Design and Fabrication of Square Top-Loaded Monopole Antenna as the Loran Transmitter with Four Masts

Document Type : Original Article

Abstract

In  this  paper  design  method  and  measurement  results  of  the  antennas  with  square-toploadings (STL)  as  the
modified  versions  of  sectionalized  Loran  transmitter  (SLT)  antennas  are  presented.  An  advantage  of  the
proposed  antenna  is  the  improved  reactance  using  additional  toploaded  wires.  Comparison  between  the
proposed  antenna  and  previous  structures  indicates  that  the  radiation  resistance  is  multiplied  by  two  and  the
realized  gain  is  improved  6  dB.  The  final  structure  with  100  m  height  is  fabricated  and  its  photographs  are
indicated.  The  radiation  pattern  of  the  realized  antenna  is  obtained  by  turning  around  the  antenna  and
recording the  power  amplitude. The  position  of each  point  is obtained  using  GPS and  the  distance  differences
are compensated  for  the  radiation  pattern.  Therefore  a  symmetrical pattern  is  obtained  and  only  the  effects  of
natural  objects  like  mountains  or  large  buildings  are  observed  in  the  radiation  pattern.    Finally,  the  antenna
impedance is measured using vector network analyzer and the predicted results are validated successfully.
 

Keywords

References

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History

  • Receive Date: 18 April 2016
  • Revise Date: 06 March 2019
  • Accept Date: 19 September 2018
  • Publish Date: 22 May 2015

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