# IET Microwaves, Antennas & Propagation

## Filter Results

Displaying Results 1 - 25 of 31
• ### Asia-pacific microwave conference [editorial]

Publication Year: 2010, Page(s):1449 - 1450
| PDF (96 KB)
• ### Wideband single-fed proximity coupled circularly polarised annular slot antenna

Publication Year: 2010, Page(s):1451 - 1455
Cited by:  Papers (2)
| | PDF (535 KB)

A wide impedance and axial ratio bandwidths single-fed method for circularly polarised (CP) annular slot antenna is proposed. Impedance and axial ratio bandwidths of approximately 18% have been achieved. The annular slot radiator operating at its fundamental TM11 mode is fed by a simple U-shaped microstrip line structure through proximity coupling at the annular section in the middle of... View full abstract»

• ### Stacked patch antenna with folded patch feed for ultra-wideband application

Publication Year: 2010, Page(s):1456 - 1461
Cited by:  Papers (15)
| | PDF (714 KB)

A new stacked patch antenna with a folded patch feed is presented for ultra-wideband (UWB) application. The bandwidth is obtained by a stacked patch fed with a folded patch feed, and the size reduction is realised through the use of shorting wall. The antenna occupies a compact dimension of 0.340λg×0.340×g×0.227×g (where λ<... View full abstract»

• ### Experimental demonstration of high-resolution ultra-wideband impulse radar based on electrical-optical hybrid pulse generation

Publication Year: 2010, Page(s):1562 - 1468
| | PDF (797 KB)

A high-resolution ultra-wideband (UWB) impulse radar has been developed in order to realise high-resolution object imaging in a ground-penetrating radar (GPR) for landmine detection. The UWB impulse radar is based on an electrical-optical hybrid pulse generation scheme such that a clean, short pulse train with small, short ringing can be generated. The generated UWB impulse train has a pulse durat... View full abstract»

• ### Directional properties of the Bilog antenna as a source of radiated electromagnetic interference measurement uncertainty

Publication Year: 2010, Page(s):1469 - 1474
| | PDF (527 KB)

The influence of the wideband Bilog antenna directivity on uncertainty in radiated electromagnetic interference measurement was analysed. Since the position of the antenna varies with respect to the measured equipment during measurement, the incidental angle of the measured electromagnetic wave also varies. In this manner, errors of antenna directivity occur when using non-dipole antennas, such as... View full abstract»

• ### Two-dimensional interdigital capacitive small antenna resonating at enhanced left-handed modes

Publication Year: 2010, Page(s):1475 - 1480
| | PDF (489 KB)

A two-dimensional interdigital capacitive small antenna to resonate at left-handed (LH) modes is presented in this study. Since a LH resonant mode occurs at a lower frequency, the resonant frequencies of the proposed antenna become lower so that the antenna size can be reduced. The antenna size is significantly decreased thanks to interdigital capacitors which are employed to enhance the LH modes.... View full abstract»

• ### Offset-fed metamaterial antenna for radiation mode generation with efficiency improvement

Publication Year: 2010, Page(s):1481 - 1490
Cited by:  Papers (2)
| | PDF (1082 KB)

In this paper, a new offset-fed metamaterial antenna based on a slot-loaded composite right/left-handed transmission line is proposed. Two antennas, namely a centre-fed metamaterial antenna and an offset-fed one, have been investigated. The offset-fed metamaterial antenna generates additional resonant modes with endfire radiation like a patch antenna, whereas the centre-fed one produces only broad... View full abstract»

• ### Narrow-beam azimuthally omni-directional millimetre-wave antenna using freeformed cylindrical woodpile cavity

Publication Year: 2010, Page(s):1491 - 1499
Cited by:  Papers (6)
| | PDF (826 KB)

A freeformed cylindrical electromagnetic bandgap (EBG) structure and its application for millimetre-wave antennas are presented. The cylindrical EBG structure is fabricated using the extrusion freeforming technique in which the design is downloaded directly to a building platform. The fabricated cylindrical woodpile exhibits bandgap characteristics around 95 GHz and is used for realising a resonan... View full abstract»

• ### Terahertz performance of single-walled carbon nanotubes and arrays

Publication Year: 2010, Page(s):1500 - 1505
Cited by:  Papers (1)
| | PDF (443 KB)

A new carbon nanotube antenna to generate terahertz waves is proposed. The typical properties of terahertz radiation from carbon nanotube dipole antennas have been investigated based on finite integral methods. The terahertz pulses emitted from carbon nanotubes and the terahertz amplitude spectrum have been analysed for carbon nanotubes with a length of 15 m and a radius of 2.712 nm. Other propert... View full abstract»

• ### Improved mutual coupling compensation in compact antenna arrays

Publication Year: 2010, Page(s):1506 - 1516
Cited by:  Papers (6)
| | PDF (583 KB)

A new method for the characterisation of receiving mutual impedances of compact arrays with omni-directional antenna elements is proposed. Based on a large number of incident waves coming from different directions, the new method is able to calculate the receiving mutual impedances of omni-directional antennas based on a system of equations that characterise the received terminal voltages at diffe... View full abstract»

• ### Design and numerical analyses of an indoor 3-5 GHZ UWB-MIMO array

Publication Year: 2010, Page(s):1517 - 1524
Cited by:  Papers (1)
| | PDF (637 KB)

The authors propose an indoor ultra wide band-multi-in multi-out (MIMO) array system constructed using cone antennas mounted on the icosahedral structure. To analyse this structure, we employ our recently developed MIMO array numerical simulation model, viz., wave propagation model combining the multilevel Green's function interpolation method with the ray-tracing technique. The numerical results ... View full abstract»

• ### Millimetre wave multi-polarised microstrip antenna array and application example

Publication Year: 2010, Page(s):1525 - 1530
Cited by:  Papers (1)
| | PDF (557 KB)

A millimetre wave multi-polarised microstrip antenna array based on linearly polarised subarrays and its applications are presented. The theoretical analysis of the far-zone electric field of the antenna array is also presented, which indicates that the polarisation of the far-zone electric field can be configured by adjusting the feed amplitude and phase of each subarray. The measured results sho... View full abstract»

• ### Improvement of radiation efficiency of radio frequency identification tag antenna for metallic objects printed on lossy substrate

Publication Year: 2010, Page(s):1531 - 1537
| | PDF (622 KB)

A new antenna design method is proposed for radio frequency identification tags on metallic surfaces, using a low-cost, high-loss substrate such as FR4. The proposed method significantly reduces the dielectric loss of the substrate and so improves the radiation efficiency of the tag antenna by almost double compared with a conventional planar inverted-F antenna. The equivalent circuit model of the... View full abstract»

• ### Near-field antenna for a radio frequency identification shelf in the uhf band

Publication Year: 2010, Page(s):1538 - 1542
Cited by:  Papers (7)
| | PDF (559 KB)

This study presents the design of a near-field reader and tag antenna in the ultra high frequency (UHF) band that can be used for various radio frequency identification (RFID) shelves. The tag antenna is designed by introducing an S-shaped slot into the circular patch, and the reader antenna is a rectangular slot array fed by microstrip lines. These UHF antennas operating in the near-field are m... View full abstract»

• ### Design of a novel ultra-high frequency radio-frequency identification reader antenna for near-field communications using oppositely directed currents

Publication Year: 2010, Page(s):1543 - 1548
Cited by:  Papers (13)
| | PDF (601 KB)

The authors propose a novel ultra-high frequency (UHF) near-field reader antenna that produces a strong and uniform magnetic near field over a broad region to detect radio-frequency identification (RFID) tags attached to various target objects consistently. The concept of two closely spaced oppositely directed currents (ODCs) is used to obtain a strong magnetic near field, and a symmetrical invert... View full abstract»

• ### Extremely high-frequency beam steerable lens-fed antenna for vehicular sensor applications

Publication Year: 2010, Page(s):1549 - 1558
Cited by:  Papers (5)
| | PDF (807 KB)

A low-profile, high-performance beam steerable antenna, also referred to as electrically steerable array or array, system is proposed for vehicular sensor applications. The antenna aperture is realised by a phased array fed with a tri-focal Rotman lens. Theory of designing the beam-forming network and an improved parametric study are presented, while the narrow-H-plane, broad-E-plane microstrip an... View full abstract»

• ### Spherical vector wave functions solution of electromagnetic scattering by a two-layered uniaxial anisotropic sphere

Publication Year: 2010, Page(s):1559 - 1566
| | PDF (299 KB)

The electromagnetic fields in spherical uniaxial anisotropic objects can be expressed as the sum of spherical vector wave functions of the first and second kind in uniaxial anisotropic media. Applying the tangential boundary conditions of electromagnetic fields at the interface between different uniaxial anisotropic media, the expansion coefficients of electromagnetic fields in a two-layered uniax... View full abstract»

• ### Efficient shooting and bouncing ray tracing using decomposition of wavefronts

Publication Year: 2010, Page(s):1567 - 1574
Cited by:  Papers (5)
| | PDF (659 KB)

A new acceleration technique is presented for shooting and bouncing ray tracing in indoor environments. Tracing just a few rays, the algorithm finds the solid angles around the transmitter that transport electromagnetic power to the receiver. The accuracy is then improved by iteratively increasing the tessellation frequency of the source in the power-transporting solid angles. No rays will be sent... View full abstract»

• ### Oblique incidence on electromagnetic gradient surface

Publication Year: 2010, Page(s):1575 - 1582
Cited by:  Papers (1)
| | PDF (664 KB)

In recent years, a new type of electromagnetic surface, called an electromagnetic gradient surface (EGS), has been developed that is characterised by having electromagnetic gradient. Although it is geometrically flat, it reflects electromagnetic waves towards a steered angle. Unlike existing surfaces with homogeneity in reflection phase, this surface allows a reflection phase to be linear along th... View full abstract»

• ### H- and H2-matrix-based fast integral-equation solvers for large-scale electromagnetic analysis

Publication Year: 2010, Page(s):1583 - 1596
Cited by:  Papers (5)
| | PDF (673 KB)

Integral-equation (IE)-based methods generally lead to dense systems of linear equations. The resulting matrices, although dense, can be thought of as data sparse, that is, they can be specified by few parameters. Based on this observation, two fast IE-based methods were developed for large-scale electromagnetic analysis. One is a centre-point H-matrix-based method of linear complexity for large... View full abstract»

• ### Highly efficient hybrid method for monostatic scattering by objects on a rough surface

Publication Year: 2010, Page(s):1597 - 1604
Cited by:  Papers (2)
| | PDF (547 KB)

A highly efficient hybrid method is proposed for computing scattering by objects above a rough surface. A special treatment is designed and applied to the conventional hybrid method of the Kirchhoff approach (KA) and the method of moments (MoMs) to speed up the computation of the interaction between the objects and the rough surface. To further improve efficiency, the multilevel fast multipole alg... View full abstract»

• ### Unconditionally stable finite-difference time-domain methods with high-order accuracy in two and three dimensions

Publication Year: 2010, Page(s):1605 - 1616
| | PDF (914 KB)

Finite-difference time-domain (FDTD) methods with high-order accuracy in two-dimensional (2D) and three-dimensional (3D) cases are presented, which are based on the split-step scheme and the Crank-Nicolson scheme. In the proposed methods, a symmetric operator and a uniform splitting are adopted simultaneously to split the matrix derived from the classical Maxwell-s equations into six sub-matrices.... View full abstract»

• ### Efficient time-domain analysis of highly dispersive linear and non-linear metamaterial waveguide and antenna structures operated in the impulse-regime

Publication Year: 2010, Page(s):1617 - 1625
Cited by:  Papers (2)
| | PDF (737 KB)

A numerical method is proposed for the analysis of highly dispersive linear and non-linear metamaterial structures. Firstly, pulse propagation along non-linear composite right/left-handed (CRLH) transmission line (TL) is studied. The dispersive CRLH line is loaded with hyper-abrupt diodes to achieve non-linearity. The characteristic impedance and propagation constant of each unit-cell of the CRLH ... View full abstract»

• ### Applications of the multidomain pseudospectral time-domain algorithm for waveguide structures

Publication Year: 2010, Page(s):1626 - 1631
| | PDF (465 KB)

The authors have analysed the complex waveguide structures by the multidomain pseudospectral time-domain (MPSTD) algorithm, and discussed the design of a filtering procedure through improving the stability of the MPSTD method for the corner singularities. These numerical results of the MPSTD method have shown an excellent agreement with those results of the analytical solution and the traditional ... View full abstract»

• ### Analysis and design of wideband widescan planar tapered slot antenna array

Publication Year: 2010, Page(s):1632 - 1638
Cited by:  Papers (7)
| | PDF (811 KB)

Phased arrays have been required to operate over wide bandwidths and wide scan angle to support multifunction operation in both telecommunication and radar. In response to that need, this study firstly analyses the performance of the connected planar tapered slot antenna array and finds that the mutual coupling is essential and has good effect in wideband antenna array design. Then the authors des... View full abstract»

## Aims & Scope

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

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