Groove Gap Waveguide with Interlaced Pins for Higher-Frequency Fabrication

Gap waveguide is attractive for millimeter-wave and terahertz-wave devices for its low-loss transmission. However, the fabrication would be difficult if the periodic pins that generate electromagnetic bandgap are closely spaced and thin, especially at a high frequency. This manuscript presents a groove gap waveguide, where interlaced pins are extended from both top and bottom plates to maximize the use of space and enlarger the space between the pins for reducing the fabrication difficulty. To demonstrate the feasibility, the dispersion property of the unit cell is analyzed and two parallel H-plane groove gap waveguides separated by two rows of interlaced pins are simulated.