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An integrated 23-Cm and Ultra Wide Band (UWB) Antenna is proposed, which has dual band notched characteristics. It is designed for avoiding the interference of frequencies 4.7 GHz and 6.95GHz. Antenna impedance bandwidths are 100MHz (1.2GHz-1.3GHz) and 8.7GHz (3.2GHz–11.9 GHz) that cover the 23-Cm band and entire UWB band. The VSWR in the band notched frequencies are 14 and 5.9 respectively. Measured...
A square-ring microstrip antenna for CP Operation is proposed. Theoretical modal for an antenna is developed using modal cavity model and circuit theory concept. The proposed antenna is also simulated with MoM-based simulator. Theoretical and simulated results show good agreement with earlier reported experimental results. Antenna has a reduced antenna size and centre frequency as compared to the...
A new technique for designing the active microstrip antenna for circular polarization is presented. The circular polarization is achieved by four slits and a pair of truncated corner and the operating frequency is electronically controlled by the bias voltage of varactor diodes. Theoretical modal for an antenna is developed using modal expansion cavity model and circuit theory concept. The results...
Under the Universal Mobile Telecommunication system (UMTS) environment the third generation (3G) system is used to integrate a wide variety of communication services such as high speed data, video & multimedia traffic. But one of the biggest draw back of wireless environment is the limited bandwidth. However, the users sharing this limited bandwidth have been increased considerably by using Space...
In recently proposed multiple access techniques such as IDMA and OFDM-IDMA, the user separation is done by user specific interleavers in contrast to conventional CDMA scheme where user separation is assured with user-specific signature sequences. The user specific interleavers must demonstrate minimum probability of collision amongst each other in addition to other merits including minimal consumption...
The Golden Code is the best known Space Time Block Code (STBC) so far. This code is an optimal code as it satisfies the properties of full rank, full rate and non-vanishing determinants and achieves diversity multiplexing tradeoff. In this paper we have applied Orthogonal Frequency Division Multiplexing (OFDM) over frequency selective channels and compared the performance of Golden STBC with and without...
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