Antenna Structure with Tunable Ground Line for Resonant Frequency
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Solution Overview
Problem
Conventional surface-mount antennas face challenges in achieving consistent resonant frequencies across different wireless communication devices due to varying peripheral conditions, requiring custom designs and leading to increased current loss and decreased antenna gain when adjusting resonant frequencies.
Innovation Solution
A capacitive-power-feeding-type radiating electrode with a ground line having turnback portions and a resonant-frequency adjusting element, allowing for adjustment of the resonant frequency by changing the position or value of the adjusting element without altering the radiating electrode or ground line dimensions, thereby enabling common component usage across multiple devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If custom design of radiating electrode size is performed for each wireless communication device type, then resonant frequency matching is achieved, but design complexity and labor increase
Solution Approach 1:
The patent changes the parameter of ground line length to adjust resonant frequency. By varying the length of the ground line (L1, L2, L3, L4) while keeping the radiating electrode design standardized, the resonant frequency can be precisely tuned to match different wireless communication device requirements without redesigning the entire antenna structure.
Solution Approach 2:
The patent introduces adjustable ground line configurations that can be dynamically selected based on device type. The ground line includes multiple path options with different lengths, allowing the antenna system to adapt to different resonant frequency requirements while maintaining a standardized radiating electrode design.
2Manufacturing precision
If resonant frequency is adjusted by changing circuit on circuit board, then resonant frequency is tuned, but current loss increases and antenna gain decreases
Solution Approach 1:
The patent extracts the resonant frequency adjustment function from the circuit board and relocates it to the ground line structure itself. By making the ground line length the adjustment parameter rather than using circuit modifications, the patent avoids the current loss and gain degradation associated with circuit-based tuning methods.
Solution Approach 2:
The ground line serves as an intermediary element that mediates between the radiating electrode and the circuit board. By adjusting ground line length, the patent achieves resonant frequency tuning without introducing lossy circuit components or modifications that would degrade antenna performance.
3Ease of manufacture
If generic capacitor or inductor components are used for resonant frequency adjustment, then cost is reduced, but resonant frequency precision is compromised
Solution Approach 1:
The patent replaces expensive precision capacitor or inductor components with a simple, inexpensive ground line structure. The ground line, being a basic PCB trace, is much cheaper than precision tuning components while providing sufficient resonant frequency precision through its physical length, which can be precisely controlled during manufacturing.
Solution Approach 2:
The patent substitutes electrical components (capacitors or inductors) with a structural parameter (ground line length). Instead of using electronic components with specific electrical values, the patent uses the physical dimension of the ground line to achieve the same resonant frequency adjustment, eliminating the need for precision electronic tuning components.
4Adaptability or versatility
If surface-mount antenna is used with varying peripheral conditions, then antenna operation is maintained, but resonant frequency varies across different devices
Solution Approach 1:
The patent creates a universal radiating electrode design that can be used across different wireless communication device types. By making the ground line the adjustable parameter rather than the radiating electrode, the same radiating electrode structure can be universally applied while adapting to different devices through ground line length variation.
Solution Approach 2:
The patent changes the parameter being adjusted from radiating electrode dimensions to ground line length. This allows the radiating electrode to remain constant and universal across different devices, while the ground line length is modified to compensate for varying peripheral conditions and achieve consistent resonant frequency.
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 allows for precise adjustment of resonant frequencies without increasing current loss or reducing antenna gain, enabling cost-effective and reliable wireless communication performance across various devices.
Implementation Method 1
the resonant-frequency adjusting element has a capacitance or inductance so as to adjust a resonant frequency of the antenna structure to a predetermined resonant frequency
Implementation Method 2
the resonant-frequency adjusting element has a capacitance or inductance so as to adjust a resonant frequency of the antenna structure to a predetermined resonant frequency
Implementation Method 3
adjust a resonant frequency of the antenna structure to a predetermined resonant frequency
Data Source
AI summary
A capacitive-power-feeding-type radiating electrode is provided on a dielectric substrate, and the dielectric substrate is provided in a non-ground region of a circuit board. In the non-ground region of the circuit board, a ground line electrically connecting the radiating electrode with a ground electrode of the circuit board is provided. The ground line is shaped so as to have at least one turnback portion. On the ground line, a resonant-frequency adjusting element is arranged so as to shortcut a portion of the ground line. The resonant-frequency adjusting element has a capacitance or inductance so as to adjust a resonant frequency of an antenna structure to a predetermined resonant frequency.