PIFA Antenna Impedance Optimization via Lumped Elements
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Solution Overview
Problem
PIFA type antennas face challenges in securing radiation efficiency and performance due to limited effective volume, particularly in slimmed electronic devices where space for mounting is scarce.
Innovation Solution
The electronic device incorporates a PIFA type antenna with a radiation section, power feeding section, and ground section, along with a power feeding pad and ground pad, connected via a connection section that optimizes radiation performance without increasing the antenna's effective volume, utilizing a configuration that includes lumped elements and a control unit to manage signal flow and impedance matching.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the effective volume of the PIFA antenna is increased to improve radiation efficiency, then the radiation performance is improved, but the device size increases which is not acceptable in slimmed electronic devices
Solution Approach 1:
The patent changes the electrical parameters of the antenna system by introducing lumped elements (capacitors and inductors) that modify the impedance characteristics and resonant frequency of the PIFA antenna, enabling improved radiation efficiency within the same physical volume constraints
Solution Approach 2:
The patent introduces lumped elements as intermediary components between the feeding terminal and the ground terminal of the PIFA antenna. These intermediaries (capacitors and inductors) adjust the electrical properties of the antenna system to optimize radiation performance without requiring increased physical volume
2Length of moving object
If the PIFA antenna is made compact to fit in slimmed devices, then the device thickness is reduced, but the radiation performance deteriorates
Solution Approach 1:
The patent modifies the electrical parameters of the compact PIFA antenna by incorporating lumped elements that adjust the resonant frequency and impedance matching, thereby maintaining or improving radiation performance despite the reduced physical dimensions
Solution Approach 2:
The patent applies different electrical characteristics to different parts of the antenna system by placing specific lumped elements (capacitors at the feeding terminal, inductors at the ground terminal) to locally optimize the electrical properties and radiation performance of the compact antenna structure
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 configuration enhances radiation efficiency and performance across various frequency bands, as demonstrated by improved Standing Wave Ratio (SWR) and radiation efficiency measurements, without expanding the antenna's physical dimensions.
Implementation Method 1
a radiating element for radiating or receiving an RF signal
Implementation Method 2
at least one impedance element provided in a line connecting the first grounding terminal to the ground conductor
Data Source
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AI summary
Various exemplary embodiments of the present disclosure relate to an electronic device with a Planar Inverted-F Antenna (PIFA) type antenna and a wireless signal transmitting/receiving device of the electronic device. The electronic device may include: a PIFA (Planar Inverted-F Antenna) type antenna which is transmitting or receiving a wireless signal; a wireless communication unit which is processing the transmitted or received wireless signal; a printed circuit board which is mounted with the wireless communication unit and includes a ground area; a power feeding pad which is electrically connected with a signal transmitting/receiving terminal of the wireless communication unit, and connected with a power feeding section of the PIFA type antenna when the PIFA type antenna is equipped in the electronic device; a ground pad which is electrically connected with the ground area, and connected with a ground section of the PIFA type antenna when the PIFA type antenna is equipped in the electronic device; and a connection section which forms an electric route between the power feeding pad and the ground pad. Meanwhile, various exemplary embodiments may be made based on a technical idea of the present disclosure.