A compact ultra‐wideband receiving antenna for monitoring applications

2021 ◽  
Author(s):  
Ying Zhang ◽  
Xin Chen ◽  
Jiaqi Yao ◽  
Jizhong Yang ◽  
Zhiming Mao ◽  
...  
Keyword(s):  
Ultra Wideband ◽  
Receiving Antenna ◽  
Monitoring Applications

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.

PROTOTYPE ULTRA WIDEBAND RADAR SYSTEM FOR BLADDER MONITORING APPLICATIONS

2012 ◽  
Vol 33 ◽  
pp. 17-28 ◽  
Author(s):  
Martin O'Halloran ◽  
Fearghal Morgan ◽  
Daniel Flores-Tapia ◽  
Dallan Byrne ◽  
Martin Glavin ◽  
...  
Keyword(s):  
Radar System ◽  
Ultra Wideband ◽  
Monitoring Applications ◽  
Wideband Radar

scholarly journals Undistorted reception of impulse carrier-free signals using a ferrite antenna

2019 ◽  
Keyword(s):  
Electromagnetic Field ◽  
High Sensitivity ◽  
Ultra Wideband ◽  
Pulse Field ◽  
Pulsed Electromagnetic Field ◽  
Time Frequency ◽  
Receiving Antenna ◽  
Carrier Free ◽  
Common Carrier ◽  
Pulsed Electromagnetic

Relevance. In recent decades, a new direction of radar has emerged. Temporarily and spatially limited signals with different types of envelope and the wide width of the spectrum have found their application here. The use of such ultra-wideband (UWB) electromagnetic pulses in subsurface sounding requires changes in the principles of designing of equipment for radar systems, including receiving antenna systems. The urgent task remains to build compact pulsed UWB receiving antennas that have high sensitivity and do not distort the shape of the received signal. As such antennas, ferrite loop antennas can be used. The use of ferrite rods in receiving antennas allows to increase their sensitivity, leaving the dimensions small. Methods of designing UWB pulsed ferrite antennas are still in the initial stage of their development and require comprehensive fundamental and applied research. The purpose of work is to investigate the shape of the induced current in the receiving antenna consisting of a ferrite rod with a loop of a conductor when the antenna is excited by a pulsed electromagnetic field of the form of the most common carrier-free signals. Methods. To calculate the currents induced in a conductor that encloses a ferrite rod, the finite difference time domain method (FDTD) was used. Results. There were revealed the relationships between optimal from the point of view of effective undistorted signal reception, the electrodynamic parameters of the ferrite element of the antenna, and the time-frequency parameters of the exciting pulse field in the form of the most common carrier-free functions, namely, the Gaussian functions, the 1st and 2nd derivatives in time of the Gauss function. Conclusions. The parameters of the ferrite element of the pulsed receiving antenna and the carrier-free exciting pulsed electromagnetic field, at which the receiving antenna in the form of a ferrite rod with a loop of conductor provides sensitive undistorted reception of the pulse signals were determined.

scholarly journals Performance Analysis of Ultra-Wideband Channel for Short-Range Monopulse Radar at Ka-Band

2012 ◽  
Vol 2012 ◽  
pp. 1-9 ◽  
Author(s):  
Naohiko Iwakiri ◽  
Natsuki Hashimoto ◽  
Takehiko Kobayashi
Keyword(s):  
Short Range ◽  
Ultra Wideband ◽  
Matched Filtering ◽  
Angle Of Arrival ◽  
Ka Band ◽  
Range Resolution ◽  
Wideband Signals ◽  
Measurement Results ◽  
Receiving Antenna ◽  
High Range

High-range resolution is inherently provided with Ka-band ultra-wideband (UWB) vehicular radars. The authors have developed a prototype UWB monopulse radar equipped with a two-element receiving antenna array and reported its measurement results. In this paper, a more detailed verification using these measurements is presented. The measurements were analyzed employing matched filtering and eigendecomposition, and then multipath components were extracted to examine the behavior of received UWB monopulse signals. Next, conventional direction finding algorithms based on narrowband assumption were evaluated using the extracted multipath components, resulting in acceptable angle-of-arrival (AOA) from the UWB monopulse signal regardless of wideband signals. Performance degradation due to a number of averaging the received monopulses was also examined to design suitable radar's waveforms.

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