Reconfigurable Antenna with Independent Impedance Matching
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Solution Overview
Problem
Conventional antennas in portable devices have limited frequency tuning ranges due to physical dimensions, restricting their ability to efficiently operate across multiple frequency bands and standards, especially in cognitive radio systems where dynamic frequency adjustment is necessary to avoid interference and optimize bandwidth usage.
Innovation Solution
A reconfigurable antenna design featuring two or more mutually coupled radiating elements with independent impedance-matching circuits, allowing each element to operate in driven, floating, or ground states, enabling flexible frequency tuning and supporting multiple operational modes, including wideband and narrowband frequencies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional antenna designs are used, then the antenna structure is simple, but the frequency tuning range is limited due to physical dimensions
Solution Approach 1:
The antenna is divided into multiple independent radiating elements, each capable of being independently configured through impedance-matching circuits. This segmentation allows each element to be tuned to different frequency bands, thereby expanding the overall frequency tuning range without requiring multiple separate antennas.
Solution Approach 2:
The antenna incorporates reconfigurable impedance-matching circuits that can dynamically adjust the electrical characteristics of each radiating element. This dynamic adjustment capability enables the antenna to adapt its frequency response in real-time, transforming a static structure into a dynamically tunable system that can operate across multiple frequency bands.
2Adaptability or versatility
If multiple different antennas are used to support multiple frequency bands, then the frequency coverage is improved, but the device dimensions and shape are adversely affected
Solution Approach 1:
The antenna system is designed as a universal multi-functional structure where a single integrated antenna assembly can operate across multiple frequency bands. By incorporating multiple radiating elements with independent impedance control, the system achieves multi-band capability without requiring separate dedicated antennas for each frequency range, thereby reducing overall device volume.
Solution Approach 2:
Multiple radiating elements and their corresponding impedance-matching circuits are merged into a single integrated antenna structure. This consolidation allows the system to achieve the functionality of multiple separate antennas while occupying the space of one unified component, thus reducing the overall device volume and simplifying the structural design.
3Adaptability or versatility
If the antenna physical dimensions are increased to expand frequency tuning range, then the frequency adaptability is improved, but the device size increases
Solution Approach 1:
The invention changes the electrical parameters of the radiating elements through reconfigurable impedance-matching circuits rather than physically changing the antenna dimensions. By adjusting the impedance and electrical length of each element independently, the system can tune across a wide frequency range while maintaining compact physical dimensions suitable for portable devices.
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 provides a compact, versatile antenna capable of tuning across a wide frequency range, optimizing radiation performance and reducing device size, making it suitable for multifunctional portable devices like mobile phones, which can support various wireless standards and services.
Implementation Method 1
an antenna capable of generating at least two independently tuneable resonances
Data Source
AI summary
A reconfigurable antenna comprises two or more mutually coupled radiating elements and two or more impedance-matching circuits configured for independent tuning of the frequency band of each radiating element. In addition, each radiating element is arranged for selective operation in each of the following states: a driven state, a floating state and a ground state.