A Low-Profile Tri-Band Microstrip GPS Circular Patch Antenna With Integrated MTM-EBGs

The Metamaterial-Based Electromagnetic Bandgap Structure (MTM-EBG) is a uniplanar, fully-printable, and compact structure that may be directly embedded in parallel-plate waveguide and microstrip (PPW and MS) environments for strong manipulation of the fundamental PPW TEM mode [1] . The MTM-EBG has been demonstrated to operate by interacting the underlying PPW mode with a "backwards" CPW mode, which is created by loading the mode with series capacitors and shunt inductors. The resulting coupling yields a strong bandgap which is adjustable both in its center frequency as well as bandwidth. Because the components loading the CPW mode are all on a single metallization layer, the MTM-EBG lies in a single plane with a solid conductor backing, and can be fully printed due to the small reactive loading values required.