Microwave

RF front end

Engineering

Materials science

Planar

Computer graphics (images)

Radio frequency

Telecommunications

Computer science

Electronic circuit

Power dividers and directional couplers

Microstrip

Multiplexing

Waveguide

Electronic engineering

Microwave transmission

Diplexer

Transmission line

Extremely high frequency

Optoelectronics

Multiplexer

Electrical engineering

Electronics

Substrate-integrated waveguide (SIW) is a modern day (21st century) transmission line that has recently been developed. This technology has introduced new possibilities to the design of efficient circuits and components operating in the radio frequency (RF) and microwave frequency spectrum. Microstrip components are very good for low frequency applications but are ineffective at extreme frequencies, and involve rigorous fabrication concessions in the implementation of RF, microwave, and millimeter-wave components. This is due to wavelengths being short at higher frequencies. Waveguide devices, on the other hand, are ideal for higher frequency systems, but are very costly, hard to fabricate, and challenging to integrate with planar components in the neighborhood. SIW connects the gap that existed between conventional air-filled rectangular waveguide and planar transmission line technologies including the microstrip. This study explores the current advancements and new opportunities in SIW implementation of RF and microwave devices including filters, multiplexers (diplexers and triplexers), power dividers/combiners, antennas, and sensors for modern communication systems.

A Review on SIW and Its Applications to Microwave Components