Abstract
In this paper, a stub-loaded square ring resonator (SLSRR) is analyzed and applied to design a very simple and compact wideband bandpass filter structure. Resonant modes dependent on the structure parameters of the SLSRR are analyzed first, and then the first two modes are used to achieve a required passband. The input and output terminals are supplied with high impedance and strong coupling to provide sufficient coupling energy. Two wideband filter examples are designed, manufactured, and measured using the SLSRRs. The first filter is a wideband filter with a wide upper stopband, and the second filter is a dual wideband filter with a notched stopband between two passbands. The two filter examples are designed, fabricated, and measured to verify the design concept and present the advantages of easy design and a simple and compact structure.
Highlights
With the increased development of wireless communication technology, research of the bandpass filter (BPF) has become an important development direction
By setting the electrical length ratio, the resonant modes of the stub-loaded square ring resonator (SLSRR) can be controlled depending on the added stub and tuned effectively to the desired frequency
The second filter example has dual wideband responses, which the first and second responses resulted from SLSRR 1 and SLSRR 2 are set at 4 and 8.0 GHz, and
Summary
With the increased development of wireless communication technology, research of the bandpass filter (BPF) has become an important development direction. Most of the research and applications of the BPF still focus on the broadband and multi-band design [1,2]. Several resonator structures have been proposed to achieve the wideband filter design, such as the use of the step impedance resonator (SIR) [3,4], defect ground structure (DGS) [5], multi-layer structure [6], multi-mode (MMR) [7,8,9], stub-loaded resonator (SLR) [10,11,12,13], coupled-line [14,15], multiple-mode split-ring resonators (SRR) [16,17], and so on
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