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A ±45° slant polarization (SP) reconfigurable omnidirectional antenna and a circular polarization (CP) reconfigurable omnidirectional antenna are proposed. 16 PIN diodes are employed for the ±45° SP reconfigurable omnidirectional antenna while 8 PIN diodes are used for the CP reconfigurable omnidirectional antenna. Simulation and experimental results are demonstrated.
This paper proposes a contactless charging platform that allows portable devices being placed and charged. Using wound-wire structure and electro-magnetic induction, contactless power transmission can be achieved between platform and electronic devices. The charging platform adopts a microcontroller to select the appropriate array coils to be activated. The proposed array structure not only retains...
In this paper, a full-wave semi-analytical solution of self and mutual impedances for a coil-based system is proposed. It consists of two concentric circular coils with rectangular cross sections. Traditionally, the calculation of self and mutual impedances of these coils are based on eddy current approximation, where a simple background is assumed to achieve analytical and semi-analytical solutions...
A new microstrip ultra-wideband (UWB) bandpass filter (BPF) with dual sharply rejected notched bands based on E-shaped resonator is proposed in this letter. The basic UWB BPF is designed using interdigital coupled lines and rectangular patch multiple-mode resonator (MMR). Then, the resonance properties of the E-shaped resonator are studied. The analyzed results reveal that the dual-mode resonant property...
According to different data sampling rates which are needed in machinery condition monitoring systems, one dual-mode wireless sensor network structure is proposed in this paper. For the change status of machinery, the faster need high-rate intermittent data acquisition and the lower need low-rate continuous data acquisition, so the wireless sensor network are configured to run in the dual-model to...
In this paper, we report and demonstrate a divide-by −4.5 injection-locked fractional frequency divider using hybrid integrated circuits (PCB process). The presented frequency divider operates at a fundamental frequency of f0 = 2 GHz, and achieves an operation range of 187 MHz under a sweeping input frequency fin around 9 GHz. At a supply current of 5.8 mA, the DC power dissipation is 5.3 mW. The...
A Cognitive Radio Cloud Network (CRCN) model is proposed for wireless communications in TV White Spaces (TVWS). Making use of the flexible and vast computing capacity of the Cloud, a database and a sparse Bayesian learning (SBL) algorithm are developed for cooperative spectrum sensing (CSS) and implemented on Microsoft's Windows Azure Cloud platform. A medium access control (MAC) scheme is also prototyped...
The efficiency of power saving mechanism on wireless communications will influence the time the mobile stations (MSs) can operate. Due to the characteristics of centralized control in WiMAX system, the sleeping period of each subscriber is dominated by a base station (BS) based on their service types, traffic loads, and expected sleeping periods. The power saving mechanism uses an exponential backoff...
This article introduces remote control system for motion of projectile of infrared imaging fuze based on GPS and navigation technology, which is composed of GPS receiver, navigation sensor part, DSP data processor, wireless communication part, motion visual part and other parts. Observer on earth could inspect real time track of projectile compared with theoretical data at a special point of the trajectory...
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