Planar multiband sequentially rotated array with polarisation agility based on the complementary strip-slot element

Abstract

A novel planar travelling-wave ring array with polarisation agility is introduced. The array is built by applying the sequential rotation technique with the complementary strip-slot element. This element is a conventional microstrip series-fed slot with the special feature of very broad impedance bandwidth thanks to the strip superimposed into it on the microstrip layer. The feeding of the array elements and the required phase shift between them are provided by a ring-shaped microstrip line, which is terminated in two ports. Vertical linear polarisation, horizontal linear polarisation, right-handed circular polarisation and left-handed circular polarisation can be generated with this very simple planar structure, just by controlling the phase and amplitude of the excitation at the two ports. Moreover, thanks to the wide impedance bandwidth of the element, multiband behaviour is achievable. A design example that operates at three different bands (centred around 6, 9 and 12 GHz) is analysed, which presents very good matching ( dB), polarisation purity and broadside radiation pattern.

Keywords:

• circular polarisation (CP)
• complementary strip-slot element
• linear polarisation (LP)
• microstrip
• planar antenna
• polarisation reconfigurability
• sequential rotation technique
• travelling-wave array

Additional information

Funding

This work was supported by the Spanish Ministerio de Ciencia e Innovación (Programa Consolider-Ingenio 2010) [grant number CSD2008-00066], EMET, and by the Junta de Andalucía (Spain) [grant number P10-TIC-6883].