993]; 4p; In English; 1993
International Symposium, 28 Jun. - 2 Jul. 1993, Baltimore, MD, USA; Sponsored by Institute of Electrical and Electronics Engineers,
USA
Contract(s)/Grant(s): RTOP 632-6E-51; No Copyright; Avail: CASI; A01, Hardcopy; A01, Microfiche
The millimeter wave, especially above 100 GHz, and the submillimeter wave frequency spectrum offers the possibility for
narrow-beam, high-resolution antennas which are critical for high definition radars required for space debris tracking, airport
ground avoidance radars, and missile tracking. In addition, the frequency which most atmospheric constituents may be detected
lie in this part of the frequency spectrum. Therefore, the development of electronic components for millimeter/submillimeter wave
passive sensors is required for environmental monitoring of the Earth’s atmosphere. Typical microwave transmission lines such
as microstrip and coplanar waveguide rely on two or more electrical conductors to concentrate and guide the electromagnetic
energy. Unfortunately, the surface resistance of the conductors increases as the square root of frequency. In addition, the circuit
dimensions must be decreased with increasing frequency to maintain a single mode transmission line which further increases the
conductor loss. An alternative family of transmission lines are formed from two or more insulating materials and rely on the differences
in the permittivities between the two materials to guide the wave. No metal conductors are required although some dielectric
waveguides do utilize a metallic ground plane to facilitate the interconnections of active electrical elements or to reduce the transmission
line size. Examples of such transmission lines are image guides, insulated image guides, trapped image guides, ridge
guide, and layered ridge dielectric waveguide (LRDW). Although most dielectric waveguides have dimensions on the order of
lambda to provide sufficient field confinement, the LRDW has been shown to provide good field confinement for electrically
small lines. This offers an advantage in circuit integration. It has been shown that a periodic array of metallic strips placed either
along or on top of a dielectric waveguide forms an effective radiator. This antenna is easy to fabricate and there is good background
of microstrip type antenna design information in the literature. This paper reports the development of the first frequency scanning
antenna fed by a LRDW.
Derived from text
Dielectric Waveguides; Millimeter Waves; Submillimeter Waves; Transmission Lines; Microwaves; Waveguide Antennas; Microwave
Transmission
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