scholarly journals Design of a Super Compact UWB Filter Based on Hybrid Technique with a Notch Band Using Open Circuited Stubs

2020 ◽  
Vol 9 (3) ◽  
pp. 39-46
Author(s):  
H. El Omari El Bakali ◽  
H. Elftouh ◽  
A. Farkhsi ◽  
A. Zakriti ◽  
M. El Ouahabi
Keyword(s):  
Coplanar Waveguide ◽  
Bottom Layer ◽  
Basic Structure ◽  
Ultra Wideband ◽  
Band Pass Filter ◽  
Hybrid Technique ◽  
Pass Filter ◽  
Delay Performance ◽  
Notch Band ◽  
Satellite Applications

This paper presents a new design of a super compact Ultra wideband (UWB) band-pass filter (BPF) with rejection of X-band satellite applications. For covering the UWB bandpass, the proposed filter is realized using hybrid technique which is achieved by using a Microstrip-Coplanar waveguide-Microstrip transition. The basic structure consists of a modified microstrip in the top layer and CPW in the bottom layer. Later, open-circuited stubs are embedded in the top to implement in-band transmission zeros (TZ) so as to circumvent interference. The simulated results show that the UWB bandpass filter has a high adaptation (S11 ≤ −18 dB) and insertion loss better than 0.4 dB at the passband. The impedance bandwidths are about 114% (3–11 GHz) with upper stopband extends to more than 14 GHz with a depth of greater than 38 dB. In addition, the UWB BPF shows a flat group delay performance with a variation of about 0.15 ns over the entire bandwidth. A prototype of the filter is fabricated and tested. Good agreement is achieved between measurement and simulation. The proposed UWB BPF is compact in size with overall dimensions of 14 by 9.2 mm2. Consequently, the obtained results prove that the presented filter is suitable for UWB wireless devices.

A compact UWB band-pass filter with a notch band using multi-mode stub-loaded resonators (MM-SLR)

2018 ◽  
Vol 10 (2) ◽  
pp. 227-233
Author(s):  
Gholamreza Karimi ◽  
Fatemeh Javidan ◽  
Amir Hossein Salehi
Keyword(s):  
Stop Band ◽  
Ultra Wideband ◽  
Pass Band ◽  
Band Pass Filter ◽  
Pass Filter ◽  
Notch Band ◽  
Compact Size ◽  
Mathematical Formulas ◽  
Band Pass ◽  
Multi Mode

AbstractIn this paper, an ultra-wideband (UWB) band-pass filter (BPF) with a sharp notch band is presented. The UWB BPF consists of modified elliptical-ring and multi-mode stub-loaded resonator (MM-SLR). By adding the asymmetric tight coupled lines resonator via input/output (I/O) lines, it can be achieved UWB band-pass response. With adding two bends to the middle resonator, a notch band at 6.86 GHz is created, so that it can be controlled using the mathematical formulas (MF). In the meantime, the equivalent circuit of the middle resonator is obtained using L–C analysis. Measured results of fabricated filter have the advantage such as ultra-wide pass band (flandfHof the defined UWB pass band are 3.776 and 10.42 GHz, which satisfy the requirements of FCC-specified UWB limits), compact size, low insertion loss <0.65 dB and the stop band of the proposed filter is from 11.1 to 16.32 GHz with attenuation of −39.8 to −42.14 dB, respectively. The proposed UWB filter is realized using the substrate with dielectric constant of 2.2 and substrate height of 0.787 mm. Experimental verification is provided and good agreement has been found between simulation and measurement results.

Design of a compact multi-mode UWB band pass filter with flexible notch band employing interdigital coupled lines

2015 ◽  
Vol 8 (7) ◽  
pp. 1023-1029
Author(s):  
Fatemeh Sabaghi ◽  
Gholamreza Karimi ◽  
Arash Ahmadi
Keyword(s):  
Local Area Network ◽  
Ultra Wideband ◽  
Mode Analysis ◽  
Area Network ◽  
Band Pass Filter ◽  
Network Systems ◽  
Pass Filter ◽  
Resonance Frequencies ◽  
Coupled Lines ◽  
Radial Stub

A novel ultra-wideband Microstrip bandpass filter using Radial Stub Loaded Resonator (RSLR) and interdigital coupled Lines is presented in this paper. The RSLR and decagonal patch form a resonator named M to create tuneable multiple notches in the passband for the suppression of Wireless Local Area Network systems’ interference. To realize sharp roll-off, two adjustable transmission nulls are located at the lower and upper frequencies out of the passband. Even and odd-mode analysis is presented to calculate modal resonance frequencies contributing to create the ultra-wide passband. Bessel function is employed to estimate the input impedance of the radial stub which is used in formulation of even and odd mode admittances. Simulated and measured results show a passband from 3.4 to 12 GHz (135% bandwidth around 6.39 GHz) with a rejection notch at 4.99 GHz is achieved with return losses better than 14 and 12 dB in the first and second passbands, respectively. The insertion loss is lower than 0.9 dB in the 90% of passband and rejection level is greater than 19 dB from 12.25 to 17.45 GHz.

scholarly journals Design of a Broadband Band-Pass Filter with Notch-Band Using New Models of Coupled Transmission Lines

2014 ◽  
Vol 2014 ◽  
pp. 1-12 ◽  
Author(s):  
Navid Daryasafar ◽  
Somaye Baghbani ◽  
Mohammad Naser Moghaddasi ◽  
Ramezanali Sadeghzade
Keyword(s):  
Frequency Response ◽  
Transmission Lines ◽  
Band Pass Filter ◽  
Pass Filter ◽  
New Model ◽  
Notch Band ◽  
New Models ◽  
Basic Parameters ◽  
Band Pass ◽  
Coupled Transmission Lines

We intend to design a broadband band-pass filter with notch-band, which uses coupled transmission lines in the structure, using new models of coupled transmission lines. In order to realize and present the new model, first, previous models will be simulated in the ADS program. Then, according to the change of their equations and consequently change of basic parameters of these models, optimization and dependency among these parameters and also their frequency response are attended and results of these changes in order to design a new filter are converged.

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