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Bandwidth reconfigurable microstrip rectangular patch antenna with operating frequency (ƒc), 5.8 GHz has been presented in this paper. Network morphing method has been used to achieve reconfigurability. The bandwidth (BW) of the antenna varies from 107 MHz to 153 MHz i.e. a bandwidth variation of 46 MHz at almost constant frequency is observed. The VSWR achieved in this structure is 1.19. All this...
A novel partially reflective surface (PRS) antenna is proposed, which can electronically alter its polarization between linear polarization, left-hand circular polarization (CP), and right-hand CP. The antenna consists of a shorted annular patch antenna as the source, a PRS structure to enhance the gain, and a reconfigurable Wilkinson power divider as the feed network. Four p-i-n diodes are inserted...
This paper proposes a wideband polarization reconfigurable antenna design for WLAN applications. It consists of a shorted annular patch (SAP) antenna as the source, a partially reflective surface (PRS) structure to enhance the gain, and a reconfigurable Wilkinson power divider as the feed network. The antenna can electronically alter its polarization between linear polarization (LP), left-hand circular...
Past efforts on reconfiguration focused on modifying the antenna bandwidth by shifting the aperture's frequency response using switches or piezoelectric materials. By contrast, this paper proposes bandwidth reconfiguration by starting with a wideband aperture and limiting its original bandwidth by modifying the array feed. The initial un-configured design provides 9.25∶1 bandwidth for a VSWR 3∶1 or...
Efficiency, reconfigurability, and power consumption are paramount for future communication systems in applications such as cellular handsets, base stations and home networking systems. We present our work in the European PANAMA project which addresses the associated challenges. Our work focuses on the improvement of the efficiency and reconfigurability of base transceiver stations (BTS). Starting...
In order to design wideband pattern reconfigurable antenna, a compact switchable CPW-to-slotline transition feed structure is proposed in this paper. In the slotline feed, one slot of CPW is used as feed line, and the other slot serves as open stub for matching. No other structure is involved for the transition from CPW to slotline. Base on the switchable feed structure, one CPW mode and two slot...
A low-profile antenna based on a Hilbert space filling curve of order n=2 was designed, simulated, fabricated and measured to show the range of reconfigurability options of this type of space-filling curve conformal antenna. PIN diodes were used for reconfigurability and the antenna exhibited two resonant frequency bands. The upper band showed a 16% VSWR <2 bandwidth with a center frequency of...
Three applications in wireless networks where model-free stochastic learning is applicable, are discussed. The learning based optimization problems are formulated and simulation results are presented. Some open issues are also discussed.
In this paper we discuss performance results of a novel real-time closed-loop power amplifier (PA) linearization technique that has originally been proposed by Ahmed and Li. The novel approach performs on-the-fly prediction and measurement of the PA AM/AM and AM/PM non-linearity, stores such non-linear characteristics and calculates their inverse functions in order to pre-distort the base-band amplitude...
We designed and built a novel all-optical re-timing, re-amplifying, and re-shaping (3R) regeneration system based on terahertz optical asymmetric demultiplexers (TOADs) developed in our laboratory. The system is capable of parallel processing multiple wavelengths, a feature which will significantly improve the scalability of current wavelength division multiplexing (WDM) networks. Performance against...
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