Suppression of harmonics in Wilkinson power divider using dual-band rejection by asymmetric DGS

In this paper, we present an effective technique of second and third harmonic suppression for a Wilkinson power divider by using an asymmetric spiral defected ground structure (DGS). With the proposed technique, a single asymmetric DGS provides two different resonance frequencies because of the diff...

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Bibliographic Details
Published in:IEEE transactions on microwave theory and techniques 2005-06, Vol.53 (6), p.2139-2144
Main Authors: WOO, Duk-Jae, LEE, Taek-Kyung
Format: Article
Language:English
Subjects:
Applied sciences
Asymmetric spiral defected ground structure (DGS)
Asymmetry
Circuit properties
Dividers
Dual band
Electric, optical and optoelectronic circuits
Electronics
Exact sciences and technology
Ground plane
harmonic suppression
Harmonics
Harmonics suppression
Microstrip
Microwave circuits, microwave integrated circuits, microwave transmission lines, submillimeter wave circuits
Microwaves
Power dividers
Power harmonic filters
Power system harmonics
Rejection
Resonance
Resonant frequency
RLC circuits
Spirals
two resonance frequencies
Wilkinson power divider
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Summary:In this paper, we present an effective technique of second and third harmonic suppression for a Wilkinson power divider by using an asymmetric spiral defected ground structure (DGS). With the proposed technique, a single asymmetric DGS provides two different resonance frequencies because of the different sizes of spiral-shaped defects on the ground plane. The transfer function of the asymmetric DGS shows signal rejection characteristics at two different resonance frequencies and the characteristics of asymmetric DGS is modeled by two parallel RLC resonance circuits in cascade. With the insertion of asymmetric spiral DGS into a quarter-wave line of the Wilkinson power divider, the second and third harmonics are suppressed simultaneously. In experimental results, 18-dB suppression for the second harmonic and 15-dB suppression for the third harmonic, respectively, are achieved. Using asymmetric DGS, the size of a quarter-wave line is reduced by 9.1% compared to that of the conventional divider without a DGS.
ISSN:0018-9480
1557-9670
DOI:10.1109/TMTT.2005.848772