Knowledge Centre
Find a document written by the best international scientists in our secure database.
24776 documents found.
EuRAD: Characteristics of the Radar Signature of Multi-Rotor UAVs
Proceedings of the 13th European Radar Conference Characteristics of the Radar Signature of Multi-Rotor UAVs Stephen Harman Radar and Electronic Warfare Dept. QinetiQ Malvern, UK SAHarman@QinetiQ.com Abstract--This paper investigates the theoretical Radar Cross Section of multi-rotor Unmanned Air Vehicles (UAVs), their time response and Doppler frequency signature. Anechoic chamber measurements
EuRAD: Frequency Diverse Array Radar Using Symmetrical Frequency Offsets
Proceedings of the 13th European Radar Conference Frequency Diverse Array Radar Using Symmetrical Frequency Offsets Wen-Qin Wang School of Communication and Information Engineering University of Electronic Science and Technology of China Chengdu, China, 611731 Email: wqwang@uestc.edu.cn Telephone: (86) 28-61831338 Abstract--Frequency diverse array (FDA) uses a small frequency offset across the ar
EuRAD: Airborne Radar Network Coverage for Maritime Surveillance
Proceedings of the 13th European Radar Conference Airborne Radar Network Coverage for Maritime Surveillance Hashir Sherwani Electronic and Electrical Engineering University College London United Kingdom, London WC1E 6BT Email: uceehhk@ucl.ac.uk H. D. Griffiths Electronic and Electrical Engineering University College London United Kingdom, London WC1E 6BT Email: h.griffiths@ucl.ac.uk Abstract--T
Palm tree structured wide band monopole antenna
This paper presents design, fabrication, and testing of a palm tree structured monopole antenna for wideband applications. The proposed antenna has a wide impedance bandwidth (?10 dB bandwidth) from 4 to 10.4 GHz. Palm tree antenna of compact size 23 mm × 20 mm is designed and fabricated on an FR4 substrate of thickness 1.6 mm. To validate the design, a mathematical relationship between the parame
A compact ultra wideband antenna with triple band-notch characteristics
A novel design of a compact ultra wideband antenna with triple band-notched characteristics is proposed. Much wider impedance bandwidth (from 2.63 to 13.02 GHz) is obtained by using a star like-shaped radiator and a defected rectangular ground plane and band-notched functions are obtained by attaching L- and I-shaped structure on the ground and a capacitive-loaded loop (CLL) resonator on the patch
Design and implementation of a voltage-controlled oscillator for MICS-based sensor network system
Wireless network has been emerged as one of the most promising technologies for sensor-integrated applications so far. The ever-increasing demand in long-term chronic monitoring of vital or essential signals is driving a technology revolution in dealing with critical issues of clinical, healthcare, fitness, and wellness, creating multidisciplinary collaborations to benefit mankind. The voltage-con
EuRAD: Early History of Bistatic Radar
Proceedings of the 13th European Radar Conference Early History of Bistatic Radar Hugh Griffiths University College London h.griffiths@ucl.ac.uk Abstract-- In studying the history of radar, it is evident that several of the earliest experiments were bistatic. It is interesting therefore to examine some of these experiments in the light of our current knowledge and experience. The paper describes
Gain properties of an axially slotted cylinder with two coating layers
The gain properties of an axially slotted cylinder coated with two lossless layers and embedded in a certain lossless background medium have been investigated analytically. The effects of different types of coating layers, i.e. dielectric, magnetic, and Single Negative materials upon the gain characteristics of an axial slot have been discussed. It is observed that if inner layer is either of diel
A multi-mode resonator-based UWB bandpass filter with wide stopband
In this paper, a novel multi-mode resonator is presented, which is formed by cascading several open-circuited transmission line sections with a coupled-line section. Owing to its symmetry, even- and odd-mode analysis methods are applied to analyze its resonance characteristic. Based on this resonator, a microstrip ultra-wide bandwidth (UWB) bandpass filter is designed, fabricated, and measured. Th
Dual-band 3-way power divider and combiner based on CRLH-TLs
In this paper, by using composite right and left handed transmission lines and non-radiating CRLH-TLs, a dual-band 3-way series power divider (SPD) is presented. The proposed dual-band divider is designed and fabricated on an inexpensive FR4 substrate of thickness h = 0.79 mm and a relative dielectric constant of ? = 4.4 to work at 0.915 and 2.440 GHz. Also, in order to improve the isolation chara