Dual-Band Patch Antenna Structure for Impedance and Band Separation
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Solution Overview
Problem
Existing antenna devices are unable to effectively improve antenna characteristics for multiple communication frequency bands, particularly failing to separate and enhance radio signals for different frequency bands like 2 GHz and 5 GHz without interference.
Innovation Solution
A patch antenna design featuring a rectangular conductor for the 2.45 GHz band and a slot for the 5.3 GHz band, with a power supply point and stub conductor configuration that optimizes impedance matching and resonance for both frequency bands, allowing for improved radiation of horizontally and vertically polarized waves.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single frequency antenna design is used, then the antenna structure is simple, but it cannot handle multiple communication frequency bands simultaneously
Solution Approach 1:
The patent implements a dual-band patch antenna where a single antenna structure supports two different frequency bands (2.45 GHz and 5.3 GHz). The rectangular conductor and slot are designed with specific dimensions and positions that enable resonance at both frequencies, allowing one antenna to perform multiple functions that would traditionally require separate antennas
Solution Approach 2:
The antenna structure is divided into functionally distinct elements: a rectangular conductor for the first frequency band and a rectangular slot for the second frequency band. These segmented elements are positioned at opposite ends of the power supply face, allowing each segment to independently resonate at its designated frequency while sharing the same physical substrate
2Reliability
If impedance matching is optimized for one frequency band, then antenna characteristics are improved for that band, but performance deteriorates for other frequency bands
Solution Approach 1:
The patent applies different impedance matching optimizations to different parts of the antenna structure. The rectangular conductor is optimized with specific dimensions and positioning for 2.45 GHz impedance matching, while the rectangular slot is independently optimized for 5.3 GHz characteristics. This local optimization allows each element to achieve peak performance at its designated frequency without compromising the other band
3Productivity
If radio signals for different frequency bands are transmitted simultaneously, then multi-band communication is enabled, but signal interference occurs
Solution Approach 1:
The antenna physically segments the radiation elements for different frequency bands into separate components (conductor for 2.45 GHz, slot for 5.3 GHz) positioned at opposite ends of the power supply face. This spatial segmentation reduces electromagnetic coupling and interference between the two frequency bands, enabling simultaneous transmission with minimal signal degradation
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 enhances antenna characteristics by increasing the gain of either horizontally or vertically polarized waves depending on the frequency band, improving separation accuracy and usability across dual bands.
Implementation Method 1
The rectangular slot corresponds to communication in a second frequency different from the first frequency
Data Source
AI summary
An antenna device includes a first conductor corresponding to communication in a first frequency band, a ground conductor that faces the first conductor, and a second conductor that is disposed between the first conductor and the ground conductor, faces the first conductor and the ground conductor, and has a power supply point. The second conductor is disposed so as to face one end side of the first conductor in an upper-lower direction of the first conductor. The first conductor has a slot disposed at a position facing the other end side opposite to the second conductor, the slot corresponding to communication in a second frequency band that is different from the first frequency band.