Vehicle Broadcast Antenna Gain Control for Cable Noise

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Solution Overview

Problem

Vehicle antenna systems face challenges in reducing distortion and noise due to external noise introduced through the connection cable between the antenna module and the radio tuner, which affects the ability of the second low noise amplifier to adjust the intermediate frequency signal effectively, leading to poor radio broadcast quality.

Innovation Solution

The antenna system incorporates a noise level detector to measure noise levels in the connection cable, and a second auto gain controller adjusts the gain of the second low noise amplifier based on both the intermediate frequency signal strength and noise level, thereby minimizing noise impact.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Power

If the second low noise amplifier adjusts the strength of the intermediate frequency signal, then the signal strength is improved, but noise from the connection cable increases

Engineering Contradiction:

Improvesignal strengthVSAvoidnoise

Core Design Contradiction:

PowerVSObject-affected harmful factors

Solution Approach 1:

A noise level detector measures the noise level introduced into the connection cable, and this measurement is fed back to a second automatic gain controller (AGC) that adjusts the gain of the second low noise amplifier based on both the strength of the intermediate frequency signal and the measured noise level, creating a closed-loop feedback system that dynamically optimizes signal amplification while minimizing noise amplification

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The system dynamically changes the gain parameter of the second low noise amplifier based on real-time measurements of signal strength and noise level, adjusting the amplification factor adaptively to maintain optimal signal-to-noise ratio under varying operating conditions

Inventive Principle:

Principle #35Parameter changes

2Power

If the gain of the second low noise amplifier is increased to improve signal strength, then signal reception is improved, but signal distortion increases

Engineering Contradiction:

Improvesignal strengthVSAvoidsignal distortion

Core Design Contradiction:

PowerVSManufacturing precision

Solution Approach 1:

The second AGC uses feedback from both signal strength measurements and noise level measurements to control the gain of the second low noise amplifier, preventing excessive amplification that would cause distortion while ensuring sufficient signal strength is maintained

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The gain of the second low noise amplifier is made dynamic rather than fixed, allowing the system to adapt the amplification level in real-time based on changing signal and noise conditions, thereby avoiding distortion during high signal conditions while maintaining adequate amplification during low signal conditions

Inventive Principle:

Principle #15Dynamics

Data Source

PatentUS20250211271A1Antenna system of vehicle for receiving broadcast signal, and operation method thereof

Publication Date: 2025.06.26 HYUNDAI MOTOR CO LTD

AI summary

An antenna system of a vehicle includes a first low noise amplifier (LNA) for adjusting a strength of a radio frequency (RF) signal received by an antenna element; a mixer for converting the adjusted RF signal received through a connection cable into an intermediate frequency (IF) signal; a second low noise amplifier for adjusting a strength of the IF signal; a noise level detector for measuring a noise level introduced into the connection cable; and a second auto gain controller (AGC) for controlling a gain of the second LNA based on the strength of the IF signal and the noise level.