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We report on the influence of substrate thickness on the performance of antenna coupled microbolometers for terahertz (THz) detection. Planar antennas with NbsNó microbolometers were fabricated on silicon substrates. Detected voltages of these antenna-coupled microbolometers are altered with a periodic variation from 0.5 THz to 0.75 THz, which is accorded with the reflection of the substrate. By placing...
This paper presents a terahertz (THz) spectrometer based on high temperature superconducting Josephson junction. The YBa2Cu3O7 (YBCO) bi-crystal Josephson junctions (JJS) with log-periodic antennas are used as detectors. In the low temperature, with the signal measurement, data acquisition and human-computer interactive system, the automatic measurement system of THz spectrometer is finally accomplished...
In this paper, we present several antenna-array topologies for quadrature spatial combining: In-phase and Quadrature signals are not anymore combined at the circuit level but rather spatially in free space. To demonstrate the feasibility of this concept, an organic module with two 4×1 antenna-arrays is fabricated and measured in V-band. Reflection coefficient and realized gain measurements are very...
This paper describes two independent methods for estimating the insertion loss of patch array antennas that were developed for the Juno Microwave Radiometer instrument. One method is based principally on pattern measurements while the other method is based solely on network analyzer measurements. The methods are accurate to within 0.1 dB for the measured antennas and show good agreement (to within...
This paper presents a practical overview of the design and analysis of these antennas and compares measurements with the predictions, including those of finite element models on a finite ground plane using HFSS a relatively large problem electrically. It was found that there was very good agreement between the HFSS predictions and the measured patterns down to at least -35dB. Due to limited time and...
The design of metal patch antennas was presented along with performance data for Juno MWR flight model antenna arrays. Metal patches are supported by a large diameter metallic column and contain no dielectric. This makes metal patches attractive for applications where dielectrics are problematic, such as environments prone to electrostatic discharge, high radiation, and very high frequency operation...
A novel improved loaded open sleeve antenna is proposed for broadband application in UHF/VHF. This proposed open sleeve antenna has symmetry distribution of the parasitic elements which can commendably solve the problem of horizontal pattern asymmetry of conventional open sleeve antenna. Top loading technology is adopted simultaneously which minimize the size of the antenna by 32%. Meanwhile, tandem...
The requirements, design, and performance of the Juno Microwave Radiometer patch array antennas were discussed. The antennas meet both the electrical performance and environmental requirements. There is generally good agreement between measurements and calculations.
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