Multiband Bandstop Filter using an I-Stub-Loaded Meandered Defected Microstrip Structure (original) (raw)
Related papers
Design and Analysis of Microstrip Bandstop Filter Based on Defected Ground Structure
This Paper presents a planar Microstrip Bandstop filter with the use of defected ground structure. The bandstop filter has been designed with the use of step impedance microstrip line on the top of substrate and two convention rectangular defects in a ground plane (Using DGS technique). It produces stopband from the frequency range of 3.3GHZ to 4.8GHZ with the stop band attenuation more than 30dB. It provides relative 3dB bandwidth response of 1.5GHZ.The tuning of frequency has been carried out with the change in dimension of defected ground plane. A simulation has been performed on ANASOFT High frequency structure simulator (HFSS) and an equivalent LC circuit of the design has been verified with ANASOFT designer 8.0 Software
IJERT-Design and Analysis of Microstrip Bandstop Filter based on Defected Ground Structure
International Journal of Engineering Research and Technology (IJERT), 2014
https://www.ijert.org/design-and-analysis-of-microstrip-bandstop-filter-based-on-defected-ground-structure https://www.ijert.org/research/design-and-analysis-of-microstrip-bandstop-filter-based-on-defected-ground-structure-IJERTV3IS050044.pdf This Paper presents a planar Microstrip Bandstop filter with the use of defected ground structure. The bandstop filter has been designed with the use of step impedance microstrip line on the top of substrate and two convention rectangular defects in a ground plane (Using DGS technique). It produces stopband from the frequency range of 3.3GHZ to 4.8GHZ with the stop band attenuation more than 30dB. It provides relative 3dB bandwidth response of 1.5GHZ.The tuning of frequency has been carried out with the change in dimension of defected ground plane. A simulation has been performed on ANASOFT High frequency structure simulator (HFSS) and an equivalent LC circuit of the design has been verified with ANASOFT designer 8.0 Software
A novel compact quad-band microstrip bandstop filter design using open-circuited stubs
2013 IEEE MTT-S International Microwave Symposium Digest (MTT), 2013
A novel compact quad-band microstrip bandstop filter design is presented. Input and output ports of the filter are connected with a high impedance transmission line. Proposed filter is designed by using open-circuited stubs attached to the input and output ports. Thus, based on the f r-3f r harmonic property of the stub-loaded resonators, four stopbands at 1.15-2.22, 2.94-4.56, 4.95-6.98 and 8.26-8.96 GHz are obtained. Insertion losses of all stopbands are better than 15 dB inside the stopbands. Under the even and odd mode excitations, resonance conditions of the structure are also investigated. For the experimental verification of the simulated results, proposed filter has been fabricated. Simulated and measured results are in a good agreement. Index Terms-Bandstop, quad-band, open-circuited stubs.
Bulletin of Electrical Engineering and Informatics, 2021
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.
Optik, 2018
A metamaterial (MTM) based filter with multiple band rejection characteristics is presented in this paper. By etching out two U shaped slots of different length from signal line, band notch characteristics at 5.8 GHz and 8.4 GHz are obtained. However by incorporating a pair of capacitive loaded loop (CLL) on either side of signal line, two more notches are obtained at 3.4 GHz and 6.9 GHz to avoid possible interference with few existing licence band. The prototype of the proposed micro strip band rejected filter is fabricated on RT-Duroid substrate of relative permittivity 2.2 and height of 0.787 mm. The electromagnetic full wave simulation results agree well with the measured result to validate the proposed idea. Simple design, compact size, good linearity and easy integration with other circuit like filtering antenna could be an attractive option in wireless environment.
Dual-band bandpass filter based on two u-shaped defected microstrip structure
Indonesian Journal of Electrical Engineering and Computer Science, 2021
This paper presents design of dual-band bandpass filter by integrating conventional quarter-wavelength short circuit stubs bandpass filter with Ushaped defected microstrip structure notch filter. Based on the parametric analysis, it is found that high attenuation level can be achieved by using two U-shaped defected microstrip structure separated by specific distance. The designed circuit simulated using advanced design system and fabricated based on Roger 4350B. The simulation results are in good agreement with measured results. The designed filter covered two pass bands centered at 2.51 GHz and 3.59 GHz with 3-dB fractional bandwidth of 15.94% and 15.86%, respectively, return losses better than 15 dB, and insertion losses better than 1 dB. The designed device can be used for wireless communication applications such as WLAN and WiMAX.
IEICE Electronics Express, 2011
A novel microstrip lowpass filter is proposed to achieve a very wide stopband and high selectivity as well as compact size. This filter utilizes a resonator with symmetric structure that consists of a transmission line, loaded with open stubs. Each stub ends with a defected taper and these tapers are coupled two by two to generate enhanced capacitances and increase the selectivity. Two units of these resonators are then used in combination with open stubs and triangular shaped resonators to widen the stopband and form the final filter. This filter is then fabricated and measured. The measured and simulated results are in good agreement.
Design and Analysis of Microstrip Low Pass and Bandstop Filters
Regular Issue, 2019
In this paper a simple approach of designing the microstrip low pass and bandstop filter is presented. The microstrip stub based low pass filter with 2.4 GHz and attenuation of more than 60 dB at 4 GHz frequency is designed. The bandstop filter is also designed with notch characteristics at 2.4 GHz frequency. The fractional bandwidth of designed filter is estimated to be 30% with 117 dB of attenuation is recorded at notch frequency of 2.4 GHz in SIR based bandstop filter topology. The bandstop filter is implemented using coupled line structure as well as step impedance resonator techniques. The filters are designed on Roger RC40003C substrate. The design and analysis of filter with its layout and EM simulation is accomplished using Agilent ADS software. These filters can be used in front end transceiver systems, antennas, and modern wireless communication systems.
Design of Triband Bandstop Filters Using a Stub-Loaded Stepped-Impedance Resonator
Progress In Electromagnetics Research Letters
A stub-loaded stepped-impedance resonator is proposed. Its input impedance is derived, and its resonant conditions are found. First order and second order triband bandstop filters are designed using this resonator. Simulations on both filters show that they generate three attenuation poles at 0.5, 1.2, and 2.1 GHz. The second order filter is also fabricated and characterized using a microwave vector network analyzer. Simulation and measurement results on the second order filter show good correlation.
Bandstop Filtering Characteristics of a New Spiral Defected Microstrip Structure (DMS)
The defected structure in the signal plane of a microstrip line effectively disturbs the shield current distribution and added line inductances and capacitances to the line. These new brand of slow-wave structures are called defected microstrip structure (DMS). We have introduced here a new spiral shaped structure with improved filtering characteristics. The frequency characteristics of the proposed unit show one pole stopband response. The equivalent L C parameters are extracted using proposed equivalent LC model. Two such DMS units are cascaded onto High-Low impedance line to realize a bandstop filter having 20 dB rejection bandwidth of 34% and sharpness factor of 50 dB/GHz at both edges.