Antenna Tuning Element Impedance Characterization
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Solution Overview
Problem
Conventional antenna structures in small electronic devices often exhibit narrower operating bandwidths, limiting their ability to cover all desired communications bands, making it challenging to fit compact antennas that can support multiple frequency ranges.
Innovation Solution
Incorporating antenna tuning elements, such as radio-frequency switches and tunable resistive/inductive/capacitive components, to dynamically adjust impedance characteristics, allowing the antenna to cover a wider range of frequencies, and using a test station to characterize the performance of these tuning elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional antenna structures are used in small electronic devices, then the device form factor remains compact, but the operating bandwidth of the antenna becomes narrow and cannot cover all desired communications bands
Solution Approach 1:
The patent applies dynamics by making the antenna impedance characteristics adjustable through tuning elements. The antenna structure includes variable components that can dynamically change their electrical properties (capacitance, inductance, resistance) to adapt the antenna's resonant frequency and impedance match across different frequency bands, enabling a compact antenna to cover multiple communications bands without increasing volume
Solution Approach 2:
The patent implements parameter changes by modifying the electrical parameters of the antenna system through tuning elements. By changing the capacitance, inductance, and resistance values of the antenna circuit using adjustable components, the resonant frequency and impedance characteristics are tuned to achieve broad frequency coverage across multiple communications bands while maintaining a compact physical structure
2Adaptability or versatility
If antenna tuning elements are added to expand frequency coverage, then the frequency coverage increases, but the device complexity increases
Solution Approach 1:
The patent applies universality by designing a single antenna structure that can serve multiple frequency bands through the inclusion of tuning elements. The antenna system with its adjustable impedance characteristics can be tuned to operate across different communications bands (e.g., GSM, CDMA, WCDMA, LTE), eliminating the need for separate antennas for each band and reducing overall system complexity despite the added tuning components
Solution Approach 2:
The patent implements merging by combining the antenna element with integrated tuning elements (variable capacitors, inductors, resistors) into a single unified structure. This integration allows the tuning functionality to be incorporated within the antenna assembly itself rather than as separate external components, thereby expanding frequency coverage while minimizing the increase in device complexity
Data Source
AI summary
A wireless electronic device may contain at least one antenna tuning element for use in tuning the operating frequency range of the device. The antenna tuning element may include radio-frequency switches, continuously/semi-continuously adjustable components such as tunable resistors, inductors, and capacitors, and other load circuits that provide desired impedance characteristics. A test station may be used to measure the radio-frequency characteristics associated with the tuning element. The test station may provide adjustable temperature, power, and impedance control to help emulate a true application environment for the tuning element without having to place the tuning element within an actual device during testing. The test system may include at least one signal generator and a tester for measuring harmonic distortion values and may include at least two signal generators and a tester for measuring intermodulation distortion values. During testing, the antenna tuning element may be placed in a series or shunt configuration.