Abstract
In this paper, a pattern and frequency reconfigurable leaky wave X-band antenna based on liquid crystal is designed. The frequency sweep characteristics of traditional leaky wave antennas are replaced by electrical properties of liquid crystal materials. Through the liquid crystal tuning, the main lobe pattern is deflected by 25 degrees at a frequency shift of 1GHz, where the liquid crystal tuning is saturated at 20V bias voltage. The relative frequency reconfigurable bandwidth is 19%, the relative pattern reconfigurable bandwidth is 9.3% and the maximum gain is 10dBi. Moreover, the pattern and frequency response are well preserved during the tuning.
Highlights
With fast development of wireless communication nowadays, antenna reconfiguration is increasingly emphasized for engineering applications
By adding bias voltage to the RF port, the direction of the main lobe of the antenna is deflected by 25 degrees
Compared with different types of leaky-wave antennas based on liquid crystal materials [15], the Half mode corrugated substrate integrated waveguide (HMCSIW) structure proposed in this paper is smaller and conforms to the miniaturization design of antenna
Summary
With fast development of wireless communication nowadays, antenna reconfiguration is increasingly emphasized for engineering applications. The new corrugated substrate integrated waveguide (CSIW) circuit can realize unequal potential of signal line and ground, the tuning of liquid crystal bias voltage can be realized. It can be seen from literature [5] that CSIW replaces the through-hole side wall with a quarter-wave short column and has TE1,0 mode propagation characteristics similar to SIW. Like traditional liquid crystal invert microstrip circuit, LC tuning can be achieved by injecting LC into the dielectric layer between the signal line and the metal ground and adding low frequency bias voltage to the RF port [6].
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