This article describes the design of a planar antenna, which consists of available small-scale antenna elements and can be used in receivers with adaptive noise reduction algorithms, in particular, the receiving antenna for capsule endoscopic system “Landish”. The entire planar antenna simulation results are described, material for common dielectric substrate is chosen. The differences between ...

We investigate the performance and coexistence techniques for worldwide interoperability for microwave access (WiMAX) delivered from high altitude platforms (HAPs) and terrestrial systems in shared 3.5 GHz frequency bands. The paper shows that it is possible to provide WiMAX services from individual HAP systems. The coexistence performance is evaluated by appropriate choice of parameters, which...

This paper compares the characteristics in the time-domain of Ultra-wide Bandwidth (UWB) monopole antenna and wide slot antenna. Whether the UWB antenna is suitable for the signal transmitting is not only measured by antenna’s width but also by the characteristics of the time domain. These two antennas are proved to be fit for sending and receiving signals in frequency domain. In this paper, th...

1. Abstract: In mobile communications in urban area, it is a significant problem that blind spots of in the narrow street are caused by high buildings. In our previous works, a reflectarray antenna was developed to solve the problem [1]. However, the gain of reflectarray becomes very low when a very broad scattering angle is required. In this research, a new dual-antenna system is proposed, inc...

Microstrip patch antennas are strong candidates for use in many wireless communication applications. This paper proposes the use of a patch antenna with U-shaped slot to achieve wideband application with very low return loss. The objective of this paper is to design, construct and fabricate microstrip antennas suitable for Wi-Max application that centred at frequency 5.25GHz. The antenna must o...

of Dissertation Presented to the Graduate School of the University of Florida in Partial Fulfillment of the Requirements for the Degree of Doctor of Philosophy COLLABORATIVE DECODING AND ITS PERFORMANCE ANALYSIS By Xin Li May 2006 Chair: Tan F. Wong Major Department: Electrical and Computer Engineering Antenna array processing is a common technique that utilizes spatial diversity to enhance the...

This paper compares measurement with prediction of ITU-R Recommendation P.1546. This recommendation mainly depends on propagation curves which are based on the measurement result. The basic field strength is derived from the curve corresponding to transmitting antenna height, frequency and required distance and then correction factor is added to this. There are two important correction values i...

This paper presents a two-port antenna including a receiving port and a transmitting one in the same volume. These two antennas are physically integrated and electrically isolated. The receiving antenna is a linearly polarized narrowband slot for energy harvesting, whereas the transmitting one is a circularlypolarized ultrawideband (UWB) quasi-spiral for signal radiation. The measurement result...

We demonstrate millimeter-scale optical waveguide grating antennas with unidirectional emission for integrated optical phased arrays. Unidirectional emission eliminates the fundamental problem of blind spots in the element factor of a phased array caused by reflections of antenna radiation within the substrate. Over 90% directionality is demonstrated using a design consisting of two silicon nit...

in this paper a new low profile substrate integrated waveguide (siw) probe-fed h-plane horn antenna structure with improved gain is proposed. the proposed antenna consists of two waveguides including a rectangular and a taper one, in which both, first and third modes of the structure are simultaneously excited leading to a uniform field distribution along the radiating aperture of the antenna a...