Resonant slot antenna array on a ridge gap waveguide

Abstract

The design of a resonant slot array antenna in a single layer ridge gap waveguide is presented. Linear and planar array configurations are developed. The linear array includes eight series slots in the ridge gap waveguide that is powered by a coaxial transmission line. The planar antenna array is developed by incorporating a power divider of four branches in the ridge gap waveguide layer. Each branch of the power divider feeds the linear array. The planar antenna detail design for Ku‐band is provided, and the manufactured antenna is measured. The antenna impedance bandwidth of 7% at 13.5 GHz centre frequency, the gain of 20.5 dBi and the side lobe level of <14 dB are obtained.

A flat aperture antenna composed of a series fed H‐plane horn array excited by a ridge gap waveguide horn

“…The designed antenna presents the maximum gain of 24.5 dBi, the maximum efficiency of 90% and the side lobe level (SLL) lower than −22 and −13 dB in H‐ & E‐planes, respectively. The proposed structure introduces a very simple configuration with low complexity in which the design and fabrication difficulty, in contrast to the works presented in [14–18], does not enhance for larger apertures (higher gains).…”

“…In [15], about 12% bandwidth with a maximum gain of 25 dBi is achieved. In [16][17][18], the array of series fed longitudinal slot columns is used to form the antenna aperture in which the feed network is associated with lower complexity compared to that presented in [14] but at the cost of providing lower bandwidth. In [19], the array of long transverse slots is applied to form the antenna aperture presenting a quite simple structure with low fabrication complexity.…”

“…Different techniques including conventional metallic waveguides [8][9][10], substrate integrated waveguides [11][12][13], and gap waveguides [14][15][16][17][18][19] have been applied to implement slot arrays. Metallic waveguides are low loss and efficient structures, however, they suffer from fabrication cost and complexity at mm-wave ranges as fine electrical contact between their metal blocks is required.…”

“…Until now, different aperture array antennas with directive radiation have been designed and implemented using the gap waveguide technology [14][15][16][17][18][19]. In [14], the array of parallel fed slots is applied in the antenna radiating layer and 14% bandwidth with maximum gain and efficiency of 26 dBi and 80% is provided but at the cost of being associated with a quite complicated corporate feed network, which enhances the fabrication complexity and cost especially for higher gains.…”

Ka-Band Single-Layer High-Efficiency Circular Aperture Microstrip Array Antenna

“…In order to realize the single-layer series-fed structure, a method of introducing short stubs arranged periodically with a waveguide wavelength as a period on the microstrip line is proposed in [9], but this design is not suitable for large-scale arrays. e gap waveguide structure is often used in millimeter-wave antennas [10,11]; compared with the microstrip structure, the waveguide structure has lower loss and higher efficiency in millimeter-wave band; however, this structure also requires double-layer or even multi-layer, which leads to its disadvantages of complex structure and higher manufacture cost.…”