Horns, whistles, bite blocks, and straws: A review of tools ...
Optimization of the symmetrical UWB TEM horns by matching
11
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
Transcript of Optimization of the symmetrical UWB TEM horns by matching
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
3
Irregular ТЕМ-horn
x
a
α
E-plane Section
L β1/2
βi/2
βn/2
x d1
φn-1
H-plane Section
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
Result of the optimisation
Isometric E-plane section 8
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
Thank you for attention
11
