Patent ID: 9698495
Date: 2017-07-04
CPC Classifications: H01Q

Claim:
1. A reconfigurable multiple-input-multiple-output (MIMO) and sensing antenna system, comprising: a planar, rectangular dielectric substrate having opposing long peripheral edges and opposing short peripheral edges, and having a top surface and a bottom surface; a first and a second Planar Inverted-F antenna (PIFA) element disposed on the top surface of the dielectric substrate, each of the PIFA elements having an F-head portion defining two arms extending to one of the long peripheral edges, respectively, of the rectangular dielectric substrate, and each of the PIFA elements having an F-tail portion extending from the same short peripheral edge of the rectangular dielectric substrate, a meander pattern of conducting material extending from a bottom region of the F-tail portion of each of the PIFAs the first PIFA element and the second PIFA element being mirror images of each other, each of the PIFA elements further having: an ultra-wide band (UWB) sensing element disposed on the bottom surface of the rectangular dielectric substrate; a ground plane element for the UWB sensing element, the ground plane element being disposed on the top surface of the rectangular dielectric substrate; shorting elements extending from the F-head portion of each of the PIFA elements to the UWB sensing element, the UWB sensing element also providing a reference ground plane for the first and second PIFA elements; wherein the PIN diodes switch the diode circuits across the PIFA radiating branches, the UWB sensing element senses band availability, and the variable capacitance (varactor) diodes fine tune the first and second PIFA elements.