Knowledge Centre
Find a document written by the best international scientists in our secure database.
24776 documents found.
A CPW-fed tapered slot antenna with improved time and frequency domain characteristics
In this paper, a miniaturized CPW-fed tapered slot antenna (TSA) with a modified CPW to slot-line transition structure was introduced. An air-bridge and tapered slot edge (TSE) structure was also employed to broaden the transition bandwidth. Through these applied modifications, negative features of the original TSA (limitation of transition) and antipodal Vivaldi antenna (bad cross-polarization) a
Enhancement of the gain and bandwidth of the microstrip patch antenna with modified ground plane
In this work, microstrip antenna with W- and V-shaped radiating patches have been proposed. Here square- and circular-shaped modified ground planes have been designed by poly tetra fluoro ethylene (PTFE) substrate with dielectric constant 2.4. Broadband with high gain is obtained by optimum selection of radiating patch with modified ground plane. The ground planes are modified by loading a U-shape
Performance parameters prediction of slotted microstrip antennas with modified ground plane using support vector machine
Artificial neural networks (ANNs) have acquired enormous importance in computing of the performance parameters of microstrip antennas due to their generalized and adaptive features. However, recently the concept of support vector machines (SVMs) has become very much popular in performance parameters computation due to several attractive features over ANNs. Specifically, SVMs outreach ANNs noticeab
A miniature tri-band RFID reader antenna with high gain for portable devices
This paper presents a miniature monopole reader antenna for tri-band radio frequency identification (RFID) portable devices. The proposed antenna operates at the main RFID frequencies and can alleviate and compensate for the shortcomings of a single-band antenna. An additional rectangular stub couples with the bent monopole antenna, allowing the latter to resonate at the RFID bands at 902?928 MHz,
EuMC: Abstract Book
1012 October 2017 Nuremberg, Germany Book of Abstracts Typeset by: Causal Productions Pty Ltd www.causalproductions.com info@causalproductions.com Session Index EuMC01: Multiport Planar Coupling Structures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . EuMC02: Tuneable Passive and Active Filters . . . . . .
Editorial
MRF volume 9 issue 6 Cover and Back matter
MRF volume 9 issue 6 Cover and Front matter
Prediction of odd-mode instabilities under output mismatch effects
A methodology is presented to predict odd-mode instability in power amplifiers under output mismatch effects, as in the case of amplifiers connected to an antenna. This kind of instability is often observed in multi-device configurations, due to their symmetry properties. Unlike the single-ended situation, there is a cancellation of odd multiples of the oscillation frequency at the circuit output,
Bitstream radar waveforms for generic single-chip radar
Bitstreams, square wave digital signals, enable flexible radar implementations in modern digital technology. By using bitstreams in place of analog sinusoidal waveforms, we can realize continuous-wave (CW), stepped-frequency CW, frequency-modulated CW, or even pseudo random noise-sequence and pulsed radars, all with a single bit of amplitude resolution. The building blocks are a programable wavefo