The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
In this work a E-shaped microstrip patch antenna is design to resonate at 2.4 Ghz frequency. The FR4 material having dielectric constant of 4.4 is used as a substrate for the design antenna. Further a polarization diversity pair is proposed in which one E-shaped antenna element is horizontally polarized while other is design to be vertically polarized. Polarization diversity pair is oriented in space...
The proposed work is to verify the count of the semen straws which are kept in a compact bunch by using image processing techniques. These straws are kept in liquid nitrogen for the straw content preservation purpose. Due to the liquid nitrogen characteristics and safety requirements for both semen straws as well as workers working in such an environment, a non-harming, rapid process for straw counting...
Multiple access techniques are required to meet the demand for high-speed and large-capacity communications in optical networks, which allow multiple users to share the fiber bandwidth. Optical code-division multiple-access (O-CDMA) is receiving increased attention due to its potential applications for broadband access networks. We analyze a new technique for encoding and decoding of coherent ultra...
Design of simple circularly polarized microstrip antenna(CPMSA) is proposed. Circular polarization has been obtained by truncating the diagonal corners of the MSA. Bandwidth is enhanced by increasing the substrate height. Inserted slots further enhanced the AR BW.Center frequency of CPMSA is 2.438GHz. VSWR bandwidth of 120 MHz & axial ratio bandwidth of 71.64MHz which is approximately 2.5 times...
In optical code division multiple access (OCDMA) system, many users share the same transmission medium by assigning unique pseudo-random optical code (OC) to each user. OCDMA is attractive for next generation broadband access networks due to its features of allowing fully asynchronous transmission with low latency access, soft capacity on demand, protocol transparency, simplified network management...
An efficient two-stage low noise amplifier (LNA) is designed around 3.5 GHz spectrum of WiMAX. The first stage of LNA is designed using pseudomorphic high electron-mobility transistor (pHEMT).The pHEMT GaAs FET is conditionally stable within the desired frequency range of 3.3 GHz to 3.5 GHz. The simulated results were obtained at 3.4 GHz for gain of 24.3 dB, noise figure (NF) 1.13 dB, input return...
A very practical radiator in the HF (3-30 MHz), VHF (30-300 MHz) and UHF (300-3000 MHz) is Yagi-Uda antenna. The radiation characteristics that are usually of interest in the Yagi -Uda antenna are the forward and backward gains, input impedance, bandwidth, front to back ratio, VSWR and magnitude of minor lobes. In this paper the 4-element Yagi-Uda antenna is investigated for the frequency of 435 MHz...
Microstrip Antennas (MSAs) have several advantages, including that they are light weight and small volume and that they can be made conformal to the host surface. In addition, MSAs are manufactured using printed circuit technology, so that mass production can be achieved at a low cost. In comparison to traditional antenna elements, however, the electrical performance of the basic microstrip antenna...
Silicon micro photonics includes photonics and silicon microelectronics components, which is rapidly evolving in various optical systems. It employs at least two different materials with a large differential index of refraction to squeeze the light down to a small size. We have shown that by ultra-dense coupling of photonic crystal (PhC) nanocavity lasers, the differential quantum efficiencies can...
Microstrip Antennas (MSAs) consist of a metallic radiating patch on one side of thin dielectric substrate and other side is ground plane. Most important advantages of MSAs are low profile, light weight and compatibility with integrated circuit technology. MSAs are used in mobile communication, satellite communication, radar, direct broadcasting, global positioning systems and remote sensing. The major...
The major limitations of microstrip antennas (MSAs) are their narrow impedance bandwidth, small gain and low power handling capability. A half U-slot MSA with shorting wall has been designed and experimentally verified. Its center frequency is observed at 2.66 GHz. The bandwidth is 688 MHz and percentage bandwidth is 25.6% has been obtained while radiation efficiency is above 94% for the operating...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.