Antenna Project Essay

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Antenna Project DongGee Rho Dr. Seung Kim Advanced Electromagnetic Field and Waves November 01, 2014 Contents Definition 3 Principles 3 2.1 Modulation & Demodulation 4 2.2 Beams of Antenna 5 2.3 Reciprocity of Antenna 5 2.4 Principles of wireless communication 5 3. Terminology 6 3.1 Radiation Pattern (Beam Pattern) 6 3.1.1 Antenna Gaine 8 3.2 Resonance 9 3.2.1 Bandwidth 9 3.3 Antenna Impedance 9 3.3.1 Impedance matching 10 3.3.2 VSWR 10 3.4 Antenna Efficiency 10 3.5 Polarization 10 3.6 Frequency Bands 11 4. Models of Antenna 12 4.1 Wire Antennas 12 4.1.1 Dipole Antenna 12 4.1.2 Monopole Antenna 13 4.1.3 Folded Dipole Antenna 14 4.2 Travelling Wave Antennas 14 4.2.1 Yagi-Uda Antenna 14 4.2.2 Helical Antenna 14 4.3 Parabolic Antenna 15 4.4 Patch Antenna 15 5. Design of Yagi-Uda Antenna 16 5.1 Transmitter 16 5.2 Receiver 17 5.3 Designing Antenna 18 5.3.1 Parameters of Yagi-Uda Antenna 19 5.3.2 Theoretical Demonstration 21 5.4 Construction of Antenna System 22 5.5 Experiment & Result 23 References 24 Using Components 25 1. Definition The origin of the word ‘Antenna’ is feelers of insects. As feelers are used for detecting invisible signals, the antenna also has similar purpose and function. Antenna is an electrical device that converts the electric signal which is represented by voltage and current to the electromagnetic wave, or reversely converts the electromagnetic wave to the electric signal like figure 2. The electric signal is conveyed by the potential difference and the movement of electrons, so it can’t be delivered through free space. On the other hand, the electromagnetic wave can’t pass the conductor, but rather pass through non-conducted materials. For passing electric signals between two points in wireless communication, the antenna radiates the electromagnetic wave from electric

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