Abstract
Fractal geometries have shown to be a suitable choice for the antenna and microwave circuit designers to produce compact size microwave devices and components. Moreover, the multimode resonators are found advantageous in the design of reduced size multiband bandpass filters. In this paper, a stub loaded resonator (SLR) based on modified Minkowski fractal geometry, is suggested to produce a compact microstrip bandpass filter with dual-band response for wireless communication applications. Based on the second iteration Minkowski fractal geometry, dual-band compact microstrip BPF has been presented. The proposed filter structure is composed of two fractal based symmetrical SLRs. The filter structure has been etched using a substrate with dielectric constant of 3.02 and thickness of 1.425 mm. Simulation results show that the proposed fractal based SLR can be used to construct compact microstrip BPFs with dual-band responses. The lower resonant band is centered at about 1.875 GHz, and the upper resonant band is positioned at 5.575 GHz. The corresponding bandwidths of the two bands extend from 1.841–1.918 GHz and 5.438–5.650 GHz respectively. Besides the compact size, the suggested filter offers reasonable performance responses.
Highlights
The dramatic evolution in modern multi-service communication systems has imposed additional challenges on these systems to be compact and with multiband responses
Many techniques are adopted to design compact multiband BPFs based on the dual-mode and multimode resonators
The resulting BPFs have been shown to offer reasonable dual-band and multiband responses with high insertion loss in the out of the passbands
Summary
The dramatic evolution in modern multi-service communication systems has imposed additional challenges on these systems to be compact and with multiband responses. Sierpinski carpet and its variants have been suggested to propose a miniaturized dual-mode bandpass filter derived from the conventional square patch [9, 10] Fractal geometries such as Hilbert, Moore, and Koch are suggested to produce compact size bandpass filters [11,12,13,14,15,16]. Minkowski fractal based microstrip resonators have more attracted microwave filter designers to be successfully applied to produce compact dual-mode microstrip ring resonator BPFs, owing to its high space-filling property [20,21,22,23,24]. A modified variant of the Minkowski fractal curve has been applied to produce microstrip SLR resonators of the proposed BPFs. Besides the miniaturized size, the resulting BPFs have been shown to offer reasonable dual-band and multiband responses with high insertion loss in the out of the passbands
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