# IET Microwaves, Antennas & Propagation

## Filter Results

Displaying Results 1 - 17 of 17
• ### Multi-level dual-grid finite-difference time-domain approach for the analysis of body implanted antennas

Publication Year: 2010, Page(s):659 - 666
Cited by:  Papers (3)
| | PDF (563 KB)

This study presents an extension of the recently published dual-grid finite-difference time-domain (FDTD) method, which aims at simulating efficiently body area network problems. It consists in splitting the overall simulation into several classical FDTD simulations sequentially executed with an appropriate mesh. It is proposed as an accurate and fast way of modelling integrated antennas and espec... View full abstract»

• ### Metamaterial dual polarised resistive hilbert curve array radar absorber

Publication Year: 2010, Page(s):667 - 673
Cited by:  Papers (6)
| | PDF (539 KB)

A novel thin metamaterial wideband radar absorber, formed by two layers of resistive Hilbert curve arrays, is analysed numerically, revealing a reduction in monostatic radar cross section (RCS) of more than 10 dB from 8 to 18.8 GHz (81 fractional bandwidth) for Ex and 9.1-20.7-GHz (78- fractional bandwidth) for Ey polarisations, respectively. These bandwidths ar... View full abstract»

• ### Investigations on propagation and the band broadening effect of ridged rectangular waveguide integrated in a multilayer dielectric substrate

Publication Year: 2010, Page(s):674 - 684
Cited by:  Papers (8)
| | PDF (293 KB)

To improve the bandwidth of the substrate-integrated waveguide (SIW), a ridged substrate-integrated waveguide (RSIW) with a centre ridge of cylindrical posts is proposed. A 37% bandwidth enhancement is achieved in this study. Wider bandwidths are still possible. Theoretical design formulas are derived. In the derivation, the TE modes are made equivalent to those of a transmission line cavity, acro... View full abstract»

• ### Analytical prediction of spectral regrowth and correlated and uncorrelated distortion in multicarrier wireless transmitters exhibiting memory effects

Publication Year: 2010, Page(s):685 - 696
Cited by:  Papers (1)
| | PDF (839 KB)

Measurement of non-linearity effects in wireless transmitters had been always difficult under complex digitally modulated signals. On the other hand, blind time domain simulation of these effects is generally time consuming and insufficient. In this study, the authors present new frequency domain closed-form formulas for predicting the spectral regrowth in wireless communication systems/subsystems... View full abstract»

• ### Impedance matrix of a folded dipole pair under eleven configuration

Publication Year: 2010, Page(s):697 - 703
Cited by:  Papers (15)
| | PDF (616 KB)

A new decade wideband antenna, the Eleven antenna, has been developed during the last years. The basic configuration of Eleven antenna is two parallel dipoles separated by half wavelength above the ground plane, which is referred to as the eleven configuration. In order to cascade the dipoles in log-periodic array for obtaining wideband performance, folded dipoles are often used. The input impedan... View full abstract»

• ### Kurokawa's noise spectra of microwave oscillators in terms of closed-loop gain

Publication Year: 2010, Page(s):704 - 711
| | PDF (427 KB)

In this study, the authors have derived the amplitude and phase-noise spectra of microwave oscillators based on the Kurokawa's method. The derived formulations are expressed in terms of the closed-loop gain of feedback circuits, which can be easily calculated by a special oscillation test element available in commercial microwave CAD software. To verify the derived formulations, the phase noise of... View full abstract»

• ### Stop-band and band-pass filters in coplanar waveguide technology implemented by means of electrically small metamaterial-inspired open resonators

Publication Year: 2010, Page(s):712 - 716
Cited by:  Papers (1)
| | PDF (383 KB)

In this study, coplanar waveguide (CPW) stop-band filters based on open split ring resonators (OSRRs) are presented for the first time. The filters consist on a cascade of transmission line sections, acting as impedance inverters, alternating with shunt connected OSRRs. An order-3 Butterworth stop-band filter is presented as an illustrative example. The second part of the study deals with the appl... View full abstract»

• ### Metamaterial-based wideband rat-race hybrid coupler using slow wave lines

Publication Year: 2010, Page(s):717 - 721
Cited by:  Papers (5)
| | PDF (298 KB)

Based on derived convenient design equations for slow wave transmission lines and metamaterial line, a very compact and wideband rat-race hybrid coupler is proposed using three -90° slow wave lines and one -90° metamaterial line. The closed-form solutions for circuit parameters based on both phase and phase slope matching conditions are derived. At the design frequency of 2 GHz, the ... View full abstract»

• ### Characterisation of narrowband communication channels on the human body at 2.45 GHz

Publication Year: 2010, Page(s):722 - 732
Cited by:  Papers (24)
| | PDF (740 KB)

A number of propagation measurements of belt-to-head and belt-to-wrist channels have been performed with inverted F-antennas, planar inverted F-antennas (PIFAs), monopole, loop and dipole antennas, and propagation models were derived. It is found that the channel can be separated into short-term and long-term fading components. The short-term fading can generally be modelled with a Rician distribu... View full abstract»

• ### Polarisation and resonant characteristics of gap-loaded microstrip square ring antennas

Publication Year: 2010, Page(s):733 - 742
Cited by:  Papers (4)
| | PDF (1273 KB)

Multi-frequency operation is obtained from the single-layer probe-fed square ring antenna by loading it with a gap or slit. Two additional modes are excited around the dominant TM11 mode of the square ring, equally spaced in the frequency spectrum, and have similar radiation patterns. To excite these additional modes, the loading has to be symmetric on one arm; however, the excitation h... View full abstract»

• ### Multipath simulator for mobile terminal antenna characterisation

Publication Year: 2010, Page(s):743 - 750
Cited by:  Papers (7)
| | PDF (370 KB)

A measurement equipment for terminal antennas is presented. The equipment simulates a 2-D multipath signal environment in a lab, enabling fast measurements of weighted radiation properties. It consists of 16 antenna elements encircling the antenna under test, and a 1-to-16 feed network including Doppler generators on the 16 branches. In-the-air combining at the terminal under test gives fast fadin... View full abstract»

• ### Surface wave diffraction by a sloping 'left-handed' region

Publication Year: 2010, Page(s):751 - 759
| | PDF (844 KB)

An exact analytical solution to the problem of surface wave diffraction by a penetrable left-handed medium (LHM) ε = μ = -1 material slope of arbitrary angle (subject to valid physical constraints) is presented. Standard analysis involving discontinuous angular eigenfunctions resulted in a discrete spectrum leading to a series solution that exhibits the expected negative refraction... View full abstract»

• ### Improving the macro-basis function using insertion method and iterative refinement process for planar structure with one-dimensional wave propagation

Publication Year: 2010, Page(s):760 - 770
| | PDF (1129 KB)

This study introduces a new method to construct the macro-basis functions that improves the accuracy of a solution for a dense planar structure with wave guided in one direction. The basic step in the approach is to divide a structure into several sub-domains. An incident wave and an artificial reflected wave are then created through a smaller problem that is made up of a few sub-domains. The rema... View full abstract»

• ### Modelling of resistive sensor for high-power microwave pulse measurement of te01 wave in circular waveguide

Publication Year: 2010, Page(s):771 - 777
| | PDF (441 KB)

The interaction of a semiconductor plate with TE01 (H01) wave in a circular waveguide has been investigated. A plate with contacts on its top and bottom serves as a sensing element (SE) for a resistive sensor (RS) based on the electron heating effect and devoted to high-power microwave pulse measurement. A three-dimensional finite-difference time-domain method was applied to ... View full abstract»

• ### Physical modelling of multiple-input multiple-output antennas and channels by means of the spherical vector wave expansion

Publication Year: 2010, Page(s):778 - 791
Cited by:  Papers (7)
| | PDF (757 KB)

The authors propose a new physically motivated model that allows the study of the interaction between the antennas and the propagation channel for multiple-input multiple-output (MIMO) systems. The key tools employed in the model are the expansion coefficients of the electromagnetic field in spherical vector waves and the scattering matrix representation of the properties of the antenna. The autho... View full abstract»

• ### Pure left-handed transmission line

Publication Year: 2010, Page(s):792 - 798
Cited by:  Papers (1)
| | PDF (580 KB)

The pure left-handed transmission line (PLH TL) for a broad left-handed (LH) band is presented. It consists of a defected ground structure (DGS) and a wire bonded inter-digital capacitor (WBIDC). The bridged connection of vias to ground makes the components of inductance and capacitance effectively negative. These negative components exclude a parasitic right-handed branch so that the transmission... View full abstract»

• ### Seed function combination selection for chained function filters

Publication Year: 2010, Page(s):799 - 807
Cited by:  Papers (1)
| | PDF (365 KB)

An algorithm is presented for seed function combination selection for chained function filters on the basis of pre-defined manufacturing limitations. To this end, and for the first time, combinatorial analysis methods have been applied to computer-aided filter design routines. A fundamental Monte-Carlo margin has been discovered that represents an upper-bound on the worst-case pass-band return-los... View full abstract»

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

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