Microstrip lowpass filter with wide stopband and sharp roll-off using modified radial stub resonator

2016 ◽  
Vol 9 (3) ◽  
pp. 499-504 ◽  
Author(s):  
Mohsen Hayati ◽  
Mehrnaz Khodadoost ◽  
Hamed Abbasi
Keyword(s):  
Transmission Lines ◽  
Insertion Loss ◽  
Return Loss ◽  
Lowpass Filter ◽  
Transition Band ◽  
Attenuation Level ◽  
Radial Stub ◽  
Better Than ◽  
Good Agreement

In this paper, a microstrip lowpass filter with wide stopband and sharp roll-off is presented. The proposed filter consists of a modified radial stub resonator which is cascaded by four suppressing cells. To reduce the overall size, the transmission lines are folded. The cut-off frequency of the proposed filter is 1.19 GHz. The transition band is approximately 0.2 GHz from 1.19 to 1.39 GHz with corresponding attenuation levels of 3–20 dB. The stopband is from 1.39 to 19 GHz with attenuation level of <20 dB. The insertion loss and return loss in the passband from DC to 0.8 GHz are better than 0.26 and 14 dB, respectively. The proposed filter is fabricated and measured. The simulated and measured results are in good agreement.

Design of Microstrip LPF with Sharp Cut-off Frequency and Wide Stopband

Frequenz ◽  
2014 ◽  
Vol 0 (0) ◽  
Author(s):  
G. Karimi ◽  
M. Yazdani ◽  
H. Siahkamari ◽  
A. Lalbakhsh
Keyword(s):  
Insertion Loss ◽  
Return Loss ◽  
Lowpass Filter ◽  
Transition Band ◽  
High Return ◽  
In Series ◽  
Low Insertion Loss ◽  
Simulation Results ◽  
Good Agreement

AbstractA novel lowpass filter with wide stopband and sharp skirt characteristics is proposed. To obtain the applicable lowpass filter, several cells of coupled T-shaped resonator, U-shape and dumbbell-shaped resonators are connected in series. The proposed filter has low insertion loss, high return loss in the passband and wide stopband. The transition band is from 3.18 to 3.29 GHz with −3 and −20 dB, respectively. Results of the fabricated filter exhibit a roll-off and relative stopband bandwidth of 217 and 137%, respectively. Measurement and simulation results show good agreement.

Ultra-wide stopband lowpass filters using ring resonators

2021 ◽  
pp. 1-7
Author(s):  
Mohsen Hayati ◽  
Sajjad Mohanad Mustafa ◽  
Farzin Shama ◽  
Hamed Abbasi
Keyword(s):  
Transition Region ◽  
Insertion Loss ◽  
Return Loss ◽  
Ring Resonator ◽  
Ring Resonators ◽  
Lowpass Filter ◽  
Sharp Transition ◽  
Attenuation Level ◽  
Ring Structures ◽  
Better Than

Abstract A microstrip-based lowpass filter (LPF) containing modified ring structures has been presented. Ring resonators are used to form a sharp transition region. In addition, rectangular- and tapered-shaped suppressing cells are used to create an ultra-wide stopband region. By combining the designed ring resonator and suppressors, an LPF has been designed with −3 dB cut-off frequency at 1.83 GHz. A sharp transition region has been achieved from 1.83 (at −3 dB) to 2.1 GHz (at −60 dB). A stopband region has been concluded from 2 to 21 GHz (with the corresponding attenuation level of at least 20 dB). The measured insertion loss is better than 0.1 dB (equal to a return loss of 18.1 dB) in the passband region. The proposed circuit is fabricated and measured. The measured results have an appropriate adaption with the simulated results.

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 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.

Broadband Transition between Rectangular Waveguide and Substrate Integrated Waveguide Based on Double Rhombus Antenna Probe

2014 ◽  
Vol 668-669 ◽  
pp. 799-802
Author(s):  
Hai Yan Jin ◽  
Teng Yue
Keyword(s):  
Insertion Loss ◽  
Rectangular Waveguide ◽  
Return Loss ◽  
Substrate Integrated Waveguide ◽  
Metal Waveguide ◽  
Low Insertion Loss ◽  
Better Than ◽  
Good Agreement

The paper presents a design of rectangular waveguide-SIW transition, which provides a broadband and low insertion loss performance. The broadband transition is realized by using double-rhombus antenna probe inserted into rectangular metal waveguide. The transition is simulated and measured at 9-20GHz. The measured results show that a good agreement with simulation and an insertion loss less than 2.8 dB and a return loss better than 10 dB are obtained at 10–18.5 GHz for a back-to-back structure.

A novel compact microstrip lowpass filter with wide rejection band and sharp transition band using diamond-shaped resonator

2013 ◽  
Vol 5 (6) ◽  
pp. 713-719 ◽  
Author(s):  
Mohsen Hayati ◽  
Mozhgan Amiri ◽  
Zahra Faramarzi
Keyword(s):  
Insertion Loss ◽  
Lowpass Filter ◽  
Sharp Transition ◽  
Transition Band ◽  
Communication Circuits ◽  
Compact Size ◽  
Attenuation Level ◽  
Measurement Results ◽  
Filter Size ◽  
Rejection Band

In this paper, a novel compact microstrip lowpass filter (LPF) using diamond-shaped resonator with wide rejection and sharp transition band is presented. The proposed filter has −3 dB cut off frequency at 2.6 GHz. The maximum insertion loss is only 0.1 dB in the passband and the rejection band extends from 2.89 to 20.84 GHz with the attenuation level better than −21 dB. The transition band is only 0.288 GHz, from 2.606 to 2.894 GHz with corresponding attenuation levels of −3 and −20 dB, respectively. The filter size is 12.4 × 11.5 mm2. The proposed filter is fabricated and tested, where the measurement results are in good agreement with the simulation results. The proposed LPF has compact size, simple structure, wide rejection band, and low insertion loss, where all of these characteristics are essential for LPF in the modern communication circuits.

scholarly journals A balanced-to-balanced directional coupler based on branch-slotline coupled structure

Frequenz ◽  
2020 ◽  
Vol 74 (11-12) ◽  
pp. 427-433
Author(s):  
Yaxin Liu ◽  
Feng Wei ◽  
Xiaowei Shi ◽  
Cao Zeng
Keyword(s):  
Directional Coupler ◽  
Return Loss ◽  
Design Method ◽  
Differential Mode ◽  
Arbitrary Power ◽  
Measurement Results ◽  
Transition Structures ◽  
Coupled Structures ◽  
Better Than ◽  
Good Agreement

AbstractIn this paper, a balanced-to-balanced (BTB) branch-slotline directional coupler (DC) is firstly presented, which can realize an arbitrary power division ratios (PDRs). The coupler is composed by microstrip-to-slotline (MS) transition structures and branch-slotline coupled structures. The single-ended to balanced-ended conversion is simplified and easy to implemented by the MS transition structures, which intrinsically leads to the differential-mode (DM) transmission and common-mode (CM) suppression. Moreover, the different PDRs which are controlled by the widths of branch-slotlines can be achieved. In order to verify the feasibility of the proposed design method, two prototype circuits of the proposed coupler with different PDRs are fabricated and measured. The return loss and the isolation of two designs are all better than 10 dB. Moreover, the CM suppressions are greater than 35 dB. A good agreement between the simulation and measurement results is observed.

scholarly journals Sharp Skirt Dual-Mode Bandpass Filter with Overlay Plate to Control Upper Passband Edge

2019 ◽  
Vol 8 (6) ◽  
pp. 2357-2360
Keyword(s):  
Analytical Model ◽  
Insertion Loss ◽  
Return Loss ◽  
Bandpass Filter ◽  
Center Frequency ◽  
Dual Mode ◽  
Rf Receivers ◽  
Attenuation Level ◽  
Frequency Selective ◽  
Fixed Center

This paper presents design and analytical model for Sharp Skirt Dual-Mode Bandpass Filter for RF receivers. Proposed filter is designed using open stub loaded H shaped resonator. Based on analytical model insertion loss S21 and return loss S11 for proposed filter are demonstrated. Inductive Overlaying plate is proposed to control upper passband edge of proposed filter to improve frequency selectivity with fixed center frequency. The proposed filter has sharp frequency selective range from 5.1GHz to 9.2GHz. With overlay plate, frequency selective range is tuned to 5.1GHz-8.6GHz. Without overlaying plate the proposed filter has return loss greater than 10dB and insertion loss of 0.7dB. Lower and upper passband edges are at 5.1GHz and 9.2GHz with attenuation level of 52dB and 54dB respectively. With overlaying plate, the filter has same S 11 and S 21 parameters, but upper passband edge is shifted from 9.2GHz to 8.6GHz

Coupled microstrip filters on multilayered dielectric media

2002 ◽  
Vol 80 (6) ◽  
pp. 675-685
Author(s):  
Ar. Koufogiannidis ◽  
K Siakavara
Keyword(s):  
Frequency Response ◽  
Transmission Lines ◽  
Insertion Loss ◽  
Design Procedure ◽  
Multiconductor Transmission Lines ◽  
Microstrip Lines ◽  
Dielectric Media ◽  
Microstrip Filters ◽  
Loss Method ◽  
Good Agreement

The work presented in this paper is an attempt to design filters with coupled microstrip lines on multilayered dielectric media using methods employed in other applications. A procedure was formulated for designing filters with the desired frequency response and smaller size using insertion loss method combined with the theory of multiconductor transmission lines. The frequency response was verified by considering that the filters act as cascaded four-port networks. The results were in a very good agreement with those expected from the theoretically design procedure. PACS No.: 84.40D

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.

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