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This paper presents the radiation performance of a modified elliptical patch microstrip antenna (EPMA) simulated on glass epoxy FR4 substrate material. For modification in patch geometry, two parallel narrow slits in the EPMA geometry parallel to its minor axis are applied. In this way, patch is divided in three patches. The two outer patches are identical in shape and size. The central patch is excited...
This paper presents an overview of random early detection algorithm and differentiated services on ns2. In the present scenario of computer networks the traffic is increasing exponentially due to which packet losses are also increasing at a great rate. An active queue management in routers and gateways can potentially reduce packet loss rates in the Internet. In this paper we have proposed use of...
The radiation properties of a circular patch antenna with u-slot designed on glass epoxy FR-4 substrate are obtained and compared with that of a normal circular patch antenna designed under identical conditions. The modified antenna not only resonates at two different frequencies allotted by IEEE 802.16 working group for lower band (2.495-2.695 GHz) operation for WiMax systems but also presents marked...
Wireless networks suffer from high packet loss-rates and variations in delay and bandwidth. This makes it difficult for conventional transport protocols like TCP to operate efficiently over such networks. We presented multi-path loss tolerant transport protocol (MPLOT) in to counter such lossy and volatile conditions. MPLOT uses multiple paths for data transfer such that at an aggregate level, the...
Airborne links are playing an increasingly important role in defense and military scenarios. This makes it important to investigate the performance of existing transport protocols over such links. Airborne links experience high variation in quality due to mobility, weather and other effects such as blockage. This translates to high loss rate environments for which current protocols are not designed...
In the present paper, a pentagonal microstrip patch antenna is proposed to achieve compact size, broadband and dual frequency operation. It is observed that the proposed antenna is radiating at two different frequencies without much loss in its radiation performance showing broad band performance. Both these resonance frequencies lie in the median band (3.25 to 3.85 GHz) of WiMax systems, a new standard...
This communication presents a comparison in the performance of a normal elliptical microstrip patch antenna with same antenna having loading of sector slits. Required number and dimensions of the slits for bandwidth enhancement are optimized for reliable radiating characteristics. It is found that resonant frequency of the unslotted elliptically patch antenna is about 5.62 GHz, with an operating bandwidth...
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