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A slot antenna for dual-band and dual polarization with good port-to-port isolation is presented. By means of tuning the size of I -shaped mental in the aperture, the proposed antenna operates in two different frequencies for WLAN. Using two simple dual-layered feedings, dual polarized radiation can be achieved. The proposed antenna shows good port isolation less than −20dB for dual linear polarization...
The explosion of the mobile broadband data traffic and the expected needs of ever increasing bandwidth demand present great challenges and opportunities for mobile operators. To mitigate the challenges, mobile operators usually offload mobile data traffic from cellular networks to alternative networks by utilizing IEEE 802.11 wireless fidelity (Wi-Fi) access points and deploying femtocells to leverage...
A compact, low power and global-mismatch-tolerant 0.8-6 GHz fractional-N PLL is designed to cover IEEE 802.11abg, PCS/DCS and cellular bands. Two new techniques are proposed to cancel the in-band quantization noise and fractional spurs. Firstly, a second order binary-weighted digital/analog differentiator (DAD) is utilized to enable the second order mismatch shaping and reduce the quantization noise...
The distributed coordination function (DCF) is the most widely deployed medium access control (MAC) protocol for IEEE 802.11 WLANs. It is a carrier sense multiple access with collision avoidance (CSMA/CA) scheme which employs a binary exponential backoff (BEB) algorithm to reduce the collision probability. In this paper we propose a novel backoff algorithm, collision-aware backoff mechanism (CABM),...
In conclusion, a novel planar PCB multiband antenna with parasitic element is proposed in this paper. Using only two simple radiating elements, the antenna operates with three separate resonant modes, covering six popular communication bands. The antenna area only occupies a small physical space (18 times 37 times 0.6 mm3). This simple planar PCB structure makes the antenna fabrication very cost effective...
In this paper, we present a new design of dual-band planar monopole antenna with a symmetric shorted quarter-wavelength resonator. The antenna consists of two elements in order to achieve dual-band operation: one is a stacked T-shaped monopole for the higher band operation, and the other is the grounded parasitic resonator for lower band operation. The antenna is featured by its compact size, simple...
This paper focuses on planar CPW-fed dual-band rectangular monopole antennas with variation of slot-loaded and taper-fed designs. Monopole antennas of shapes utilizing beveling or tapering technique such as triangle and rectangle could easily broaden the impedance bandwidth to satisfy UWB band requirements. Furthermore, the dual-band operation of both UWB (3.1-10.6 GHz) and existing WLAN 802.11b/g...
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