A novel Minkowski‐island‐based fractal patch for dual‐mode and miniaturization band‐pass filters

Abstract

A miniaturized dual‐mode band‐pass filter (BPF) using Minkowski‐island‐based (MIB) fractal patch resonator is presented in this article. The BPF is mainly formed by a λg/4 square patch resonator, which is a MIB fractal configuration with second order iteration is embedded in the patch. By tuning the perturbation, which resulted from the fractal patch, two resonant modes are excited and a pair of transmission zeros are generated to improve the BPF performance. The proposed filter at center frequency (f0) of 630 MHz has very good measured characteristics including the bandwidth of 552–708 MHz (3‐dB fractional bandwidth of 24.8%), low insertion loss of –1.38 dB and size reduction with 76.4%. The filter performance is characterized to verify the design concept. © 2011 Wiley Periodicals, Inc. Microwave Opt Technol Lett 53:594–597, 2011; View this article at wileyonlinelibrary.com. DOI 10.1002/mop.25796

Inter-digital coupled dual-mode patch resonator with crossed-island configuration for tri-band filter design

“…Analogized to the slot etched resonator , the crossed‐line patch resonator is proposed at first. Then, merged the crossed‐line patch resonator and the MIB fractal resonator , the crossed‐island patch resonator is obtained for improving the MIB fractal resonator. The dimensions of the square patch resonators are: (a) original patch: L 1 = 8.7mm, L 2 = 1.2mm, W 1 = 5.0mm, W 2 = 2.5mm, W 3 = 0.35mm,W 4 = 0.1mm, g = 0.1mm, and W p1 = W p2 = 1.45mm. (b) crossed‐line patch: L 1 = 8.7mm, L 2 = 2.4mm, W 1 = 3mm, W 2 = 2mm, W 3 = 0.5mm, W 4 = 0.2mm, W 5 = 0.25mm, W 6 = 4.38mm, W 7 = 3.09mm, g = 0.1mm, and W p1 = W p2 = 1.45mm (c) crossed‐island patch: L 1 = 8.7mm, L 2 = 4.0mm, W 1 = 3mm, W 2 = 2mm, W 3 = 0.3mm, W 4 = 0.25mm, W 5 = 0.26mm, W 6 = 4.36mm, W 7 = 3.08mm, W 8 = 0.9mm, W 9 = 0.9mm, g = 0.2mm, and W p1 = W p2 = 1.8mm. …”

“…Dual‐mode filters have been widely used in wireless communications systems because of their advantages in applications such as small size and low loss . There are several commonly used dual‐mode patch resonators including crossed slots , loaded crossed‐slots , right crossed‐slots , slot etched , and fractal configurations in a square patch. The arc‐oriented slot etched into a circular patch was used to design a dual‐mode dual‐band BPF .…”

Design of miniaturized dual-mode microstrip bandpass filter based on a novel fractal resonator

“…Since then, research work in this field has shown a dramatic increase. A variety of fractal geometries have been applied to design compact BPFs [8][9][10].…”

Compact single‐feed circularly polarized aperture‐coupled stack antenna with minkowski‐island‐based fractal patch

“…By increasing the iteration order of Minkowski‐island‐based (MIB) fractal resonator, it indicated a miniaturized property. A second‐order MIB fractal resonator was used to design a high performance dual‐mode BPF at direct television (DTV) ultra high frequency (UHF) bands [11].…”

“…Merging the features of single‐feed aperture‐coupled stack antenna [1–4], orthogonal modes [6–8], dual‐mode of ring/loop resonators [9, 10], and MIB fractal resonator [11], a novel stack antenna constructed with a perturbed MIB fractal patch, an aperture‐coupled structure, and a straight‐strip feed line is proposed in this article. First, by increasing the iteration order of MIB fractal resonator, the resonant frequency can be moved toward the lower frequency, indicating a miniaturized property.…”