Post on 02-Feb-2023
Optimisation of the
symmetrical UWB TEM horns
by matching
Efimova N.A., Kaloshin V.A.
Moscow Technical University of the
Communication and Informatics
Kotel’nikov Institute of the
Radio-engineering and Electronics RAS
ТЕМ horn
Geometry of a ТЕМ-horn
Advantages:
Simplicity
Adaptability
to manufacture
Broadbandness
High gain
Directivity
Disadvantages:
Big electrical size
Big difference
between angles α and
β
Instability of the phase
center
2
α
2a
β
x
4
Coefficient of the reflection of the main mode by end of the plane waveguide
00 1
1
0 1,
,1 2
q
q
qe
R qe
1
1
(0,0, ), 0 1
(0,0,2)
(0,0, ),1 2
(0,0,2)
effi
n
eff i ii
n
i i
q i
eff
iq eff i
eff
eff
g ce q
gR
q g ce q
q g
Coefficient of the reflection of the main mode by end of the regular horn
11
1
(0,0, ), 0 1
(0,0,2)exp( 2 )
(0,0, )2,1 2
(0,0,2)
eff j
n
eff j jj
n
j j
q j
effn
q eff jj
eff
eff
g ce q
gR I IkLj
q g ce q
q g
d
deff
Coefficient of the reflection of the main mode by end of the irregular horn
-30
-25
-20
-15
-10
-5
0
0 1 2 3 4 5
-30
-25
-20
-15
-10
-5
0
0 1 2 3 4 5
Accuracy test of the model
5
-30
-25
-20
-15
-10
-5
0
0 1 2 3 4 5
-30
-25
-20
-15
-10
-5
0
0 1 2 3 4 5
Proposed model Finite element method
Optimisation of the TEM horn,
made from 8 section
β1 = 16.61º, β2-β6 – see fig., β7 = 340º, β8 = 340º 6
20
30
40
50
60
70
80
90
100
0,95 1,05 1,15 1,25
β2
β3
β4
β5
β6
угол,
kamin
0,8
0,85
0,9
0,95
1
1,05
1,1
4 6 8 10 12 14
kamin
Kamin VS number of the horns
section
7
Sections number, n
Coefficient of the reflection VS
ka
kamin on level -10dB 0.8134
Broadbandness 1:22 9
-30
-25
-20
-15
-10
-5
0
0 5 10 15 20
Radiation pattern
10
-10
-8
-6
-4
-2
0
2
4
6
8
10
-180 -120 -60 0 60 120 180
-10
-8
-6
-4
-2
0
2
4
6
8
10
-180 -120 -60 0 60 120 180
E-plane H-plane