Ridge-Loaded Small Round-Ended Slot for Waveguide Slot-Array Antenna

Abstract

In this paper, a small round-ended slot loaded by double ridges on the broad wall of a rectangular waveguide is presented as an element for a waveguide slot-array antenna(WSAA). By properly adjusting the ridge dimension, a resonance of the slot at a desired frequency can be achieved. The resonant length of the proposed slot is about 0.26   (free space wave length) at the resonance frequency. The proposed resonant slot has some advantageous properties, such as small size, small resonant conductance, and short and stable resonant slot length. In addition, the characteristics of the slots are slightly affected by the adjacent elements when the slots are arrayed for a waveguide slot antenna. A 4×1 WSAA with -20 dB side-lobe level(SLL) is designed, fabricated, and tested experimentally. The measured results are well agreed with the simulated ones and have an SLL of -15.9 dB and a half-power beam width of 110.2° in the E-plane and 21.2° in the H-plane, respectively, at 9.41 GHz.

Employing the dumbbell-shaped longitudinal slot antennas in the planar slotted antenna arrays

“…The dumbbell-shaped slots have been employed to design the slotted array antennas since several decades earlier [8]. It was also well-understood that the resonant length of the dumbbell-shaped slot antennas is much smaller than the round-ended slot antennas [8,47,48]. However, such type of slot antennas was mainly employed because of their more straightforward realization as well as the higher mechanical strength of the implemented antennas [8].…”

A computer‐aided approach for designing dielectric‐covered planar array antennas consisting of longitudinal slots

“…Employing a special type of a waveguide to feed the slot antennas is usually imposed by the antenna design specifications. Furthermore, slot antennas in different shapes have also been proposed for employing in slotted antennas …”

“…Furthermore, slot antennas in different shapes have also been proposed for employing in slotted antennas. [13][14][15][16][17] Several design methods have been proposed in the literature for designing the slotted array antennas fed by the rectangular waveguides. [18][19][20][21][22][23][24][25][26] Depending on the size of the array (number of slots in the array), they can be divided into two categories.…”