Ultrabroadband phased-array radio frequency (RF) receivers based on optical techniques

2014 ◽  
Author(s):  
Brock M. Overmiller ◽  
Christopher A. Schuetz ◽  
Garrett Schneider ◽  
Janusz Murakowski ◽  
Dennis W. Prather
Keyword(s):  
Radio Frequency ◽  
Phased Array ◽  
Optical Techniques ◽  
Rf Receivers

Smart Antennas for Automatic Radio Frequency Identification Readers

2009 ◽  
pp. 449-473 ◽  
Author(s):  
Nemai Chandra Karmakar
Keyword(s):  
Radio Frequency ◽  
Frequency Band ◽  
Radio Frequency Identification ◽  
Phased Array ◽  
Smart Antennas ◽  
Phased Array Antenna ◽  
Location Finding ◽  
Input Multiple Output ◽  
Frequency Identification ◽  
Rfid Readers

Various smart antennas developed for automatic radio frequency identification (RFID) readers are presented. The main smart antennas types of RFID readers are switched beam, phased array, adaptive beamfsorming and multiple input multiple output (MIMO) antennas. New development in the millimeter wave frequency band?60 GHz and above? exploits micro-electromechanical system (MEMS) devices and nano-components. Realizing the important of RFID applications in the 900 MHz frequency band, a 3×2-element planar phased array antenna has been designed in a compact package at Monash University. The antenna covers 860-960 GHz frequency band with more than 10 dB input return loss, 12 dBi broadside gain and up to 40° elevation beam scanning with a 4-bit reflection type phase shifter array. Once implemented in the mass market, RFID smart antennas will contribute tremendously in the areas of RFID tag reading rates, collision mitigation, location finding of items and capacity improvement of the RFID system.

Research on Optimal Search of Phased Array Radar Based on Radio Frequency Stealth

2012 ◽  
Vol 6 (1) ◽  
pp. 328-332 ◽  
Author(s):  
Zhenkai Zhang ◽  
Jianjiang Zhou ◽  
Weiqiang Liu ◽  
Fei Wang
Keyword(s):  
Radio Frequency ◽  
Phased Array ◽  
Optimal Search ◽  
Phased Array Radar

scholarly journals A Comparative Study of On-Body Radio-Frequency Links in the 420 MHz–2.4 GHz Range

Sensors ◽  
2018 ◽  
Vol 18 (12) ◽  
pp. 4165 ◽  
Author(s):  
Arno Thielens ◽  
Robin Benarrouch ◽  
Stijn Wielandt ◽  
Matthew Anderson ◽  
Ali Moin ◽  
...  
Keyword(s):  
Comparative Study ◽  
Radio Frequency ◽  
Phased Array ◽  
Beam Steering ◽  
Path Loss ◽  
Mitigation Strategies ◽  
Body Area ◽  
The Right ◽  
Path Loss Measurements ◽  
Selection Of

While there exists a wide variety of radio frequency (RF) technologies amenable for usage in Wireless Body Area Networks (WBANs), which have been studied separately before, it is currently still unclear how their performance compares in true on-body scenarios. In this paper, a single reference on-body scenario—that is, propagation along the arm—is used to experimentally compare six distinct RF technologies (between 420 MHz and 2.4 GHz) in terms of path loss. To further quantify on-body path loss, measurements for five different on-body scenarios are presented as well. To compensate for the effect of often large path losses, two mitigation strategies to (dynamically) improve on-body links are introduced and experimentally verified: beam steering using a phased array, and usage of on-body RF repeaters. The results of this study can serve as a tool for WBAN designers to aid in the selection of the right RF frequency and technology for their application.

scholarly journals Opto-VLSI-Based Beamformer for Radio-Frequency Phased-Array Antennas

2012 ◽  
Vol 4 (3) ◽  
pp. 912-919 ◽  
Author(s):  
F. Xiao ◽  
B. Juswardy ◽  
K. Alameh ◽  
S. Xiao ◽  
W. Hu
Keyword(s):  
Radio Frequency ◽  
Phased Array ◽  
Phased Array Antennas ◽  
Array Antennas
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