antena dan propagasi

1. Conical horn
antenna
ANTENNA AND PROPAGATION
BY MAFATIKHUL ILMI

2. Introduction
A horn antenna or microwave horn is an antenna that
consists of a flaring metal waveguide shaped like
a horn to direct radio waves in a beam.

3. Typical horn antenna

4. Conical horn
A horn in the shape of a cone, with a circular cross
section. They are used with cylindrical waveguides.

5. Geometry of conical horn

6. characteristic
1. The gain of horn antennas ranges up to 25 dBi,
with 10 - 20 dBi being typical.
2. The usable bandwidth of horn antennas is
typically of the order of 10:1, and can be up to
20:1 (for example allowing it to operate from
1 GHz to 20 GHz)
3. Horns are widely used as antennas
at UHF and microwave frequencies, above
300 MHz.

7. Directivity of a
conical horn as a
function of aperture
diameter and for
different axial horn
lengths.

8. Simulation
impedansi input untuk setiap perubahan
sudut flare dan εr=3.0.
Simulasi VSWR untuk perubahan sudut flare
dan εr=3.0

9. radiation Pattern

10. conical design
𝑑 𝑚 = 2. 𝑎 ≃ 3𝜆𝑙
𝜆 =
𝑐
𝑓
𝐿 𝑠 ≃ 0.8 − 1.71𝑠 + 26.25𝑠2 − 17.79𝑠3
𝑠 =
𝑑 𝑚
2
8𝜆𝑙

11. Conical implementation
conical scanning
Horn reflector
1.Radar guns,
2.as standard calibration antennas to
measure the gain of other antennas
3.microwave radiometres.

12. Reference
[1] C. A. Balanis, “Antenns Theory : Analysis And Design,” Third Edition, 739 – 785,
2005.
[2] Carlos del Río Bocio, “High performance horn antenna design (II)”.
[3] George S. Kliros, “Simulated Performance of Conical Antennas Using Matlab-
Based Finite-Difference Time Domain (FDTD) Code”
[4] Mr.A.B.Crawford, Horn Antena (Horn Antena Reflector), [online],
(http://www.nps.gov/history/history/online_books/butowsky5/astro4k.htm, diakses
tanggal 19 Mei 2014)
[5] http://en.wikipedia.org/wiki/Conical_scanning, diakses tanggal 19 Mei 2014.