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# IET Microwaves, Antennas & Propagation

## Filter Results

Displaying Results 1 - 13 of 13
• ### Miniaturisation and electronic tuning techniques for microstrip spurline filters

Publication Year: 2011, Page(s):1 - 9
Cited by:  Papers (1)
| | PDF (752 KB)

A new technique for the miniaturisation and electronic tuning of microstrip spurline filters is presented. The technique is based on connecting a reactive component across the end of the coupling gap of the spurline. The circuit is analysed by using a general coupled-line model, leading to the conclusion that, if a capacitance is used, the filter can be miniaturised or electronically tuned. The an... View full abstract»

• ### Miniaturisation of Ε-negative transmission line based zeroth-order resonator antenna

Publication Year: 2011, Page(s):10 - 16
| | PDF (726 KB)

A previously presented ε-negative transmission line-based zeroth-order resonator antenna structure rescaled to operate at the 2.45 GHz ISM band. The antenna structure is investigated and its feeding network is minimised by using a properly located coaxial. Additionally, a design parameter capable of influencing the radiation pattern is explored. Moreover, this parameter can also reduce the ... View full abstract»

• ### Rectangular microstrip antenna with uniaxial bi-anisotropic chiral substrate-superstrate

Publication Year: 2011, Page(s):17 - 29
Cited by:  Papers (1)
| | PDF (1600 KB)

The effects of the uniaxial anisotropy and chirality of the superstrate on the resonant frequency and bandwidth of rectangular microstrip patch in a substrate-superstrate configuration are investigated. The theoretical study is rigorously formulated via the integral equation and solved using Galerkin-s moment method. The complex resonant frequency for the TM01 mode is studied using sinu... View full abstract»

• ### High-efficiency Ka band microwave monolithic integrated circuit frequency tripler using lumped-element balun

Publication Year: 2011, Page(s):30 - 37
Cited by:  Papers (2)
| | PDF (730 KB)

This work describes a lumped-element balun for use in a miniature, coplanar waveguide frequency tripler pseudomorphic high electron mobility transistor microwave monolithic integrated circuit. The measurement results of the balun show a 1-dB gain balance and a 10 degrees phase balance from 11.6 to 13 GHz. It was used in the design of a 36-GHz monolithic tripler at the input port. A resonant induct... View full abstract»

• ### Closely spaced array of cavity backed slot antennas with pin curtains walls

Publication Year: 2011, Page(s):38 - 47
Cited by:  Papers (3)
| | PDF (928 KB)

An array of two cavity backed slot antennas with pin curtain walls is described. The use of pin curtains is shown to result in greatly reduced fabrication errors and improved repeatability. The effects of the pin curtain parameters on coupling between the array elements are investigated in order to establish design guidelines for achieving a mutual coupling performance which is as good as when usi... View full abstract»

• ### Bandwidth enhancement and decreasing ultra-wideband pulse response distortion of penta-gasket-koch monopole antennas using compact-grounded co-planar wave guides

Publication Year: 2011, Page(s):48 - 56
Cited by:  Papers (1)
| | PDF (912 KB)

The concept is to use a grounded co-planar waveguide (GCPW) to enhance useful characteristics of a fractal antenna. In this case 9.54 dB return loss and input impedance bandwidths are increased. The specific candidate antennas are printed fractal monopoles such as the Penta-Gasket-Koch (PGK) antenna. These topical antennas are used to compare a coaxial fed system with GCPW-fed system. A PGK is app... View full abstract»

• ### Analytical approach to optimise the efficiency of switching mode power amplifiers loaded with distributed matching networks

Publication Year: 2011, Page(s):57 - 67
Cited by:  Papers (3)
| | PDF (631 KB)

This study describes the design methodology of optimising the power-added efficiency (PAE) of switching mode power amplifiers (SMPAs). To maximise efficiency, design optimisation of the harmonic loading networks using an analytical analysis approach is proposed. Indeed, by carefully designing a distributed harmonic control network at the output of the SMPA, the insertion loss through the load netw... View full abstract»

• ### Effects of interface conditions and long-term stability of passive intermodulation response in printed lines

Publication Year: 2011, Page(s):68 - 76
Cited by:  Papers (1)
| | PDF (718 KB)

An experimental investigation of the effect of conductor-to-substrate interface on distributed passive intermodulation (PIM) generation in printed microstrip lines has been undertaken using the custom-designed microwave laminates with removed surface bonding layers and with the commercial adhesion promotion applied to the conductor underside. The study of long-term stability of PIM performance of ... View full abstract»

• ### Measurement-based methodology to design harmonic-loaded oscillators using real-time active load pull

Publication Year: 2011, Page(s):77 - 83
Cited by:  Papers (1)
| | PDF (675 KB)

This study presents a measurement-based methodology to efficiently design a harmonic-loaded oscillator at a targeted frequency using the novel multi-harmonic real-time active load-pull (RT-ALP) technique. Owing to the speed of the RT-ALP technique the design procedure is quasi-interactive. Simulations were first used to design a stable negative resistance around 2.5 GHz using series feedback with ... View full abstract»

• ### Constitutive parameter extraction and experimental validation of single and double negative metamaterials

Publication Year: 2011, Page(s):84 - 94
Cited by:  Papers (2)
| | PDF (1345 KB)

In this study, two independent methods to extract the constitutive parameters of large-scale (more than a wavelength long) metamaterial (MTM) structures are described. One method is based on fitting the simulated inner electric/magnetic field to the electric/magnetic field computed with an analytical model, whereas the other method is based on the scattering matrix parameters. The extraction metho... View full abstract»

• ### Polarisation-sensitive geometric modelling of the distribution of direction-of-arrival for uplink multipaths

Publication Year: 2011, Page(s):95 - 101
Cited by:  Papers (2)
| | PDF (589 KB)

This work extends the geometric modelling of channel fading to account for the effects of the polarisation states of the transmitting/receiving antennas, and for the distribution of the direction of arrival of the uplink multipaths. The derived formulas are closed-form functions, explicitly in terms of a few model parameters idealising the spatial geometry among the transmitter, the scatterers a... View full abstract»

• ### Calderon multiplicative preconditioner based on curvilinear elements for fast analysis of electromagnetic scattering

Publication Year: 2011, Page(s):102 - 112
Cited by:  Papers (1)
| | PDF (713 KB)

In this study, an efficient Calderon multiplicative preconditioner (CMP) based on the curvilinear elements is proposed for preconditioning electric field integral equation (EFIE) for three-dimensional electromagnetic problems. The curvilinear CMP are constructed by the curvilinear Buffa-Christinansen (BC) basis functions and curvilinear Rao-Wilton-Glisson (CRWG) basis functions, both of which can ... View full abstract»

• ### Mutual coupling suppression in closely spaced antennas

Publication Year: 2011, Page(s):113 - 125
Cited by:  Papers (12)
| | PDF (1722 KB)

A technique to significantly reduce the mutual coupling between closely spaced antennas operating at the same frequency band is presented. The method comprises the use of two ground-plane side walls that are erected vertically next to adjacent antennas. The side walls are defected with a lattice pattern of slots to form a defected wall structure (DWS). In addition, the adjacent antennas sharing a ... View full abstract»

## Aims & Scope

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

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