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This paper describes the design and analysis of a compact and efficient ultrawideband unidirectional printed antenna array for indoor applications.A12.2×6.3×1 cm antenna array is capable of covering an ultra-wide frequency band starting from LTE up to Wi-MAX with an average gain approaching 5 dBi over the entire bandwidth. In comparison with the already existing antenna systems in the wireless market...
In this paper, characterization and dosimetry for two Transverse Electromagnetic (TEM) cells by measurements and simulations at the frequency of 1800 MHz are presented. The characterization consists of assessing the S-parameter and the dosimetry consists of getting the Specific Absorption Rate (SAR) values for two TEM cells with 20 cm and 40 cm length. Two Petri dishes put inside the TEM cells and...
This research is concerned with controlling the radiation pattern of a sectional cylindrical slotted waveguide antenna (SCSWA) in both horizontal and vertical planes to make the antenna more directive. In order to cover an area several SCSWAs are used, so the beam should be narrow in the horizontal plane to avoid interference. To control the beam in the vertical plane, the number, the width, and the...
In this paper, the design of compressed retrodirective reflectors via transformation optics is addressed. The proposed method enables a compressed reflector to perform as a classical retrodirective corner reflector while having a much lower profile. Using a simple linear coordinate transformation, the lower profile can be achieved with a TO domain in the reflector consisting of anisotropic homogeneous...
This paper describes the design and analysis of a multi-resonant compact patch antenna with fractal slots on the basis of Smith Chart geometry for indoor communication systems. A 60mm × 60mm × 1mm single patch antenna with periodic fractals in the form of combined r and x circles is capable of resonating at some desired sub-bands starting from LTE to WI-MAX with good enough directional characteristics...
This paper describes the design and analysis of a compact and efficient ultra-wideband unidirectional printed Array antenna for indoor applications. A 12cm∗12cm∗1cm array antenna is capable of covering an ultra-wide frequency band starting from LTE up to WI-MAX with an average gain exceeding 5dBi over the entire bandwidth. In comparison with the already existing antenna systems in the wireless market...
Conventional slotted waveguide antennas are well known and prominently used for many military and even marketable applications. This is due to their different advantageous electrical and mechanical characteristics. It is also well known that this type of antennas is a typical array of slots with which the width of the main beam can be controlled in only one plane by using a different number of elements...
In this paper, electromagnetic cellular propagation modeling with the presence of a human head is presented, taking into account the nature of the human hair existing in the world. Numerical results obtained by the “Complete Technology” approach — offering Finite Integration Technique, Finite Element Method, Method of Moments, MLFMM, Transmission-line matrix and System Assembly and Modeling — are...
Antennas are becoming crucial in an increasingly growing number of vital applications, particularly with the emergence of the 3G and 4G generations of communications. Point-to-multipoint configuration is a major interest nowadays; therefore antennas are designed for this purpose where efficiency, size, and cost play a decisive role. The common practice is to refer to the already existing antennas...
Antennas, nowadays, are used in many systems especially in wireless internet communications and military Radar applications where high power handling capability, high gain along with reliable mechanical characteristics is needed. However, these parameters are very hard to simultaneously optimize, there is always a trade-off in between. In this paper, a Cylindrical Omnidirectional Slotted Waveguide...
The emerging risks of electromagnetic fields have lead researchers to study thoroughly their biological effects on human beings. One of the main systems that concern the public is GSM systems and specifically in urban areas. Typically, GSM antennas in micro cells are placed throughout these areas to cover different sites in each city. Since, nowadays, the demands on such systems are increasing greatly;...
Circularly polarized dish antennas are of great importance since they have better immunity to external types of noise compared to linearly polarized ones. Dish parabolic antennas with end-fire helical feeds provide circular polarization, high directivity and relatively low level of side lobs, however, the conducting ground plane of the helical feed results in a blockage of the reflected rays from...
Corner reflector antennas are widely used in various applications where high directivity is required for point-to-point communication systems. Such antennas, in addition to their high directivity, are very practical due to their simple design which makes them competitive in the market from both financial and electrical aspects. In spite of this fact, reflector antennas suffer from sidelobe radiation...
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