Low-Profile Multi-Band Vehicle Antenna With Shared Cable Layout
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Solution Overview
Problem
Existing multi-band antennas are large in size due to the integration of antenna circuits for different frequency bands.
Innovation Solution
A multi-band low profile antenna design that integrates antenna circuits using a single connection cable to transmit signals across different frequency bands, including VHF, 700 MHz to 800 MHz, and UHF, with optimized cable lengths and a ground plane for size reduction and improved performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If antenna circuits for different frequency bands are integrated separately, then multi-band communication capability is achieved, but the antenna device size becomes large
Solution Approach 1:
The patent combines multiple antenna circuits (VHF, 700-800 MHz, and UHF bands) into a single integrated antenna device with a unified ground plane and shared structural components. The connection cables for different frequency bands are integrated within the same housing structure, merging what would traditionally be separate antenna units into one compact device.
Solution Approach 2:
The ground plane is designed to serve multiple frequency bands simultaneously, acting as a universal reference plane for VHF, 700-800 MHz, and UHF antenna circuits. The housing structure provides universal support and shielding for all antenna elements, eliminating the need for separate structural components for each frequency band.
2Reliability
If connection cable length is optimized for each frequency band, then signal transmission performance is improved, but the overall device complexity increases
Solution Approach 1:
The connection cables are designed with different optimized lengths tailored to each specific frequency band's requirements. The VHF cable, 700-800 MHz cable, and UHF cable each have locally optimized characteristics (length, impedance) matched to their respective frequency bands, allowing each antenna circuit to achieve optimal signal transmission without compromising the others.
Data Source
AI summary
A multi-band low profile antenna and a vehicle-mounted antenna are provided. The multi-band low profile antenna includes a base board, a circuit board vertically disposed on the base board, a first antenna circuit disposed on the circuit board, a second antenna circuit disposed on the circuit board, a third antenna circuit disposed on the circuit board, a connection cable disposed between the first antenna circuit and the second antenna circuit, and a main cable electrically connected to the first terminal of the connection cable. For the vehicle-mounted antenna includes the multi-band low profile antenna, the base board has an opening, and the main cable has a first part passing through the opening of the base board, and a second part extending against a top surface of the base board, and the base board is adaptive for a roof of a vehicle.