Sheet Antenna with Back-Surface Absorber for Millimeter Wave Miniaturization
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Solution Overview
Problem
Existing millimeter wave radar devices face challenges in miniaturization due to the need for separate components to absorb unwanted spurious emissions, which can interfere with signal characteristics.
Innovation Solution
A compact antenna device with a meta-material structure, featuring an antenna portion and an absorption unit on opposing surfaces of a single sheet, utilizing a stacking structure of conductive and dielectric layers to transmit and receive millimeter waves while absorbing spurious emissions, and a shield unit to reduce interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a separate radio wave absorber is provided to absorb spurious emissions, then spurious absorption performance is improved, but device size increases and miniaturization is hindered
Solution Approach 1:
The patent combines the antenna and radio wave absorber into a single integrated structure where the absorber is formed on the back surface of the antenna substrate. This merging eliminates the need for separate absorber components while maintaining effective spurious absorption, thereby resolving the contradiction between absorption performance and device size.
Solution Approach 2:
The antenna substrate serves dual functions: as the structural base for the antenna elements and as the mounting surface for the radio wave absorber. This multi-functionality allows the same component to fulfill multiple roles, improving spurious absorption without increasing overall device volume.
2Volume of moving object
If the antenna and absorption unit are integrated in a single sheet structure, then device size is reduced for miniaturization, but interference between antenna and absorption unit may increase
Solution Approach 1:
A shield unit is introduced as an intermediary component between the antenna and the absorption unit. This shield unit acts as a mediator that prevents direct electromagnetic coupling and interference between the two functional elements, enabling their close integration without compromising signal integrity.
Solution Approach 2:
The absorption unit and shield unit are nested on the back surface of the antenna substrate, creating a compact layered structure. This nesting arrangement allows multiple functional layers to coexist in a limited space while the shield unit provides isolation to prevent interference.
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
Enables miniaturized configuration for transmitting and receiving millimeter waves while effectively reducing unwanted emissions, maintaining favorable transmission and absorption characteristics.
Implementation Method 1
an absorption unit provided on the other surface of the sheet and configured to absorb spurious
Implementation Method 2
the antenna portion and the absorption unit may have a meta material structure. Cells may be periodically arranged on the antenna portion and the absorption unit respectively
Data Source
AI summary
There is provided an antenna device configured to be shaped as a sheet. The antenna device includes an antenna portion provided on one surface of the sheet and configured to implement at least one of transmission of a transmission wave and reception of a reflected wave from a target, and an absorption unit provided on the other surface of the sheet and configured to absorb spurious.