Frequency-Selective Dipole Antennas With Reactive Tuning
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Solution Overview
Problem
Current dipole antennas require multiple elements to cover various communication frequency bands, leading to increased cost, component count, and occupied volume, while also necessitating additional filtering components that contribute to insertion loss and power diversion in mobile wireless devices.
Innovation Solution
A single folded dipole antenna with high dielectric density ceramic material used as reactive tuning elements, configured to create a distributed network filter that selectively resonates across multiple frequency bands, allowing for narrow conductive pass bands to isolate uplink and downlink frequencies, and can be actively tuned to accommodate different communication bands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple antenna elements are used to cover various communication frequency bands, then frequency coverage is improved, but device complexity, cost, and occupied volume increase
Solution Approach 1:
The patent implements a single dipole antenna element that can operate across multiple frequency bands (GSM 850, GSM 900, GSM 1800, GSM 1900, UMTS, and WiFi) by using reactive tuning elements that can be switched to different configurations. This multi-functional design eliminates the need for separate antenna elements for each frequency band, thereby reducing device complexity and occupied volume while maintaining broad frequency coverage
Solution Approach 2:
The patent employs switchable reactive tuning elements (inductive and capacitive) that can be dynamically reconfigured to adjust the antenna's resonant frequency. This dynamic tuning capability allows a single antenna element to adapt to different communication bands on demand, providing frequency coverage comparable to multiple fixed-frequency antennas without the associated complexity and space requirements
2Adaptability or versatility
If multiple antenna elements are used to cover various communication frequency bands, then frequency coverage is improved, but occupied volume increases
Solution Approach 1:
The patent implements a single dipole antenna element that can operate across multiple frequency bands (GSM 850, GSM 900, GSM 1800, GSM 1900, UMTS, and WiFi) by using reactive tuning elements that can be switched to different configurations. This multi-functional design eliminates the need for separate antenna elements for each frequency band, thereby reducing device complexity and occupied volume while maintaining broad frequency coverage
3Adaptability or versatility
If filtering components are added to isolate frequency bands, then frequency selectivity is improved, but insertion loss and power diversion increase
Solution Approach 1:
The patent extracts the frequency filtering function from separate filtering components and integrates it directly into the antenna structure through reactive tuning elements. By combining the antenna and filter functions into a single integrated structure, the system achieves frequency selectivity without the additional insertion loss and power diversion that would result from cascading separate filter components
Solution Approach 2:
The patent merges the antenna radiation function with the frequency filtering function into a single integrated structure. The reactive tuning elements serve dual purposes: adjusting the antenna's resonant frequency and providing frequency selectivity. This consolidation eliminates the need for separate filtering components, thereby reducing insertion loss and power diversion while maintaining frequency selectivity
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 solution minimizes the need for multiple antenna systems and filtering components, reducing cost, component count, and occupied volume while maintaining high radiation efficiency and signal integrity, and allows a single antenna to cover multiple frequency bands with reduced insertion loss.
Implementation Method 1
Resonant dipole antennas are a class of antennas where the electromagnetic radiation emissivity/sensitivity is pronounced at the antenna's fundamental frequency and harmonics of the fundamental frequency
Implementation Method 2
high dielectric density ceramic material (εR≥10 and/or μR≥10) has been selectively deposited into electromagnetically coupled regions
Implementation Method 3
high dielectric density ceramic material (εR≥10 and/or μR≥10) has been selectively deposited into electromagnetically coupled regions that function as 'reactive tuning elements' to produce the desired spectral response
Data Source
AI summary
A dipole antenna forms a distributed network filter.