The cavity-backed slots SIW antenna that suitable with planar devices is designed, simulated, implemented, and measured. The design is about of two forms of a slotted cavity at bottom side, but the microstrip line is fed at top side. The feeding line and the cavity-backed slots can be implemented on a single substrate using standard printed circuit board (PCB) process. The idea is to merge specific slot models on the cavity back side such as lateraled and meandered slots. An SIW antenna is presented, the simulation results show a 6.35 dB gain, 7.3 dB directivity, and-0.9512 dB (80.33 %) radiation efficiency, and the measurements show that the reflection coefficient (S 11) at 10.2 GHz is-37.23 dB with a bandwidth of 345 MHZ (3.38 %). The combination of cavity-back slots, planar feeding, and SIW antenna design, leads to light weight, size reduction, easy implementation, and simple integration with planar circuits.

In this paper, a new design of miniature, dual-band Hilbert SIW slot antenna is introduced. The antenna is printed on a h=1mm thick dielectric substrate with dielectric constant ( =4.3). The slot antenna is cut on the top plane of the substrate and fed using a microstrip transmission line. The proposed antenna possesses a miniature size with a slot side length of about half the guided wavelength. Furthermore, the antenna performance curves show that it offers a multiband behavior with enhanced bandwidths. The proposed three Hilbert slots SIW antenna resonates at 4.6 and 9.3 GHz with bandwidths of 3.7 and 6.77 % within a return loss of -23.4 and -40.12 dB respectively. The simulation results show gains of 4.41 and 5.76 dB i , with radiation efficiency of -1.360 and -0.7283 dB. Such antennas can be ideal candidates for C and X-band applications. Keywordsa slot antenna, dual-band, substrate integrated waveguide (SIW).