SIW-based dual-beam conical conformal slot array antenna for X-band applications

A design of substrate integrated waveguide (SIW) based conical conformal slot array antenna is presented for X-band applications. The proposed design consists of two SIW arrays of 1 x 6 slot radiators located at phi = 0 degrees and phi = 180 degrees. The slotted arrays are fed using a rectangular waveguide (RWG) to SIW 1 x 2 T-junction power divider. The arrays are projected in the longitudinal direction on a conical surface having a lower and upper radius of 1.66 lambda(0) and 1.33 lambda(0), respectively. The power divider and SIW arrays are designed and simulated in full-wave EM simulation software. It is observed from the results that the proposed array has two main beams in the H-plane located at theta = +/- 90 degrees, and have sidelobe levels (SLLs) of -23 dB and -20 dB, respectively. For the validation of simulation results, the proposed array is fabricated and measured, and a reasonable agreement is observed between both results.