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# IET Microwaves, Antennas & Propagation

## Filter Results

Displaying Results 1 - 25 of 35
• ### Fast antenna pattern synthesis using the variational method

Publication Year: 2010, Page(s):1689 - 1697
Cited by:  Papers (1)
| | PDF (625 KB)

The radiation pattern is usually a factory set characteristic of telecommunication equipment. By using an antenna array, the radiation pattern can be shaped in order to optimise the covered region. Antenna pattern synthesis consists of determining the phase and the amplitude to apply to each radiating element of the network for obtaining the targeted radiation pattern. A radiation pattern synthesi... View full abstract»

• ### Self-assembly of three-dimensional Au inductors on silicon

Publication Year: 2010, Page(s):1698 - 1703
| | PDF (401 KB)

Integration of inductors into high-frequency silicon circuits currently comes at the expense of a low-quality factor (Q), mainly because of electromagnetic interactions with the underlying substrate. Various fabrication methods for high Q inductors have been proposed, but poor compatibility with standard semiconductor process technology is a common problem. A promising technique invo... View full abstract»

• ### Wideband integrated feeding system for a dual polarisation sinuous antenna

Publication Year: 2010, Page(s):1704 - 1713
Cited by:  Papers (3)
| | PDF (1027 KB)

The objective of this work is to demonstrate the achievability of integrating a feeding system to the radiating part of a wideband dual polarised antenna. To reach this objective, a wideband microstrip-to-coplanar stripline (CPS) balun has been developed. This balun configuration is suitable for integration with planar balanced antennas in a compact form. The performance of this balun is investiga... View full abstract»

• ### Small printed inverted-L monopole antenna for worldwide interoperability for microwave access wideband operation

Publication Year: 2010, Page(s):1714 - 1719
Cited by:  Papers (4)
| | PDF (771 KB)

A small-size printed inverted-L monopole wideband antenna for mobile application is presented. The antenna is simply structured with an L-strip, which occupies a small area of 10×14 mm2 on the top portion of the substrate. A simple matching circuit using lumped elements is used to introduce two resonance frequencies and to further enhance the bandwidth. The proposed antenna achie... View full abstract»

• ### Multiband electromagnetic wave absorber based on reactive impedance ground planes

Publication Year: 2010, Page(s):1720 - 1727
Cited by:  Papers (6)
| | PDF (836 KB)

A novel structure able to perform multi-band absorption is presented. As is well known, the most famous and simplest radar absorbing material is the Salisbury screen. Improved solutions, aimed at a thickness reduction, have been presented in the literature, conceptually based on metamaterials and employing properly designed high-impedance surfaces (HIS) in practice. The absorber presented here com... View full abstract»

• ### Compact E-band planar quasi-Yagi antenna with folded dipole driver

Publication Year: 2010, Page(s):1728 - 1734
Cited by:  Papers (14)
| | PDF (977 KB)

A broadband planar quasi-Yagi antenna using a folded dipole driver is presented. The new antenna element is realised on a low dielectric constant substrate and it is suitable for millimetre-wave applications using low-cost thick-film fabrication. The advantage of the quasi-Yagi antenna with folded dipole driver compared to the standard quasi-Yagi antenna is a reduction in the length of the driver,... View full abstract»

• ### Diversity performance of multiport dielectric resonator antennas

Publication Year: 2010, Page(s):1735 - 1745
Cited by:  Papers (1)
| | PDF (812 KB)

Single-structure dual and triple linearly polarised cylindrical dielectric resonator antennas (CDRAs) with respective excitation sets of two orthogonal modes and three degenerate modes at 120° to each other are investigated for operation as compact multiport antennas. The diversity performance of these multiport CDRAs is evaluated using theoretical expressions of envelope correlation coeffi... View full abstract»

• ### Reconstruction of metal protrusion on flat ground plane

Publication Year: 2010, Page(s):1746 - 1755
Cited by:  Papers (1)
| | PDF (385 KB)

The authors present a gradient-based optimisation algorithm for the reconstruction of the shape of a metal protrusion on a flat ground plane based on the scattering matrix of an array antenna. The sensitivities are based on the continuum form of Maxwell's equations, which offers good flexibility with respect to the choice of field solver. The computational cost for the gradient is independent of t... View full abstract»

• ### Dual-band microstrip antenna array with a combination of mushroom, modified Minkowski and Sierpinski electromagnetic band gap structures

Publication Year: 2010, Page(s):1756 - 1763
Cited by:  Papers (3)
| | PDF (895 KB)

A novel concept involving a single-port dual-band microstrip antenna array (DbMSAA) incorporated with electromagnetic band gap (EBG) structures is reported. Three types of EBG structures are used in the designs, which include the mushroom EBG, a modified Minkowski EBG and Sierpinski EBG structures. These EBG structures operate like a band rejecter, separating the branch of feed lines feeding two d... View full abstract»

• ### Comparison of frequency-selective screen-based linear to circular split-ring polarisation convertors

Publication Year: 2010, Page(s):1764 - 1772
Cited by:  Papers (18)
| | PDF (1094 KB)

This study presents the use of periodic arrays of freestanding slot frequency-selective screens (FSS) as a means for generating circularly polarised signals from an incident linearly polarised signal at normal incidence to the structure. Measured and simulated results for crossed, linear and various ring slot element shapes in single and double-layer polarisation convertor structures are presented... View full abstract»

• ### Thru-less calibration algorithm and measurement system for on-wafer large-signal characterisation of microwave devices

Publication Year: 2010, Page(s):1773 - 1781
Cited by:  Papers (1)  |  Patents (1)
| | PDF (441 KB)

A reflection-based thru-less de-embedding technique for voltage and current waveforms and absolute power flow measurements suitable for on-wafer large-signal characterisation of microwave transistors is proposed. Based on the novel calibration technique developed, which does not require any special golden standard for waveform calibration purposes, a comprehensive and relatively inexpensive powe... View full abstract»

• ### Design and development of a conjugate matched feed for an offset parabolic reflector antenna

Publication Year: 2010, Page(s):1782 - 1788
Cited by:  Papers (4)
| | PDF (733 KB)

The design and development of a tri-mode conjugate matched feed, to suppress the unwanted high cross-polarisation and beam squinting in an offset parabolic reflector antenna, are presented. In a smooth-walled cylindrical waveguide, TE11, TM11 and TE21 modes are combined in proper amplitude and phase to configure a tri-mode conjugate matched feed. The performance of... View full abstract»

• ### Fully integrated 24 GHz differential active sub-harmonic mixer located in CMOS multi-layer Marchand baluns

Publication Year: 2010, Page(s):1789 - 1798
Cited by:  Papers (3)
| | PDF (753 KB)

A fully integrated active sub-harmonic mixer (SHM) located in two Marchand baluns is presented. The proposed circuit was designed at 24 GHz for industrial, scientific and medical (ISM) band applications and fabricated in a 0.13 μm complementary metal-oxide-semiconductor (CMOS) process. The proposed circuit layout is based on allocating the active SHM into square passive baluns to reduce the... View full abstract»

• ### Construction of Green's functions of parallel plates with periodic texture with application to gap waveguides - a plane-wave spectral-domain approach

Publication Year: 2010, Page(s):1799 - 1810
Cited by:  Papers (13)
| | PDF (776 KB)

This study presents Green's functions of parallel-plate structures, where one plate has a smooth conducting surface and the other an artificial surface realised by a one-dimensional or two-dimensional periodic metamaterial-type texture. The purpose of the periodic texture is to provide cut-off of the lowest order parallel-plate modes, thereby forcing electromagnetic energy to follow conducting rid... View full abstract»

• ### Compact ultra-wideband slot antenna fed by coplanar waveguide and microstrip line with triple-band-notched frequency function

Publication Year: 2010, Page(s):1811 - 1817
Cited by:  Papers (10)
| | PDF (901 KB)

A compact ultra-wideband (UWB) printed slot antenna fed by coplanar waveguide (CPW) and microstrip line with multi-band-rejection characteristics is proposed. The small antenna fed by CPW and microstrip line has a volume of 40 × 22 × 0.8 × mm3. By adding an inverted U-shape slot on the tapered radiating patch, the antenna provides band-rejection characteristics. The... View full abstract»

• ### Experimental approach for robust identification of radiofrequency power amplifier behavioural models using polynomial structures

Publication Year: 2010, Page(s):1818 - 1828
Cited by:  Papers (2)
| | PDF (1013 KB)

Here, the robustness of polynomial model identification for radiofrequency power amplifiers (PAs) driven by wideband code division multiple access (WCDMA) signals is investigated. The ill-conditioning problem is highlighted, and the sensitivity of the model identification to disturbance is demonstrated. These issues are mainly related to the correlated character of the WCDMA signal. The identifica... View full abstract»

• ### Near-field to far-field transformation utilising multilevel plane wave representation for planar and quasi-planar measurement contours

Publication Year: 2010, Page(s):1829 - 1837
Cited by:  Papers (2)
| | PDF (566 KB)

A fully probe-corrected near-field far-field transformation employing plane wave expansion and diagonal translation operators has recently been presented, which is able to efficiently carry out transformations for arbitrary measurement point locations. Here, the algorithm is discussed in its multilevel version for the application to planar and quasi-planar measurement contours. The measurement poi... View full abstract»

• ### Near-field radiation characteristics of shaped electrically large apertures in the spatial and angular domains

Publication Year: 2010, Page(s):1838 - 1846
Cited by:  Papers (2)
| | PDF (634 KB)

According to the equivalence principle, the aperture near-field can be expressed as the convolution of the aperture field and the spatial network response function. Therefore the aperture near-field angular spectrum can be expressed as the product of the angular-domain spectrum of the aperture field and the angular-domain spectrum of the spatial network response function. The spatial network funct... View full abstract»

• ### Ring-balun-bandpass filter with harmonic suppression

Publication Year: 2010, Page(s):1847 - 1854
Cited by:  Papers (4)
| | PDF (615 KB)

The Y-matrix of a three-port dual-mode ring resonator for a balun-bandpass filter (BPF) application is derived. Using Y parameters, it is verified that the structure theoretically satisfies the general balun conditions. The admittance slope parameters of the dual-mode ring resonator with one terminated port are derived so that one can design balun-BPFs using the conventional standard... View full abstract»

• ### Perfect plane wave injection for Crank-Nicholson time-domain method

Publication Year: 2010, Page(s):1855 - 1862
| | PDF (403 KB)

The authors derive a 1D multipoint auxiliary source propagator for perfect plane wave injection (PWI) with the Crank-Nicholson time-domain scheme for the first time. By projecting the 2D dispersion equation onto the 1D case, the identical dispersion relation can be realised between the 1D case and the 2D case, which leads to a perfect PWI at any angle forming an integer grid cell ratio. Several nu... View full abstract»

• ### Modelling perfect electric conductor thin-wires that penetrate finite-size dielectric interfaces

Publication Year: 2010, Page(s):1863 - 1869
| | PDF (399 KB)

The modelling of finite-size dielectric (and/or magnetic) material via surface integral equation (SIE) formulations and the method of moments (MoM) in the resonance region is dominated by a triangular-mesh description of the surfaces and supported by Rao-Wilton-Glisson basis functions. Previous formulations allow perfect electric conductor (PEC) thin-wires to be included in the modelling domain wh... View full abstract»

• ### Several theorems for reflection and transmission coefficients of plane wave incidence on planar multilayer metamaterial structures

Publication Year: 2010, Page(s):1870 - 1879
Cited by:  Papers (1)
| | PDF (756 KB)

Consider an arbitrarily polarised plane wave obliquely incident on a planar multilayer structure composed of a combination of natural materials and metamaterials, then the following three new theorems are proved in this paper. Theorem 1: Consider a planar multilayer structure made of a combination of common materials and metamaterials situated between two half spaces composed of lossless media. No... View full abstract»

• ### Internal mirrors for time-reversal optimisation

Publication Year: 2010, Page(s):1880 - 1885
| | PDF (302 KB)

This study reports on the use of time-reversal techniques for the design and optimisation of microwave components. Loss of spatial resolution due to evanescent mode decay in the presence of finite machine precision restricts the scope for optimising large complex devices. This serious problem is addressed by introducing internal time-reversal mirrors for the first time. In conjunction with an expl... View full abstract»

• ### Improved band-notch technique for ultra-wideband antenna

Publication Year: 2010, Page(s):1886 - 1891
Cited by:  Papers (1)
| | PDF (732 KB)

This study describes a compact ultra-wideband (UWB) antenna that exhibits desirable band-notch and gain characteristics. The antenna consists of a rectangular aperture etched on a printed circuit board's ground plane that is excited by a taper shaped patch. The antenna's broadband matching impedance is enhanced by inserting periodic open-end stubs (POES) on the inside edge of the rectangular apert... View full abstract»

• ### Rapid design optimisation of microwave structures through automated tuning space mapping

Publication Year: 2010, Page(s):1892 - 1902
Cited by:  Papers (1)
| | PDF (1171 KB)

Tuning space mapping (TSM) is one of the latest developments in space mapping technology. TSM algorithms offer a remarkably fast design optimisation with satisfactory results obtained after one or two iterations, which amounts to just a few electromagnetic simulations of the optimised microwave structure. The TSM algorithms (as exemplified by Type-1 tuning) could be simply implemented manually. ... View full abstract»

## Aims & Scope

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

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