Antenna Apparatus Using Bottom Radiating Slot for Reduced Clearance
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The design of mobile phone antennas faces challenges with 'dead grip' issues due to side slits affecting efficiency and limited clearance, especially with increasing requirements for multiple-input multiple-output (MIMO) antennas in 5G technology, which is difficult to cover with a single antenna and is exacerbated by the need for a larger screen size.
Innovation Solution
The antenna apparatus includes a medium- and high-band antenna with a coupling feeding manner and slot radiation, utilizing a metal middle and frame with strategically placed slits and a low-band antenna with a matching circuit to isolate interference, allowing for reduced clearance requirements and improved efficiency by using overlapping dipoles and a decoupling capacitor to manage interference between bands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If side slits are opened for T-antenna design, then antenna radiation capability is improved, but antenna efficiency decreases due to dead grip effect
Solution Approach 1:
The patent inverts the conventional T-antenna design by moving the radiation slots from the sides to the bottom of the device. Instead of opening side slits that cause dead grip issues, the radiating elements are positioned at the bottom where they can radiate effectively without being blocked by the user's hand, thus resolving the contradiction between radiation capability and efficiency
Solution Approach 2:
The patent transitions from a two-dimensional side-slot configuration to a three-dimensional bottom-radiation structure. By utilizing the bottom surface of the device as the radiation area and employing vertical dipole elements, the design creates a new spatial dimension for antenna operation that avoids the dead grip problem while maintaining or improving radiation performance
2Reliability
If T-antenna with long radiating element is used, then antenna radiation performance is improved, but clearance requirement increases
Solution Approach 1:
The patent employs vertical dipole elements that extend in the thickness direction of the device rather than requiring long horizontal radiating elements. This dimensional change allows the antenna to achieve adequate electrical length for good radiation performance while occupying minimal planar clearance area, directly resolving the contradiction between radiation performance and clearance requirements
Solution Approach 2:
The patent utilizes the thin metal frame structure at the bottom of the device to create an effective radiating element. By using the frame itself as part of the antenna structure and incorporating capacitive loading, the design achieves resonant operation with a physically short structure that provides the necessary electrical length for good radiation performance
3Adaptability or versatility
If multiple MIMO antennas are added for 5G coverage, then frequency band coverage is improved, but clearance requirement increases
Solution Approach 1:
The patent designs a multi-functional antenna system where the bottom radiating structure serves multiple frequency bands simultaneously. The dipole elements and frame structure are configured to support both low-band and medium-/high-band operations, as well as 5G frequencies, allowing a single compact structure to provide comprehensive coverage across multiple bands without requiring separate large antennas for each band
Solution Approach 2:
The patent implements a nested antenna configuration where multiple radiating elements and feeding structures are integrated within a compact bottom-frame region. The low-band antenna, medium-/high-band antenna, and 5G-capable elements are nested together in the same spatial footprint, allowing multiple functions to coexist in minimal clearance space
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 design reduces the antenna's clearance requirement, enhances efficiency by avoiding hand interference with side slits, and effectively covers multiple bands, including 5G frequencies, while maintaining high radiation efficiency across various bands.
Implementation Method 1
a coupling feeding manner and a slot radiation manner are used for the first medium- and high-band antenna
Implementation Method 2
the medium- and high-band antenna includes a first feed point, a first dipole antenna, and a radiating slot
Implementation Method 3
a low-band antenna with a matching circuit to isolate interference, allowing for reduced clearance requirements and improved efficiency
Data Source
Figure 1~2
Figure 3
Figure 4
AI summary
This application provides an antenna apparatus and a terminal device. The antenna apparatus includes a first medium- and high-band antenna, the terminal device includes a metal middle frame and a metal frame, a slot is opened on a side of the metal middle frame, and the first high-band antenna includes a first feed point (101), a first dipole antenna (102), and a radiating slot (103), where the radiating slot (103) is constituted by the metal middle frame and the metal frame, a first end of the radiating slot (103) is connected to the side slot of the metal middle frame and is grounded by using the metal middle frame, and an opening of a second end of the radiating slot is disposed at a bottom edge of the metal frame; where the first dipole antenna (102) is connected to the first feed point (101); and the first dipole antenna (102) is spaced from the radiating slot (103), and the first dipole antenna is orthogonal to the radiating slot. The antenna apparatus in the embodiments of this application helps reduce a requirement of an antenna for clearance.