Wideband Highly-Selective Bandpass Filtering Branch-Line Coupler

Barik, Rusan Kumar; Koziel, Slawomir; Szczepański, S.

doi:10.1109/access.2022.3152802

Cited by 11 publications

(5 citation statements)

References 33 publications

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“…The obtained results in [50] demonstrate a smaller than 0.5 dB insertion loss and a better than 15 dB output ports isolation and return loss parameters in a wide working band of 2.5 GHz.…”

Section: Introductionmentioning

confidence: 82%

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A Compact Microwave Quadrature Hybrid Coupler Using Capacitive Composite Lines and Meandered Stubs

Roshani,

Yahya,

Assaad

et al. 2023

Symmetry

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In this paper, a new structure of the quadrature hybrid coupler (QHC) with compact size is proposed using capacitive composite lines and meandered open stubs. The proposed coupler works at 1.6 GHz with a 0.4 GHz bandwidth, which shows 25% fractional bandwidth (FBW). The proposed QHC occupies only 15 mm × 15 mm (0.12 λ × 0.12 λ), while the typical QHC size is 32 mm × 32 mm (0.25 λ × 25 λ) at the same working frequency. In the designed structure, two symmetric meandered stubs and two symmetric π-shaped composite networks including capacitors and microstrip lines are applied together. The designed QHC has a small size and occupies only 22% of the area of the conventional QHC, resulting in a 78% size reduction. The designed prototype has been analyzed, fabricated and tested, and the experimental results verify the simulated and analysis results. The results show a better than 27 dB return loss, more than 28 dB isolation between the output ports and less than 0.4 dB insertion loss at the working frequency of 1600 MHz. With the achieved desirable specifications, the fabricated QHC is a suitable choice for wireless microwave applications.

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“…The obtained results in [50] demonstrate a smaller than 0.5 dB insertion loss and a better than 15 dB output ports isolation and return loss parameters in a wide working band of 2.5 GHz.…”

Section: Introductionmentioning

confidence: 82%

“…In [50], a filtering coupler with broadband response and highly selectivity is presented. In this structure, an open stub and coupled line are applied tighter at each port, achieving excellent selectivity and a broad operating bandwidth.…”

Section: Introductionmentioning

confidence: 99%

A Compact Microwave Quadrature Hybrid Coupler Using Capacitive Composite Lines and Meandered Stubs

Roshani,

Yahya,

Assaad

et al. 2023

Symmetry

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show abstract

“…Considering the classical theory of transmission lines and their excitation modes [30,31,32], and using expressions (5), ( 8) and (12), it is possible to establish the transformation matrices and obtain the frequency response for the reflection (S 11 ) and transmission (S 21 ) scattering parameters on the ports of the layout based on the admittances of each mode. Considering a RO3006 dielectric substrate with ε r = 6.15, tan δ = 0.0024, h = 1.52 mm, Z 1 = Z 2 = Z a = 90.0 O (Y a = 0.0111 S), Z 3 = 50.0 O (Y 3 = 0.02 S), f 0 = 0.60 GHz and a C v capacitance of 4.0 pF, Fig 3 shows the typical frequency responses for the TBSF model obtained via numerical simulation in the ADS circuit analysis software and calculation based on the development of expressions ( 5) and (8).…”

Section: Study Of Input Admittancesmentioning

confidence: 99%

“…Recently, several models of filters with wideband and multiband frequency response have been developed [4][5][6][7]. It is common to use coupled line topologies [8], multiple transmission poles and zeros [9], stepped-impedance resonators (SIR) [10] and classical geometries (square/ split-ring) [11]. In [12] a bandstop filter with high frequency selective response is presented.…”

Section: Introductionmentioning

confidence: 99%

A new tunable bandstop filter square-ring resonator using varactor diodes

Duarte Júnior,

da Silva Neto,

Gomes d’Assunção

2023

PLoS ONE

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This work presents the development of a bandstop filter with a tunable response. Varactor diodes are used as control elements. Studies and investigations demonstrate the influence of the variable capacitance on the input admittance and on the S-parameters frequency responses of the proposed square-ring resonator geometry. The design of the square-ring resonator is based on mathematical modeling of ideal transmission lines, considering parameters of characteristic admittance and electrical length for odd and even excitation modes. Based on S-parameters in ports, an equivalent circuit model of the resonator geometry is presented. The corresponding results are compared with numerical simulations. Comparative analyses are presented in order to guide the process of optimizing the physical dimensions of the layout. A prototype with dimension 0.0272 λg2 was designed, fabricated, and tested. As a measured result, a filter with two rejection bands was obtained, the first at 0.6–1.15 GHz and the second at 1.71–2.28 GHz, with 63.0 and 29.0% tuning range, respectively. In comparison with bandstop filters from the literature, the proposed reconfigurable filter presents a larger tuning range for the first band, sufficient inband rejection levels for several applications, and reduced physical dimensions. The proposed configuration is an attractive reconfigurable filtering device for use in modern communication systems operating below 3.0 GHz.

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“…Coupled lines can also be used to suppress harmonics in BLCs [8][9][10][11][12][13]. For example, in [8], a compact BLC with harmonic rejection using T-shaped coupled lines was presented.…”

Section: Introductionmentioning

confidence: 99%

An Ultra Compact Microstrip Branch Line Coupler with Wide Stopband Using LCL Filter and Meandered Stubs for Microwave Applications

Chaudhary

Roshani

2023

Processes

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A branch line coupler (BLC) with ultra-compact size and harmonic suppression ability using an LCL filter and meandered stubs is proposed in this paper. There are some important factors in microstrip coupler design, including size reduction, harmonic suppression, and low insertion loss. Thus, improving each of these factors will contribute to a more efficient design. In the proposed circuit, for the first time, LCL filters, including four T-shaped circuits and four meandered line open-ended stubs, were used together to reduce the circuit size and suppress unwanted harmonics. The proposed LCL filters, incorporated in the BLC branches, resulted in superior size reduction and harmonic suppression for the presented BLC. The proposed BLC correctly worked at 900 MHz with 300 MHz operating bandwidth, which showed 33% fractional bandwidth (FBW). Additionally, a wide suppression band from 1.4 GHz to 8.8 GHz, with more than 20 dB attenuation level was obtained, which suppressed the second to ninth unwanted harmonics. The overall size of the proposed 900 MHz coupler was only 11 mm × 10.4 mm (0.044 λ × 0.042 λ) while the size of the conventional 900 MHz coupler was 61.5 mm × 62.5 mm (0.25 λ × 25 λ). The proposed BLC had a very small size and only occupied 3% of the size of the conventional coupler, which corresponded to a 97% size reduction. To the best of the authors’ knowledge, to date, the best size reduction has been obtained among the published couplers. Furthermore, the experimental results verified the simulated and analyzed results of the proposed technique and demonstrate its potential for improving the performance and miniaturizing the size of other similar BLCs.

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Wideband Highly-Selective Bandpass Filtering Branch-Line Coupler

Cited by 11 publications

References 33 publications

A Compact Microwave Quadrature Hybrid Coupler Using Capacitive Composite Lines and Meandered Stubs

A Compact Microwave Quadrature Hybrid Coupler Using Capacitive Composite Lines and Meandered Stubs

A new tunable bandstop filter square-ring resonator using varactor diodes

An Ultra Compact Microstrip Branch Line Coupler with Wide Stopband Using LCL Filter and Meandered Stubs for Microwave Applications

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