Mobile Terminal Antenna Layout for Switch-Free Multi-Band Coverage
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Solution Overview
Problem
Existing mobile phone antenna solutions face challenges in achieving multi-band range coverage without adding a switch device, which introduces switch insertion loss and increases antenna clearance, and fail to resolve performance issues in devices with large screen-to-body ratios.
Innovation Solution
An antenna apparatus with specific radiation section designs, including a first and second radiation section positioned near the corners of a mobile terminal, and an adjustable matching circuit at the third ground end, allowing for simultaneous coverage of multiple frequency bands without a tuning switch.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If antenna tuning switches are used to perform aperture tuning or impedance tuning to cover more frequency bands, then frequency band coverage is improved, but switch insertion loss is introduced and switch devices are likely damaged
Solution Approach 1:
The patent removes the antenna tuning switch from the antenna system entirely. The radiator structure itself is designed to inherently support multiple frequency bands (low-frequency band from 699-960 MHz and high-frequency band from 1710-2690 MHz) through its geometric configuration and grounding arrangements, eliminating the need for external switching components for frequency modulation.
Solution Approach 2:
The radiator is designed as a multi-functional structure that can operate across multiple frequency bands simultaneously or selectively. By configuring the radiator with specific lengths, grounding points, and impedance transformation circuits, a single radiator structure achieves what previously required multiple switched components, making the system universally applicable to different frequency bands without additional switching hardware.
2Adaptability or versatility
If antenna tuning switches are used to perform aperture tuning or impedance tuning to cover more frequency bands, then frequency band coverage is improved, but switch device size increases antenna clearance
Solution Approach 1:
The patent removes the antenna tuning switch from the antenna system entirely. The radiator structure itself is designed to inherently support multiple frequency bands (low-frequency band from 699-960 MHz and high-frequency band from 1710-2690 MHz) through its geometric configuration and grounding arrangements, eliminating the need for external switching components for frequency modulation.
Solution Approach 2:
The patent changes the design approach from using external switching components to modifying the intrinsic parameters of the radiator structure. By adjusting the radiator length, grounding point positions, and impedance transformation circuit parameters, the antenna achieves multi-band operation through parameter optimization of the radiator itself rather than adding external switching hardware.
3Reliability
If the quantity of tuning switches is increased to resolve antenna performance problems in devices with large screen-to-body ratio, then antenna performance is improved, but device complexity and antenna clearance increase
Solution Approach 1:
The radiator is designed as a multi-functional structure that can operate across multiple frequency bands simultaneously or selectively. By configuring the radiator with specific lengths, grounding points, and impedance transformation circuits, a single radiator structure achieves what previously required multiple switched components, making the system universally applicable to different frequency bands without additional switching hardware.
Solution Approach 2:
The patent combines multiple functions (low-frequency operation, high-frequency operation, impedance matching, and grounding) into a single integrated radiator structure. The radiator and its grounding system work together as a unified multi-functional unit that eliminates the need for separate tuning switches, thereby reducing device complexity while maintaining antenna performance.
Data Source
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Figure 3
Figure 4A~4B
AI summary
An antenna apparatus includes a radiator, a first grounding branch, and a second grounding branch. The radiator includes a feed point, a first radiation section, and a second radiation section. The first radiation section and the second radiation section are disposed on two sides of the feed point. A first gap and a second gap are respectively disposed between the first radiation section, the second radiation section, and the feed point. A first ground end is disposed at one end that is of the first radiation section and that is away from the first gap, and a second ground end is disposed at one end that is of the second radiation section and that is away from the second gap. the first grounding branch includes a third ground end and a first connection end, where the first connection end is located at an intersection position between the first grounding branch and the first radiation section, and a matching circuit is connected in series between the first connection end and the first ground end; the second grounding branch includes a fourth ground end and a second connection end, where the second connection end is located at an intersection position between the second grounding branch and the second radiation section, and a first high-frequency filter is connected in series between the second connection end and the second ground end. In this application, low frequency double resonance can be implemented without a need of a tuning switch.