Search

A novel compact multi-band fractal antenna with RCS reduced is presented for Wi MAX, WLAN and ITV applications. The self-similarity property is designed to the square radiation patch and the fractal geometry is achieved by consecutive iterations. The 4th iteration of the proposed antenna, with a compact size of $\mathbf{24mm\times 30mm\times 0.508mm}$ , covers the 3.5GHz WiMAX band, 5.2/5.8GHz WLAN bands and ITV 8.025-8.4GHz band. Uniform radiation characteristics and an average gain of 3.1dBi are obtained. Furthermore, the RCS reduction of the proposed antenna are also presented and discussed.

A novel compact ultra-wideband (UWB) antenna with dual independent tunable band-notches is proposed. By adding a V-shaped strip connected to double annular slots via a hole to the end of the feeding-line, and etching a pair of L-shaped slots on the radiation patch, dual-band notched function in the WiMAX/WLAN is achieved. Results show that the designed antenna, with compact size of $\mathbf{20\times 36}\mathbf{mm}^{2},\mathbf{has}$ a impedance bandwidth of 3-10.8GHz for $\mathbf{VSWR} , except two frequency notched bands of 3.2-3.8 and 5-5.9GHz. Besides, this antenna exhibits stable antenna gain and good omnidirectional radiation patterns in the H-plane.

In this article, LTCC (Low temperature Co-fired ceramic) is used to design integrated antenna-TR module to meet the miniaturization of phased array in ka frequency band. Integrated antenna module has lower loss between antenna and TR than normal separate antenna and TR module, and make easier to expand large array. According to multi-layer LTCC integration criterion, characters of end-fire Qusi-Yagi antenna and multi-antenans buried in LTCC materials is optimized designed, high-gain and wide-angle scanning is realized.

The kinematic analysis of a 6-DOF (six-degree-of-freedom) force sensor whose design is based on the mechanism of the Stewart platform is presented. The force sensor is used to measure forces/torques and to provide passive compliance during part assembly. It is mainly composed of two platforms, the payload platform and the end-effector platform, coupled by six spring-loaded pistons whose length variations are measured by six linear voltage differential transformers mounted along the pistons. The forces and torques applied to the end-effector platform are computed by using the inverse and forward kinematic transformations of the Stewart platform, the known spring constants, and the piston length variations. Results of experiments conducted to evaluate the sensing capability of the force sensor used during the mating and demating of space-rated connectors are reported. >