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Agriculture sector is one of the essential sectors to any nation. This sector is a challenging domain worldwide due to multiple biotic and abiotic stresses. The search for finding new agricultural technologies to enhance the crop productivity is a prime goal. Exposure of crop seeds or plants from short to longer term radio frequency and electromagnetic fields may have positive or negative effects...
This paper presents a design and implementation of a Power Amplifier for GSM Transmitters using a high efficiency class-F type. A typical class-F circuit has been designed, simulated and implemented using GaAs pHEMT transistor at a frequency of 900MHz. The proposed design achieves 95.5% of theoretical Power Added Efficiency and 28.9dBm output power. To validate the designed circuit, experimental work...
This paper investigates the highly efficient design of switching mode class E power amplifier for frequencies of 900 MHz and 1800 MHz to increase the efficiency of cellular phones batteries thus by reducing the power consumed in the power amplifier. This is the continuation of an ongoing work by the authors. Here, a typical class E circuit design steps are shown for 1800 MHz in addition to the circuit...
The cellular mobile communication industry has recently been one of the fastest growing industries. This paper presents efficient techniques in the design of switching mode class E power amplifiers by reducing switching losses. A typical class E circuit has been design-optimized for 900 and 1800 MHz. Matching networks are used to reduce power consumption. The simulated results were analyzed in terms...
Path loss occurs when the received signal becomes weaker and weaker due to increasing distance between mobile station (MS) and base station (BS), even if there are no obstacles between the transmitting (Tx) and receiving (Rx) antenna. The path loss between a pair of antenna is the ratio of transmitted power to the received power, usually expressed in decibels. It includes all of the possible elements...
A 3D theoretical simulation and analysis of DC stray-current corrosion (SCC) is introduced. The use of boundary element analysis system (BEASY) has allowed cathodic protection (CP) interference to be assessed in terms of the normal current density, which is directly proportional to the corrosion rate. Different real structures consisting of pipelines and/or well casings are simulated to investigate...
This paper examines the applicability of Okumura-Hata model in Oman in GSM frequency band. The study was carried out for open area only, since measurements provided from OmanMobile were about the open areas. The mean square error (MSE) was calculated between measured path loss values and those predicated on basis of Okumura-Hata model for an open area [1 ]. The MSE is up to 6dB, which is an acceptable...
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