scholarly journals A New Lowpass Filter Unit Cell with Sharp Roll-off and Improved Stopband Performance in Coplanar Waveguide Technology

2018 ◽  
Vol 7 (5) ◽  
pp. 14-19
Author(s):  
A. Bijari ◽  
M. Mohebrad
Keyword(s):  
Insertion Loss ◽  
Coplanar Waveguide ◽  
Unit Cell ◽  
Lowpass Filter ◽  
Transmission Zero ◽  
High Impedance ◽  
Filter Structure ◽  
Filter Unit ◽  
Fifth Order

In this paper, a new compact unit cell for a coplanar waveguide (CPW) lowpass filter (LPF) is proposed. By combining a pair of coupled parallel stepped impedance resonators (SIRs) and high impedance short stubs in the CPW line, a fifth-order elliptic lowpass filter unit cell (LUC) is designed. The extra transmission zero introduced by parallel coupled SIRs is used to extend the stopband and increase the roll-off rate. The characteristics of the proposed LUC is investigated to achieve a sharp roll-off and a wide stopband. The measured results are in accordance with the simulated results. It has an insertion loss less than 0.9 dB from dc to 6 GHz, and a wide -15 dB stopband from 7.5 to 18 GHz. In addition, the filter dimensions are as small as 4.9 mm × 8.7 mm, that is, 0.046λg2, where λg is the guided wavelength at the cut-off frequency. The filter structure is simple and easy to fabricate as well.

WiMAX and C bands semi-fractal circularly polarized antenna with satellite bands filtering properties

2018 ◽  
Vol 10 (8) ◽  
pp. 978-983 ◽  
Author(s):  
T. Sedghi ◽  
T. Aribi ◽  
A. Kalami
Keyword(s):  
Coplanar Waveguide ◽  
Ground Plane ◽  
Ground Surface ◽  
Unit Cell ◽  
Dual Band ◽  
Satellite Systems ◽  
Directional Radiation ◽  
Cell Patterns ◽  
Feature Based ◽  
New Generation

AbstractA compact coplanar waveguide (CPW)-fed circular polarization (CP)-antenna for new generation applications with dual bands filtering performance along with CP feature based on unit-cell semi-fractal is proposed in this paper. The CP-antenna privileges from semi-fractal radiator causes to have a miniaturized size. The stopped bands are designed to suppress the interference with present WLAN and ITU-R satellite systems. These properties are obtained by embedding semi-fractal unit-cell patterns stubs at the radiator and applying two rectangular-shaped slits inside CPW ground plane and a pair of grounded L-shaped strips. By introducing the first step of semi-fractal strips, and the mirrored defected ground surface structures, dual-band rejection functionality at WLAN (5–6 GHz) and ITU-R (7.725–8.5 GHz) are practically obtained. Besides that, semi-fractal strips results to two orthogonal modes stimulation on the radiator and CP attribute are obtained at WiMAX (3.1–3.7 GHz). CP-antenna presents omni-directional radiation H-plane patterns over the applicational frequency band. The CP-antennas size is 25 mm × 25 mm and fabricated on commercially available FR4-epoxy substrate with 1 mm thickness. Measured results illustrate that the proposed ultimate CP-antenna with miniaturized structure, efficient impedance tuning characteristics, and adequate radiation performances is the best choice for new generation of wireless communications.

Study of Some New Topologies and Associated Techniques Used for the Achievement of Planar Filters

2017 ◽  
pp. 205-243
Author(s):  
Fouad Aytouna ◽  
Mohamed Aghoutane ◽  
Naima Amar Touhami ◽  
Mohamed Latrach
Keyword(s):  
Low Cost ◽  
Cutoff Frequency ◽  
Lowpass Filter ◽  
Microstrip Filter ◽  
Filter Structure ◽  
Microwave Components ◽  
Low Pass ◽  
New Research ◽  
Novel Design ◽  
Research Studies

This chapter will treat firstly a summary of the filters synthesis by using Butterworth and chebyshev techniques. After that, a second part will be devoted to the design of planar filters using different techniques; this section will present some examples in bibliography. The aim of this part is to understand the different methods and steps followed to design planar filters, in the same time to discover and to define the different parameters which characterize a filter structure. Therefore, we have chosen some new research studies on low pass filers. The last part will present our contribution in designing planar filter. The first filter structure is a dual bandpass microstrip filter operating for DCS and Wimax applications, this section will introduce the different steps followed to achieve such filter. The second circuit is a novel design low cost microstrip lowpass filter with a cutoff frequency of 2.3 GHz. At the end, we will present a transformation of the microstrip filter to a CPW lowpass filter making it easy for integration with passive and active microwave components.

Compact transition from CBCPW to substrate integrated suspended line (SISL) for operation up to 46 GHz

2019 ◽  
Vol 12 (2) ◽  
pp. 116-119
Author(s):  
F. Parment ◽  
A. Ghiotto ◽  
T.-P. Vuong ◽  
L. Carpentier ◽  
K. Wu
Keyword(s):  
Insertion Loss ◽  
Return Loss ◽  
Coplanar Waveguide ◽  
Experimental Results ◽  
Frequency Range ◽  
Better Than

AbstractA compact transition between conductor-backed coplanar waveguide (CBCPW) and substrate integrated suspended line (SISL) is presented. Compared to the reported transitions from CBCPW to SISL, performance and compactness are improved. For demonstration purpose, a multilayer transition is designed and fabricated for operation up to 46 GHz. Experimental results, based on an electronic calibration and thru–reflect–line calibration allowing measurement in the 0.01–50 GHz frequency range, demonstrate an insertion loss of 0.59 ± 0.51 dB with a return loss of better than 10 dB in the 10 MHz to 46 GHz frequency range.

A novel compact lowpass filter with sharp roll-off and wide stopband

2019 ◽  
Vol 12 (1) ◽  
pp. 21-33
Author(s):  
M. Hayati ◽  
AS. Abdipour ◽  
AR. Abdipour
Keyword(s):  
Transmission Lines ◽  
Lowpass Filter ◽  
Transmission Zeros ◽  
High Impedance ◽  
Attenuation Level ◽  
Measurement Results ◽  
High Figure ◽  
Frequency Behavior ◽  
Better Than ◽  
Resonance Cell

AbstractIn this paper, a microstrip lowpass filter adopting two main resonators with steep transition band and wide rejection band has been introduced. The first main resonance cell consists of meandered transmission lines which are loaded by modified T-shaped patches. The second main resonator is composed of high-impedance lines loaded by polygon patches. To obtain a steep skirt performance, the first and second resonators have been combined. Moreover, employing eight high–low impedance folded stubs and two rectangular open-stubs as suppressing cells has resulted in improving the stopband features. To comprehend the frequency behavior of the employed resonators and also their combination, the formulas of the transmission coefficient, reflection coefficient, and the transmission zeros of their equivalent LC circuits have been extracted, separately. According to the measurement results, the −3 dB operating frequency of this filter is 1.65 GHz. Moreover, a relative stopband bandwidth equal to 166% with a corresponding attenuation level of 23 dB and a sharp roll-off rate (393.61 dB/GHz) have been achieved. In the passband region from DC to 1.632 GHz, the insertion loss and return loss are better than 0.0763 and 15.85 dB, respectively, proving an acceptable in-band performance. Finally, the implemented structure brings about a high figure-of-merit equal to 81 672.

scholarly journals Compact tunable lowpass filter with sharp roll-off and low insertion loss

2017 ◽  
Vol 59 (10) ◽  
pp. 2619-2623 ◽  
Author(s):  
Ting Zhang ◽  
Zongqi Cai ◽  
Yang Yang ◽  
Jingfu Bao ◽  
Yiwen Wang
Keyword(s):  
Insertion Loss ◽  
Lowpass Filter ◽  
Low Insertion Loss

Bandstop Filters with Comb-Like Electromagnetic Bandgap Structures on CPW Stubs

2009 ◽  
Vol 74 ◽  
pp. 189-192
Author(s):  
Zhong Liang Deng ◽  
J.M. Huang ◽  
B.H. Ding
Keyword(s):  
Insertion Loss ◽  
Low Cost ◽  
Coplanar Waveguide ◽  
Ultra Wideband ◽  
Pass Band ◽  
Surface Micromachining ◽  
Electromagnetic Bandgap ◽  
Band Stop Filter ◽  
Immense Potential ◽  
Bandstop Filters

An ultra-wideband (UWB) band-stop filter (BSF) has been designed with flat responses at a selected frequency by cascading the unit electromagnetic bandgap (EBG) structures in this paper. The BSFs fabricated by the surface micromachining process have immense potential to compactness and low cost. The BSFs are constructed with comb-like EBG structures on a coplanar-waveguide (CPW) and have been investigated numerically. The simulation result of the BSF is demonstrated to have a good performance on its work band. It reveals a 20 dB stopband with a bandwidth of 6.8GHz. The pass-band insertion loss is less than 1.7dB.

scholarly journals Compact Microstrip Lowpass Filter with Low Insertion Loss for UWB Medical Applications

2018 ◽  
Vol 2018 ◽  
pp. 1-5 ◽  
Author(s):  
Mohammed A. Aseeri ◽  
Meshaal A. Alyahya ◽  
Hatim A. Bukhari ◽  
Hussein N. Shaman
Keyword(s):  
Insertion Loss ◽  
Elliptic Function ◽  
Ultra Wideband ◽  
Medical Applications ◽  
Lowpass Filter ◽  
Attenuation Level ◽  
Low Insertion Loss ◽  
Line Elements ◽  
Good Agreement ◽  
Rejection Band

A microstrip lowpass filter based on transmission line elements for UWB medical applications is proposed in this paper. The filter is constructed of two symmetric shunt open-circuited stubs and three series unit elements. The filter is designed to exhibit an elliptic function response with equal ripple in the passband and the rejection band. A prototype is successfully designed, fabricated, and measured, where a good agreement is attained. The filter shows a high filtering selectivity and an ultra-wide stopband up to 20 GHz with an attenuation level of more than 20-dB. The filter is compact and has a low insertion loss and an ultra-wideband (UWB) rejection which makes it attractive for many technologies such as UWB medical applications.

scholarly journals Ultra Wideband Coplanar Waveguide Antenna with an Improved Gain using a Frequency Selective Surfaces (FSS)

2019 ◽  
Vol 8 (9S) ◽  
pp. 145-149
Keyword(s):  
Time Domain ◽  
Coplanar Waveguide ◽  
Unit Cell ◽  
Ultra Wideband ◽  
Frequency Range ◽  
Rectangular Slot ◽  
Improved Performance ◽  
Set Up ◽  
The Time Domain ◽  
Uwb Applications

In this article, an ultra-wideband FSS reflector has been proposed to enhance the gain of a CPW antenna for UWB applications. A CPW fed antenna having dimensions of 38mm×38mm×1.605mm and FSS unit cell having dimensions 14mm × 14mm × 1.605 mm are presented in the paper. A rectangular slot and stubs are interleaved at the outer edges of the patch for achieving desired characteristics of an ultra-wideband for the frequency range of 3.39 GHz to 12.9 GHz. Simulation results carried out using the CST microwave 2016 version in the time domain are presented for the proposed antenna. An FSS unit cell designed and simulated using periodic boundary conditions and floquet ports is presented. The combined setup of an array of FSS reflector behind the antenna has been simulated in the time domain. This set up shows an improved performance in terms of antenna’s gain. A maximum and minimum gain of 8.14 dB and 4.98 dB has been observed with the presence of FSS reflector behind the coplanar waveguide antenna. A significant improvement of 2.9 dB has been observed over the entire band of antenna’s operation

scholarly journals Application of a Stub-Loaded Square Ring Resonator for Wideband Bandpass Filter Design

Electronics ◽  
2020 ◽  
Vol 9 (1) ◽  
pp. 176 ◽  
Author(s):  
Ping Zhang ◽  
Liqin Liu ◽  
Deli Chen ◽  
Min-Hang Weng ◽  
Ru-Yuan Yang
Keyword(s):  
Bandpass Filter ◽  
Ring Resonator ◽  
Filter Design ◽  
Structure Parameters ◽  
Compact Structure ◽  
Coupling Energy ◽  
High Impedance ◽  
Input And Output ◽  
Filter Structure ◽  
Resonant Modes

In this paper, a stub-loaded square ring resonator (SLSRR) is analyzed and applied to design a very simple and compact wideband bandpass filter structure. Resonant modes dependent on the structure parameters of the SLSRR are analyzed first, and then the first two modes are used to achieve a required passband. The input and output terminals are supplied with high impedance and strong coupling to provide sufficient coupling energy. Two wideband filter examples are designed, manufactured, and measured using the SLSRRs. The first filter is a wideband filter with a wide upper stopband, and the second filter is a dual wideband filter with a notched stopband between two passbands. The two filter examples are designed, fabricated, and measured to verify the design concept and present the advantages of easy design and a simple and compact structure.

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