Resonant properties of the Sierpinski‐based fractal resonator and its application on low‐loss miniaturized dual‐mode bandpass filter

Abstract

the maximum of Ϫ40 dB. S 21 showed a similar shape as S 31 and S 41 , but slightly exceeded Ϫ40 dB in the specific frequency band, 5-7 GHz. It is a reason that only one EBG cell exists between port 1 and 2, so the suppression function of EBG did not operate properly. So, it was confirmed from the results that the proposed triangular EBG structure can provide the means of effectively eliminating SSN at the entire PCB board. CONCLUSIONIn this article, a novel uniplanar compact electromagnetic bandgap (UC-EBG) composed of triangular-type unit cells with two bridges is proposed for the ultra-wideband suppression of SSN from 800 MHz to 15 GHz and beyond. The SSN suppression performance of the proposed structure has been validated both numerically and experimentally. When compared with traditional UC-EBG structures, the key feature of the proposed structure lies in the use of a triangular structure with different bridges as the EBG unit cell, which extends the suppression frequency range up to 15 GHz and beyond. Furthermore, it is clear that triangular shaped unit cells would be a more suitable structure for application to arbitrarily shaped P/G planes than rectangular ones. As such, the proposed structure could be widely used to build stable power distribution networks in high-speed digital systems.ABSTRACT: In this article, resonant characteristics of novel microstrip resonators based on the Sierpinski carpet fractal geometries are proposed in detail. With increasing the iteration order of the Sierpinskibased fractal resonators, the resonant frequency is decreased but the unloaded quality factor is slightly enhanced. The resonant properties are discussed using the RLC equivalent circuit. Additional, the design guide for bandpass filter using the nth order resonator is also developed. Using these fractal resonators, several dual-mode bandpass filters using different order resonators can be designed and fabricated to verify the advantages of the size and insertion loss reduction. It is also found good agreement between the simulation and measurement is achieved.ABSTRACT: This article presents a dual-mode dual-band bandpass filter based on double-sided parallel-strip line with an inserted conductor plane. Due to the isolation property of the conductor plane, this structure can provide two separate transmission paths to generate two passbands. No extra combination circuits are required at the input/output ports, simplifying the design and reducing circuit area. To demon-Figure 5 (a) Photograph and (b) passband and wideband performance of the dual-mode BPF with the 3rd order resonator. (For center frequency of 2.4 GHz, l ϭ 17 mm, L 1 ϭ 2.4 mm, L 2 ϭ 7.81 mm, W 1 ϭ 1.2 mm, W 2 ϭ 0.1 mm, and S ϭ 0.1 mm. Parameters are defined in Fig. 3)

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

“…At center frequency ( f 0 ) of 630 MHz, bandwidth of 552–708 MHz (3‐dB fractional bandwidth of 24.8%) and low insertion loss of –1.38 dB are obtained. In contrast to the size reduction of 50% [4], 58% [5], and 24% [12], a 76.4% size reduction is obtained in the proposed filter.…”

“…And the patch resonators using inductively loaded crossed‐slots or right crossed‐slots are used to reduce the loss and to generate the BPF with transmission zeroes. Recently, the dual‐mode filters with Sierpinski‐based fractal resonator were introduced [10–12]. The basic characteristics of the fractal geometry are space‐filling and self‐similarity.…”

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].…”

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

“…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 .…”