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PRODID:IEEE vTools.Events//EN
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DTSTART:20210314T030000
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DTSTART:20201101T010000
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BEGIN:VEVENT
DTSTAMP:20201226T063630Z
UID:AC5A277C-FCC9-4A66-B04F-DF28469490F4
DTSTART;TZID=Canada/Pacific:20201222T190000
DTEND;TZID=Canada/Pacific:20201222T200000
DESCRIPTION:Speaker: Md. Nazmul Hasan\n\nVivaldi antennas are planar travel
 ing wave antennas which have wide bandwidth. Ultra-wide band (UWB) antenna
 s are a category of wide band antennas that operate with narrow pulses. Fo
 r the UWB antenna\, the investigation of dispersion characteristics is ess
 ential\, unlike narrowband antennas. Dispersion means the stretching of va
 rious frequency components of the signal. This stretching of various frequ
 ency components of the signal distorts it which is undesirable effect. One
  way to quantify dispersion is by observing the group delay. For UWB anten
 nas\, the group delay must remain constant with respect to frequency. A fl
 at group delay indicates the phase of the transmission coefficient (S21) i
 s linear with respect to frequency. This ensures the signal from antenna i
 s free from dispersion. In this talk\, the simulation of Vivaldi antenna w
 ill be presented in HFSS. After that\, the measurements of the group delay
  and S21 by using a VNA will be demonstrated.\n\nCo-sponsored by: UBC Radi
 o Science Lab\n\nVirtual: https://events.vtools.ieee.org/m/250875
LOCATION:Virtual: https://events.vtools.ieee.org/m/250875
ORGANIZER:dmichelson@ieee.org
SEQUENCE:2
SUMMARY:HFSS Simulation and VNA Measurement of Transmission Coefficient and
  Group Delay of UWB Vivaldi Antenna
URL;VALUE=URI:https://events.vtools.ieee.org/m/250875
X-ALT-DESC:Description: <br /><p>Speaker: Md. Nazmul Hasan</p>\n<p>Vivaldi 
 antennas are planar traveling wave antennas which have wide bandwidth. Ult
 ra-wide band (UWB) antennas are a category of wide band antennas that oper
 ate with narrow pulses. For the UWB antenna\, the investigation of dispers
 ion characteristics is essential\, unlike narrowband antennas. Dispersion 
 means the stretching of various frequency components of the signal. This s
 tretching of various frequency components of the signal distorts it which 
 is undesirable effect. One way to quantify dispersion is by observing the 
 group delay. For UWB antennas\, the group delay must remain constant with 
 respect to frequency. A flat group delay indicates the phase of the transm
 ission coefficient (S21) is linear with respect to frequency. This ensures
  the signal from antenna is free from dispersion. In this talk\, the simul
 ation of Vivaldi antenna will be presented in HFSS. After that\, the measu
 rements of the group delay and S21 by using a VNA will be demonstrated.</p
 >
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