Radome Gap Configuration for Wide Vertical Radiation
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Solution Overview
Problem
Conventional radome structures for radar apparatuses limit the vertical angle range of electromagnetic wave emission, leading to unstable transmission of electromagnetic waves when the antenna device is subjected to rocking motions, such as those caused by waves on a ship.
Innovation Solution
A radome design featuring an outer wall and an inner wall with a gap configuration where the gap is wider at the ends than at the midpoint, utilizing the dielectric edge effect to concentrate the electric field at the center, allowing for low-loss electromagnetic wave emission over a wider angle range without significantly reducing radiation intensity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a double-wall structure is used to cancel reflections, then emission properties are improved, but the vertical radiation pattern becomes narrow
Solution Approach 1:
The patent applies local quality by varying the gap width between outer and inner walls along the circumferential direction. The gap is set to λg/4 in a first circumferential range for reflection cancellation, while in a second circumferential range, the gap is widened to concentrate the electric field at the center, thus achieving both low-loss emission and wide vertical radiation pattern
2Ease of manufacture
If the gap between outer wall and inner wall is constant, then manufacturing is simplified, but electric field concentration and radiation efficiency are reduced
Solution Approach 1:
The patent implements local quality by dividing the radome into different circumferential zones with different gap characteristics. The first zone has a constant gap for ease of manufacture, while the second zone has a widened gap to concentrate the electric field, achieving both manufacturing feasibility and energy efficiency
3Adaptability or versatility
If the radome structure is made more complex to widen the vertical radiation pattern, then adaptability improves, but device complexity increases
Solution Approach 1:
The patent applies parameter changes by modifying the gap width parameter along the circumferential direction rather than changing the overall radome geometry. This allows achieving a wide vertical radiation pattern through a relatively simple structural modification, avoiding excessive device complexity
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The radome design achieves a wider beam width and more secure electromagnetic wave transmission and reception, even when the antenna device is mounted on a movable body like a ship that rocks, by maintaining radiation intensity and expanding the vertical radiation pattern beyond conventional limits.
Implementation Method 1
the electric field of an electromagnetic wave emitted from the antenna is concentrated on a spatial area at the center of the radome by 'edge effect' of the dielectric
Implementation Method 2
by means of being formed on the outer wall and the inner wall whose gap is substantially λg/4 of the emitted electromagnetic wave within the prescribed range of the circumference from the midpoint toward the ends, the radome can perform a low-loss electromagnetic wave emission within the range
Data Source
AI summary
This disclosure provides a radome to be installed on an emission face side of an antenna, which includes an outer wall having a side cross-section formed in a substantially semi-circular shape to include the antenna therein, and an inner wall arranged between the outer wall and the antenna, and formed in a shape to substantially conform to the outer wall. A gap between the outer wall and the inner wall is wider near both ends on the circumference of the substantially semi-circular shape than at a substantially midpoint on the circumference of the substantially semi-circular shape.