# IET Microwaves, Antennas & Propagation

## Filter Results

Displaying Results 1 - 17 of 17
• ### V-band 57-65 GHz receiver

Publication Year: 2010, Page(s):1 - 7
Cited by:  Papers (4)
| | PDF (930 KB)

A simple V-band radio IQ receiver architecture based around a six-port monolithic microwave integrated circuit (MMIC) is presented. The receiver assembly is designed to cover the 57-65 GHz broadband wireless communication system frequency allocation. The receiver that has an integral 10 dB microstrip antenna consumes 120 mW of dc power and occupies an area of 23 mm ?? 16 mm. The receiver can be us... View full abstract»

• ### 30-66 GHz millimetre wave phase shift keying modulator: performance and analysis

Publication Year: 2010, Page(s):8 - 16
Cited by:  Papers (1)
| | PDF (760 KB)

An octave bandwidth millimetre wave gallium arsenide (GaAs) MMIC modulator is demonstrated, wherein a novel method for directly producing QPSK/OQPSK/BPSK modulation directly from baseband IQ signals is presented. A key feature of the architecture is the absence of mixers. Expressions detailing the overall modulator error vector magnitude (EVM) performance with regard to its constituent comp... View full abstract»

• ### Semi-deterministic channel model for multiple input multiple output systems. Part 1: Model development and validation

Publication Year: 2010, Page(s):17 - 25
Cited by:  Papers (1)
| | PDF (449 KB)

In this study a mathematical model, named single interaction scattering reflecting (SISTER), to characterise wireless communication channel for outdoor and indoor environments is introduced which falls into semi-deterministic channel models. The aim of this study was to bridge the gap between the complicated theory of radio signal propagation and the idealised models using statistical channel pr... View full abstract»

• ### Semi-deterministic channel model for MIMO systems Part-II: results

Publication Year: 2010, Page(s):26 - 34
Cited by:  Papers (1)
| | PDF (910 KB)

This article presents the results of applying `single interaction scattering reflecting' (SISTER) model to different multiple-input multiple-output (MIMO) channels. The SISTER model is a semi-deterministic channel model which is described in details in Part-I of this article. MIMO performance is investigated for outdoor and indoor environments considering both line of sight (LOS) and non-line of s... View full abstract»

• ### Finite-difference time-domain simulations of the effects of air gaps in double-shell extended hemispherical lenses

Publication Year: 2010, Page(s):35 - 42
Cited by:  Papers (1)
| | PDF (824 KB)

The effects of parasitic air gaps on the input impedance and radiation characteristics of dense double-shell integrated lens antennas are studied numerically at millimetre waves using the finite-difference time-domain method. The lens core is made up of Macor or silicon, and is coated with a quarter wavelength matching layer. Two kinds of gaps are compared: they are located either (i) between both... View full abstract»

• ### Design and calibration of circular uniform beam array for wideband channel characterisation

Publication Year: 2010, Page(s):43 - 53
Cited by:  Papers (1)
| | PDF (1037 KB)

Antenna arrays are central to the parametric characterisation of the radio channel, which includes the estimation of angle of arrival and angle of departure of the multipath components. Estimation of angular information requires accurate characterisation of the magnitude and phase response of the antenna array. Wideband patch arrays with 45?? directivity were designed and implemented for channel m... View full abstract»

• ### Numerical simulation bistatic scattering from three-dimensional conducting rough surface with forward–backward method-based vector basic functions

Publication Year: 2010, Page(s):54 - 61
| | PDF (1008 KB)

To more really simulate distribution of vector-induced currents along a three-dimensional (3-D) conducting rough surface, it is better for vector basic functions to be used to describe the vector-induced currents. The forward-backward method (FBM) has been further developed to be combined with the vector basic functions to numerically calculate 3-D conducting rough surface scattering problem in th... View full abstract»

• ### Power delay profile modelling of the ultra wideband off-body propagation channel

Publication Year: 2010, Page(s):62 - 71
Cited by:  Papers (6)
| | PDF (595 KB)

This study presents a statistical power delay profile (PDP) model for the evaluation and design of ultra wideband (UWB) off-body communication systems. The analysis is based on extensive real-body measurements carried out in the frequency range between 3.5 and 6.5 GHz. Due to the dependence of the radio propagation channel on the body region (i.e. front, side and back), we gradually develop separa... View full abstract»

• ### Fast and accurate calculation of scattered electromagnetic fields from building faces using Green's functions of semi-infinite medium

Publication Year: 2010, Page(s):72 - 82
Cited by:  Papers (5)
| | PDF (614 KB)

A theoretical method based on the induction equivalence principle and Green's functions is presented here to calculate the scattered electromagnetic fields from exterior plane building facades in urban environment. The reflection coefficient of the whole inhomogeneous structure can be calculated for different incidence angles. The derivation of appropriate Green's functions is presented. The metho... View full abstract»

• ### Effects of intrinsic radiation q on mismatch factor of three types of small antennas: single-resonance, gradual-transition and cascaded-resonance types

Publication Year: 2010, Page(s):83 - 90
Cited by:  Papers (3)
| | PDF (770 KB)

Resonators are traditionally characterised by their quality factor Q, which is inversely proportional to the relative bandwidth. Small antennas are often resonant, so they can be characterised by a Q, except for the fact that the correct quality measure of an antenna is the inverse Q, that is the relative bandwidth, rather than Q. Still, it has become common to study fu... View full abstract»

• ### Analytic stochastic propagation model for urban streets

Publication Year: 2010, Page(s):91 - 98
Cited by:  Papers (1)
| | PDF (604 KB)

Stochastic ray propagation is a method to retain analytic description in topologies where application of Maxwell's equations would be ineffective or impossible. In this paper, a probabilistic model describing ray propagation along an urban street is analysed and discussed. The proposed model bears the simplicity of an analytic approach, and even though not fully descriptive of all propagation mech... View full abstract»

• ### Low insertion loss, wideband bandpass filters with sharp rejection characteristics

Publication Year: 2010, Page(s):99 - 105
Cited by:  Papers (2)
| | PDF (626 KB)

A general circuit configuration using two transmission-line sections is presented to design a sharp-rejection bandpass filter. Sharp rejection characteristic is obtained by creating two transmission zeros across the filter passband by interfering signals propagating through the transmission lines. A simple lossless transmission-line model is used for filter analysis. If an impedance variation of 2... View full abstract»

• ### Dual-polarisation and dual-pattern planar antenna for diversity in body-centric communications

Publication Year: 2010, Page(s):106 - 112
Cited by:  Papers (8)
| | PDF (619 KB)

A novel dual-polarisation/dual-pattern stripline-fed annular-ring slot antenna for body-centric communication systems working in the IEEE 802.11a frequency band at 5.725-5.825-GHz is presented. A stripline feeding technique has been implemented in order to reduce the back radiation level and make the antenna suitable for wearable communication systems. The planar antenna has been designed to provi... View full abstract»

• ### Power amplifier linearisation behaviour in the presence of dynamic effects

Publication Year: 2010, Page(s):113 - 120
| | PDF (512 KB)

This study presents for the first time an integrated overview of the linearisation drawbacks in power amplifiers presenting dynamic effects, either short term or long term, which are usually called memory effects. Working on the concept of best memoryless lineariser (BML), a close analysis of adjacent channel and co-channel distortion is also made. It is then proved mathematically and experimental... View full abstract»

• ### Design of a double-layered spiral antenna for radio frequency identification applications

Publication Year: 2010, Page(s):121 - 127
| | PDF (719 KB)

In this study, the authors describe a novel circularly polarised (CP) double-layered spiral antenna (DLSA) consisting of two main spiral radiators printed on a thin substrate, a feed line and a folded ground plane for a ultra-high-frequency (UHF) band radio frequency identification (RFID) reader. The proposed antenna exhibits broad impedance and CP bandwidth characteristics. The fabricated prototy... View full abstract»

• ### Σ-separability of the far-field beam-pattern due to an arbitrary excitation-function over an elliptical-rim aperture

Publication Year: 2010, Page(s):128 - 140
Cited by:  Papers (2)
| | PDF (289 KB)

This study is the first in the phase-mode analysis literature to analytically characterise the far-field azimuth-elevation (ϕ-θ) beam-pattern due to any arbitrary excitation-function on an elliptical-rim aperture. The key findings include: such an arbitrary excitation-function's far-field beam-pattern is not always ϕ-θ separable. Nonetheless, this beam-pattern is &#... View full abstract»

• ### Permittivity determination of liquid materials using waveguide measurements for industrial applications

Publication Year: 2010, Page(s):141 - 152
Cited by:  Papers (1)
| | PDF (580 KB)

There is a need for a simple and relatively inexpensive microwave method for complex permittivity, ??, determination of liquid materials in industrial applications. Measurement cables that connect the measurement cell to the measuring instrument (usually a vector network analyser) may be either subject to severe phase instability particularly if they are long or metrology-grade cables are not avai... View full abstract»

## Aims & Scope

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

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