Miniaturized On-PCB RF Filter Design Based on Electromagnetic Bandgap Structure

This paper proposes a new Electromagnetic Band-Gap (EBG) Structure based filter design. This on-PCB filter imitates the functionality of a discrete low-pass filter without any of the associated Bill of Materials (BOM) costs. The methodology of constructing the EBG filter is explained in detail, making use of classical filter theory including tapering and multiple elements that enable tradeoffs between roll-off, rejection, and pass-band ripple. Furthermore, techniques such as multi-layer modulation and diagonal vias are utilized to reduce the physical footprint of the design. This addresses the limitation of prior designs which caused them to be inefficient due to their excessive area requirements and unmanageable pass-band ripple. Modeling and simulation was done using Computer Simulation Technology (CST), with the filter exhibiting a pass-band from 6–7 GHz and a stop-band from 8.45-22 GHz.