Multiband Antenna Feeding Matching via Frequency-Selective Ground Branches
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Solution Overview
Problem
Conventional LTE antenna designs face challenges in achieving a balance between bandwidth and efficiency across both low and high frequency bands, with existing solutions either compromising the low frequency band's bandwidth and efficiency or introducing insertion loss due to switch impedance effects.
Innovation Solution
A feeding matching apparatus for a multiband antenna that utilizes ground cable branches of different lengths connected in series with signal filtering components, such as high-pass or band-pass filters, to selectively allow or block signals based on frequency, ensuring better matching and efficiency across multiple frequency bands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a switch is introduced to enable operation in different frequency bands, then multi-band operation is achieved, but insertion loss occurs due to switch impedance effects
Solution Approach 1:
The system dynamically adapts to different frequency bands through passive electromagnetic coupling rather than active switching. The parasitic element automatically resonates at different frequencies by adjusting its electrical characteristics in response to the operating frequency, eliminating the need for mechanical or electronic switches that cause insertion loss
Solution Approach 2:
A parasitic element acts as an intermediary between the feeding element and ground, providing frequency-selective coupling through electromagnetic induction. This passive intermediary enables frequency band switching without direct electrical connection changes, avoiding the impedance effects and insertion loss associated with traditional switches
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 enhances bandwidth and efficiency for both low and high frequency bands, allowing the antenna to meet the requirements of modern LTE technology, particularly in handheld devices, by optimizing signal transmission and reception through appropriate matching of ground cable lengths and filtering components.
Implementation Method 1
at least one ground cable branch is connected in series to a signal filtering component, and the signal filtering component is capable of preventing a signal lower than a frequency point corresponding to the signal filtering component from passing through it
Data Source
AI summary
The present disclosure relates to the field of antenna technologies and discloses a feeding matching apparatus of a multiband antenna, a multiband antenna, and a radio communication device to improve a bandwidth and efficiency of a lower frequency band. The feeding matching apparatus of a multiband antenna includes: a grounding portion; a feeding portion connected to a signal source, where a signal of the signal source is input into the feeding portion; and two or more ground cable branches with different lengths, where one end of each ground cable branch is electrically connected to the feeding portion, the other end is electrically connected to the grounding portion, at least one ground cable branch is connected in series to a signal filtering component, and the signal filtering component is capable of preventing a signal lower than a frequency point corresponding to the signal filtering component from passing through it.