Complete the antenna problems below in your notebook (handwriting). Then take a photo of your work and submit it via this form. Please note that the PDF file must not exceed 1MB.
1. Explain the following
- Effective Aperture & Types of Apertures.
- Polarization & Types of Polarization.
- Beam Width and Directivity
- Write short notes on Radiation Pattern and Beam Efficiency.
2. Explain the following
- Beam Area and radiation intensity.
- Effective Height of Antenna and Antenna Temperature.
- Front to Back Ratio and Antenna Theorem.
- Retardation Potential and Basic Maxwell Equation.
3. Derive expression for Electric and Magnetic Field radiated by Half Wave Dipole and Sketch its Field Strength pattern.
4. Find the length of half wave dipole at 80MHz.
5. Explain the following
- What is meant by radiation pattern?
- What is meant by front to back ratio?
- What are the field zones?
- What are the different types of aperture?
6. Explain the following
- Construction and operation of Yagi-Uda antenna.
- Compare fields of small loop and short dipole.
- Directivity of small and large loop.
- Derive the expression for radiation resistance of small loop antenna.
7. Design Yagi-Uda antenna of six elements to provide a gain of 12db if the
operating frequency is 440 MHz
