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This work presents a reconfigurable radiation pattern antenna for WLAN wireless system. The reconfigurable antenna is fed by a coaxial cable, and consists of a star patch, eight hexagon-shaped radiation cells and a circular planar ground. The pattern-reconfigurable antenna proposed achieves eight reconfigurable states by controlling the ON and OFF of eight PIN diodes to change the direction. The state change is performed by PIN diodes connected in the gap between the central star patch and the radiation cells. The antenna has a bandwidth of 360 MHz and can steer the beam in the direction 20°, 340° in azimuth plane. The antenna main beam can be switched to eight directions in elevation plane. The simulated results are also presented and investigated.

This This paper presents a low noise amplifier (LNA) for WLAN applications. The target frequency band 802.11b/g@ 2.4GHz. The amplifier is characterized by input and output reflection coefficients less than −15dB, a forward gain (S21) of 15.112dB, a noise figure of 0.37dB and the third input intercept point of 14.8dB.

This paper presents the analysis of RF-DC conversion circuit topologies designed for wireless energy harvesting at 2.45 Ghz. two rectifications circuits are studied, designed and compared at the conversion power level. The power efficiency of the series and shunt topology are 70% and 74% respectively at the 2.45Ghz frequency. these topologies have been studies and their performances have been evaluated. The simulation results of rectifier circuit are obtained using Advanced Design System-ADS Software.

In this paper, a design and analysis of compact coplanar waveguide-fed ultra wideband antenna is presented. The antenna design exhibits a very wide operating bandwidth of 14.3GHz with a return loss better than 10dB in the frequency range from 3.7GHz to 18GHz. The gain of the proposed antenna is around 4.8dBi. This antenna configuration would be useful for UWB indoor application as it is easy to fabricate and integrate with RF circuitry. All simulations in this work were carried out by using the electromagnetic software.

In this paper, an unbiased mixing antenna for wireless receiver applications is proposed. Thanks to the proper integration of a resistive subharmonic mixer in a five-patch series arrangement, a ?4.47 dB isotropic conversion losses was obtained without the need for batteries. The selected printed structure behaves not only as a 1850 MHz band antenna, but also as a stepped-impedance low-pass filter, rejecting the LO component while allowing the IF signal extraction. Unbiased operation is assured taking advantage of the low positive threshold voltage of Enhancement-mode PHEMT devices. Experimental results show the validity of the proposed solution for low cost and compact wireless reception.