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Microstrip to SIW transition | SIW to Microstrip Transition

This page covers Microstrip to Substrate Integrated Waveguide (SIW) transition or SIW (Substrate Integrated Waveguide) to Microstrip Transition. The formula or equations to calculate width of this transition are also mentioned.

We have seen use of two wire cables and coaxial cables for transmission of EM waves. These types of transmission lines result into radiation loss, skin effect, copper loss and dielectric loss. Moreover as they are non planar integration with planar circuit and components is complex task.

Metallic waveguides are used as better options compare to these traditional transmission line types. But they are bulky and non-planar in nature.

SIW is used as alternative option for metallic waveguides and will overcome limitations of it. SIW stands for Substrate Integrated Waveguide.

SIW-Substrate Integrated Waveguide

SIW is planar structure. It is fabricated using two rows of metallic via holes connecting top and bottom planes which are grounded. The dielectic is used as the middle layer of SIW. Like microstrip lines and coplanar lines SIW components are compact, light, cost effective and easy to fabricate.

Microstrip transition taper

The figure-2 depicts microstrip line to SIW taper or transition.

Microstrip to SIW transition Width calculation formula

SIW is fabricated on planar circuits which requires to be integrated to planar transmission lines such as microstrip lines. This requires microstrip to SIW transition as shown in the figure-2.

Microstrip to SIW transition width formula

The microstrip line width by height can be determined as per equation above. Equations uses microstrip width "W" and waveguide width "Ag".

SIW | Substrate Integrated Waveguide Related

What is SIW
Difference between DFW and SIW
SIW operating mode
Advantages and Disadvantages of SIW

Types of Transmission Lines

stripline basics and types
Microstrip line variants
Slotline basics and types
Finline basics
CPW(Coplanar Waveguide) basics

Transmission Line Transitions

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Coaxial to waveguide transition
Waveguide to microstrip transition
Microstrip to slotline transition

What is Difference between

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Difference between SISO and MIMO
difference between TE11 and TM11 mode
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difference between TE and TM wave
Rectangular vs circular waveguide
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waveguide isolator vs microstrip isolator

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