# IET Microwaves, Antennas & Propagation

## Filter Results

Displaying Results 1 - 15 of 15
• ### Design and technology of micro-machined coplanar grounded wave-guides

Publication Year: 2012, Page(s):497 - 504
| | PDF (824 KB)

Coplanar wave-guide grounded lines (CPWGs) with micro-machined via-holes have been designed, realised on high-resistivity silicon wafers, and tested up to 40 GHz. Several configurations, designed by changing the dimensions of the micro-machined via-holes used for the ground connection, as well as their number and separation, have been compared to get the best electrical matching conditions. Wide-b... View full abstract»

• ### Frequency and polarisation reconfigurability from an open-loop square ring antenna

Publication Year: 2012, Page(s):505 - 509
Cited by:  Papers (6)
| | PDF (698 KB)

In this study, two types of reconfigurable microstrip square ring antennas are proposed. The basic structure of the proposed antennas is an open-loop-type square ring resonator. To increase antenna gain, a square ring slot with narrow width is embedded into the ground plane. The proposed antenna is fed by a T-shaped microstrip through a gap coupling. Depending on the location of the gap in the squ... View full abstract»

• ### Technique for minimising the effects of ground plane on planar ultra-wideband monopole antennas

Publication Year: 2012, Page(s):510 - 518
Cited by:  Papers (4)
| | PDF (1787 KB)

A common problem with current planar ultra-wideband (UWB) monopole antennas is that their performance is heavily affected by the size of the ground plane. This is due to the fact that dimensional changes influence the characteristic modes excited on the ground plane, which directly affects the impedance and the radiation behaviour of the antenna. A technique of cutting slots on the ground plane is... View full abstract»

• ### Surface-impedance quasi-transverse electromagnetic approach for the efficient calculation of conductor losses in multilayer single and coupled microstrip lines

Publication Year: 2012, Page(s):519 - 526
| | PDF (552 KB)

In this study the authors present a new surface-impedance model for the accurate computation of the effect of metal losses on the parameters of printed microstrip lines. The novelty of the authors' approach lies in the fast and direct calculation of the tangential magnetic fields above and below the strip conductors, which allows us to develop a very efficient quasi-transverse electromagnetic (TEM... View full abstract»

• ### Efficient version of multilevel compressed block decomposition for finite-element-based analysis of electromagnetic problems

Publication Year: 2012, Page(s):527 - 532
| | PDF (340 KB)

This work investigates the feasibility of utilising the multilevel compressed block decomposition algorithm (MLCBD) to increase the efficiency of solving the matrix equation obtained from the finite-element method in the electromagnetic analysis. The MLCBD takes advantage of the low-rank approximation of each sub-matrix of the inverse matrix by truncating the information relative to the minor sing... View full abstract»

• ### Fully micromachined W-band rectangular waveguide to grounded coplanar waveguide transition

Publication Year: 2012, Page(s):533 - 540
Cited by:  Papers (6)
| | PDF (842 KB)

This study presents a novel grounded coplanar waveguide (CPW) to fundamental rectangular waveguide mode transition for W-band applications. The designed waveguide-to-CPW transition is optimised to achieve low-loss. The maximum insertion loss of the waveguide-to-CPW back-to-back transition is -1.8-dB in a frequency range of 91.2-113.2-GHz, corresponding to a large 22- bandwidth. Since the structure... View full abstract»

• ### Size reduction technique for the marching-on-in-order time-domain integral equation method in analysis of transient electromagnetic scattering

Publication Year: 2012, Page(s):541 - 548
Cited by:  Papers (3)
| | PDF (477 KB)

The aggregative basis functions (ABFs) are introduced to construct a size-reduced system for the marching-on-in-order (MOO) time-domain integral equation (TDIE) method to analyse transient electromagnetic scattering from conducting objects. Based on the previously developed characteristic basis function method (CBFM), a set of orthogonal vectors that expand the original unknown current coefficient... View full abstract»

• ### Investigation of ultra-high-frequency antennas printed with polymer pastes on flexible substrates

Publication Year: 2012, Page(s):549 - 554
Cited by:  Papers (8)
| | PDF (500 KB)

One of the application areas for printed electronics is producing antennas on flexible substrates. Their mechanical and electrical parameters depend on their design and type of applied materials. Antennas in the ultra-high-frequency (UHF) range, printed on various substrates with polymer materials containing fillers such as silver flakes, silver nanopowder, carbon nanotubes and pastes based on con... View full abstract»

• ### Effect of antenna directivity on performance of multiple input multiple output systems in an underground gold mine

Publication Year: 2012, Page(s):555 - 561
Cited by:  Papers (4)
| | PDF (536 KB)

In this study two measurement campaigns are presented, where two types of multiple input multiple output (MIMO) antennas are investigated in an underground mine environment, aiming to identify the optimal antenna technology that allows to improve the performance of MIMO system in terms of root mean square (RMS) delay spread, path loss and capacity. It is found that in such scatter-rich environment... View full abstract»

• ### Micromachined based narrow band Fabry-Perot tunable bandpass filter

Publication Year: 2012, Page(s):562 - 568
| | PDF (999 KB)

A micromachined based narrow band Fabry-Perot tunable bandpass filter is designed, fabricated and measured. The narrow bandpass characteristic is due to the cavity formed in the bandgap structures by the insertion of a transmission line resonator between the two Bragg reflectors. The parametric analyses of the Fabry-Perot electromagnetic bandgap (EBG) filter are investigated by considering (i) the... View full abstract»

• ### Cut-off space of a gyromagnetic planar disk resonator with a triplet of stubs with up and down magnetisation

Publication Year: 2012, Page(s):569 - 576
Cited by:  Patents (1)
| | PDF (504 KB)

A switchable circulator may be realised by internally or externally switching or latching a suitable ferrite resonator at the junction of three transmission lines or waveguides. This study investigates the split frequencies and therefore the quality factor of a geometry consisting of a half-wave-long cylindrical cavity and another which consists of a tri-toroidal structure. The model adopted in th... View full abstract»

• ### High chip reactance matching for ultra-high-frequency radio frequency identification tag antenna design

Publication Year: 2012, Page(s):577 - 582
Cited by:  Papers (2)
| | PDF (900 KB)

This study describes a high impedance-matched dipole antenna, which is composed of an inductive T-loop and a small bent dipole radiator with a slit for ultra-high-frequency (UHF) radio frequency identification (RFID) tag design. Simple adjustments of the T-loop and dipole radiator of the antenna allow for easy control of the antenna resistance and inductive reactance, from which a high chip reacta... View full abstract»

• ### Coplanar-waveguide-fed folded dipole slot antenna for wireless local area network applications and V-band frequency operations

Publication Year: 2012, Page(s):583 - 587
Cited by:  Papers (1)
| | PDF (458 KB)

A scalable coplanar-waveguide-fed folded dipole slot antenna operating at 60 GHz has been designed, fabricated and tested on a 50 m silicon membrane. The inclusion of a dipole within a slot antenna has been used to easily integrate with power transmission applications and to improve the bandwidth performance of traditional 60 GHz micromachined antennas. Results indicate that the antenna operates f... View full abstract»

• ### Centre-fed series array antenna for K-/Ka-band electromagnetic sensors

Publication Year: 2012, Page(s):588 - 593
Cited by:  Papers (3)
| | PDF (588 KB)

This study introduces a novel series array antenna for passive millimeter wave sensor applications, particularly physical securities and vigilance sensors. The antenna is mainly composed of a three-line series array and has a symmetrical structure whereby a Chebyshev polynomial has been used to obtain a low side-lobe characteristic. For a more symmetrical antenna pattern, the authors considered ... View full abstract»

• ### Periodic leaky-wave antennas fed by a modified half-mode substrate integrated waveguide

Publication Year: 2012, Page(s):594 - 601
Cited by:  Papers (11)
| | PDF (925 KB)

This study presents two configurations of periodic leaky-wave antennas fed by a modified half-mode substrate integrated waveguide (HMSIW) where a metallised trough is employed as the waveguide's side wall. The first antenna configuration is constructed from periodically etching a row of transverse slots on the ground plane of the feeding HMSIW, whereas in the second configuration, the row of slots... View full abstract»

## Aims & Scope

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

Full Aims & Scope

## Meet Our Editors

IET Research Journals
iet_map@theiet.org