Coupled-Region Antenna Tuning for Multi-Band Portable Radios
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Solution Overview
Problem
Current antennas lack the ability to efficiently provide multiple resonant frequencies and bandwidths, fail to meet the increasing demand for multi-frequency and multi-band capabilities, and are not dynamically tunable over a range of frequencies, especially in portable communication devices.
Innovation Solution
The development of an antenna structure that incorporates additional capacitively loaded inductive loops and active tuning components, allowing for dynamic adjustment of resonant frequencies and bandwidths through varying overlap and separation of elements, enabling multiple resonant frequencies and real-time tuning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single resonant frequency antenna structure is used, then the antenna design is simple and isolated from surrounding structure, but it cannot provide multiple resonant frequencies and bandwidths required for multi-frequency applications
Solution Approach 1:
The antenna structure is segmented into multiple coupled resonant structures, each capable of operating at different frequencies. The first resonant structure and second resonant structure are coupled through a coupling region, allowing each segment to contribute to different frequency bands while maintaining overall system integration
Solution Approach 2:
Multiple resonant structures are merged into a single coupled antenna system where the first resonant structure, second resonant structure, and coupling region work together as an integrated unit. This merging enables multi-frequency operation while sharing common space and support structures
2Volume of moving object
If the antenna size is reduced through capacitive loading, then space integration is improved, but the ability to provide multiple resonant frequencies and dynamic tuning is limited
Solution Approach 1:
The antenna incorporates variable capacitive loading elements that can be dynamically adjusted to change resonant frequencies. The capacitive loading is made variable through switching networks and tunable capacitors, allowing the antenna to adapt its frequency response in real-time while maintaining a compact form factor
Solution Approach 2:
The antenna design changes key parameters such as capacitance values, inductance values, and coupling coefficients to achieve different resonant frequencies. By varying these parameters through switching networks and tunable elements, the antenna can operate across multiple frequency bands without requiring physical size changes
3Object-affected harmful factors
If isolation from surrounding structure is maximized, then electromagnetic interference is reduced, but the antenna cannot interact effectively with surrounding objects for enhanced coupling and bandwidth
Solution Approach 1:
Different parts of the antenna structure have different isolation characteristics. The first resonant structure and second resonant structure are isolated from each other in certain regions to prevent interference, while the coupling region is specifically designed to enable controlled electromagnetic coupling. This local differentiation of isolation properties allows simultaneous achievement of interference reduction and coupling capability
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 solution provides an active tuned loop-coupled antenna capable of optimizing bandwidth and frequency range, enhancing performance and flexibility, particularly in portable devices, by allowing incremental and large bandwidth tuning.
Implementation Method 1
The capacitance is formed by the coupling between the two parallel conductors with the inductive loop formed by connecting the second element to ground
Implementation Method 2
setting up a magnetic dipole mode, the entire contents of which are hereby incorporated by reference. This magnetic dipole mode provides a single resonance
Implementation Method 3
The capacitance is formed by the coupling between the two parallel conductors with the inductive loop formed by connecting the second element to ground. The length of the overlap region between the two conductors along with the separation between conductors is used to adjust the resonant frequency of the antenna
Implementation Method 4
At resonance a cylindrical current going back and forth around the loop is formed. This generates a magnetic field along the axis of the loop which is the main mechanism of radiation
Implementation Method 5
The electrical field remains highly confined between the two elements. This reduces the interaction with surrounding metallic objects and is essential in obtaining high isolation
Data Source
AI summary
A device includes a plurality of antennas, including one or more active antennas, the antennas being configured in one of a plurality of possible configurations to achieve operation in WAN, LTE, WiFi, or WiMax bands, or a combination thereof. In some embodiments, a passive antenna is utilized with lumped loading to fix the antenna tuning state. A primary and auxiliary radiator can be included in the device and configured for WAN/LTE bands, while additional antennas can be incorporated for WiFi and WiMax bands. Various antenna configurations incorporate the antenna having multiple coupled regions.