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A novel, miniaturised, planar inverted FF antenna (PIFFA) assembly is presented. The antenna design electromagnetically couples two PIFA antennas on an air substrate, and employs a broadband rectangular plate feeding mechanism to achieve an ultra-wideband characteristic. The dimensions of the complete prototype assembly are 30 ?? 15 ?? 8 mm. Good agreement is obtained between computed and measured...
Low-threshold current density InAs quantum dash lasers are demonstrated by reducing the energy inhomogeneous broadening through an optimised double-cap technique. A threshold current density for an infinite cavity length of 225 A/cm2 (~45 A/cm2 per stack) is obtained from a five-stack laser structure. The characteristic temperature above room temperature is 52 K, and this relatively low value results...
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