Design of Compact UWB Filter Using Parallel-coupled Line and Circular Open-circuited Stubs

Ramanujam, P.; Chandrasekar, A.; G, Ramesh Venkatesan P; Ponnusamy, Manimaran

doi:10.1080/03772063.2020.1803772

Cited by 14 publications

(8 citation statements)

References 18 publications

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“…On the one hand, open-circuited stubs are used to design BPF [56,57], and on the other hand, open stubs can be used for band-stop filters [58,59]. Furthermore, the open-circuited stubs can also be quarter-wavelength [60,61]. Therefore, the proposed filter's topology mixes both configurations with the electric length λ/4, as shown in Figure 1.…”

Section: Filter Structure and Methodologymentioning

confidence: 99%

Tri-Band Bandpass Filter Using Mixed Short/Open Circuited Stubs and Q-Factor With Controllable Bandwidth for Was, Ism, and 5g Applications

Massamba¹,

Mpele²,

Mbango³

2022

PIER C

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Designing a multi-band bandpass filter (BPF) with controllable bandwidths is an alternative process to several technologies suggested by researchers. Hence, this paper presents a tri-band BPF in microstrip technology where T-shaped short-and-open stubs have alternating positions to use the maximally flat theory, based on the overall ABCD parameters of the circuit. The combination of the design Q-factor and operating frequency to mismatch the design is the technique basis. The proposed structure comprises quarter wavelength (λ/4) line section to develop a tri-band BPF frequency. All stubs are symmetrical relative to the center axis, while the prototype has been fabricated on a wafer of 22.42 × 7.62 mm 2 . Using an FR4 HTG-175 with a thickness 1-mm, dielectric constant ε r = 4.4, and loss tangent tan δ = 0.02, the (4.06-4.283) GHz, (5.877-6.408) GHz,) GHz are obtained referring to a 10-dB of the return loss. In contrast, the insertion losses at the center frequencies are 2.107/1.354/4.08 dB and the fractional bandwidths of 2.134%, 5.346%, and 8.645%, respectively. This covers WAS (including RLAN), ISM, and 5G applications. However, the attenuation coefficient is between 1.326 dB and 4.368 dB. The tri-band BPF prototype was validated using the Anritsu MS4642B 20 GHz Vector Network Analyzer. The measured and E-simulated results have been compared with good agreement.

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Section: Filter Structure and Methodologymentioning

confidence: 99%

Tri-Band Bandpass Filter Using Mixed Short/Open Circuited Stubs and Q-Factor With Controllable Bandwidth for Was, Ism, and 5g Applications

Massamba¹,

Mpele²,

Mbango³

2022

PIER C

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“…Compared with other filter designs, the filter has the following advantages in physical processing: no complicated processing technology is required, no drilling is required, and the dimensional accuracy of the board design is after one decimal point. The UWB filter designed in this manuscript is compared with the [3,5,[33][34][35][36][37][38][39][40][41][42][43][44], and the results are shown in Table 6. As can be seen from the second column of Table 6, the filter in this paper is different from others in structure, it adopts the improved ACPW-DGS.…”

Section: Testing and Verificationmentioning

confidence: 99%

Design of double-notch UWB filter with upper stopband characteristics based on ACPW-DGS

Gao

Zhang²,

Chen

et al. 2023

PLoS ONE

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In this manuscript, a compact (size only 9.8mm*9.8mm) Ultra Wide Band (UWB) bandpass filter with a new structure is proposed, which can be used in the UWB wireless communication band authorized by the FCC. The top plane is composed of a pair of back-to-back microstrip lines, and the ground plane structure is based on an asymmetric coplanar waveguide-defect ground structure (ACPW-DGS). UWB is formed by the vertical electromagnetic coupling of the top plane and the ground plane. On this basis, split ring resonator (SRR) and C type resonator (CTR) are utilized to place double notch bands. A novel third order nested C-type resonator (TONCTR) is obtained by performing CTR, which can further optimize the upper stopband while ensuring double notch bands. The filter can be used for filtering within the UWB system, and it can also avoid the amateur radio band (9.2 -10.3GHz) and the X-band satellite link band (9.6-12.3GHz) on UWB communication systems. Finally, the measured results from the fabricated prototype are basically consistent with the simulation results.

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“…Theses filters exhibit enhanced selectivity and controllable resonant modes/transmission zeros, but the problem of high IL, low FBW, and larger circuit dimensions are associated with the proposed topologies. Recently, UWB filters have been reported with good FBW and IL using MMRs in [ 14 – 16 ], high selectivity using fractal tree stub loaded MMR in [ 17 , 18 ], respectively. After that several techniques have been reviewed and implemented in the design of UWB filters with multiple stopband characteristics using different resonator topologies i.e., single stopband frequency in [ 19 , 20 ], dual notch implementation using CPW (coplanar waveguide), step impedance resonator (SIR) technique in [ 21 – 23 ], and triple notch bands implementation with complex structures in [ 24 , 25 ], respectively.…”

Section: Introductionmentioning

confidence: 99%

Miniaturized ultra-wideband filter with independently controlled notch bands for 5.1/6/8 GHz wireless applications

et al. 2022

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A novel three-mode step impedance resonator (TSIR) is developed to design a miniaturized multi-pole microstrip planar ultra-wideband (UWB) filter with independently controlled notched bands at different frequencies is presented in this work. The basic UWB filter consists of four L-shaped λ/4 short-circuited stubs operating in the range of i.e. 2.7 to 12.1 GHz with fractional bandwidth (FBW) 127%, and the TSIR is constructed using two T-shaped λ/2 open ended step impedance resonator (SIR) and one λ/4 short-circuited uniform impedance resonator (UIR) is coupled to the basic UWB design in order to achieve the stopbands performance at 5.1 GHz, 6 GHz, and 8 GHz, to supress the unwanted bands of WLAN, Wi-Fi 6E, and X-band satellite communication system, respectively. Commercial full-wave electromagnetic (EM) software HFSS-13 was used to design an ultra-compact structure having size 0.07 λg×0.02 λg on Rogers RT/Duroid 5880 substrate to justify good agreement between simulated and measured S-parameters.

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Design of Compact UWB Filter Using Parallel-coupled Line and Circular Open-circuited Stubs

Cited by 14 publications

References 18 publications

Tri-Band Bandpass Filter Using Mixed Short/Open Circuited Stubs and Q-Factor With Controllable Bandwidth for Was, Ism, and 5g Applications

Tri-Band Bandpass Filter Using Mixed Short/Open Circuited Stubs and Q-Factor With Controllable Bandwidth for Was, Ism, and 5g Applications

Design of double-notch UWB filter with upper stopband characteristics based on ACPW-DGS

Miniaturized ultra-wideband filter with independently controlled notch bands for 5.1/6/8 GHz wireless applications

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