Dear Quectel Technical Support Team,
Greetings,
I would like to submit a technical inquiry regarding the antenna architecture of the Quectel RM520 module and would appreciate clarification from your engineering team.
I am specifically trying to understand how the external cellular antenna ports are implemented internally and whether there is any distinction between primary and auxiliary RF paths.
Please clarify the following points:
- Primary / Auxiliary Antenna Architecture
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Does the RM520 implement dedicated Primary (Main) and Auxiliary (Aux) antenna ports?
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If yes, which antenna connectors are considered Main and which are Auxiliary?
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Are all antenna ports capable of both transmission and reception (Tx/Rx), or are some receive-only (Rx Diversity)?
- Frequency Support per Antenna Port
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What frequency ranges are supported by each individual antenna port?
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Do all antenna ports support the full cellular spectrum equally (Low-band / Mid-band / Sub-6 GHz), or does each port have a dedicated band allocation?
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Are there limitations on specific ports for certain LTE or NR bands?
- MIMO and Performance Behavior
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Is connecting antennas to all available ports required to achieve full MIMO performance?
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What is the expected impact when operating with only two connected antennas instead of the full antenna configuration?
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Does antenna selection affect Carrier Aggregation (CA) and 5G NSA / SA operation?
- External Antenna Recommendations
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Are there recommended specifications for external antennas (Gain, VSWR, Isolation, Polarization)?
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Is there an optimal antenna arrangement for maximizing throughput and signal quality?
My objective is to better understand the RF design and ensure proper external antenna deployment for maximum performance.
Thank you for your support, and I look forward to your technical clarification.
Best regards,
Mohammed Aoun
Telecommunications Engineer
LTT Company