High Frequency Filter Blocking Circuit Coupling

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Solution Overview

Problem

Conventional high frequency filters, particularly duplex filters, face limitations in generating blocking poles due to the requirement for non-adjacent resonators, restricting filter topologies and the number of blocking poles that can be produced.

Innovation Solution

The implementation of electromagnetically coupled coaxial resonators with a preselectable and adjustable coupling impedance, combining capacitive and inductive coupling to create a blocking circuit coupling at a defined frequency, allowing for cross-coupling of adjacent resonators and generating multiple blocking points without mechanical restrictions.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If non-adjacent resonators are cross-coupled to generate blocking poles, then blocking attenuation is improved, but filter topology flexibility deteriorates due to mechanical restrictions

Engineering Contradiction:

Improveblocking attenuationVSAvoidfilter topology flexibility

Core Design Contradiction:

ReliabilityVSAdaptability or versatility

Solution Approach 1:

The patent inverts the conventional cross-coupling approach by coupling adjacent resonators instead of non-adjacent ones. This inversion allows blocking poles to be generated through adjacent resonator coupling with preselectable coupling impedance, eliminating mechanical topology restrictions while maintaining blocking attenuation performance.

Inventive Principle:

Principle #13The other way round (Inversion)

Solution Approach 2:

The patent introduces preselectable and adjustable coupling impedance as a key parameter that enables adjacent resonators to be cross-coupled effectively. By controlling the coupling impedance magnitude and phase, blocking poles can be generated at desired frequencies without requiring specific mechanical topologies or non-adjacent resonator arrangements.

Inventive Principle:

Principle #35Parameter changes

2Adaptability or versatility

If adjacent resonators are cross-coupled, then filter topology flexibility is improved, but blocking pole generation capability deteriorates due to coupling restrictions

Engineering Contradiction:

Improvefilter topology flexibilityVSAvoidblocking pole generation capability

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The patent overcomes the blocking pole generation limitation by introducing preselectable coupling impedance with adjustable magnitude and phase. This parameter control enables adjacent resonators to generate blocking poles effectively, maintaining reliability while utilizing flexible adjacent-coupling topologies.

Inventive Principle:

Principle #35Parameter changes

3Reliability

If conventional cross-coupling is used, then blocking attenuation is improved, but the number of blocking poles deteriorates due to limited resonator pairs

Engineering Contradiction:

Improveblocking attenuationVSAvoidnumber of blocking poles

Core Design Contradiction:

ReliabilityVSQuantity of substance

Solution Approach 1:

The patent inverts the conventional approach by using adjacent resonator coupling instead of non-adjacent coupling. This enables blocking poles to be generated between any adjacent resonator pairs in the filter chain, significantly increasing the total number of blocking poles that can be produced from the same number of resonators.

Inventive Principle:

Principle #13The other way round (Inversion)

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

This approach enables the generation of numerous blocking points, increasing the flexibility of filter topologies and allowing for more effective frequency blocking within the high frequency filter, while maintaining minimal attenuation of useful signals within the pass range.

Implementation Method 1

combining capacitive and inductive coupling to create a blocking circuit coupling

Methodology Applied

Scientific EffectCapacitive coupling: Capacitance

Implementation Method 2

combining capacitive and inductive coupling to create a blocking circuit coupling

Methodology Applied

Scientific EffectInductive coupling: Electromagnetic Induction

Implementation Method 3

em electromagnetically coupled coaxial resonators with a preselectable and adjustable coupling impedance

Methodology Applied

Scientific EffectElectromagnetic coupling: Resonance

Implementation Method 4

there is produced, based on the combination of capacitive and inductive coupling, a coupling impedance resonance at a defined blocking frequency

Methodology Applied

Scientific EffectCoupling impedance resonance: Resonance

Data Source

PatentUS7777593B2High frequency filter with blocking circuit coupling

Publication Date: 2010.08.17 TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)

AI summary

An improved high frequency filter displays the following features: the high frequency filter displays transmission behavior with a coupling impedance resonance having at least one blocking point at a frequency, the blocking point at the frequency being adjustable by presetting and/or preselecting a defined capacitive and inductive coupling between two coaxial resonators, one immediately following the other on a signal path.