This paper presents the design of a compact microstrip patch antenna with the ability of controlling the number of bands and the operating frequencies independently. Numerical equations are derived using a curve fitting technique to obtain the centre frequency of each band. The antenna comprises a main patch and four sub-patches fed by a 50Ω microstrip line. It is designed to generate up to fiv...

The development of a small electrical antenna plays an important role in the rapidly growing mobile communication market. This paper presents the design of a novel small and wideband planar inverted F-antenna that simultaneously covers the GSM900/GPS/ DCS1800/DCS1900/IMT2000/WLAN/DMB service bands. A very wide impedance-bandwidth characteristic was achieved by optimizing both the distance betwe...

A single-chip, multi-mode receiver for GSM900, DCS1800, PCS1900, and UTRA/FDD WCDMA is introduced in this paper. Hence, the receiver operates at four different RF frequencies with two different baseband bandwidths. The presented chip, which consists of a low noise amplifier, downconversion mixers with on-chip LO I/Q-generation, channel selection filters, and programmable gain amplifiers, uses a...

Two planar monopole antennas with wide impedance bandwidth are designed. A full-wave method of moment (MoM) based on the electric field integral equation (EFIE) is applied to analyze the impedance bandwidth and radiation performance of the monopoles. Meanwhile, the multilevel fast multipole algorithm (MLFMA) is employed to reduce the memory requirements and computational time. Experimental resu...

An extensive research has been carried out to evaluate method for the tracking of mobile equipment using it’s base stations in a GSM network. Enhanced Observed Time Difference (E-OTD) method is one of the promising and fairly developed positioning technologies that has been standardized for GSM systems. This Method has been utilized in this research work to locate the mobile equipment’s positio...

Due to the recent spectrum scarcity challenges, a cognitive radio approach has been proposed to opportunistically reuse the allocated spectrum for efficiency purposes. Different from cognitive radio, which is non-collaborative in general, we propose a spatial spectrum access architecture for reusing the spectrum allocated to standard commercial wireless systems, such as GPRS, in which the secon...