FM Broadcast Antenna with Multi-Diameter Feed Line

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Current FM broadcast antennas require multiple antennas to cover the entire 20 MHz bandwidth, and they often have a high Voltage Standing Wave Ratio (VSWR), which limits their efficiency in power delivery.

Innovation Solution

A single FM broadcast antenna design featuring a mast with forward- and rear-facing elements at specific angles, a multi-diameter transmission line, and a center pin with varying diameters, configured to provide a broadband response and maintain a low VSWR across the 20 MHz bandwidth.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If a single antenna is used to cover the entire 20 MHz FM bandwidth, then the bandwidth coverage is improved, but the VSWR performance deteriorates

Engineering Contradiction:

Improvebandwidth coverageVSAvoidVSWR

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The antenna is divided into multiple discrete elements (first pair of elements and second pair of elements) with different geometries and orientations. Each element is optimized for specific frequency ranges within the 20 MHz bandwidth, allowing the composite antenna structure to achieve broad bandwidth coverage while maintaining low VSWR across the entire FM band through coordinated operation of the segmented elements.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different elements of the antenna are designed with locally optimized properties - the first pair of elements has specific lengths and orientations optimized for certain frequency ranges, while the second pair has different dimensions and angles optimized for other frequency ranges. This local quality differentiation allows each element to contribute optimally to the overall bandwidth coverage while maintaining impedance matching and low VSWR.

Inventive Principle:

Principle #3Local quality

2Reliability

If multiple antennas are used to cover the 20 MHz bandwidth, then the VSWR is maintained, but the device complexity increases

Engineering Contradiction:

ImproveVSWRVSAvoidantenna structure

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

Multiple antenna elements that would traditionally require separate antenna structures are merged into a single integrated antenna assembly. The first pair of elements and second pair of elements are coupled to the same mast structure and operate cooperatively, achieving the bandwidth coverage of multiple antennas while maintaining a unified structure with consistent VSWR performance across the 20 MHz band.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The single antenna structure is designed to perform multiple functions simultaneously - it provides broad bandwidth coverage across the entire 20 MHz FM band while maintaining low VSWR, eliminating the need for multiple specialized antennas. The multi-element design enables this universal performance through the coordinated radiation patterns and impedance characteristics of all elements.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Data Source

PatentUS11349214B2FM broadcast antenna

Publication Date: 2022.05.31 NICOMUSA INC

AI summary

An FM broadcasting antenna is described having a mast, a pair of forward-facing elements, and a pair of rear-facing elements. The antenna makes use of angles between the antenna elements and the mast, a multi-diameter feed line, a multi-diameter center pin, and mounting points of a strap extending between at least one of the forward-facing elements, at least one of the rear-facing elements and the center pin, for achieving desired broadband and performance characteristics.