scholarly journals Analysis of quasi-optical power combiners by vector field measurements at 150 GHz

2007 ◽  
Vol 5 ◽  
pp. 419-425 ◽  
Author(s):  
R. Judaschke ◽  
J. Weinzierl
Keyword(s):  
Vector Field ◽  
Electric Field ◽  
Antenna Array ◽  
Optical Power ◽  
Field Measurements ◽  
Horn Antenna ◽  
Power Combining ◽  
Power Combiners ◽  
Submillimeter Wavelengths ◽  
Receiving Antenna

Abstract. A Two-dimensional quasi-optical power dividing/combining circuit has been experimentally investigated at 150 GHz. It consists of a rectangular horn antenna array as receiving/transmitting unit and a dual offset reflector setup to match the radiated field(s) to the pattern of the receiving antenna(s). To verify both design and adjustment of the quasi-optical circuit, electric field scans have been performed in selected planes and volumes of the setup. To measure the spatial electric field distribution, a vector field measurement system has been developed which operates in the frequency range between 148 GHz and 152 GHz. Excellent agreement between calculated and measured results for a horn antenna array approve the predicted results calculated under the physical optics approximation. Measured power dividing/combining efficiency of the passive structure of 63% for an inter-element spacing of 10$ \\lambda$ indicates that the power combining principle is a suitable method up to submillimeter wavelengths.

scholarly journals A Large Aperture UWB Antenna Array for Real Beam Radar Imaging

2012 ◽  
Vol 2012 ◽  
pp. 1-7 ◽  
Author(s):  
Chao-Hsiang Liao ◽  
Dau-Chyrh Chang
Keyword(s):  
Antenna Array ◽  
Horn Antenna ◽  
Radar Imaging ◽  
Ultra Wideband ◽  
Slot Antenna ◽  
Uwb Antenna ◽  
Large Aperture ◽  
Receiving Antenna ◽  
Transmitting Antenna ◽  
Double Ridge

The development of four-element ultra-wideband (UWB) comb taper slot antenna array with 18 cm element spacing for real beam radar imaging is described. The four-element UWB array system with optimum element spacing is analyzed by energy pattern. A wideband double ridge horn antenna is used as the transmitting antenna, the developed large aperture UWB array is used as the receiving antenna. The transmitting antenna and the receiving antenna are combined with impulse time domain measurement system to achieve real beam radar imaging. The receiving impulse signals at various positions are processed by the time delay and sum algorithm. The examples of several aluminum cans have been verified in the resolution and compared with using the UWB array as a receive antenna and the double ridge horn as a transmit antenna in the test setup. The crossrange resolution of UWB antenna array is better than wideband double ridge horn antenna because the beam width of UWB array is narrower.

scholarly journals Profiled Horn Antenna with Wideband Capability Targeting Sub-THz Applications

Electronics ◽  
2021 ◽  
Vol 10 (4) ◽  
pp. 412
Author(s):  
Jay Gupta ◽  
Dhaval Pujara ◽  
Jorge Teniente
Keyword(s):  
Hermite Polynomial ◽  
Polynomial Interpolation ◽  
Horn Antenna ◽  
Submillimeter Wavelengths ◽  
Thz Applications ◽  
Millimeter And Submillimeter Wavelengths ◽  
Better Than

This paper proposes a wideband profiled horn antenna designed using the piecewise biarc Hermite polynomial interpolation and validated experimentally at 55 GHz. The proposed design proves S11 and directivity better than −22 dB and 25.5 dB across the entire band and only needs 3 node points if compared with the well-known spline profiled horn antenna. Our design makes use of an increasing radius and hence does not present non-accessible regions from the aperture, allowing its fabrication with electro erosion techniques especially suitable for millimeter and submillimeter wavelengths.

Atomic 2D electric field imaging of a Yagi–Uda antenna near-field using a portable Rydberg-atom probe and measurement instrument

2020 ◽  
Vol 9 (5) ◽  
pp. 305-312
Author(s):  
Ryan Cardman ◽  
Luís F. Gonçalves ◽  
Rachel E. Sapiro ◽  
Georg Raithel ◽  
David A. Anderson
Keyword(s):  
Electric Field ◽  
Electric Fields ◽  
Field Measurement ◽  
Near Field ◽  
Measurement Instrument ◽  
Rydberg Atom ◽  
Field Measurements ◽  
Atom Probe ◽  
Electric Field Measurement ◽  
Measurement Uncertainties

AbstractWe present electric field measurements and imaging of a Yagi–Uda antenna near-field using a Rydberg atom–based radio frequency electric field measurement instrument. The instrument uses electromagnetically induced transparency with Rydberg states of cesium atoms in a room-temperature vapor and off-resonant RF-field–induced Rydberg-level shifts for optical SI-traceable measurements of RF electric fields over a wide amplitude and frequency range. The electric field along the antenna boresight is measured using the atomic probe at a spatial resolution of ${\lambda }_{RF}/2$ with electric field measurement uncertainties below 5.5%, an improvement to RF measurement uncertainties provided by existing antenna standards.

scholarly journals Modulation of urban atmospheric electric field measurements with the wind direction in Lisbon (Portugal)

2015 ◽  
Vol 646 ◽  
pp. 012013 ◽  
Author(s):  
H G Silva ◽  
J C Matthews ◽  
R Conceição ◽  
M D Wright ◽  
S N Pereira ◽  
...  
Keyword(s):  
Electric Field ◽  
Wind Direction ◽  
Field Measurements ◽  
Atmospheric Electric Field ◽  
Electric Field Measurements
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