Method of measuring the amplitude directivity pattern of parabolic mirrored antennas in the audio frequency range

A. V. Sadchenko; O. A. Kushnirenko; M. T. Al’khamidi; A. M. Alkhadi

doi:10.15222/TKEA2016.1.08

A. V. Sadchenko Odesа Polytechnic National University, Odesа, Ukraine
O. A. Kushnirenko Odesа Polytechnic National University, Odesа, Ukraine
M. T. Al’khamidi Odesа Polytechnic National University, Odesа, Ukraine
A. M. Alkhadi Odesа Polytechnic National University, Odesа, Ukraine

DOI: https://doi.org/10.15222/TKEA2016.1.08

Keywords: directivity pattern, directional factor, aperture, direct focal reflector antenna, polygon measurements method, equivalent audio frequency

Abstract

Directivity pattern (DP) or graphical representation of the dependence of gain factor (directivity gain) of antennas on the direction of the antenna in the target plane is the main characteristic that describes its directional properties. Running DP measurements directly in the microwave range is very expensive. While generating and receiving devices for the acoustic frequency range are reasonably priced.
In this paper, we propose a method for measuring the amplitude directivity pattern of parabolic mirrored antennas on the basis of sound equivalent, which is based on the identity of the numerical values of the directivity gain of microwave range, and at audio frequencies.
The paper presents analytical expressions for the calculation of equivalent frequency and defines the requirements for the minimum size of the antenna.
The paper contains a modified block diagram for an amplitude directivity pattern meter for parabolic mirrored antennas in the audio frequency range.

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