Microwave Communication & Engineering1. Unit-1
2. Unit-2
3. Unit-3
4. Unit-4
5. Unit-5
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Microwave Communication & Engineering SyllabusUNIT – I Wave Propagation: Sky wave: Surface wave; space wave: Field and Range Calculation. Ionosphere Propagation –Refractive Index at High Frequencies. Mechanism of Radio Wave Bending, Critical Frequency. Effect of Earth’s Magnetic Field. Effective Dielectric Constant and conductivity. MUF .Skip Distances. Optimum Working Frequency. Multihop propagation .Ionospheric Abnormalities. Tropospheric Propagation. Field Strength of Troposphere wave. Effect of Earth’s Curvature and Dielectric Constant. Tropospheric Scatter and Duct propagation UNIT – II Microwave Linear Beam and Crossed-Field Tubes: Failure of conventional tube at high frequency; KlystronVelocity modulation; Bunching; output power and loading; Reflex klystron-Velocity modulation; power output and efficiency and electronic admittance; Helix traveling wave tubes; amplification process; Conventional current; Electric field wave modes; Basic principle of coupled cavity; Magnetron-Types and Principles of operation; Modes of oscillation; Strapping; pi-mode separation. UNIT – III Microwave Devices : Transistors, Tunnel Diodes and Microwave FETs: Structure; Operation; Characteristics and Power frequency limitations of microwave transistors; Tunnel diodes and Field-Effect Transistors. Transfer Electron Devices: Gunn diode; Gunn effect; Principle and Mode of operation; Microwave generation and amplification Tunnel Diode; PIN diode and Crystal diode. Avalanche Transit- Time Devices: Physical Structure; Principle of operation; Characteristics; Power output and Efficiency of IMPATT, TRAPATT and BARITT Diodes; Parametric amplifiers. UNIT – IV Microwave Components and Measurement: Rectangular cavity resonators; Q of a cavity resonator; Reentrant cavities; Slow-wave structure; Microwave hybrid circuits; S-parameters and their properties; Wave guide tees ; Hybrid ring; Waveguide corners bends and twists; Two hole directional coupler; S- Matrix; Circulators and Isolators; Hybrid couplers, MICROWAVE MEASUREMENT: Microwave bench; Precautions; Power measurement; Bolometric method; Attenuation; VSWR; Impedance, Frequency and Q of the Cavity. UNIT – V Microwave Filters: Periodic structures – Analysis of infinite periodic structures and terminated periodic structures, Filter design by image parameter method – Constant k, m-derived and composite. Filter design by insertion loss method. Filter transformation and implementation. |