Design and Fabrication of a High Gain Composite R/L-Handed SIW Leaky-Wave Antenna in X-band

Leaky-wave antennas based on composite right/left-handed (CRLH) substrate integrated waveguide (SIW) are investigated and presented in this paper. By introducing series interdigital capacitors, which are realized by etching slots on the waveguide surface, a balanced CRLH waveguide leaky-wave antenna with a continuous beam-steering capability has been implemented. The backfire radiation is obtained when the waveguide is operated below its characteristic cutoff frequency while the broadside radiation is achieved at the balancing frequency point. By embedding the series interdigital capacitors in both the top surface and the ground of the SIW, a frequency scanned leaky-wave antenna characterized by double-side radiation or a quasi-omnidirectional feature is achieved. The measured results show that the proposed antennas offer a scanning angle covering almost backfire-to-endfire directions with relatively high gains

کلیدواژه ها:

Composite right/left-handed (CRLH) ، leaky-wave antennas ، substrate integrated waveguide (SIW)