Tag: Academia – Antenna

BEE 4433 Antenna & Propagation : Radio Propagation

Today’s class is on the final chapter of Antenna & Propagation: Radio Propagation.

It is important for an antenna designer to understand the propagation concepts, as radio wave propagation and reception are heavily affected by them. Among topic that is included in this chapters are propagation model, mechanism and fading.

Assignment: Project (10%)

An instruction for Antenna Project Design has been uploaded in KALAM. The project involves to design a microstip antenna with circular polarization properties for application in GPS devices.

Assignment: Journal Review (10%)

Here, the assignment is to review 3 articles, either from the given articles in KALAM or from the one downloaded from Google Scholar / IEEExplore.

The video below shows the common practices in scientific article review.

BEE 4433 Antenna Theory – Antenna Measurement

Dec 31st, 2020

Good antenna measurements don’t just happen

https://www.antenna-theory.com/measurements/antenna.php

Today’s class covers the topic of antenna measurement, which is essential in antenna design verification process. There are a  number of techniques such as near field and far field. Measurement equipment for a typical antenna measurement setup are network analyzer, signal generator, positioner (turn table) and spectrum analyzer.

A good measuring setup presents minimal discrepancies between the measured and simulated results.

BEE 4433 Antenna Theory

Today’s class discusses the topic of antenna array – a very interesting subject in Antenna Design.

Arrays are adopted for communication devices that requires high precision, highly directive coverage. Similar to the radar operation, array antennas allows beam steering as well as interference nulling.

BEE4433 Antenna Theory and Propagation

Today’s class covers the chapter on Broadband Antennas, focusing on 2 main structure – helical antenna and log periodic dipole array.

Broadband antennas are preferred due to its wide band coverage properties. A single unit is able to cater various frequency applications.

For this chapter, students are required to:-

  1. watch the broadband antenna video and submit a concept inventory review via KALAM feedback
  2. answer tutorial no 4 regarding helical and LPDA antenna
  3. simulate a helical antenna structure and discuss the operating mechanism of the antenna

BEE 4433 Antenna Theory & Propagation

Week 5 – Revisit on antenna parameters, electrically small antenna, resonant antenna and antenna simulation.

It is a must for an antenna designer to be equipped with antenna modelling and simulation skills. From simulation results, the behavior of an antenna could be estimated hence giving a sense of confidence to pursue to the next stage of antenna design – fabrication and measurement.

BEE 4433 Antenna Theory and Propagation

Week 3 covers the topic of Electrically Small Antenna, which among the most attractive antenna structure due to it’s simplicity in the design process and compact size. However, these come with a trade off narrow bandwidth and low efficient radiancy.

For this chapter, please complete the following:-

  1. Electrically Small Antenna Video Review
  2. Complete Lab 1 on Dipole antenna design
    1. Simulate the halfwave dipole design
    2. Observe the following items and:-
      • describe the operating frequency of the dipole antenna,
      • describe the radiation characteristics of the antenna,
      • what are the influencing design parameters,
      • estimate the dimensions of a dipole antenna that will radiate at 1.8 GHz
    3. Submit your answers in a 2-page journal article format.The anatomy /structure of a journal article is explained here:-

 

This Lab assignment contributes 5% to the course works marks.

 

Video for class today is as follows:-

Class Video