Multiband Antenna Resonant Cavity Design for Compact Frequency Coverage
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Solution Overview
Problem
Existing multiband antennas require multiple antennas or radiation entities to cover various frequency bands, leading to increased size and potential interference, making it challenging to achieve compact multiband operation in limited spaces.
Innovation Solution
A multiband antenna design featuring a grounding sheet, micro-strip lines, and a resonant cavity with adjustable gaps and positions, allowing for single-entity multiband operation by utilizing a coplanar waveguide structure and feed-in terminal to transmit signals across multiple frequency bands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple antennas or radiation entities are used to cover different frequency bands, then the frequency coverage is improved, but the antenna area increases and interference occurs
Solution Approach 1:
The patent combines multiple radiation entities (first and second micro-strip lines) into a single integrated antenna structure that operates across multiple frequency bands. The micro-strip lines are positioned at different locations within the same antenna body, allowing the antenna to function as both a single entity and a multi-band system simultaneously, thus improving frequency coverage without increasing overall antenna area.
Solution Approach 2:
The antenna is designed to perform multiple functions within a single structure by incorporating radiation entities that operate at different frequency bands. The first micro-strip line handles lower frequency bands while the second micro-strip line handles higher frequency bands, enabling the single antenna to universally cover multiple frequency ranges without requiring separate dedicated antennas for each band.
2Adaptability or versatility
If multiple antennas are used to cover different frequency bands, then the frequency coverage is improved, but device complexity increases
Solution Approach 1:
The patent merges multiple antenna functions into a single integrated structure by positioning multiple micro-strip lines within the same antenna body. This unified design reduces device complexity compared to using separate antennas for each frequency band, as it eliminates the need for multiple independent antenna structures, mounting positions, and associated feeding networks.
Solution Approach 2:
The antenna achieves multi-functionality by incorporating radiation entities that operate across different frequency bands within a single device. This universal design allows one antenna structure to replace multiple specialized antennas, thereby reducing overall device complexity while maintaining comprehensive frequency coverage capabilities.
3Adaptability or versatility
If multiple antennas are placed in limited space, then frequency coverage is improved, but interference occurs among antennas
Solution Approach 1:
The patent applies local quality by positioning radiation entities at specific locations within the antenna body and separating them with appropriate spacing. The first micro-strip line is positioned at a first location and the second micro-strip line is positioned at a second location, with gaps between them. This localized arrangement ensures that each radiation entity operates in its own electromagnetic environment, reducing mutual interference while maintaining compact overall dimensions.
Solution Approach 2:
The patent utilizes spatial dimensionality by arranging multiple micro-strip lines in different positions and orientations within the same antenna body. The radiation entities are separated in three-dimensional space with specific gaps between them, allowing each to radiate in slightly different directions and patterns, thereby reducing interference while covering multiple frequency bands within a compact footprint.
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 design enables efficient multiband operation in a compact form, preventing interference and maintaining performance across multiple frequency bands without increasing the antenna's volume, as demonstrated by improved return loss and radiation efficiency.
Implementation Method 1
a connecting unit, connecting a terminal of the first side of the grounding sheet and a terminal of the first micro-strip line, for forming a resonant cavity with the first side of the grounding sheet and the first micro-strip line
Data Source
AI summary
A multiband antenna for receiving or transmitting wireless signals of a plurality of frequency bands includes a grounding sheet, formed with a hole at a first side, for providing grounding, a first micro-strip line, substantially parallel to the first side of the grounding sheet, a connecting unit, connecting to the first side of the grounding sheet and the first micro-strip line, for forming a resonant cavity with the first side of the grounding sheet and the first micro-strip line, a second micro-strip line, formed in the resonant cavity and substantially parallel to the first micro-strip line, a third micro-strip line, extending from the hole of the grounding sheet to the second micro-strip line, and a feed-in terminal, formed on the third micro-strip line within the hole, for transmitting the wireless signals.