Capacitive Reflector Frame for Mobile Radio Base Station Antennas
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Solution Overview
Problem
Conventional antenna arrangements for mobile radio base stations face challenges in beam shaping and intermodulation issues when using printed circuit boards with electrically conductive ground planes, requiring laborious assembly and potential sources of disruption.
Innovation Solution
A capacitive reflector frame is used, which is either conductive or non-conductive with a metallic coating, coupled to a printed circuit board without a galvanic connection, allowing for the construction of longitudinal and transverse webs on a coupling surface parallel to the ground plane, enabling beam shaping without intermodulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a printed circuit board with electrically conductive ground plane is used for the reflector, then manufacturing precision and ease of manufacture are improved, but intermodulation issues and reliability deteriorate
Solution Approach 1:
The patent introduces an insulating layer as an intermediary between the printed circuit board ground plane and the reflector frame. This mediator allows the reflector to be positioned accurately (improving manufacturing precision) while electrically isolating it from the ground plane (eliminating intermodulation issues and improving reliability). The insulating layer acts as a buffer that maintains both electrical and mechanical relationships without direct contact.
2Reliability
If galvanic connection (soldered joints) is used between reflector and printed circuit board, then electrical connection reliability is improved, but assembly complexity and time increase
Solution Approach 1:
The patent extracts the electrical connection function from the mechanical assembly process. By using capacitive coupling through an insulating layer, the electrical connection is established without requiring soldered joints or galvanic contact. This separates the electrical connection requirement from the time-consuming assembly operations, maintaining reliability while dramatically reducing assembly time and complexity.
3Ease of manufacture
If capacitive coupling is used between reflector and printed circuit board, then assembly ease and time are improved, but coupling stability and defined connection may deteriorate
Solution Approach 1:
The patent carefully controls the parameters of the capacitive coupling system, specifically the distance and alignment between the ground plane and reflector through the insulating layer. By optimizing these parameters, the coupling stability is maintained despite the non-galvanic connection. The insulating layer's thickness and material properties are selected to ensure reliable capacitive coupling while allowing easy assembly.
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 solution allows for easy and accurate production of antennas with predetermined radiation properties, avoiding intermodulation sources and simplifying assembly by eliminating the need for soldered joints, while ensuring a stable and defined coupling between the reflector frame and the printed circuit board.
Implementation Method 1
The reflector frame 11 is coupled to a printed circuit board 5 without a galvanic connection... A capacitive reflector frame coupling is proposed... ensuring a stable and defined coupling between the reflector frame and the printed circuit board
Data Source
AI summary
An improved antenna arrangement includes a reflector arrangement comprising a printed circuit board with an electrically conductive ground plane. The reflector arrangement also has a reflector frame with a coupling surface. The coupling surface is capacitively coupled to the ground plane. The coupling surface has a recess via which the ground plane, which is located underneath it, and/or the printed circuit board or an isolating intermediate layer which is provided above the ground plane or an isolating intermediate layer which is provided above the printed circuit board is exposed. The at least one antenna element arrangement is positioned and/or held on the printed circuit board in the area of the recess.