Glide-Symmetric Holey Leaky-Wave Antenna With Low Dispersion for 60 GHz Point-to-Point Communications

On the Benefits of Glide Symmetries for Microwave Devices

“…A second example of this technology can be found in Fig. 8(b), where we show a leaky-wave antenna in groove gap waveguide technology [73]. The non-radiating side of this antenna is covered with glidesymmetric holes to confine the electromagnetic signal inside the waveguide, as proposed in [75].…”

Accurate Characterization and Design Guidelines of Glide-Symmetric Holey EBG

“…2(b). Second, the overall operational procedure of the multimodal approach is greatly simplified by choosing a centrally-symmetric unit cell that satisfies (4). Note that this condition does not require the presence of geometrical symmetries in the unit cell itself although the presence of such symmetries could be advantageously used for the computation of the required scattering matrix.…”

“…In general, the smaller the gap, the better the performance of the stopband. In practice, the upper and lower metallic plates are tightly fastened by screws to ensure a close contact, leaving a gap typically no larger than 50 μm, as assumed in [4] and [14]. Thus, g = 50 μm will be considered the worst case scenario for the following studies.…”

“…This arrangement also minimizes the reflections from the EBG by avoiding a saw-toothed interface between the EBG and lateral wall of the waveguide groove [see Fig. 11 (insets)], as mentioned in [4] and [13].…”

“…lower metallic plates are off-shifted by half the period in both orthogonal in-plane directions. The attractive properties of such surface have driven studies on various microwave/millimeter-wave devices, including lenses [1]- [3], leaky-wave antennas [4], flanges with low leakage [5], [6], and filters [7]. In addition, these surfaces find application in gap waveguide technology as a cost-effective alternative for the electromagnetic bandgap (EBG) structures based on bed-ofnails [8], [9].…”