Ridge Gap Waveguide Crossover for Millimeter-Wave Transmission

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Solution Overview

Problem

Existing millimeter-wave crossover bridge structures face challenges such as high insertion loss, poor transmission effects, and manufacturing difficulties due to their complexity and component density.

Innovation Solution

A ridge gap waveguide millimeter-wave crossover bridge structure device is designed with an upper and bottom planar metal plate, a ridge waveguide with air gap, and metal pins forming a wave stop-band, along with impedance transformation structures and crisscross transmission lines to reduce leakage and improve transmission efficiency.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Loss of energy

If microstrip line technology is used for crossover bridge structure, then signal distribution and selection can be achieved, but insertion loss is excessive and transmission effect is poor

Engineering Contradiction:

Improveinsertion lossVSAvoidtransmission effect

Core Design Contradiction:

Loss of energyVSReliability

Solution Approach 1:

The patent replaces traditional microstrip line technology with ridge gap waveguide technology. This substitution fundamentally changes the transmission mechanism from surface wave propagation in microstrip lines to waveguide propagation with metallic ridges, resulting in reduced insertion loss and improved transmission effect while maintaining signal distribution and selection capabilities.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent introduces metallic ridges with specific dimensions (ridge width, ridge height) and controlled air gaps between plates to optimize waveguide parameters. By adjusting these geometric parameters, the transmission characteristics are improved, achieving lower insertion loss and better transmission effect compared to conventional microstrip structures.

Inventive Principle:

Principle #35Parameter changes

2Reliability

If crossover bridge structure complexity increases to achieve high transmission and high isolation, then signal distribution performance improves, but manufacturing difficulty increases

Engineering Contradiction:

Improvetransmission and isolation performanceVSAvoidmanufacturing difficulty

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The crossover bridge structure is divided into distinct functional segments: input ports, ridge waveguide sections, isolation structures with metallic ridges, and output ports. This segmentation allows each component to be optimized independently while simplifying the overall manufacturing process, as each segment can be fabricated and assembled separately.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent transitions from planar microstrip structures to three-dimensional ridge gap waveguide structures with air gaps between upper and bottom plates. This dimensional change enables high transmission and isolation performance through spatial separation of signal paths, while the modular 3D structure actually simplifies manufacturing compared to complex planar configurations.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

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

The solution reduces electromagnetic wave leakage, enhances transmission effects, and decreases insertion loss, achieving high isolation and return loss while simplifying the manufacturing process.

Implementation Method 1

a ridge waveguide (4) fixed on the surface of the bottom planar metal plate (2) facing the upper planar metal plate (1) with an air gap between the upper planar metal plate (1) and the ridge waveguide (4)

Methodology Applied

Scientific EffectElectromagnetic wave propagation: Waveguide

Implementation Method 2

A plurality of metal pins (5) are fixed on the surface of the bottom planar metal plate (2) facing the upper planar metal plate (1) with an air gap between the upper planar metal plate (1) and the metal pins (5), and are evenly arranged around the edges of the ridge waveguide (4) to form a wave stop-band

Methodology Applied

Scientific EffectWave stop-band formation: Electromagnetic Induction

Implementation Method 3

The ridge waveguide (4) includes two transmission lines (41) arranged crosswise and four impedance transformation structures (42) respectively connected to the ends of the two transmission lines (41)

Methodology Applied

Scientific EffectImpedance transformation: Electromagnetic Induction

Data Source

PatentUS11670830B2Ridge gap waveguide crossover structure including intersecting transmission lines with impedance transformers disposed between upper and bottom planar metal plates and having a gap therein

Publication Date: 2023.06.06 BEIJING UNIV OF POSTS & TELECOMM

AI summary

A ridge gap waveguide millimeter-wave crossover bridge structure device includes: an upper planar metal plate and a bottom planar metal plate arranged in parallel; a supporting structure fixedly arranged between the two planar metal plates; a ridge waveguide fixed on the upper surface of the bottom planar metal plate, with an air gap between the upper planar metal plate and the ridge waveguide; and a plurality of metal pins fixed on the upper surface of the bottom planar metal plate and evenly arranged around the ridge waveguide. The ridge waveguide includes two transmission lines arranged crosswise and four impedance transformation structures respectively connected to the ends of the two transmission lines. The distal end of each of the impedance transformation structures away from the connected transmission line is used to connect with external test equipment to be accommodated in four input ports in the bottom planar metal plate.