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