Design of 6-gon-Shaped Notch Filter for Cognitive Radio Applications

2018 ◽  
Vol 27 (06) ◽  
pp. 1850085
Author(s):  
A. Uma Maheswari ◽  
K. Latha
Keyword(s):  
Cognitive Radio ◽  
Return Loss ◽  
Group Delay ◽  
Bandpass Filter ◽  
Narrow Band ◽  
Notch Filter ◽  
Structural Features ◽  
Fractional Bandwidth ◽  
Multiple Mode ◽  
Mode Resonator

This paper presents a 6-gon-shaped bandpass and notch filters for Cognitive Radio (CR) applications. The bandpass filter consists of a 6-gon-shaped multiple mode resonator with interdigital coupling at both ends. The notch filter is derived from bandpass filter by embedding four identical Embedded Open Stubs (EOS) nearby the multiple mode resonators that introduce narrow band suppression in the desired passband. Such bandpass filter with notching band is required in practical CR systems in order to effectively sense the spectrum and avoid the interference between the systems working in same environment with the same frequency. The filter is simulated using an electromagnetic solver, IE3D. The group delay obtained for bandpass filter is below 0.2[Formula: see text]ns. With the above structural features, the overall dimension of the filter is [Formula: see text][Formula: see text]mm2 and the fractional bandwidth (FBW) of the proposed bandpass filter is more than 100% with optimal performances in terms of insertion loss, return loss, group delay and phase.

scholarly journals Design and Analysis of Interdigital Coupled Ultra Wideband Bandpass Filter using Multimode Resonator

2019 ◽  
Vol 9 (1) ◽  
pp. 1456-1459
Keyword(s):  
Return Loss ◽  
Group Delay ◽  
Bandpass Filter ◽  
Capacitive Coupling ◽  
Ultra Wideband ◽  
Fractional Bandwidth ◽  
Wireless Applications ◽  
Feed Line ◽  
Multi Mode ◽  
Mode Resonator

In this paper, an interdigital coupled microstrip bandpass filter incorporated with shorted stub multi-mode resonator at ultra-wideband spectrum is presented. Proposed filter is characterized by its ultra compactness achieved through multi-mode resonator. The proposed filter is incorporated with interdigitated transmission line based on Lange Coupler topology. This structure enhances capacitive coupling between feed line and MMR which improves lower frequency selectivity of BPF. The parameters viz. fractional bandwidth of 105%, return loss above 20 dB and insertion loss below 1 dB at centre frequency of 4.875 GHz are recorded. The bandwidth of the filter is measured to be 5.15 GHz (2.3 to 7.45 GHz). The filter shows good linearity with its group delay recorded 0.2 ns with small variations of 0.1 ns at maximum in its passband. The compactness of proposed filter makes it suitable for various modern wireless applications.

Design and analysis of a planar UWB bandpass filter with stopband characteristics using MMR technique

2021 ◽  
pp. 1-8
Author(s):  
Gaurav Saxena ◽  
Priyanka Jain ◽  
Y. K. Awasthi
Keyword(s):  
Return Loss ◽  
Group Delay ◽  
Bandpass Filter ◽  
Ground Plane ◽  
Cost Effective ◽  
Ultra Wideband ◽  
Defected Ground Structures ◽  
Ground Structures ◽  
Multi Mode ◽  
Mode Resonator

Abstract In this paper, a ultra-wideband (UWB) bandpass filter with stopband characteristics is presented using a multi-mode resonator (MMR) technique. An MMR is formed by loading three dumbbell-shaped (Mickey and circular) shunt stubs placed in the center and two symmetrical locations from ports, respectively. Three circular and arrowhead defected ground structures on the ground plane are introduced to achieve UWB bandwidth with a better roll-off rate. The proposed filter exhibits stopband characteristics from 10.8 to 20 GHz with a 0.4 dB return loss. The group delay and roll-off rate of the designed filter are <0.30 ns in the passband and 16 dB/GHz at lower and higher cut-off frequencies, respectively. The dimension of the filter is 0.74λg × 0.67λg mm2 and was fabricated on a cost-effective substrate. All simulated results are verified through the experimental results.

A multi-mode resonator-based UWB bandpass filter with wide stopband

2015 ◽  
Vol 8 (7) ◽  
pp. 1031-1035 ◽  
Author(s):  
Ting Zhang ◽  
Fei Xiao ◽  
Xiaohong Tang ◽  
Lei Guo
Keyword(s):  
Return Loss ◽  
Bandpass Filter ◽  
Mode Analysis ◽  
Frequency Range ◽  
Coupled Line ◽  
Resonance Characteristic ◽  
Line Section ◽  
Multi Mode ◽  
Mode Resonator ◽  
Better Than

In this paper, a novel multi-mode resonator is presented, which is formed by cascading several open-circuited transmission line sections with a coupled-line section. Owing to its symmetry, even- and odd-mode analysis methods are applied to analyze its resonance characteristic. Based on this resonator, a microstrip ultra-wide bandwidth (UWB) bandpass filter is designed, fabricated, and measured. The simulated and measured results show that its bandwidth can cover the desired UWB. Return loss in passband is better than −14 dB. This filter is featured by good selectivity and wide stopband. Stopband suppression as low as −40 dB can be achieved within frequency range from 12 to 16 GHz.

A Continuously Tunable Bandpass Filter Using Distilled Water Based on Multiple-Mode Resonator

2020 ◽  
Vol 30 (5) ◽  
pp. 477-480
Author(s):  
Jian-Hui Guo ◽  
Sai-Wai Wong ◽  
Jing-Yu Lin ◽  
Yin Li ◽  
Long Zhang ◽  
...  
Keyword(s):  
Bandpass Filter ◽  
Distilled Water ◽  
Multiple Mode ◽  
Water Based ◽  
Mode Resonator ◽  
Tunable Bandpass Filter

A Step-by-Step Approach to Bandpass/Channel Filter Design

2021 ◽  
Vol 10 (2) ◽  
pp. 1-14
Author(s):  
Augustine O. Nwajana
Keyword(s):  
Return Loss ◽  
Bandpass Filter ◽  
Filter Design ◽  
Reference Source ◽  
Fractional Bandwidth ◽  
Microstrip Technology ◽  
Centre Frequency ◽  
Device Size ◽  
Channel Filter ◽  
Good Agreement

This paper presents a step-by-step approach to the design of bandpass/channel filters. The chapter serves as a reference source to microwave stakeholders with little or no filter design experience. It should help them design and implement their first filter device using the microstrip technology. A 3-pole Chebyshev bandpass filter (BPF) with centre frequency of 2.6 GHz, fractional bandwidth of 3%, passband ripple of 0.04321 dB, and return loss of 20 dB has been designed, implemented, and simulated. The designed filter implementation is based on the Rogers RT/Duroid 6010LM substrate with a 10.7 dielectric constant and 1.27 mm thickness. The circuit model and microstrip layout results of the BPF are presented and show good agreement. The microstrip layout simulation results show that a less than 1.8 dB minimum insertion loss and a greater than 25 dB in-band return loss were achieved. The overall device size of the BPF is 18.0 mm by 10.7 mm, which is equivalent to 0.16λg x 0.09λg, where λg is the guided wavelength of the 50 Ohm microstrip line at the filter centre frequency.

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