Abstract
In this paper, a novel compact ultra wideband (UWB) bandpass filter (BPF) based on fractal-shaped defected ground structure is designed and developed with more than -20 dB out-of-band rejection level. It is made of stepped impedance line and composite right/left handed-transmission line (CRLH-TL) constructed with capacitive gap in conductor strip and a hybrid fractal-shaped ring slot in ground plane. The proposed UWB bandpass filter has good passband performance with -10 dB return-loss bandwidth of 2.2 GHz to 10.6 GHz with fractional bandwidth of 131%. The prototype of proposed filter is fabricated and measured. Good agreement is seen between simulated and measured results. The designed and developed filter is compact in size, simple in geometry and owns good S-parameters performance characteristics in both passband as well as in stopband. Return-loss better than 10 dB and insertion-loss less than 0.4 dB (except at some higher frequency) is obtained throughout the passband whereas, in stopband, insertion-loss more than 20 dB and return-loss better than 0.8 dB is observed up to the stopband frequency of 20 GHz. Moreover, UWB BPF also shows the flat group delay (variation ≤ 0.75 ns) performance. Thus the proposed filter can be a useful candidate for low profile future wireless communication systems.
Highlights
Rapid growth and interest for the development of Ultra wideband (UWB) system is seen since the authorization by U.S Federal Communications Commission (FCC) for unlicensed use of ultra wideband (UWB) frequency band from 3.1GHz to 10.6 GHz for commercial purposes in 2002 [1]
MEASUREMENT RESULTS AND DISCUSSION To validate the performance, a prototype of proposed UWB bandpass filter (BPF) is fabricated based on optimized dimensional parameters and measured
It can be seen that the measured insertion-loss, |S21| is better than 1.1 dB within the entire -10 dB return loss passband from 2.2 GHz to 10.6 GHz irrespective of simulated |S21| which is better than 0.6 dB
Summary
Rapid growth and interest for the development of Ultra wideband (UWB) system is seen since the authorization by U.S Federal Communications Commission (FCC) for unlicensed use of UWB frequency band from 3.1GHz to 10.6 GHz for commercial purposes in 2002 [1]. UWB system nowadays becomes most promising technologies for short range low power indoor wireless communication. As an important component in UWB communication systems, the UWB bandpass filter has been rapidly developed. The great potential of UWB system for developing modern transmission system increased the demand for designing filter with low insertion-loss, higher out-ofband rejection capability and flat group delay characteristics within the desirable band. Brazilian Microwave and Optoelectronics Society-SBMO received 30 June 2016; for review 30 June 2016; accepted 08 Dec 2016
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callMore From: Journal of Microwaves, Optoelectronics and Electromagnetic Applications
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
