Design of antennas mounted on complex platforms using the characteristic mode (CM) and characteristic basis (CB) function methods

2018 ◽  
pp. 35-76
Author(s):  
Raj Mittra ◽  
Ashwani Kumar ◽  
Chao Li
Keyword(s):  
Characteristic Mode

scholarly journals Bandwidth Optimization of a Textile PIFA with DGS Using Characteristic Mode Analysis

Sensors ◽  
2021 ◽  
Vol 21 (7) ◽  
pp. 2516
Author(s):  
Bashar Bahaa Qas Elias ◽  
Ping Jack Soh ◽  
Azremi Abdullah Al-Hadi ◽  
Prayoot Akkaraekthalin ◽  
Guy A. E. Vandenbosch
Keyword(s):  
Wireless Body Area Network ◽  
Simulation Software ◽  
The Body ◽  
Mode Analysis ◽  
Area Network ◽  
Defected Ground Structure ◽  
Characteristic Mode ◽  
Antenna Structure ◽  
Rectangular Patch ◽  
Conventional Optimization

This work presents the design and optimization of an antenna with defected ground structure (DGS) using characteristic mode analysis (CMA) to enhance bandwidth. This DGS is integrated with a rectangular patch with circular meandered rings (RPCMR) in a wearable format fully using textiles for wireless body area network (WBAN) application. For this integration process, both CMA and the method of moments (MoM) were applied using the same electromagnetic simulation software. This work characterizes and estimates the final shape and dimensions of the DGS using the CMA method, aimed at enhancing antenna bandwidth. The optimization of the dimensions and shape of the DGS is simplified, as the influence of the substrates and excitation is first excluded. This optimizes the required time and resources in the design process, in contrast to the conventional optimization approaches made using full wave “trial and error” simulations on a complete antenna structure. To validate the performance of the antenna on the body, the specific absorption rate is studied. Simulated and measured results indicate that the proposed antenna meets the requirements of wideband on-body operation.

‘A Party for Owners or a Party for Earners?’ How far did the British Conservative Party Really Change After 1945?

1987 ◽  
Vol 37 ◽  
pp. 49-63 ◽  
Author(s):  
John Ramsden
Keyword(s):  
Economic Policy ◽  
Conservative Party ◽  
The Political ◽  
New Economic Policy ◽  
Characteristic Mode ◽  
Party Leaders ◽  
Electoral Defeat ◽  
Post War ◽  
Looking Back

THE period spent in opposition between 1945 and 1951 has generally been thought of as a key to the understanding of the activities of the post-war British Conservative Party. Autobiographies of the Party leaders of the time began to appear at the end of the Fifties, already looking back to a period in which the Conservatives had decisively changed their approach. So for example, Lord Woolton's Memoirs reviewed not only a term as Party Chairman which had been a highlight of his own crowded career, but also his sharing in a major act of transformation, a transformation that had led on to Conservative success since 1951: ‘the change was revolutionary’. Other key figures in the organisation reached similar conclusions as their own accounts appeared: David Maxwell-Fyfe argued that the new Party rules which he had drawn up had not only decisively widened the political base of British Conservatism, but that events since had confirmed the importance of the change. R. A. Butler's account of The Art of the Possible argued in 1971 that ‘the overwhelming electoral defeat of 1945 shook the Conservative Party out of its lethargy and impelled it to re-think its philosophy and re-form its ranks with a thoroughness unmatched for a century’. The effect was to bring both the policies of the Party and ‘their characteristic mode of expression’, as he puts it, ‘up to date’. As recently as 1978, Reginald Maudling—a key figure behind the scenes in 1945–51 as a speechwriter from Eden and Churchill and as the organising secretary of the committee which produced the Industrial Charter of 1947—reached much the same view: ‘We were at that time developing a new economic policy for the Conservative Party … It marked a substantially different approach for post-war Conservative philosophy.

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