A novel non-Foster broadband patch antenna

We propose a novel antenna matched with non-Foster circuit. A simple narrow resonant patch is transformed into a extremely broadband antenna (with impedance bandwidth less than -10dB) starting from an aperture size λ/30×λ/30 up to λ/13×λ/13. Patch is supported by a Rogers 6010 dielectric substrate. non-Foster circuits are added at a two-step procedure. First, an additional port is introduced inside the antenna and a series negative network is applied at that port. The topology and values of the elements are obtained from simple graphical formulas. As a result the real part of input impedance is greatly enhanced reaching values close to those of feeding network. At the second step negative matching is added at the input of the antenna to match the imaginary part of input impedance.