• Waveguide Slot Antenna Arrays Ham Radio
• Waveguide Slot Antenna Arrays Tuner
• Waveguide Slot Array Antenna Design
• Waveguide-slot Array Antenna Designs For Low-average-sidelobe Specifications

Slotted antennas, a complement to dipole antennas, have slots a λ/2 long and a fraction of a wavelength wide. The antenna propagates based on Babinet’s principle of a resonant radiator. The key difference between a dipole and a slotted antenna is the field components are interchanged in orientation. Because of the vertical electric field in horizontal orientation, slot arrays can fit on the surface of moving objects without introducing much aerodynamic drag and wind load. For the same size, slotted waveguide array antennas are more efficient than any other planar antenna. Versatility in slot feeding options, ease of weather-proofing and mechanical stability make slotted antennas well-suited for military and defense applications.

For radar and communication systems, Eravant, formerly SAGE Millimeter, has developed the SAW-3533532716-28-L2-WR, a slotted waveguide array antenna operating at 35 GHz with 500 MHz bandwidth. The bandwidth can be increased by increasing the slot width, with cross-polarization increasing as a trade-off. The SAW-3533532716-28-L2-WR slot array supports linear, vertically polarized signals with high aperture efficiency and low VSWR. The antenna has 27 dBi gain with a half-power beamwidth of 16 degrees in the E-plane and 2 degrees in the H-plane. A radome of LEXAN polycarbonate makes the antenna suitable for outdoor applications. Its 1 lb. weight and small size - measuring 11.84 in. x 3.85 in. and just 0.93 in. thick - eases mounting and minimizes the dynamic load to the overall structure. A groove for an O-ring in the standard WR28 waveguide flange (UG-599/U) pressure seals the connecting interface. Integrating the antenna with a T/R diplexer, a dual channel I/Q receiver and an oscillator makes a complete package for many system applications, such as traffic management, law enforcement, communications and military surveillance.

The slot array antennas offered by Eravant span WR90 to WR10 and are designed with MIL-F-3922 designated standard flanges as the microwave connector interface.

Eravant, formerly
SAGE Millimeter
Torrance, Calif.
www.eravant.com

Design and analysis of slotted waveguide antenna arrays

Abstract

The typical design of a waveguide slot array begins with an examination of the requirements connected with the definition of the size of the array, the types of slots, and feed methods; this is followed by analysis to determine the dimensions and positions of each slot, and a prediction of array performance; the final step is fabrication and test of a breadboard model to validate the analytical design. These design and analysis aspects are considered in connection with the types of waveguide slots, slot-array architecture, equivalent circuit models, pattern calculations, and analysis techniques. Attention is also given to the use of available design data, experimental techniques, tests using subarrays, experimental measurements of radiating slots, and near-field and far-field measurements.

Waveguide Slot Antenna Arrays Ham Radio

Waveguide Slot Antenna Arrays Tuner

Waveguide slot arrays are widely used in radar and telecommunication applications, especially where high gain, increased power-handling capacity and compact dimensions are critical. Radar applications demand radiation patterns with sharp narrow main beams and very specific.

The typical design of a waveguide slot array begins with an examination of the requirements connected with the definition of the size of the array, the types of slots, and feed methods; this is followed by analysis to determine the dimensions and positions of each slot, and a prediction of array performance; the final step is fabrication and test of a breadboard model to validate the. The procedure to design a waveguide slot array antenna is explained, and also the analysis model to design the element is discussed as well as the scattering matrix in connecting the equivalent. The models of the Slotted waveguide antenna have been built and analyzed and agree well with results reported from 1. Montesinos Ortego, 'Contribution to the design of waveguide fed compound slot arrays by means of equivalent circuit modeling' 2.

Waveguide Slot Array Antenna Design

Waveguide-slot Array Antenna Designs For Low-average-sidelobe Specifications

• Antenna Arrays;
• Antenna Design;
• Microwave Antennas;
• Slot Antennas;
• Waveguide Antennas;
• Bandwidth;
• Circuit Diagrams;
• Far Fields;
• Near Fields;
• Communications and Radar