Jamal M. Rasool; Ihsan M. H. Abbas
Volume 16, Issue 1 , December 2016, , Page 1-10
Abstract
Abstract –In this paper, design of printed monopole antenna based on fractal structures, is introduced as an approach for the use in ultra wideband communication systems, that depends on Koch fractal type.
This antenna fed with a 50Ω microstrip line, designed to be used in frequency range from 3.1 ...
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Abstract –In this paper, design of printed monopole antenna based on fractal structures, is introduced as an approach for the use in ultra wideband communication systems, that depends on Koch fractal type.
This antenna fed with a 50Ω microstrip line, designed to be used in frequency range from 3.1 GHz to 10.6 GHz, also band notched characteristics to reject the WiMAX band is realized by etching a slot of a C-shaped rotated with 90o clockwise. It is printed on FR4 substrate of (4.4) dielectric constant, (1.6) mm thickness, and the fractal geometry is employed in the form of a second iteration Koch curve.
The antenna has a small dimensions of (20mm × 25mm × 1.6mm), with return loss ≤ -10 dB, which offers a bandwidth from 2.84 GHz to 13.28 GHz with nearly Omni directional radiation pattern. The simulation of the design is accomplished through the microwave studio suite of computer simulation technology CST simulator, which is based on finite integration technique.
Saleh M. Al-Qaraawy; Natiq A. Ali
Volume 8, Issue 1 , December 2008, , Page 135-146
Abstract
Abstract:
Impulse radio ultra wideband (IRI-UWB) communication is becoming an important technology for future wire less Personal Area Networks (WPANs). A critical challenge in IR-UWB system design is multi-user interference (MUI). A RAKE receiver is proposed to mitigate the MUI that occurs in some ad-hoc ...
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Abstract:
Impulse radio ultra wideband (IRI-UWB) communication is becoming an important technology for future wire less Personal Area Networks (WPANs). A critical challenge in IR-UWB system design is multi-user interference (MUI). A RAKE receiver is proposed to mitigate the MUI that occurs in some ad-hoc networks like WPAN for IR-UWB system where concurrent transmission are allowed without power control. The proposed RAKE receiver is shown to contribute to a mitigation of multiple access interference (MAI) especially at medium input bit energy –to-noise ratio (Eb/No) values and small number of RAKE taps (fingers). This receiver is based on chip decision after maximum ratio combining and then the final decision based on the number of pulses per symbols. In such scenarios, the conventional RAKE receiver is completely fails to get the expected BER, and does not always perform well. On the other hand, the proposed RAKE receiver has similar complexity as the conventional RAKE. The binary phase shift keying (BFSK) modulation scheme is used in this paper. The performance of the proposed RAKE is evaluated with the Non Line of sight (NLOS)indoor channel model proposed by the IEEE 802.15.3a (COM3) for WPAN with distances (4-10) m.