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Small and Wideband Antennas
Over the years, our group has brought forward many innovations in small, thin and ultra-wideband (UWB) antennas. Current work in the area ranges from RF and up to millimeter wave frequencies beyond 100GHz. Some of the proposed apertures/arrays have allowed for up to 10 times smaller elements, and 4-5 times thinner apertures, and over 13:1 continuous bandwidth has been demonstrated experimentally. The ensuing concept is based on tightly coupled dipole arrays, often referred to as connected arrays, a concept originally proposed by the late Ben Munk.
Antenna and array miniaturization has been achieved via emulated in-plane anisotropy, leading to continuous theoretical bandwidth of as much as 36:1 bandwidths on a very thin (0.06l thick at the lowest frequency) substrate. These design have been supplemented with wideband feed networks and with reconfiguration circuits to control the bandwidth and band rejection regions. In addition, parasitic metallic frequency selective surfaces (FSSs) have been introduced to achieve low scanning angle down to 75o.