Adjustable Monopole Antenna for Wideband Frequency Shift
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Solution Overview
Problem
Existing adjustable antennas in small-sized radio devices face challenges in covering multiple frequency ranges due to limited space, particularly in the lower operating band, which affects radio connection quality and efficiency.
Innovation Solution
The antenna employs a switch and alternative reactive elements connected to the ground, with an adjusting point located halfway along the radiator conductor, allowing for a wider range of operating band shifts without increasing space requirements, using a monopole type radiator with slots and a parasitic element for efficient frequency adjustment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the antenna size is reduced to fit small-sized radio devices, then the device size is reduced, but the antenna bandwidth becomes narrow and cannot cover multiple frequency ranges
Solution Approach 1:
The patent implements an adjustable antenna system where the resonance frequency can be dynamically changed using a switch and reactive elements. This allows the antenna to adapt its electrical characteristics to cover different frequency ranges (GSM850, GSM900, LTE) without changing physical size, resolving the contradiction between compact device size and multi-frequency coverage capability
Solution Approach 2:
The patent changes the electrical parameters of the antenna by introducing switchable reactive elements (capacitors and inductors) that modify the resonance frequency. By adjusting these electrical parameters, the antenna maintains its physical dimensions while achieving variable frequency coverage across multiple radio systems
2Adaptability or versatility
If a switch and reactive elements are added to adjust the antenna resonance frequency, then the frequency range coverage is improved, but the device complexity increases
Solution Approach 1:
The patent combines the antenna adjusting circuit with the existing radio device circuit board, integrating the switch and reactive elements into the available space without requiring separate dedicated components. This merging approach achieves frequency adjustment functionality while minimizing the increase in overall device complexity
3Adaptability or versatility
If the lower operating band is widened to cover GSM850 and GSM900 together, then the frequency range coverage is improved, but the space required for the antenna increases
Solution Approach 1:
The patent uses an adjustable resonance frequency mechanism to dynamically expand the lower operating band coverage to include both GSM850 (824-894 MHz) and GSM900 (935-960 MHz) frequency ranges. This dynamic adjustment allows wide frequency coverage without requiring additional physical antenna space, as the electrical characteristics are modified rather than the physical dimensions
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 a wider range of operating band shifts, improving radio connection quality and reducing space requirements within the device, while maintaining efficient antenna performance.
Implementation Method 1
about halfway along its radiator conductor, there is an adjusting point, from which a conductor is branched to the adjusting circuit of the antenna. The adjusting circuit comprises a switch and alternative reactive elements connected to the ground, selectable by the switch. When a reactive element is changed, the electric length and resonance frequency of the radiator change
Data Source
AI summary
An adjustable monopole antenna apparatus and methods. In one embodiment, the antenna apparatus is intended for mobile terminals. In an exemplary implementation, there is an adjusting point is provided from which a conductor is branched to an adjusting circuit. The adjusting circuit comprises a switch and alternative reactive elements connected to ground, selectable by the switch. When a reactive element is changed, the electric length and resonance frequency of the radiator change, and the corresponding operating band shifts. If the antenna is configured as a dual-band antenna, the above-mentioned operating band is the lower band. One or more higher operating bands are based e.g. on radiating slots implemented by the same radiator conductor. The operating band of the exemplary embodiment of the antenna below the frequency 1 GHz can be shifted in a wider range than in the corresponding known antennas.