A Dual-Polarization Slot Antenna Using a Compact CPW Feeding Structure
A dual-polarization coplanar waveguide (CPW)-fed slot antenna is proposed in this letter. By exploiting the even and odd modes of a CPW structure, two orthogonal polarizations can be excited in a slot aperture by the same feeding CPW, which results in a compact dual-polarization antenna design with very good isolation between the ports. The -10-dB reflection coefficient bandwidths of two polarizations are 670 MHz (27.9%) for one polarization and 850 MHz (35.4%) for the other, and the isolation between the two ports in the WLAN band is better than -32.6 dB. The radiation pattern and efficiency of the proposed antenna are also measured, and radiation pattern data are compared with simulation results.
This paper represents a channel length ratio optimization at a different high logic level voltage for 6-Silicon Nanowire Transistors (SiNWT) SRAM cell. This study is the first to demonstrate an optimized length ratio of nanowires with different Vdd of nano-scale SiNWT based SRAM cell. Noise margins (NM) and inflection voltage (Vinf) of transfer characteristics are used as limiting factors in this optimization. Results indicate that optimization depends on both length ratios of nanowires and logic voltage level (Vdd), and increasing of high logic voltage level of the SiNWT based SRAM cell tends to decrease in the optimized nanowires length ratio with decreasing in current and power.