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.