Design and experimental verification of ridge gap waveguide in bed of nails for parallel-plate mode suppression

By Per-Simon Kildal, Ashraf Uz Zaman, Eva Rajo-Iglesias, E. Alfonso, Alejandro Valero-Nogueira. 2011

426 citations recorded by the source corpus.

This study describes the design and experimental verification of the ridge gap waveguide, appearing in the gap between parallel metal plates. One of the plates has a texture in the form of a wave-guiding metal ridge surrounded by metal posts. The latter posts, referred to as a pin surface or bed of nails, are designed to give a stopband for the normal parallel-plate modes between 10 and 23 GHz. The hardware demonstrator includes two 90 bends and two capacitive coupled coaxial transitions enabling measurements with a vector network analyser (VNA). The measured results verify the large bandwidth and low losses of the quasi-transverse electromagnetic (TEM) mode propagating along the guiding ridge, and that 90 bends can be designed in the same way as for microstrip lines. The demonstrator is designed for use around 15 GHz. Still, the ridge gap waveguide is more advantageous for frequencies above 30 GHz, because it can be realised entirely from metal using milling or moulding, and there are no requirements for conducting joints between the two plates that otherwise is a problem when realising conventional hollow waveguides.

Subfields: Aerospace Engineering, Electrical and Electronic Engineering

View Paper: https://www.semanticscholar.org/paper/8fbc5ac2ac1e3274ce9d611be3a7ff235ef6f400

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Citations in the corpus

Ultrawideband Metasurface Lenses Based on Off-Shifted Opposite Layers (2016, background): “1(a) shows a common bed-of-nails unit cell (squared version that can be manufactured more easily than the circled version [14]), and Fig.”
Microstrip-Ridge Gap Waveguide–Study of Losses, Bends, and Transition to WR-15 (2014, background): “Recently, the gap waveguide technology was introduced for making low-loss circuits at millimeter and sub-millimeter waves [1]–[3], where the theoretical background was presented in [1] and [2] and experimental verification in [3].”
Cost-Effective Gap Waveguide Technology Based on Glide-Symmetric Holey EBG Structures (2018, methodology): “Following the studies presented in [2], the electric field attenuation in the lateral direction, as a function of the frequency is shown in Fig.”
Slow-Wave Substrate Integrated Waveguide (2014, background): “In [19], a ridge gap waveguide in which the propagationmode exists in between two parallel metal plates was proposed.”
2$\times$ 2-Slot Element for 60-GHz Planar Array Antenna Realized on Two Doubled-Sided PCBs Using SIW Cavity and EBG-Type Soft Surface fed by Microstrip-Ridge Gap Waveguide (2014, background): “Based on this principle three different versions of gap waveguides called ridge, groove and microstrip gap waveguides were presented in [8] and verified experimentally in [9], [10] and [11], [12], respectively.”
Design and Fabrication of a High-Gain 60-GHz Corrugated Slot Antenna Array With Ridge Gap Waveguide Distribution Layer (2016, background): “The gap waveguide technology introduced in [25-28] overcomes the problem of good electrical contact associated with mechanical assembly, by making use of a texture in one of surfaces that creates a magnetic wall (parallel-plate cut-off).”
Narrow-Band Microwave Filter Using High-Q Groove Gap Waveguide Resonators With Manufacturing Flexibility and No Sidewalls (2012, methodology): “Both the resonator and the filter are based on the newly proposed lowloss gap waveguide technology presented in [5] and later experimentally demonstrated in [6] and [7].”
Design Guidelines for Gap Waveguide Technology Based on Glide-Symmetric Holey Structures (2017, background): “The interest about gap waveguide technology has rapidly raised since its definition in 2009 [1] and the first experimental demonstration in 2011 [2].”