A highly selective UWB bandpass filter using stepped impedance stubs

AbstractWe present a new ultra-wideband (UWB) band-pass filter (BPF) configuration with a stepped impedance short-circuited stub (SISS)-loaded triple-mode resonator (TMR) and stepped impedance radial stub (SIRS). The novel SISS-loaded TMR and SIRS improve the roll-off ratio at both ends. Even though this UWB BPF is based on a single resonator, the measured results show excellent in-band performance with a small insertion loss less than 0.6 dB and return loss greater than −16 dB. The proposed UWB BPF has sharp roll-off ratio of 96 and 43 dB/GHz, respectively, at the lower and upper edges of the pass-band, and a wide stop-band from 10.8 to 15.6 GHz with the rejection greater than 20 dB.

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A Novel Three-Port Combiner Based on Coaxial Cavity

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.605-607.1924 ◽

2012 ◽

Vol 605-607 ◽

pp. 1924-1928

Author(s):

Su Nan Zhang ◽

Qiang Ye ◽

Chang Wei Luo

Keyword(s):

Return Loss ◽

Ultra Wideband ◽

Band Pass Filter ◽

The Novel ◽

Pass Filter ◽

Coaxial Cavity ◽

Transmission Zero ◽

Band Stop Filter ◽

Band Pass ◽

Good Agreement

In this paper, a novel three-port combiner based on coaxial cavity is presented, which consists of a band-pass filter with a transmission zero and a ultra-wideband band-stop filter, and the combiner is different to the conventional combiner based on microstrip or stripline. The design and simulated results show that the novel combiner has a good performance, which are insert loss more than -0.5dB and return loss less than -20dB between the GSM/DCS/TD band (800-2170MHz) and WLAN band (2400-2500MHz), the isolation in both bands less than -85dB, respectively. In addition, the performances of the novel combiner are demonstrated experimentally, the measured results have good agreement with simulated results.

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

International Journal of Microwave and Wireless Technologies ◽

10.1017/s1759078718000041 ◽

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.

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Design of UWB Filter with WLAN Notch

International Journal of Antennas and Propagation ◽

10.1155/2012/971097 ◽

2012 ◽

Vol 2012 ◽

pp. 1-4 ◽

Cited By ~ 3

Author(s):

Harish Kumar ◽

MD. Upadhayay

Keyword(s):

Circuit Simulation ◽

Ground Plane ◽

Stop Band ◽

Simulation Software ◽

Pass Band ◽

Area Network ◽

Band Pass Filter ◽

Frequency Range ◽

Pass Filter ◽

Band Pass

UWB technology- (operating in broad frequency range of 3.1–10.6 GHz) based filter with WLAN notch has shown great achievement for high-speed wireless communications. To satisfy the UWB system requirements, a band pass filter with a broad pass band width, low insertion loss, and high stop-band suppression are needed. UWB filter with wireless local area network (WLAN) notch at 5.6 GHz and 3 dB fractional bandwidth of 109.5% using a microstrip structure is presented. Initially a two-transmission-pole UWB band pass filter in the frequency range 3.1–10.6 GHz is achieved by designing a parallel-coupled microstrip line with defective ground plane structure using GML 1000 substrate with specifications: dielectric constant 3.2 and thickness 0.762 mm at centre frequency 6.85 GHz. In this structure aλ/4 open-circuited stub is introduced to achieve the notch at 5.6 GHz to avoid the interference with WLAN frequency which lies in the desired UWB band. The design structure was simulated on electromagnetic circuit simulation software and fabricated by microwave integrated circuit technique. The measured VNA results show the close agreement with simulated results.

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Digital Stable IIR Band Pass Filter Design Using Seeker Optimization Technique

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.905.406 ◽

2014 ◽

Vol 905 ◽

pp. 406-410 ◽

Cited By ~ 2

Author(s):

S.K. Saha ◽

Rajib Kar ◽

D. Mandal ◽

S.P. Ghoshal

Keyword(s):

Filter Design ◽

Fitness Function ◽

Stop Band ◽

Infinite Impulse Response ◽

Pass Band ◽

Band Pass Filter ◽

Pass Filter ◽

Iir Filter ◽

Real Coded Genetic Algorithm ◽

Band Pass

This paper presents a novel, control parameter independent evolutionary search technique known as Seeker Optimization Algorithm (SOA) for the design of a eighth order Infinite Impulse Response (IIR) Band Pass (BP) filter. A new fitness function has also been adopted in this paper to improve the stop band attenuation to a great extent. The performance of the SOA based IIR BP filter design has proven to be much superior as compared to those obtained by real coded genetic algorithm (RGA) and standard particle swarm optimization (PSO) in terms of highest sharpness at cut-off, smallest pass band ripple, highest stop band attenuation, smallest stop band ripple and also the fastest convergence speed with assured stability recognized by the pole-zero analysis of the designed optimized IIR filter.

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Circular-shaped differential wideband band pass filter

International Journal of Microwave and Wireless Technologies ◽

10.1017/s1759078719001284 ◽

2019 ◽

Vol 12 (3) ◽

pp. 193-197

Author(s):

Dharmendra Kumar Jhariya ◽

Akhilesh Mohan ◽

Rahul Kaushik ◽

Vishal Narain Saxena

Keyword(s):

Close Agreement ◽

Stop Band ◽

Symmetry Plane ◽

Pass Band ◽

Band Pass Filter ◽

Differential Mode ◽

Common Mode ◽

Pass Filter ◽

Band Pass

AbstractThe design of a circular-shaped differential wideband band pass filter (BPF) is described. The proposed filter is compact and provides good common mode (CM) suppression. It consists of four ports with a circular-shaped differential mode (DM). The analysis of the filter has been carried out by bisecting it into identical two-port networks along the symmetry plane, resulting in a band stop or band pass response under CM or DM excitations, respectively. The length and width of the stubs can be tuned to obtain the desired pass band and stop band of the differential BPF. The proposed design is fabricated and measured. The results obtained using measurements are in close agreement with those obtained using simulations.

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Compact, Reflectionless Band-Pass Filter: Based on GaAs IPD Process for Highly Reliable Communication

Electronics ◽

10.3390/electronics10232998 ◽

2021 ◽

Vol 10 (23) ◽

pp. 2998

Author(s):

Xiaozhen Li ◽

Mengjiang Xing ◽

Gan Liu ◽

Xiaodong Yang ◽

Chuanxiang Dai ◽

...

Keyword(s):

Electromagnetic Interference ◽

Return Loss ◽

Stop Band ◽

Band Pass Filter ◽

Wearable Electronics ◽

Pass Filter ◽

Compact Size ◽

Band Pass ◽

Band Signal ◽

Good Agreement

For highly reliable and compact communication of front-end modules, a miniaturized reflectionless band-pass filter, based on the GaAs integrated passive device (IPD) process, is proposed in this work. The stop-band signal absorption rate of the filter can reach more than 90% and greatly reduce the influence of electromagnetic interference for sensitive devices. First, a circuit topology of reflectionless filter is proposed. Then, the miniaturized reflectionless band-pass filter is designed and fabricated based on GaAs IPD process with a compact size of only 0.85 mm × 1.33 mm × 0.09 mm (0.011λ × 0.018λ × 0.001λ). The filter operates at frequency ranging from 3.3 GHz to 4.5 GHz for 5G communication, the insertion loss (S21) is less than 3 dB, the return loss in the passband (S11) is over 15 dB, the stopband return loss (S11) is over 10 dB, and the out-of-band suppression (S21) reached 19 dB. All the measured results are in good agreement with the simulated results. It shows great potential in the process of designing highly reliable and compact monolithic integrated wireless modules and wearable electronics.

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Compact multiple electromagnetic band gap (EBG) cells based ultra wide band (UWB) filter with improved stop-band characteristics

Circuit World ◽

10.1108/cw-11-2019-0169 ◽

2021 ◽

Vol ahead-of-print (ahead-of-print) ◽

Author(s):

Masood Molimoli Hajamohideen ◽

Sreeja Balakrishanapillai Suseela

Keyword(s):

Stop Band ◽

Wide Band ◽

Ultra Wide Band ◽

Pass Band ◽

Band Pass Filter ◽

Frequency Range ◽

Pass Filter ◽

Electromagnetic Band Gap ◽

Content Type ◽

Band Pass

Purpose The purpose of the study is – in Microwave filter design, the performances of passive components are deteriorated by parasitics at gigahertz (GHz) frequency range. A compact and multi-stack electromagnetic band gap (EBG) structure is proposed with improved stop band characteristics at GHz frequency range in this work. This paper proposes a new design for ultra wide band pass filter (resonator BPF) with periodically loaded one-dimensional EBG to achieve the harmonic suppression. This basic EBG structure is developed with combination of a signal strip and ground plane in the slotted section. The resonator BPF is loaded with one EBG, two EBG and three EBGs to improve the stop-band rejection. Design/methodology/approach The proposed filter is with multi-stack EBG cell for achieving good pass band and stop bands performance. Circuit model is analyzed in Section 2. Section 3 discuses band pass filter loaded with one EBG. In Sections 4 and 5, filter with two and three EBG loaded resonators are discussed, respectively. Section 6 is concluded with comparison of simulation and measured results. Findings The stop-band rejection is 20 dB, 40 dB and 50 dB, respectively, in the frequency range of 6 GHz to 20 GHz. The simulation analysis is carried out with advanced system design software. To validate the simulation results, proposed structure is fabricated, and results are found to be in good agreement. Originality/value This paper accounts for designing resonator BPF, which has slow wave pass band and stop band characteristics. Second and third harmonics are suppressed using multi-stack EBG. Various stacks with basic designs are proposed and improved results have been demonstrated which is open for future research.

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Design and Realization of a Compact High-Frequency Band-Pass Filter with Low Insertion Loss Based on a Combination of a Circular-Shaped Spiral Inductor, Spiral Capacitor and Interdigital Capacitor

Electronics ◽

10.3390/electronics7090195 ◽

2018 ◽

Vol 7 (9) ◽

pp. 195 ◽

Cited By ~ 3

Author(s):

Ki-Hun Lee ◽

Eun-Seong Kim ◽

Jun-Ge Liang ◽

Nam-Young Kim

Keyword(s):

Insertion Loss ◽

Return Loss ◽

Bandpass Filter ◽

Center Frequency ◽

Spiral Inductor ◽

Band Pass Filter ◽

Pass Filter ◽

Interdigital Capacitor ◽

In Series ◽

Band Pass

In this study, the proposed bandpass filter (BPF) connects an interdigital and a spiral capacitor in series between the two symmetrical halves of a circular intertwined spiral inductor. For the mass production of devices and to achieve a higher accuracy and a better performance compared with other passive technologies, we used integrated passive device (IPD) technology. IPD has been widely used to realize compact BPFs and achieve the abovementioned. The center frequency of the proposed BPF is 1.96 GHz, and the return loss, insertion loss and transmission zero are 26.77 dB, 0.27 dB and 38.12 dB, respectively. The overall dimensions of BPFs manufactured using IPD technology are 984 × 800 μ m 2 , which is advantageous for miniaturization and integration.

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Design of Dual-Band Dual-Mode Band-Pass Filter Utilizing 0° Feed Structure and Lumped Capacitors for WLAN/WiMAX Applications

Electronics ◽

10.3390/electronics9101697 ◽

2020 ◽

Vol 9 (10) ◽

pp. 1697

Author(s):

Ahmed A. Ibrahim ◽

Wael A. E. Ali ◽

Mahmoud A. Abdelghany

Keyword(s):

High Selectivity ◽

Stop Band ◽

Dual Band ◽

Pass Band ◽

Area Network ◽

Band Pass Filter ◽

Pass Filter ◽

Band Region ◽

Compact Size ◽

Band Pass

Two dual-band second-order highly selective band pass filters operated at 3.5/5.5 GHz and 3.5/6 GHz for wireless local area network /worldwide interoperability for microwave access WLAN/WiMAX applications are introduced in this paper. The designed filters are inspired of utilizing two coupled open-loop resonators loaded with stub, spiral resonators and lumped capacitors. The filters are designed based on calculating the desired coupling matrix and the external quality factor. The first and the second filters are designed at the fundamental mode of 3.5 GHz then the first filter is loaded with two spiral resonators in the microstrip line to produce the desired band stop behaviour, which in turn achieves the second pass-band. However, the second band of the second filter is achieved by loading the stub with the lumped capacitors, which controls the second mode. The centre frequency of the second band is adjusted by varying the lumped capacitors values. The two designed filters have insertion loss less than 0.7 dB in the pass-band region, high selectivity with more than 4 transmission zeros and more than 20 dB attenuation level in the stop band region. The suggested filter has compact size and high selectivity with tunability behavior. The two filters are fabricated and measured to validate the simulated results.

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