EEE445_Lect01

# EEE445_Lect01 - Lecture 1 Objectives Motivate the study of...

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EEE591/445 1 Lecture 1 Objectives • Motivate the study of microwave circuit design. • Mention some of the aspects of microwave circuit design. • Review some of the skills that students should have developed in previous classes (or from work experience).

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EEE591/445 2 What is a “Microwave” • Electromagnetic waves with small wavelength – Small: 1 meter to 1 mm – “Micro”= small • Frequency range: 300 MHz to 300 GHz • “Classical” microwave frequency range: 1 GHz to 30 GHz
EEE591/445 3 Applications of Microwaves • Remote Sensing – Passive: radiometer – Active: synthetic aperture radar (SAR) • Radar: FMCW and pulse • Communications – 60 GHz communications • RF Heating – Mechanical welding and quenching – Cooking – Medical

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EEE591/445 4 What are some systems whose RF portion works in the frequency range of 300 MHz to 300 GHz? • UHF SATCOM (military) • UHF TV • Cell phones • Wireless LANs • Radar (aviation, military, weather, GPR) • Public service radios (police, fire) • Radio astronomy • Communication with space probes • Business and family service radios • Amateur radio •G P S • Microwave ovens • Secure comm systems for the military (LPI/LPD) •D B S • MMDS
EEE591/445 5 Microwave Engineering • Microwave frequency range: 300 MHz to 300 GHz. • Below 300 MHz, we can usually use circuit theory to design RF portion of transceiver. At worst, only the antenna needs to be analyzed using full-wave (full electromagnetic theory, Maxwell’s equations). • Above 300 GHz, we can usually use geometric optics (ray tracing) to design systems.

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EEE591/445 6 • Both circuit theory and geometric optics are special cases of the more general theory of electromagnetism (Maxwell’s equations). • In the microwave frequency range, neither of these approximations can be used to completely characterize the system. – Circuit theory can often be used to analyze much of the system from 300 MHz to 10 GHz.
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EEE445_Lect01 - Lecture 1 Objectives Motivate the study of...

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