Liquid crystal-based tunable CRLH-transmission line for leaky wave antenna applications at Ka-Band

2014 ◽  
Vol 6 (3-4) ◽  
pp. 325-330 ◽  
Author(s):  
María Roig ◽  
Matthias Maasch ◽  
Christian Damm ◽  
Rolf Jakoby
Keyword(s):  
Liquid Crystal ◽  
Transmission Line ◽  
Unit Cell ◽  
Leaky Wave ◽  
Ka Band ◽  
Left Handed ◽  
Leaky Wave Antenna ◽  
Wave Antenna ◽  
Operation Frequency

In this work, a liquid crystal based tunable composite right/left-handed transmission line for future leaky wave antennas working at the Ka-band is presented. The tuning of the liquid crystal is achieved by means of magnetic and electric biasing. For this purpose, different prototypes are fabricated for each biasing technique and their dispersive characteristics compared. Electric tunability is achieved by implementing highly resistive bias lines in the unit cell layout. Both techniques yield similar tuning capabilities at the operation frequency of 27GHz whereas the electric one has the advantage of being easily integratable in the layout.

Investigation and application of a liquid crystal loaded varactor in a voltage tunable CRLH leaky-wave antenna at Ka-band

2015 ◽  
Vol 7 (3-4) ◽  
pp. 361-367 ◽  
Author(s):  
María Roig ◽  
Matthias Maasch ◽  
Christian Damm ◽  
Rolf Jakoby
Keyword(s):  
Liquid Crystal ◽  
Leaky Wave ◽  
Beam Scanning ◽  
Ka Band ◽  
Interdigital Capacitor ◽  
Left Handed ◽  
Leaky Wave Antenna ◽  
Wave Antenna

In this work, a voltage tunable interdigital capacitor loaded with liquid crystal (LC) is investigated and its application for a composite right/left-handed leaky-wave antenna (LWA) is demonstrated. The tuning capability of the varactor is confirmed by simulation and measurement. A material tunability of 25% of the used LC yields a measured varactor tunability of 9%. Based on this, a tunable LWA with a beam scanning of 14 degrees at 26.7 GHz is implemented and measured.

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