Mobile Radio Antenna Module Layout for Low-PIM Multi-Band Signals
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Solution Overview
Problem
Mobile radio antennas face challenges with passive intermodulation products (PIM) and worsened signal-to-noise ratio (SNR) due to the integration of multiple frequency bands and components, leading to inefficiencies in signal transmission and reception.
Innovation Solution
A mobile radio antenna design featuring a carrier assembly with radiating elements, an integrated antenna array module, and a duplex filter assembly that minimizes PIM by ensuring almost unattenuated transmission and reception in specific bands while heavily attenuating interference, along with a phase shifter arrangement and low-noise amplifier placement within a common housing to reduce cable connections and power losses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple components are integrated in the antenna housing to support many frequency bands, then the antenna can provide different mobile radio standards, but passive intermodulation products arise and signal to noise ratio worsens
Solution Approach 1:
The antenna system is divided into separate functional modules: antenna elements, phase shifter arrangements, and duplex filter assemblies. Each module is housed in separate housing modules that can be independently arranged and connected, reducing passive intermodulation while maintaining multi-band support capability
Solution Approach 2:
The phase shifter arrangements and duplex filter assemblies are extracted from the main antenna housing and placed in separate housing modules. This separation removes the sources of passive intermodulation from proximity to the radiating elements, thereby improving signal to noise ratio while the modules remain connected to support multiple frequency bands
2Adaptability or versatility
If many plug connectors are used to integrate components, then different mobile radio standards can be supported, but system efficiency and signal to noise ratio are worsened
Solution Approach 1:
Multiple functional components (phase shifters, duplex filters, and their connections) are merged into integrated housing modules. This consolidation reduces the number of separate plug connectors and cable connections needed, thereby improving system efficiency and reducing signal loss while maintaining support for multiple mobile radio standards through the modular architecture
3Ease of operation
If transmit and receive signals are transferred across a common cable connection, then both signals can be transmitted, but passive intermodulation products arise and signal to noise ratio is worsened
Solution Approach 1:
The signal paths are segmented into separate transmit and receive channels through spatial separation. The duplex filter assemblies are positioned in separate housing modules from the antenna elements, with dedicated connection paths that minimize interaction between transmit and receive signals, reducing passive intermodulation while maintaining ease of connection through standardized interfaces
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 enhances the signal-to-noise ratio and system efficiency by minimizing PIM and power losses, allowing for improved electrical properties and reduced downtime for component replacements.
Implementation Method 1
A first duplex filter assembly (20a) is situated in the second receiving space (6b). The at least one partition (10) comprises a first opening (25a), wherein the common terminal (21) of the first duplex filter assembly (20a) is electrically or electromagnetically connected to the common terminal (12) of the first phase shifter arrangement (11a) through the first opening (25a).
Implementation Method 2
A first phase shifter arrangement (11a) is situated in the first receiving space (6a). This comprises a common terminal (12) and a plurality of antenna-side terminals (13). Each antenna-side terminal (13) of the phase shifter arrangement is electrically connected directly or indirectly to a first terminal of at least one radiating element (2).
Implementation Method 3
The plurality of radiating elements (2) are arranged at or on a first side of the carrier assembly (3) and are adapted to sending and receiving mobile radio signals in at least a first mobile radio band (A).
Implementation Method 4
There is furthermore provided at least a first low-noise amplifier (33a), which is arranged in the third receiving space (6c). The at least one further partition (32) comprises an opening (35), and the first low-noise amplifier (33a) is electrically connected through this opening (35) to the first duplex filter assembly (20a).
Data Source
AI summary
A mobile radio antenna for connection to at least one mobile base station. The mobile radio antenna comprises a plurality of radiating elements and an antenna array module, which comprises at least a first housing module. The first housing module comprises a first receiving space and a second receiving space, which are separated from each other by at least one partition. A first phase shifter arrangement is situated in the first receiving space. A first duplex filter assembly is situated in the second receiving space. The at least one partition comprises a first opening, wherein a common terminal of the first duplex filter assembly is electrically or electromagnetically connected to a common terminal of the first phase shifter arrangement through the first opening. Furthermore, an antenna-side terminal of the first phase shifter arrangement is electrically connected directly or indirectly to a first terminal of at least one radiating element.