Frequency-Selective Splitter Using Microstrip Lengths

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Solution Overview

Problem

Conventional splitters fail to achieve low isolation within certain frequency bands and high isolation at other frequencies, making them unsuitable for applications requiring specific signal conductivity and isolation characteristics.

Innovation Solution

The splitter design incorporates transmitting units with microstrips of varying lengths, where each length is related to a specific frequency, allowing output terminals to be conductive within certain frequency bands and isolated at others by generating a cutoff effect.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If conventional splitter design is used, then high isolation between output terminals is achieved, but the ability to provide low isolation within certain frequency bands is lost

Engineering Contradiction:

Improvefrequency-selective isolation capabilityVSAvoidisolation between output terminals

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The splitter is divided into multiple transmitting units, each responsible for specific frequency bands. Each transmitting unit contains microstrips with lengths corresponding to specific frequencies, allowing the system to selectively control isolation for different frequency ranges independently

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The isolation characteristic between output terminals is made dynamic and frequency-dependent rather than static. By using microstrips with different lengths (L1, L2, L3, L4) corresponding to different frequencies (f1, f2, f3, f4), the splitter dynamically adjusts isolation levels based on the input signal frequency

Inventive Principle:

Principle #15Dynamics

2Adaptability or versatility

If microstrips of varying lengths are used to achieve frequency-selective conductivity, then adaptability to different frequency bands is improved, but device complexity increases

Engineering Contradiction:

Improvefrequency band selectivityVSAvoidnumber of microstrips and resistors

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

Multiple transmitting units are merged into a single integrated splitter circuit. The microstrips from different transmitting units share common nodes and resistors, allowing frequency-selective functionality to be achieved without proportionally increasing the number of discrete components

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

Each transmitting unit serves multiple functions: it provides signal transmission paths, establishes isolation for specific frequency bands, and creates conductivity in complementary frequency bands. The resistors serve dual purposes of impedance matching and isolation control

Inventive Principle:

Principle #6Universality (Multi-functionality)

Data Source

PatentUS8937517B2Splitter

Publication Date: 2015.01.20 WISTRON NEWEB CORP

AI summary

A splitter includes an input terminal, a first output terminal, a second output terminal, a first transmitting unit including a first microstrip coupled between the input terminal and a first node, a second microstrip coupled between the input terminal and a second node, and a first resistor coupled between the first node and the second node, and a second transmitting unit including a third microstrip coupled between the first node and the first output terminal, a fourth microstrip coupled between the second node and the second output terminal, and a second resistor coupled between the first output terminal and the second output terminal, wherein lengths of the first microstrip and the second microstrip are related to a first frequency, and lengths of the third microstrip and the fourth microstrip are related to a second frequency.