A Geometric Study of Tunable Planar Groove Gap Waveguide Cavities

Broadband mm‐wave propagation characterization of planar groove gap waveguide

“…In this article, we present new results on the broadband propagation characteristics of the medium in a manner similar to what was presented for machined GGW previously . This work extends on our previous analyses by presenting a broadband back‐to‐back experimental comparison between PGGWG and SIW, highlighting the slow‐wave property of PGGWG.…”

“…A recently proposed planar groove gap waveguide (PGGWG) structure, a planar implementation of the micromachined groove gap waveguide (GGWG), provides a propagation medium similar to SIW but with the benefit of DC isolated planes, which is advantageous in the biasing of active devices . The basic operating principles of PGGWG have been described previously, and are similar to that of GGWG …”

Implementation of tunable resonators in planar groove gap waveguide technology

“…The loading capacitance C g across the gap p g of Fig. 2 is controlled electrically by placing a varactor diode in reverse bias across the gap [13]. The varactor diode is biased by applying the DC voltage directly to the top conducting plane via a butterfly stub, which presents an RF open circuit at the point of contact with the top plate of the PGGWG cavity and an RF short circuit at the DC side of the stub.…”

“…Extensive parametric studies on the effects of p , h , v d , and h a variation on PGGWG have been presented previously [9, 13]. The results of these parametric studies are applied here, to ensure that the band gap generated by the blind via rows (which effectively form the cavity sidewalls) covers the frequency range of the loaded TE 101 resonant mode of the cavity, as determined by L g (selected to be approximately λ g /2 at the required f 0 , given the value of β reported in [9]) and w .…”

“…This paper presents experimental results for a tunable K a -band (commonly used for satellite communications and 5G base stations [10], radio astronomy [11], and cloud liquid water radiometry [12]) PGGWG resonant cavity exploiting the DC isolation advantage of the structure, using a simple varactor diode basing scheme previously analyzed theoretically [13,14]. We extend on the prior simulation study by presenting a detailed circuit-electromagnetic (EM) co-simulation model, providing measurement results, investigating discrepancies between simulated and measured results through a detailed inspection of the multi-layer PCB stack-up (providing critical data for improved first-iteration modeling and prototyping accuracy for PGGWG development in future, which is not reported in [13,14]), and systematically comparing the measured data to those of other approaches in the state-of-the-art literature.…”