Waveguide Antenna Layout for EIRP Control and Close-Range Detection
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Solution Overview
Problem
Existing antenna systems face challenges in balancing antenna gain to prevent Equivalent Isotropically Radiated Power (EIRP) from exceeding regulatory limits while maintaining sufficient receiver sensitivity, and they struggle with detection accuracy due to multiple reflections as targets get closer.
Innovation Solution
The antenna apparatus incorporates a waveguide with a radio wave absorber positioned to attenuate transmitted waves and absorb multiple reflections, using a radio wave lens to focus both transmitted and received waves, ensuring compliance with EIRP limits and enhancing receiver sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If antenna gain is increased to improve receiver sensitivity, then receiver sensitivity is improved, but EIRP may exceed regulatory upper limits
Solution Approach 1:
The patent applies local quality by placing radio wave absorbers at specific locations within the waveguide - on the first inner wall surface facing the transmitting antenna and on the second inner wall surface facing the receiving antenna. This localized placement allows differential treatment of transmitted and received waves, enabling high receiver sensitivity while suppressing EIRP through selective absorption in different spatial zones.
Solution Approach 2:
The waveguide interior is segmented into multiple surfaces with different radio wave absorption properties. The first inner wall surface has a radio wave absorber for suppressing transmitted waves, while the second inner wall surface has a radio wave absorber for handling received waves. This segmentation allows independent optimization of transmission and reception characteristics.
2Object-generated harmful factors
If antenna gain is decreased to suppress EIRP increase, then EIRP compliance is achieved, but sufficient receiver sensitivity cannot be achieved
Solution Approach 1:
Different radio wave absorption characteristics are applied to different locations: the first inner wall surface near the transmitting antenna uses absorbers to suppress EIRP, while the second inner wall surface near the receiving antenna uses absorbers to maintain reception quality. This local differentiation resolves the contradiction between EIRP suppression and receiver sensitivity.
Solution Approach 2:
The waveguide is divided into functional segments with distinct absorption properties. The first segment (first inner wall surface) focuses on transmission control, while the second segment (second inner wall surface) focuses on reception optimization, allowing simultaneous achievement of EIRP compliance and adequate sensitivity.
3Object-generated harmful factors
If radio wave absorber is placed to attenuate transmitted waves, then EIRP is suppressed, but detection accuracy may be affected by multiple reflections
Solution Approach 1:
Radio wave absorbers are strategically placed on specific inner wall surfaces at locations where they effectively suppress transmitted waves and reduce multiple reflections that would degrade detection accuracy. The localized placement ensures that absorption occurs primarily in regions contributing to EIRP while minimizing interference with the detection path.
Solution Approach 2:
The patent converts the potentially harmful effect of multiple reflections into a benefit by using radio wave absorbers to deliberately introduce controlled absorption. This converts unwanted reflected energy into absorbed energy, reducing multiple reflection interference and improving detection accuracy while simultaneously suppressing EIRP.
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
This design effectively suppresses EIRP increases and improves receiver sensitivity, allowing for accurate detection of closer targets by minimizing multiple reflections and maintaining high detection performance.
Implementation Method 1
a first radio wave absorber disposed on the first aperture side in a space surrounded by the first inner wall surface. At least part of the first radio wave absorber is located inside a first path of a first direct wave that is radiated from the transmitting antenna
Implementation Method 2
a radio wave lens fixed to the second aperture... a first direct wave that is radiated from the transmitting antenna, directly reaches the radio wave lens, and passes through the radio wave lens
Implementation Method 3
The antenna apparatus incorporates a waveguide with a radio wave absorber positioned to attenuate transmitted waves and absorb multiple reflections
Data Source
AI summary
An antenna apparatus includes a board, an integrated circuit chip including a transmitting antenna and a receiving antenna and mounted on the board, a waveguide having a first aperture provided on the board side and surrounding the transmitting antenna and the receiving antenna in aperture view, a second aperture provided on a rear side with respect to the first aperture in a radiation direction of the transmitting antenna, and a first inner wall surface connecting the first aperture and the second aperture, a radio wave lens fixed to the second aperture, and a first radio wave absorber disposed on the first aperture side in a space surrounded by the first inner wall surface. At least part of the first radio wave absorber is located inside a first path of a first direct wave, and the first radio wave absorber is located outside a second path of a second direct wave.