Antenna Engineering Lecture 0: Introduction

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1 Antenna Engineering Lecture 0: Introduction ELC 405a Fall 2011 Department of Electronics and Communications Engineering Faculty of Engineering Cairo University

2 2 Outline 1 Why Study Antenna Engineering? Electromagnetic Spectrum Recent Advances Electromagnetic Wave Propagation This Course 2 Definitions of Antennas Pictures of Antennas

3 3 Outline 1 Why Study Antenna Engineering? Electromagnetic Spectrum Recent Advances Electromagnetic Wave Propagation This Course 2 Definitions of Antennas Pictures of Antennas

4 Electromagnetic Spectrum Applications 4 Band name Abbr. ITU Band Frequency Wavelength Example Uses Low Frequency LF khz 10 1 km AM long-wave broadcasting. Medium Frequency MF khz 1 km 100 m AM (medium-wave) broadcasts. High Frequency HF MHz 100 m 10 m Shortwave broadcasts, amateur radio, aviation communications. Very High Frequency VHF MHz 10 1 m FM, television, ground-to-aircraft and aircraft-to-aircraft communications. Ultra High Frequency UHF MHz 1 m 100 mm Television, microwave ovens, mobile phones, wireless LAN, Bluetooth. Super High Frequency SHF GHz mm Microwave devices, wireless LAN, most modern radars, satellite. The antenna is an important component in any wireless communication system!

5 Recent Advances IEEE Spectrum, Sept

6 Electromagnetic Wave Propagation Typical System 6 Source/ Transmitter Medium Load/ Receiver

7 Electromagnetic Wave Propagation Guided vs. Unguided Propagation 7 Guided Propagation Unguided Propagation Transmission Lines, Waveguides, Optical Fibers, etc. Propagation in Free-Space (Ideal) Propagation in the Atmosphere.

8 This Course Topics in This Course 8 Introduction to Antennas and Radiation Mechanism Radiation Integrals Basic Antenna Parameters Types of Antennas Antennas in Receiving Mode Antenna Arrays Microwave Link Design

9 This Course Course Objectives 9 Lecture 1 Lecture 2 Lecture 3 Lecture 4 Explanation of the radiation mechanism. Computation of the radiation integrals. Characterization of antennas by their parameters. Differentiation and analysis of the different types of antennas. Lecture 5 Analysis of antennas in receiving mode. Lecture 6 Analysis and design of linear antenna arrays and their feeding networks. Lecture 7 Design a microwave link taking into account tropospheric effects.

10 This Course Course Grade Distribution 10 Midterm Exam: 20% Projects/Reports/Quizzes: 10% Final Exam: 70%

11 This Course Course Webpage: EgyptEducation.org (Moodle) 11 Create an account on egypteducation.org Enroll in the course using the enrollment key Check the course page for the lectures, exercises, animations, announcements etc. Make sure messages are not directed to the spam/junk folders.

12 12 Outline 1 Why Study Antenna Engineering? Electromagnetic Spectrum Recent Advances Electromagnetic Wave Propagation This Course 2 Definitions of Antennas Pictures of Antennas

13 Antenna Definitions What is an Antenna? 13 An antenna is a device that launches/picks up electromagnetic power. Wikipedia: An antenna (or aerial) is a transducer designed to transmit or receive electromagnetic waves. Any other definitions?

14 Pictures of Antennas Wire, Horn and Conical Antennas Helical Antenna 14 Monopole Radio Conical Antenna Dipole Antenna Horn Antenna Conical Spiral Antenna Disc-Cone Antenna

15 Pictures of Antennas Printed Antennas and Yagi Arrays 15 Microstrip Antenna Array Yagi Antenna Printed Vivaldi Antenna Three-Sector Telephone Site

16 Pictures of Antennas Reflector Antennas 16 Arecibo Observatory Reflector The largest reflector on Earth (305 m)

17 17 Conclusion Applications operating in different RF bands. Guided and unguided propagation. Antenna miniaturization, efficiency improvement and multiband/wideband operation. Definitions of antenna. Pictures of some antenna types.

Antenna Engineering Lecture 0: Introduction

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