Conical horn antenna ANTENNA AND PROPAGATION BY MAFATIKHUL ILMI
Conical horn antenna ANTENNA AND PROPAGATION
BY MAFATIKHUL ILMI
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.
Typical horn antenna
Conical horn
A horn in the shape of a cone, with a circular cross section. They are used with cylindrical waveguides.
Geometry of conical horn
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.
Directivity of a conical horn as a function of aperture diameter and for different axial horn lengths.
Simulation
impedansi input untuk setiap perubahan sudut flare dan εr=3.0.
Simulasi VSWR untuk perubahan sudut flare dan εr=3.0
radiation Pattern
conical design
𝑑𝑚=2.𝑎≃√3 𝜆𝑙
𝜆=𝑐𝑓
𝐿 (𝑠 )≃ (0.8−1.71𝑠+26.25 𝑠2−17.79𝑠3 )
𝑠=𝑑𝑚2
8 𝜆𝑙
Conical implementation
conical scanning
Horn reflector
1.Radar guns, 2.as standard calibration antennas to
measure the gain of other antennas
3.microwave radiometres.
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.