Abstract
This paper presents an effective technique to suppress the spurious passbands in planar filters by using defected ground structure (DGS) resonators etched in the ground plane. The proposed miniaturized hairpin DGS slot resonator is researched in terms of its resonance frequency, corresponding coupling topologies, and filter design. The resonator and the topologies of coupled DGS resonators are simulated in a fullwave electromagnetic (EM) simulator. Using a curve-fitting technique, useful design formulas are proposed for filter synthesis. Using the synthesis procedure, a 3rd order filter design is simulated, manufactured and measured. The insertion loss of -3dB in the passband of 280MHz is observed, while the suppression of the spurious passbands up to 12GHz is more than 24dB.
Highlights
Bandpass filters used in modern microwave communication systems have to comply with very strict requirements about their performance, size and volume
The introduction of etched slots in the ground plane of a microstrip line adds degrees of freedom in the design and synthesis of microstrip filters. These are known as defected ground structures (DGS)
The use of DGS resonators can solve a serious problem in filter design the small gap that is required between coupled lines in order to achieve strong coupling
Summary
Bandpass filters used in modern microwave communication systems have to comply with very strict requirements about their performance, size and volume. The introduction of etched slots in the ground plane of a microstrip line adds degrees of freedom in the design and synthesis of microstrip filters. These are known as defected ground structures (DGS). They can be periodic or non-periodic disturbances in the ground plane of the microstrip line Their shape can be adopted from microstrip resonators [1] and appears to be dual to them. The use of DGS resonators can solve a serious problem in filter design the small gap that is required between coupled lines in order to achieve strong coupling. There is a good agreement between theoretical, simulated and measured results
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