UWB Antenna Matching Network for Wideband Compact Devices
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Solution Overview
Problem
There is a challenge in designing compact electronic devices with wireless communications capabilities to cover multiple communications bands while ensuring antenna performance across a range of frequencies and minimizing space, as antennas can interfere with each other and device components.
Innovation Solution
The design incorporates a housing with a dielectric cover layer, a conductive plate, and a mid-chassis, featuring an ultra-wideband antenna with a conductive patch resonating element and impedance matching structures, including open and grounded transmission line stubs and a phase-shifting segment, to maintain efficient bandwidth and adapt to variations in the air gap height.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If antennas are incorporated into compact electronic devices to cover multiple communications bands, then wireless communication capability is improved, but antenna interference with each other and device components increases
Solution Approach 1:
The patent utilizes the air gap dimension between the antenna and dielectric cover layer to improve antenna performance. By controlling the height of the air gap (0.5mm to 2mm), the antenna achieves wide bandwidth operation across multiple frequency bands while maintaining compact form factor, resolving the contradiction between compact size and communication capability
Solution Approach 2:
The patent applies localized impedance matching structures (open stub, grounded stub, and phase-shifting segment) at specific positions along the transmission line to optimize antenna performance in the UWB frequency range. These localized modifications enable wide bandwidth operation without affecting other parts of the device structure
2Adaptability or versatility
If antenna structures are designed to cover a range of operating frequencies, then multi-band coverage is improved, but device space requirements increase
Solution Approach 1:
The patent combines multiple antenna elements and impedance matching structures into a single integrated substrate assembly. The first substrate integrates the antenna resonating element, transmission line, open stub, grounded stub, and phase-shifting segment, allowing multi-band frequency coverage within a compact footprint that minimizes device space
Solution Approach 2:
The antenna structure is nested within the device housing layers, with the first substrate containing the antenna elements and impedance matching structures, mounted on a second substrate, which is then mounted to the mid-chassis. This nested arrangement accommodates multi-band frequency coverage requirements within the existing device form factor
3Reliability
If impedance matching structures are added to achieve wide bandwidth in UWB frequency band, then antenna performance is improved, but device complexity increases
Solution Approach 1:
The impedance matching network is segmented into three distinct functional components: an open transmission line stub for capacitive matching, a grounded transmission line stub for inductive matching, and a phase-shifting segment for impedance transformation. This segmentation allows each component to be independently optimized for wide bandwidth UWB performance while maintaining a systematic and manageable 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 enables the electronic device to achieve wide bandwidth and efficient antenna performance across ultra-wideband frequencies, optimizing communication efficiency while minimizing space and avoiding interference.
Implementation Method 1
The antenna may include an antenna resonating element formed from a conductive patch on the first substrate
Implementation Method 2
The signal conductor may include impedance matching structures for the antenna. The impedance matching structures may include an open transmission line stub, a grounded transmission line stub, and a phase shifting segment coupled between the open transmission line stub and the grounded transmission line stub
Data Source
AI summary
An electronic device may be provided with an antenna resonating element on a first substrate that is mounted to a second substrate. A signal conductor may be coupled to a feed terminal on the antenna resonating element. The signal conductor may include impedance matching structures for the antenna. The impedance matching structures may include an open transmission line stub, a grounded transmission line stub, and a phase shifting segment. The impedance matching structures may configure the antenna to exhibit a wide bandwidth in an ultra-wideband (UWB) frequency band. If desired, the signal conductor may have a phase-shifting segment configured to match a non-50 Ohm impedance of a radio-frequency front end coupled to the signal conductor.