# IET Microwaves, Antennas & Propagation

## Filter Results

Displaying Results 1 - 16 of 16
• ### Design and demonstration of a metamaterial with electronically tunable negative refraction across the C microwave band

Publication Year: 2011, Page(s):631 - 636
| |PDF (505 KB)

The design, numerical simulation and experimental measurement of a novel metamaterial with an electronically tunable negative refractive index region are presented. The proposed unit cell is loaded with commercial varactors operating over the C microwave band. Tunability is achieved by applying a static electric field across the series-connected split-ring resonators. A theoretical description of ... View full abstract»

• ### Analysis of channel capacity for fixed broadband multimedia systems at 40 GHz

Publication Year: 2011, Page(s):637 - 643
Cited by:  Papers (1)
| |PDF (423 KB)

The results of a wideband radio channel sounding campaign performed at 40 GHz band are presented. We have used a sounder based on the correlation of pseudorandom m-sequences, but some novelties have been introduced in the classical scheme of this kind of sounders. Different antenna patterns and polarisations have been combined with three groups of actual environments (indoor, outdoor and indoor-ou... View full abstract»

• ### Broadband dual planar inverted F-antenna for wireless local area networks/worldwide interoperability for microwave access and lower-band ultra wideband wireless applications

Publication Year: 2011, Page(s):644 - 650
Cited by:  Papers (4)
| |PDF (748 KB)

An extension of the planar inverted F-antenna (PIFA) concept is proposed, combining two such antennas (one of them fed parasitically) to extend the usable bandwidth to cover the WiFi wireless local area network, worldwide interoperability for microwave access and lower-band ultra wideband spectra. The broad impedance bandwidth is achieved by combining a driven slotted PIFA, having bandwidth-enhanc... View full abstract»

• ### Analysis of the performance of vegetation barriers to reduce electromagnetic pollution

Publication Year: 2011, Page(s):651 - 663
Cited by:  Papers (4)
| |PDF (510 KB)

Public fear of exposure to electromagnetic fields has led to many countries introducing legislation on the topic. Some have even introduced sensitive areas where field levels should be significantly reduced. This study presents an efficient and ecological method to reduce the exposure to electromagnetic fields for the mobile global system for mobile communication (GSM) and universal mobile telec... View full abstract»

• ### Identification of V-band frequency-selective surface at 11 m standoff distance with a transceiver chipset

Publication Year: 2011, Page(s):664 - 670
Cited by:  Papers (1)
| |PDF (539 KB)

The authors demonstrate the detection of a millimetre wave frequency-selective surface with a null near 60 GHz at large standoff distances (≥10m) such as would be required for covert security labelling and anti-counterfeiting applications. The authors compare the performance of using lenses and offset parabolic reflector to improve the directivity of a commercial, compact, integrated chipse... View full abstract»

• ### Compact characterisation of ultra wideband antenna responses from frequency measurements

Publication Year: 2011, Page(s):671 - 675
Cited by:  Papers (7)
| |PDF (594 KB)

An approach to give a compact representation of UWB antennas using network analyser measurements and based on the extraction of poles/residues by the singularity expansion method is presented. This work focuses on a Matrix Pencil applied to the measured S21 of two identical antenna links. It also suggests applying the MP algorithm twice (once over each causal signal present on both side... View full abstract»

• ### Reduced symmetric self-constructing fuzzy neural network beamforming detectors

Publication Year: 2011, Page(s):676 - 684
Cited by:  Papers (2)
| |PDF (608 KB)

Beamforming technology has been widely used in smart antenna systems that can increase the user's capacity and coverage in modern communication products. In this study, a powerful reduced symmetric self-constructing fuzzy neural network (RS-SCFNN) beamforming detector is proposed for multi-antenna-assisted systems. A novel training algorithm for the RS-SCFNN beamformer is proposed based on cluster... View full abstract»

• ### Full-wave semiconductor devices simulation using meshless and finite-difference time-domain approaches

Publication Year: 2011, Page(s):685 - 691
Cited by:  Papers (1)
| |PDF (350 KB)

A new numerical method for the full-wave physical modelling of semiconductor devices using a combination of the meshless and finite-difference time-domain (FDTD) approaches is described. The model consists of the electron equations for the active part and Maxwell's equations for the electromagnetic effects, which describe the complete behaviour of a high-frequency active device. The unconditionall... View full abstract»

• ### Study of high-frequency electromagnetic transients radiated by electric dipoles in near-field

Publication Year: 2011, Page(s):692 - 698
Cited by:  Papers (8)
| |PDF (509 KB)

The study investigates transient electromagnetic (EM) radiation in the near-field zone of a system of electric dipoles and the usage of the plane wave spectrum (PWS) concept for extraction of a 3-D field from 2-D measurements. Both aspects are important in the modelling and characterisation of radiated emissions in electromagnetic compatibility applications, which are extended here to time domain.... View full abstract»

• ### Compensate for the coupled radiation patterns of compact transmitting antenna arrays

Publication Year: 2011, Page(s):699 - 704
Cited by:  Papers (4)
| |PDF (564 KB)

An effective method is suggested to compensate for the mutual coupling in the coupled array patterns of compact antenna arrays. By using the mutual impedances of the antenna elements, the authors showed that it is possible to design compensation networks that can remove the distortion on array patterns due to the mutual coupling effect. The compensated array patterns enable us to predict the radia... View full abstract»

• ### Very-wideband microstrip antenna for laptop applications

Publication Year: 2011, Page(s):705 - 710
Cited by:  Papers (1)
| |PDF (769 KB)

A very-wideband microstrip antenna is proposed and studied. The antenna has a simple structure comprising a rectangular patch embedded into a notch cut in the finite ground plane edge. The novel structure is bent to reduce antenna height and is divided into two resonators: an open loop and a planar monopole. The former simultaneously excites half- and one-wavelength modes to form a wide bandwidth ... View full abstract»

• ### Multiband-integrated antenna/artificial magnetic conductor

Publication Year: 2011, Page(s):711 - 717
Cited by:  Papers (15)
| |PDF (874 KB)

An artificial magnetic conductor (AMC)-based multiband low-profile antenna for vehicle applications is designed, simulated and measured in this study. The AMC is a simple dual band structure, constructed on a 3.2 mm-thick FR-4 (εr=4.4) board, with the reflection phase and surface wave bandgaps in the 2.0 and 5.8 GHz ranges. A wideband printed circular disc monopole antenna uses t... View full abstract»

• ### 24-GHz in-phase/quadrature direct-down converter with integrated quadrature couplers and baluns in standard 0.18 μm cmos technology

Publication Year: 2011, Page(s):718 - 727
Cited by:  Papers (1)
| |PDF (1082 KB)

A novel monolithic CMOS radio frequency (RF) direct-down converter architecture is described, that comprises three miniature quadrature couplers (QCs), three miniature baluns and two sub-harmonic mixers (SHMs) for direct-down conversion. The SHMs in conjunction with the QCs and baluns are used to eliminate local oscillator (LO) self-mixing. The circuit was fabricated in a standard 0.18 m CMOS proc... View full abstract»

• ### Design of an ultra-wideband monopole antenna with WiMAX, C and wireless local area network

Publication Year: 2011, Page(s):728 - 733
Cited by:  Papers (9)
| |PDF (799 KB)

A compact ultra-wideband (UWB) coplanar waveguide (CPW)-fed printed monopole antenna with single and double band-rejection characteristics are investigated. The antenna has is staircase shaped and is fabricated on a FR4 substrate with an area of 19.5×21×1×mm3. To generate single- and dual-band-notched characteristics, two symmetric and asymmetric quarter wavelength ... View full abstract»

• ### Wide band coplanar waveguide-fed bowtie slot antenna for a large range of ground penetrating radar applications

Publication Year: 2011, Page(s):734 - 739
Cited by:  Papers (8)
| |PDF (702 KB)

For the non-destructive sounding of the sub-surface for a large range of applications, a coplanar waveguide-fed bowtie slot antenna operating in a wide frequency band [0.4;1.5] GHz has been designed. The main originality of our work is the extension of the operating frequency band of the uniplanar bowtie slot antenna to frequencies lower than 800 MHz. The shape and the dimensions of the antenna ha... View full abstract»

• ### Wideband antenna array beam steering with free-space optical true-time delay engine

Publication Year: 2011, Page(s):740 - 746
Cited by:  Papers (2)
| |PDF (630 KB)

A 6-12 GHz Vivaldi wideband antenna array made of four sub-arrays (two elements per sub-array) was built to steer the beam with a White cell optical true-time delay (OTTD) engine. The OTTD engine was simulated to produce delays with a time delay increment of 25 ps. The beam is then steered combining the simulated OTTD delays and the measured mutual coupling of a Vivaldi array to a maximum scan ang... View full abstract»

## Aims & Scope

IET Microwaves, Antennas & Propagation covers all aspects of microwave and antenna engineering and propagation.

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