Holography-based phased-array antenna for robust radar sensing and communication systems

2014 ◽  
Author(s):  
E.C. Ngai
Keyword(s):  
Communication Systems ◽  
Phased Array ◽  
Array Antenna ◽  
Phased Array Antenna ◽  
Radar Sensing

scholarly journals Cooperative Antenna Selection Method for Directional Antenna Ad Hoc Networks Based on ALOHA

2021 ◽  
Vol 2021 ◽  
pp. 1-15
Author(s):  
Bowen Zheng ◽  
Songlin Sun ◽  
Guoyuan Shao
Keyword(s):  
Communication Systems ◽  
Phased Array ◽  
Time Synchronization ◽  
Antenna Selection ◽  
Transmission Probability ◽  
Directional Antennas ◽  
Selection Method ◽  
Array Antenna ◽  
Phased Array Antenna ◽  
External Time

In recent years, directional antennas or phased array antennas are being widely used in communication systems due to the higher antenna gains. However, without external time synchronization and angle synchronization, the unsynchronized node usually takes a long time to synchronize with the existing nodes due to the narrow beams. Although the multibeam transmission or the digital phased array antenna can reduce this problem, it is clear that the cost of the digital phased array antenna is currently too high. Without external time synchronization and angle synchronization, a cooperative antenna selection method based on directional antennas is proposed in this paper. Our method only uses the narrow beams to transmit and to receive and reduces the time for self-synchronization. In this paper, we give the expression of the expected average time for the self-synchronization of multiple nodes, transform the problem into the problem of finding the minimum value of the infinite norm of the sequence, and then propose a cooperative antenna selection method which calculates the optimal transmission probability distribution of the node in different directions through parameter sharing and relative geometric position relationship between nodes. Finally, we verify the proposed method through simulation, and the number of beams is set between 6 and 10. In a typical scenario of five nodes, our method reduces the maximum average self-synchronization time by 50% averagely, compared with the traditional method which sends the different antenna beams at equal probability.

scholarly journals Frequency Diverse Array Antennas: From Their Origin to Their Application in Wireless Communication Systems

2018 ◽  
Vol 2018 ◽  
pp. 1-12 ◽  
Author(s):  
Shaddrack Yaw Nusenu ◽  
Abdul Basit
Keyword(s):  
Wireless Communication ◽  
Communication Technology ◽  
Communication Systems ◽  
Phased Array ◽  
Beam Steering ◽  
Array Antenna ◽  
Wireless Communication Systems ◽  
Phased Array Antenna ◽  
Frequency Diverse Array ◽  
Near Future

Wireless communication systems have gained considerable growth rate nowadays, with the anticipation that communications will be available everywhere and anywhere in the near future. Phased array antenna whose beam steering is fixed in an angle for all range cells has been utilized for wireless communications. To mitigate this problem, a new array concept, namely, frequency diverse array (FDA), was proposed. This paper presents how FDA technology could be useful in today’s wireless communication technology. FDA is distinct from phased array in a sense that it employs frequency increment across array elements. The use of a frequency increment creates a beam steering that is a function of angle, time, and range which allows the FDA antenna to transmit the energy along the prespecified range and angle direction. In addition, we consider the time-variant beampattern aspect of an FDA, which has normally been ignored in the literature. In this study, we present the mathematical fundamentals of FDA antenna and why it could be exploited for wireless communication systems. Furthermore, FDA using Butler matrix for communication has been discussed. Performance analysis in terms of transmit beampattern, signal-to-interference-and-noise ratio (SINR), and direction of arrival has been presented and compared with that of phased array antenna.

Phase Control and Calibration Characteristics of Optically Controlled Phased Array Antenna Feed Using Multiple SMFs

2011 ◽  
Vol E94-C (10) ◽  
pp. 1634-1640 ◽  
Author(s):  
Daiki TAKEUCHI ◽  
Wataru CHUJO ◽  
Shin-ichi YAMAMOTO ◽  
Yahei KOYAMADA
Keyword(s):  
Phased Array ◽  
Phase Control ◽  
Array Antenna ◽  
Antenna Feed ◽  
Phased Array Antenna
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