Scientific and Technical Aerospace Reports Volume 38 July 28, 2000

ing geometry. In this talk, the simulation results are compared with the C-band TM IFSAR derived topography, and the TE/TM
SAR images at L-Band.
Author
Synthetic Aperture Radar; Interferometry; C Band; Ultrahigh Frequencies; Radar Imagery; Imaging Techniques
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ELECTRONICS AND ELECTRICAL ENGINEERING
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20000062305 University of Central Florida, Electrical Engineering Dept., Orlando, FL USA
A Low Loss Microstrip Antenna for Radiometric Applications Final Report
Wahid, Parveen, University of Central Florida, USA; May 2000; 39p; In English
Contract(s)/Grant(s): NAG1-1917; No Copyright; Avail: CASI; A03, Hardcopy; A01, Microfiche
The design and analysis of a series-fed, low-loss, inverted microstrip array antenna, operating at 1.413 GHz is presented. The
antenna is composed of two subarrays. Each subarray consists of an equal number of microstrip patches all connected together
with microstrip lines. In the first design microstrip array for linear polarization is presented which incorporated a series feeding
technique. The next design, which is capable of dual linear polarization (V-polarization and H-polarization), utilizes a corporate
feed network for the V-pol and series feed arrangement for the H-pol. The first element of each subarray for H-pol is coaxially
fed with a 180 deg phase difference. This approach ensures a symmetric radiation pattern on broadside in H-pol. For the V-pol
two feeds are in the same phase on the two subarrays ensuring a broadside beam in V-pol. The designs presented here are simulated
using the IE3D code that utilizes the method of moments. Measured results are compared with simulated results and show good
agreement.
Author
Antenna Radiation Patterns; Design Analysis; Antenna Arrays; Microstrip Transmission Lines
20000062306 Jet Propulsion Lab., California Inst. of Tech., Pasadena, CA USA
A Fresh Look at Spatial Power Combining Oscillators
Pearson, L. Wilson, Jet Propulsion Lab., California Inst. of Tech., USA; Pogorzelski, Ronald J., Jet Propulsion Lab., California
Inst. of Tech., USA; [1999]; 38p; In English; No Copyright; Avail: CASI; A03, Hardcopy; A01, Microfiche
Spatial Power Combining is an enabling technology for achieving useful power levels from solid state devices at millimeter
wavelengths. Oscillator-based combining came first, historically, but has been passed over for what practitioners believe to be
more reliable amplifier based technology. Recent results in oscillator-based. combining systems offer possibilities for technology
breakthrough.
Derived from text
Millimeter Waves; Oscillators; Solid State Devices
20000062454 National Inst. of Standards and Technology, Electronics and Electrical Engineering Lab., Boulder, CO USA
Design and Testing of NFRad: A New Noise Measurement System
Grosvenor, C. A.; Randa, J.; Billinger, R. L.; Mar. 2000; 46p; In English
Report No.(s): PB2000-105222; NIST/TN-1518; No Copyright; Avail: CASI; A03, Hardcopy; A01, Microfiche
The NIST Noise project has constructed and tested a new, automated, coaxial (GPC-7) radiometer for the measurement of
noise sources in the 8-12 GHz frequency band. It is an isolated, total-power radiometer that relies on lookup tables for relevant
reflection coefficients and path asymmetry. This permits measurement at multiple frequencies much more quickly than on previous
NIST systems. This paper reviews the theory, describes the design of the system and its components, and details the testing
procedures and the operation of the system.
NTIS
Noise Measurement; Radiometers; Thermal Noise; Design Analysis; Performance Tests