The installation location of the antenna filter varies depending on the application scenario and design requirements. According to the information I searched, the following typical installation methods can be summarized:
Roof antenna system:
In the vehicle, the antenna filter is usually installed on the bottom of the roof lining. For example,
The antenna filter is connected to the bottom of the roof lining and fixed by fasteners. The radio antenna interference filter is also directly installed between the roof antenna module and the cable group.
Communication base station:
In the communication base station, the filter is usually installed at the antenna feed's output or the low-noise amplifier's input. For example, it is pointed out that the filter should be installed at the input of the satellite earth station's low noise amplifier or low noise converter to reduce interference.
Indoor equipment:
In some indoor environments, the filter may be installed inside the equipment. For example,
An indoor-mounted LTE rejection filter (FLTE-481) is shown to reduce indoor signal interference.
Car FM antenna system:
In the car FM antenna system, the filter may be used as part of the heating structure to control the signal path and prevent interference. For example,
The filter components in the FM antenna structure are described.
Portable devices:
In portable devices, filters may be built into the antenna design to save space and improve performance. For example, an antenna design with a built-in filter is mentioned, where the filter electrode is integrated directly onto the circuit board.
Installation in special scenarios:
In some special scenarios, the filter may be installed on the back of the antenna or in a specific structure. For example,
It is mentioned that in a satellite antenna system, the filter is located on the back of the antenna.
Integrated unit design:
To simplify installation and improve efficiency, some designs integrate the filter with the antenna feed unit. For example, a design of an integrated unit for a polymer composite filter antenna is described.
Other scenarios:
In some specific applications, the filter may be installed inside or outside the metal chassis of the device. For example, it is mentioned that the filter should be reliably bonded to the metal chassis and ensure good grounding.
The installation location of the antenna filter depends on the specific application scenario and design requirements. Common installation locations include the roof, inside the device, on the back of the antenna, communication base station, etc. In addition, modern design trends tend to integrate the filter with the antenna to simplify installation and improve performance.
Reference:
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