An octave bandwidth frequency independent dipole antenna

TL;DR

This paper presents a wide-band fat-dipole antenna with a sinusoidal profile that maintains frequency-independent performance over an octave bandwidth, suitable for precise cosmic radio background measurements.

Contribution

The paper introduces a novel sinusoidal profile design for a fat-dipole antenna achieving octave bandwidth frequency independence validated through electromagnetic modeling and prototype testing.

Findings

Input return loss exceeds 15 dB across the band

Radiation pattern remains cosine square and frequency invariant

Design validated with a constructed prototype

Abstract

Precision measurements of the spectrum of the cosmic radio background require frequency independent antennas of small electrical dimensions. We describe the design of a wide-band fat-dipole antenna with a sinusoidal profile having a frequency independent performance over the octave band 87.5 to 175 MHz. The input return loss exceeds 15 dB and the radiation power pattern is frequency invariant and close to cosine square over the octave bandwidth. The structure has been optimized using electromagnetic modeling, and the design has been validated by constructing a prototype.