Horn Antennas by 7svQt4y

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									Horn Antennas
INEL 6069
Dr. Sandra Cruz-Pol
ECE, UPRM



CAPT 13
Horn Antennas
   Invented in late 1800’s. Studied in 1930’s
   Most widely used microwave antenna
   Used as feed element
       Radio astronomy
       Satellite tracking
       Communication dishes
   Universal standard for calibration and gain
    measurement of other antennas.
Types
   H-plane
   E-plane
   Pyramidal
   Conical
         H-plane horn Antenna
l/b DH




                a1 /l
Directivity - H-plane horn
   Can be computed from
      DH 
           4U m ax 4 b 2
             Prad
                   
                      a1l
                                
                            C (u )  C (v)2  S (u )  S (v)2   
   Or from
                                                  b    GH
              a1     50                    DH 
        A                                        l     50
              l     h / l                             h / l

GH and D are plotted on the fig.13.16 &17 of Balanis.
 HPBW is found from fig. 13.15.
Fig 13.17
E-plane
horn


             b1 / 2
tan 2 e 
              1
Directivity - E-plane horn
   Can be computed from
            4U max 64 a1     2 b
                                              b1       
       DE                   C          S 2          
                                                           
                                    1
                      b1l      2l  1        2l 
              Prad                                  1   
                                                            
   Or from
                                                           a    GE
                          b1     50               DE 
                     B                                    l     50
                          l     e / l                          e / l

GE from fig. 13.9 and D is plotted on the fig.13.8 of Balanis.
 HPBW is found from fig. 13.7.
         E plane horn antenna
l/a DE




                                  2e
                          b1 /l
Pyramidal Horn

       1           GE GH
Dp 
     32 /      50       50
                h / l e / l


                      l   2
              Dp               DE DH
                     32 ab
Optimum pyramidal horn design

                            3l               l
   le  l h       lh  lo       le  lo 
                             8               4



       l     2
                    D0 e  D0 h 
Dp        DE DH                  
     32 ab        32  a / l  b / l 

								
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