Compact UWB Bandpass Filter with Narrow Notch-Band and Wide Stop-Band

Due to the progression growth of multiservice wireless communication systems in a single device, multiband bandpass filter has attract a great attention to the end user. Therefore, multiband bandpass filter is a crucial component in the multiband transceivers systems which can support multiple services in one device. This paper presents a design of dual-band bandpass filter at 2.4 GHz and 3.5 GHz for WLAN and WiMAX applications. Firstly, the wideband bandpass filter is designed at a center frequency of 3 GHz based on quarter-wavelength short circuited stub. Three types of defected microstrip structure (DMS) are implemented to produce a wide notch band, which are T-inversed shape, C-shape, and U- Shape. Based on the performance comparisons, U-shaped DMS is selected to be integrated with the bandpass filter. The designed filter achieved two passbands centered at 2.51 GHz and 3.59 GHz with 3 dB bandwidth of 15.94 % and 15.86 %. The proposed design is very useful for wireless communication systems and its applications such as WLAN and WiMAX

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Microwave Bandpass Filter Integrated with Notch Response for Wide-band Applications

Indonesian Journal of Electrical Engineering and Computer Science ◽

10.11591/ijeecs.v11.i2.pp797-804 ◽

2018 ◽

Vol 11 (2) ◽

pp. 797

Author(s):

Mussa Mabrok ◽

Zahriladha Zakaria ◽

Nurhana Abu Hussin ◽

Mohamad Ariffin Mutalib

Keyword(s):

Communication Systems ◽

Bandpass Filter ◽

Wide Band ◽

Design System ◽

Substrate Thickness ◽

Notch Band ◽

Military Applications ◽

Communication Devices ◽

Advance Design System ◽

Better Than

This paper presents the design of wide-band bandpass filter using microstrip structure at 3-6GHz with fractional bandwidth of 66.67% based upon short-circuited stubs structure of 5th degree. In order to avoid the interference from existing system that operates in the frequency band, the folded stepped impedance resonator (SIR) was introduced to generate a narrow notch band at 5.2GHz. Pin diode is employ as switching mechanism for the notch response. This design is simulated by Advance Design System (ADS) software and using Roger Duroid 4350B with a dielectric constant of 3.48, substrate thickness 0.508mm and loss tangent 0.0019.The achieved return loss is better than 15dB and insertion loss is less than 1dB.The designed filter can be used in microwave communication systems such as wireless communication devices and military applications (radar system).

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A compact ultra-wideband bandpass filter with WLAN notch band

Microwave and Optical Technology Letters ◽

10.1002/mop.24093 ◽

2008 ◽

Vol 51 (2) ◽

pp. 503-507 ◽

Cited By ~ 2

Author(s):

Pai-Yi Hsiao ◽

Ro-Min Weng

Keyword(s):

Bandpass Filter ◽

Ultra Wideband ◽

Notch Band

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Novel Spurious Suppression Approach for SIR Dual-band Bandpass Filter Design

Frequenz ◽

10.1515/freq-2014-0055 ◽

2014 ◽

Vol 69 (1-2) ◽

pp. 65-70

Author(s):

Jianzhong Chen ◽

Xuefeng Li ◽

Hongyu Shi ◽

Anxue Zhang

Keyword(s):

Bandpass Filter ◽

Filter Design ◽

Stop Band ◽

Design Approach ◽

Dual Band ◽

External Quality ◽

Resonant Frequencies ◽

Coupling Property ◽

Spurious Suppression ◽

Stepped Impedance Resonator

Abstract A new design approach for a stepped impedance resonator (SIR) dual-band bandpass filter (BPF) with high multi-spurious suppression is proposed in this paper. The external coupling property of an SIR at multi-order resonant frequencies is fully studied. Different input impedances at desired frequencies are achieved by optimizing the unequal impedance transformer. The new solution shows the freedom in the choice of tapping point. The external quality values of multi-order harmonics vary with the shift of the tapping position. Wide upper stop-band rejection is realized by mismatching Qe at the unwanted harmonic frequencies, while keeping the Qe suitable for operating dual band to obtain good in-band performance. A traditional dual-band BPF and a novel practical BPF operated at 2.45/5.25 GHz are designed and fabricated to demonstrate the above idea. Good simulated and measured results are presented.

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