Wireless Circuit Antenna Resonance Cavity Design
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Solution Overview
Problem
Planar Inverted-F Antennas (PIFA) in handheld devices have limited efficiency and operating frequency due to restricted resonance current and interference from metal structures within the device.
Innovation Solution
A wireless communication circuit with a coupling unit on the device's surface, an impedance matching unit, and a system grounding surface that adjusts impedance values to enhance electromagnetic wave transmission and reception, minimizing signal reflection and interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a Planar Inverted-F Antenna is used in a handheld device, then the antenna can be integrated into the device structure, but the antenna efficiency is limited due to restricted resonance current area
Solution Approach 1:
The patent transitions from a conventional planar antenna structure to a three-dimensional resonant structure by introducing a resonant cavity formed between the grounding electrode, the antenna element, and the side wall of the housing. This dimensional change allows the resonance current to extend into the third dimension (depth), significantly increasing the effective resonance area and improving antenna efficiency while maintaining integration within the handheld device.
Solution Approach 2:
The antenna system is nested within the housing structure of the handheld device. The resonant cavity is formed by utilizing the housing side wall as part of the antenna structure, and the grounding electrode is integrated with the internal grounding system. This nesting approach allows the antenna to be fully integrated into the device without requiring additional external space, while the nested configuration enables the resonance current to utilize the entire cavity volume.
2Device complexity
If a Planar Inverted-F Antenna is used, then the antenna structure is simple, but the lowest operating frequency is limited
Solution Approach 1:
The patent employs parameter changes by adjusting the dimensions of the resonant cavity (length, width, height), the position and size of the feed electrode, and the grounding electrode configuration to achieve different resonant frequencies. The side wall of the housing acts as a variable parameter that can be adjusted to change the cavity volume, thereby tuning the lowest operating frequency. This allows the same basic structure to accommodate multiple frequency bands by simply modifying geometric parameters.
3Ease of manufacture
If metal structures or metal components are placed inside the electronic device, then the device can be assembled, but interference is generated that affects antenna performance
Solution Approach 1:
The patent extracts the resonant cavity from the conventional planar configuration and positions it in a three-dimensional space within the housing, separating the resonance path from interfering metal components. The grounding electrode is specifically positioned to create a controlled electromagnetic environment that isolates the resonant current from external interference. This extraction and repositioning of key elements removes them from zones of interference while maintaining device assembly feasibility.
Solution Approach 2:
The grounding electrode serves as an intermediary element that mediates between the antenna element and the housing structure. It provides a controlled path for electromagnetic energy, directing it away from interfering metal components while maintaining the structural integrity and assembly requirements of the device. The grounding system acts as a buffer that protects the resonant cavity from interference generated by other metal structures.
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 improves antenna efficiency and expands the operating frequency range by allowing resonance on a plane, reducing signal reflection, and avoiding interference from internal metal components.
Implementation Method 1
a system grounding surface configured to receive energy of the feeding signal and transmit a first electromagnetic wave signal via resonance
Implementation Method 2
a coupling unit disposed on a first surface of the electronic device and electronically coupled to the impedance matching unit, configured to radiate energy of the feeding signal
Data Source
AI summary
A wireless communication circuit and an electronic device are provided. The wireless communication circuit used for an electronic device includes a wireless transceiver unit used to generate a transmitting signal, an impedance matching unit electronically coupled to the wireless transceiver unit, a coupling unit and a system grounding surface. The impedance matching unit includes at least one impedance, the impedance matching unit is used to convert the transmitting signal to a feeding signal according to the impedance value of at least one impedance. The coupling unit is electronically coupled to the impedance matching unit, to radiate the energy of the feeding signal. The system grounding surface is used to transmit a first electromagnetic wave signal via resonance on the plane of the system grounding surface after receiving the energy of the feeding signal.