Operating Frequency Extension of Surface Assembled Microwave Components
A novel transition from microstrip and coplanar lines to the specific signal interfaces of usual surface assembled components is considered in this paper. It is aimed to improve the bandwidth of printed circuit board (PCB) based packages, provided by smaller values and better geometry controlled parasitic elements due to proposed structure. Moreover, the same interface model is compatible with surface assembly of substrate integrated waveguide components. Guidelines for component values preliminary calculation and optimization are presented. Microstrip test circuits were accordingly manufactured for design verification, with satisfactory results up to 8 GHz. The relative permittivity of FR-4 substrate material used in our experiments is considered the solely responsible for certain differences existing between simulated and experimental data, because they became effective after PCB manufacturer was replaced.
surface mount assembly coplanar waveguide microstrip line low-pass filter substrate-integrated waveguide