The line opening slotted antenna based on microstrip line feed  can obtain the wider impedance bandwidth and better bidirectional radiation performance.
In the paper, it presents a 1/4 wavelength stepped opening slot antenna through adopting the resonator and the narrow slotted loading method is also introduced; it can increase the impedance bandwidth of the opening slot antenna and improve the directional radiation ability accordingly.
In Figure 2(a), the structure and parameters of the L-shaped opening slotted antenna proposed in the paper are shown, which is printed on the dielectric substrate and the substrate material is FR-4; its dielectric constant is 4.2, and the thickness of the dielectric substrate is 0.7 mm.
O., "Millimeter-wave sinusoidal slotted
waveguide antenna," Int.
Hyo, "Radiation of a hertzian dipole in a slotted
conducting sphere, " IEEE Trans.
The beta ratio of the slotted plate is obtained by taking die square root of the quotient of the area of the slots divided by the inside area of the pipe.
3 is a schematic of the flow loop where the single-phase slotted DP meter was tested at the Texas A&M flow lab.
4), that can produce swirl up to a maximum swirl angle of 45[degrees] (where tangential velocity equals the axial velocity), is placed upstream of an orifice and slotted plate to observe the effects of swirl upon meter performance.
Snygg's major research interests are base station antennas, waveguide and slotted waveguide antennas, waveguide filters and multichip modules.
Petersson, "Bandwidth Characteristics of Monopulse Slotted Waveguide Antennas," Proceedings of the Fourth International Conference on Antennas and Propagation (ICAP 85).
Le Kernec, "Structural slotted waveguide antennas for multirotor UAV radio altimeter," in Proceedings of the 2014 IEEE International Conference on Signal Processing, Communications and Computing (ICSPCC 2014), pp.
Rochefort, "Slotted waveguide antenna with a near-field focused beam in one plane," IET Microwaves, Antennas and Propagation, vol.
Zhong, "Waveguide slotted antenna array with broadband, dual-polarization and low cross-polarization for X-band SAR applications," in Proceedings of the 2005 IEEE International Radar Conference Record (RADAR' 2005), pp.