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An ultracompact bi-sectional tapered coupler, suitable for adiabatic mode transformation between a common single mode SOI strip waveguide and a Si/III-V hybrid waveguide, is proposed for Si/III-V heterogeneous integration. Since the bi-sectional tapered coupler mimics a semi-3D taper and avoids exciting unwanted high-order modes in the thick p-InP cladding layer (which is removed in the first tapered section), the length of the adiabatic mode coupler can be dramatically shortened. In the proposed structure, the length of the bi-sectional tapered coupler can be as short as 9.5 µm with a large fundamental mode-coupling ratio (over 95%) in a bandwidth of ~ 100 nm, and provides ±100 nm tolerance to misalignment even when the bonding layer is as thick as 50 nm. [ABSTRACT FROM AUTHOR]

A capacitively-loaded inductively-coupled fed loop RFID tag antenna with an omnidirectional radiation pattern is proposed. With an inductively-coupled feed structure, it is convenient and accurate to achieve conjugate impedance matching condition. Concentration of surface current on the radiating loop is beneficial to improving the gain of antenna. The radiation pattern which is omnidirectional in antenna plane makes the proposed tag practicable mounted on top or bottom of target objects. The length of the antenna is only 60 mm, and the maximum simulated read range of the prototype is 14 m with 4 W of EIRP. [ABSTRACT FROM AUTHOR]

A capacitively-loaded inductively-coupled fed loop RFID tag antenna with an omnidirectional radiation pattern is proposed. With an inductively-coupled feed structure, it is convenient and accurate to achieve conjugate impedance matching condition. Concentration of surface current on the radiating loop is beneficial to improving the gain of antenna. The radiation pattern which is omnidirectional in antenna plane makes the proposed tag practicable mounted on top or bottom of target objects. The length of the antenna is only 60mm, and the maximum simulated read range of the prototype is 14m with 4W of EIRP. [ABSTRACT FROM AUTHOR]