Multiband hairpin-line bandpass filters by using metamaterial complimentary split ring resonator

Mohd Fairus Mohd Yusoff,Muhammad Akram Mohd Sobri,Zaharah Johari,Farid Zubir

doi:10.11591/ijeei.v7i2.1172

Abstract

Telecommunication systems for the new generation have greatly stimulated the demand for multi-band bandpass ﬁlters with compact dimensions, low insertion loss, robust, low cost and less complex design. In this paper, a compact multi-band bandpass filter, with the fractional bandwidth of 40% and 20% at resonant frequency 3.5 and 5.5 GHz respectively with the response of Chebyshev passband ripple of 0.1 dB is presented. This bandpass filter is suitable for WiMAX application. The design is based on the hairpin-line configuration and metamaterial of complementary split ring resonator structure. The hairpin-line is used for the compact structure design and easy to fabricate because it has open-circuited ends that require no grounding. While the complementary split ring resonator structure is easy to design and can provide multi-band without affecting of size and performance of the filter. The simulated results show the dual-band bandpass response with the insertion loss is 0 dB and high attenuation at stopband. The proposed ﬁlter provides a compact, low insertion loss, and less complex structure design that are promising candidates in order to meet the demands of the new generation of communication systems.

Highlights

The development of the telecommunication systems have enhanced the requirement for more sophisticated devices in order to meet the demands of the new generation of communication systems
The s-parameter result shows the bandpass characteristic response of the complementary split ring resonator (CSRR) with the series gap configuration at 5 GHz and the bandwidth is around 400 MHz as shown in Figure 6 (a)
The CSRR without a series gap shown a bandstop characteristic at 5 GHz with bandwidth around 500 MHz as shown in Figure 6 (b). Based on these results, the filter performances for single CSRR unit cell is not very good especially for bandpass filter because at the upper cut-off frequency the attenuation loss is lower. To solve this problem, three CSRRs unit cell is added in cascade to increase the attenuation loss at upper frequency

Summary

INTRODUCTION

The development of the telecommunication systems have enhanced the requirement for more sophisticated devices in order to meet the demands of the new generation of communication systems. Most of the wireless communication systems require a multifunctional device that can be operated in two or more frequency bands, small size, compact, robust and low cost. The hairpin-line band-pass filter is one of the most popular microstrip filter configurations used for the compact structure. This design is easy to fabricate because it has open-circuited ends that require no grounding. In RF and microwave engineering, in order to obtain properties not present in the conventional material, the metamaterial transmission lines have been proposed. The CSRRs structure is combined with the hairpin-line bandpass filter to produce multi-band frequency responses. A proposed multi-band bandpass filter has provided compact size, less complex design with low insertion loss and high attenuation at stopband

FILTER DESIGN

RESULTS AND DISCUSSION

CONCLUSION