Wenping Ren

A high isolation MIMO antenna for WLAN and WiMax

A novel high isolation MIMO antenna for WLAN and WiMax operation is proposed. The proposed antenna consists of two back-to-back G-shaped monopoles placed symmetrically with respect to a mushroom-like EBG structure. The measured results show that the proposed MIMO antenna covers WLAN (2350-2550 MHz) and WiMax (3500-3690 MHz) bands with high isolation. The antenna can provide pattern diversity to combat multipath fading.

Dual-band transmitters based on Lowpass and Bandpass delta-sigma modulators

In this paper, a novel comprehensive transmitter architecture has been proposed, which enables the concurrent transmission of two separate frequency bands by carrier aggregation. For different frequencies, the proposed transmitter can simultaneously employ 1-bit Low-pass and Band-pass delta-sigma modulators structures, or employ hybrid structures. Carrier frequencies are equal to oversampling frequencies of modulators. Besides, signals on two carriers are not interfered with each other to ensure transmission dual-band signal. Performance analysis is simulated by using Matlab/Simulink. The simulation results achieve high signal-to-noise radio and show the effectiveness of the proposed architecture.

The MIMO antenna design based on embedded U-shaped metal frame structure

A MIMO antenna with small size and ultrawideband (UWB) is proposed in this paper. The MIMO antenna has four basic antenna units that are placed vertically with each other and four embedded U-shaped metal frames. The improved isolation functions are achieved by utilizing the orthogonal polarization between each unit. It is demonstrated that this antenna can well meet the requirements of isolation and diversity gain from 3.2GHz to 12.6GHz.