Subject Name: Microwave and Radar Subject Code: 10EC54 Subject Name: Microwave and Radar – Unit 5 Subject Code: 10EC54 Prepared By: Lakshmi C R, Dharani K G Department: ECE Date: 10.11.14 Subject Name: Microwave and Radar Subject Code: 10EC54 Prepared By: Lakshmi C R Department: ECE Date: 22.8.14 22/8/14

Microwave Passive Devices Unit 5 Microwave Passive Devices

Topic Details Co axial Connectors Adaptors Phase Shifters Attenuators Waveguide Tees Magic Tees

They also useful as power combiner Configuration: E-Plane and H-Plane Tee Wave guide Tee Junctions are “Three port Networks”, used to split the power to an another waveguide based systems from the main wave guide. They also useful as power combiner Configuration: With the main waveguide - a similar piece of waveguide is connected (fastened) as series or shunt. The added secondary arm may be called “Side arm” or “Auxiliary arm” The main arm may be called “Collinear arm” or “Primary am” Depends on the parallel field to the side arm, which will be split into, the name for Tee junction is given as “E-Plane” and “H-Plane” Tee Junctions

E-Plane Tee H-Plane Tee

Magic Tee Magic Tee is a four-port junction, combination of E-plane and H-Plane, so called “Hybrid Junction Tee” Since E and H Plane Tee’s are combined, we can see both the properties simultaneously. Applications: Isolator; Matching device; Phase shifter; Duplexer; Mixer..

Characteristics of Magic Tee If two same in-phase signals are given at port-1 and 2: The output at port-3 will be zero, but at port-4 will be additive. Since at the junction, the electric field become phase-lag and magnetic field as phase-lead – This total power available at the respective outputs will be zero If the input is given to the port-4: It will equally split the port to port-1 and port-2 (with opposite polarity) , and no power to port-3 (so for port-4, port-3 is isolated) 3.And when the power is fed into port-3:

Co axial Connectors Co axial connectors are connected to other cables The outer shield makes a 360 degree extreamely low impedence joint to maintain shielding integrity The connectors are of various types depending on frequency range and cable diameters The commonly used connectors are BNC,APC,TNC

Adaptors An adapter or adaptor is a device that converts attributes of one device or system to those of an otherwise incompatible device or system. The term is often used to refer to AC adapters

The Two port network has following modules: Phase shifter Based on the “Faraday Rotation”, phase shift were been proposed in Microwave circuits. Those component are called “Gyrator” The Two port network has following modules: 90 degree Twist Ferrite component with 90 degree phase shift

Attenuators Attenuators are passive devices used to control power levels in microwave system by partially absorbing the transmitted signal wave. A coaxial fixed attenuator uses a film with losse on the center conductor to absorb power Fixed attenuators in circuits are used to lower voltage, dissipate power, and to improve impedance matching In measuring signals, attenuator pads or adapters are used to lower the amplitude of the signal a known amount to enable measurements, or to protect the measuring device from signal levels that might damage it. Attenuators are also used to 'match' impedance by lowering apparent SWR