Suppression of Harmonics in Microstrip Filters Using a Combination of Techniques

Frederick Huang

doi:10.1109/TMTT.2015.2461616

Suppression of Harmonics in Microstrip Filters Using a Combination of Techniques

Frederick Huang

Electronic, Electrical and Systems Engineering

Research output: Contribution to journal › Article › peer-review

13 Citations (Scopus)

940 Downloads (Pure)

Abstract

Existing and newly-adapted techniques for suppressing harmonic responses in microstrip filters were combined. Stagger tuning using additional stubs to shift the resonances has been adapted to quarter-wave resonators and extended to the 7th order spurious response. Suitable resonator overlap provided transmission zeroes to cancel spurious peaks. Coupling capacitor pads acting as shorting stubs have been developed. Spurious responses were suppressed to better than -33 dB, up to 6.3 GHz, in a measured filter with 1 GHz center frequency and 42% bandwidth. Suitably placed resistors have depressed the spurious level further to -50 dB up to 5.6 GHz, with only 0.07 dB extra pass band loss.

Original language	English
Pages (from-to)	3453-3461
Number of pages	9
Journal	IEEE Transactions on Microwave Theory and Techniques
Volume	63
Issue number	10
Early online date	12 Aug 2015
DOIs	https://doi.org/10.1109/TMTT.2015.2461616
Publication status	Published - Oct 2015

Keywords

harmonic suppression
microstrip filters
resistive attenuation
resonator overlap
spurious response suppression
stubs

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10.1109/TMTT.2015.2461616

Huang_Suppression_Harmonics_Microstrip_Filters_2015
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Cite this

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abstract = "Existing and newly-adapted techniques for suppressing harmonic responses in microstrip filters were combined. Stagger tuning using additional stubs to shift the resonances has been adapted to quarter-wave resonators and extended to the 7th order spurious response. Suitable resonator overlap provided transmission zeroes to cancel spurious peaks. Coupling capacitor pads acting as shorting stubs have been developed. Spurious responses were suppressed to better than -33 dB, up to 6.3 GHz, in a measured filter with 1 GHz center frequency and 42% bandwidth. Suitably placed resistors have depressed the spurious level further to -50 dB up to 5.6 GHz, with only 0.07 dB extra pass band loss.",

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AB - Existing and newly-adapted techniques for suppressing harmonic responses in microstrip filters were combined. Stagger tuning using additional stubs to shift the resonances has been adapted to quarter-wave resonators and extended to the 7th order spurious response. Suitable resonator overlap provided transmission zeroes to cancel spurious peaks. Coupling capacitor pads acting as shorting stubs have been developed. Spurious responses were suppressed to better than -33 dB, up to 6.3 GHz, in a measured filter with 1 GHz center frequency and 42% bandwidth. Suitably placed resistors have depressed the spurious level further to -50 dB up to 5.6 GHz, with only 0.07 dB extra pass band loss.

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KW - microstrip filters

KW - resistive attenuation

KW - resonator overlap

KW - spurious response suppression

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DO - 10.1109/TMTT.2015.2461616

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JF - IEEE Transactions on Microwave Theory and Techniques

IS - 10

ER -

Suppression of Harmonics in Microstrip Filters Using a Combination of Techniques

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