scispace - formally typeset
Search or ask a question
Topic

Phased array

About: Phased array is a research topic. Over the lifetime, 19428 publications have been published within this topic receiving 229231 citations. The topic is also known as: Phased Array Radar, PAR.


Papers
More filters
Journal ArticleDOI
TL;DR: In this paper, an electronically scanable antenna with a large aperture was obtained, using a small array, where the main reflector need not be fabricated accurately, since small imperfections can be corrected efficiently by the array, and a 4.2m diameter antenna was discussed for a 12-14 GHz satellite with a field of view of 3 degrees by 6 degrees required for coverage of the continental United States.
Abstract: To obtain the performance of a large aperture phased array, a small phased array is combined with a large main reflector and an imaging arrangement of smaller reflectors to form a large image of the small array over the main reflector. An electronically scanable antenna with a large aperture is thus obtained, using a small array. An attractive feature of the imaging arrangement is that the main reflector need not be fabricated accurately, since small imperfections can be corrected efficiently by the array. As an application, a 4.2-m diameter antenna is discussed for a 12–14 GHz satellite with a field of view of 3 degrees by 6 degrees required for coverage of the continental United States.

86 citations

Journal ArticleDOI
TL;DR: The theoretical and experimental results of a new approach for multitarget vital-signs monitoring using an electromagnetic-based Doppler radar that prevents the phase collision of the signatures of the targets and hence provides multiperson detection capability to the system are presented.
Abstract: This paper presents the theoretical and experimental results of a new approach for multitarget vital-signs monitoring using an electromagnetic-based Doppler radar. A phased-array radar is designed and implemented using a hybrid beamforming architecture to generate two simultaneous beams. The proposed system significantly mitigates the phase collision problem in the presence of multiple targets. Comprehensive discussions on the theory of multibeam systems alongside detailed simulations are provided. For the purpose of demonstration, a prototype dual-beam phased-array continuous-wave Doppler radar has been designed and implemented at 2.4 GHz. The system is fully characterized, and the measurement results confirm the feasibility of the proposed method. The experimental measurements show that for the first time, the breathing rates of two individuals can be monitored at the same time and using the same frequency. Several practical aspects of the system are examined, and a pilot study on the subject tracking is presented. The proposed dual-beam system prevents the phase collision of the signatures of the targets and hence provides multiperson detection capability to the system.

86 citations

Journal ArticleDOI
TL;DR: In this article, a planar plasma reflector is used as a reflector for radar waves, which allows electronic beam steering at frequencies above what is generally viable for phased arrays.
Abstract: The author describes investigations into methods of generating a planar plasma for use as a reflector for radar waves. The use of the plasma reflector could allow electronic beam steering at frequencies above what is generally viable for phased arrays. Three aspects of the planar plasma production are investigated: localization of the plasma, main plasma production, and long-term viability of the system. Possible applications include ship-based antennas at X-band, airborne antennas at 94 GHz, and space-based antennas at 60 GHz. The author discusses system considerations for the three potential radar configurations. Results and potential small-scale experiments to test various aspects of the concept are discussed. >

86 citations

Journal ArticleDOI
TL;DR: In this paper, a waveguide hybrid phased array (HPA) for mobile satellite communications operating in the Ku-band is proposed, which adopts an electrical scan in elevation and mechanical scan in azimuth to track satellites.
Abstract: This paper introduces a novel waveguide hybrid phased array (HPA) for mobile satellite communications operating in Ku-band. The array is low profile and low cost, adopting an electrical scan in elevation and mechanical scan in azimuth to track satellites. High directivity and wide bandwidth impedance is provided by a dual linear polarized waveguide radiating element that covers both Rx and Tx frequencies within the band. The vertical and horizontal polarizations are excited by direct feeding and slot coupled aperture feeding, respectively. The array structure of $32 \times 12$ elements is split into inclined and interlaced 12 subarrays 225 mm in height. The feed networks and duplexers are designed in unconventional waveguide sizes. In the system, there are 12 independent receiving (Rx) and transmitting (Tx) modules with phased shifter components, which realize beam and polarization tracking. The system is designed to track satellites by scanning $15^\circ{-}75^\circ$ (relative to the ground plane) electrically in the elevation and $0^\circ{-}360^\circ$ mechanically in the azimuth. The array has been successfully developed and measured. The maximal gain loss in scanning range is about 4.0 dB.

86 citations

Journal ArticleDOI
TL;DR: In this paper, the first millimeter-wave wafer-scale power-amplifier array implemented in a 0.13-μm m BiCMOS technology was demonstrated with an equivalent isotropic radiated power of 33-35 dBm.
Abstract: This paper presents the first millimeter-wave wafer-scale power-amplifier array implemented in a 0.13-μ m BiCMOS technology. The power combining is done in the free-space using high efficiency on-chip antennas. A 3 × 3 power-amplifier array is demonstrated with an equivalent isotropic radiated power of 33-35 dBm at 90-98 GHz. This results in a total on-chip power of 21-23 dBm and a total radiated power of 17.5-19.5 dBm. The measured patterns of the array show single-mode operation and ~100% free-space power-combining efficiency with a 3-dB beamwidth of 28° and a directivity of 15.5 dB (gain of 12 dB). The total power-combining efficiency including the antenna losses is 45±10%. The application areas are in millimeter-wave transmitters and wafer-scale phased arrays.

86 citations


Network Information
Related Topics (5)
Antenna (radio)
208K papers, 1.8M citations
87% related
Radar
91.6K papers, 1M citations
86% related
Transmitter
61.9K papers, 874.2K citations
82% related
Amplifier
163.9K papers, 1.3M citations
81% related
Resonator
76.5K papers, 1M citations
81% related
Performance
Metrics
No. of papers in the topic in previous years
YearPapers
2023373
20221,052
2021661
2020979
20191,266
20181,066