Antenna Thesis

Antenna Thesis-61
A Rectaxial antenna was designed at 2.45 GHz, which had excellent matching (S11 = -20d B) at the frequency of operation, and an omni-directional radiation pattern with a maximum gain of 2.69 d Bi as measured in a far-field anechoic chamber.Attempts were made to increase the frequency of operation but this proved unsuccessful.

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There were several antennas investigated in this thesis directly related to the Speckled Computing Consortiums objective of designing a 5mm3 ‘Speck’.

These antennas were conventional narrowband antenna designs operating at either 2.45 GHz or 5.8 GHz.

A review was conducted into relevant, suitable radio architectures such as, conventional narrowband systems, Ultra-Wide Band (UWB), and simplified radio architectures such as those based on the diode rectifier method, and Super Regenerative Receivers (SRR).

There were several UWB antennas designed, which operate over a 3.1 – 10.16 GHz operational band with a VSWR ≤ 2.

All the UWB antennas were required to transmit a UWB pulse with minimal distortion, which placed a requirement of linear phase and low values of group delay to minimise distortion on the pulse.

UWB antennas investigated included a Vivaldi antenna, which was large, directional and gave excellent pulse transmission characteristics.

The proposed MSA comprised of elliptical patch antenna with shorting pin. The design parameters are major and minor axis of elliptical patch, the position of shorting pin and feeding point of probe are mentioned in table-1.

The proposed antenna can provide optimized multi frequency by varying the above design parameters.

And for the second case, the work is as a novel design of a Pentagonal shaped patch antenna is presented for ultra wideband wireless communication applications.

Designed Microstrip patch antenna consists of a pentagonal patch which is found to resonant at frequency 4.8571 GHz, with return loss -19.65 d B having satisfactory radiation properties.

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