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.
This paper presents a novel miniaturized reconfigurable and switchable feeding network to cover GSM, GPS, 3G, WiFi and global LET standards. The feeding network consists of four conventional Wilkinson power dividers which can be individually reconfigured in length using PIN diodes switches. By controlling the bias voltages of these PIN diodes, the operating frequency of the proposed design can be...
The implementation cost of a phased array antenna is high due to the large number of RF components required in the system. Migrating from the multiport beamforming system to a single-port beamforming system is a promising alternative. In this letter, a novel single-port beamforming algorithm using the pseudo-inverse function is proposed. The signal received at each element is estimated from the combined...
This paper presents the design, fabrication, and experimental results of an enhanced 1:2 Wilkinson Power Divider fabricated on high resistivity Silicon (HRS) and Aluminium wafers. Designed and simulated in Agilent Advanced Design System, this divider exceeds the characteristics of many Wilkinson dividers presented recently in the literature. The enhanced design provides better S-parameters; in addition...
A comparison analysis between two different types of antenna arrays in direction-of-arrival (DOA) estimation is presented. This study was undertaken to point out any difference in the process of DOA estimation between isotropic and directional antenna array. To the best of our knowledge, there is no previous work that analysed the DOA estimation between these two antenna arrays. The approach taken...
This paper presents a novel one-to-eight compact feeding network based on the Wilkinson power divider for a circular antenna array. The network consists of four 1:2 conventional Wilkinson power dividers. The outputs revolve at 45° in order to satisfy the circular geometry on an FR-4 substrate. Moreover, the network size has been optimized and miniaturized targeting compact portable devices. The feeding...
One of the issues in antenna arrays is the mutual coupling that occurs when two radiating elements are placed together. Mutual coupling can significantly degrade the performance of an antenna array. In this paper, we propose a triangular lattice configuration as a technique to reduce the mutual coupling in patch antenna arrays. A 4-element circular patch array with a triangular lattice is simulated...
This paper compares the performances of a number of uniform circular array (UCA) configurations for phased array antennas. A UCA geometry is targeted due to its symmetrical configuration which enables the phased array antenna to scan azimuthally with minimal changes in its beam width and sidelobe levels. Each UCA configuration consists of 19 isotropic elements. Particle Swarm Optimization (PSO) is...
A smart antenna array is designed and fabricated for brain cancer detection. The smart antenna array is composed of three ultra-wideband vivaldi antennas. A brain model with 4 layers is created and simulated with the CST Microwave Studio. A radius of 5mm tumour model is placed into the white matter close to the skull. A short pulse is transmitted into the brain and the reflected signals are detected...
This work proposes a new direction-of-arrival (DOA) estimation algorithm for directional antenna arrays. Most of the existing DOA algorithms are difficult to work with directional antenna arrays due to the characters of directional elements and thus proper modification is required. The proposed algorithm is based on Capon algorithm through the introduction of a new optimisation problem, which aims...
The Fibonacci Switched-Capacitor (SC) converter demonstrates the highest performance by using minimum number of capacitors. However, as the Fibonacci SC requires a wide range of voltage rating of the devices, its implementation is difficult. This paper presents two gate driving techniques for designing and implementing two-phase Fibonacci SC converter for both low and high step-up conversion ratios...
The development of charge pumps has been motivated by the power supply requirements of portable electronic devices. Charge pumps are inductorless DC-DC converters that are small size and high integration. The quality of the charge pump greatly depends on the effectiveness of switches to turn on and off at the designated clock phases. However, to date, no analysis has been carried out on the overall...
The correlation process in direct sequence spread spectrum (DSSS) communication systems is key in having successful signal reception. The implementation of real-time correlation in digital signal processors is one of key challenge in the realization of positioning systems today; as a result, most realizations are either application specific integrated circuits (ASIC) or Field Programmable Gate Array...
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.