Design of a Filtering Power Divider with Simple Symmetric Structure Using Stubs

Roshani, Sobhan; Yahya, Salah I.; Rastad, Jamal; Mezaal, Yaqeen S.; Liu, Louis Wy; Roshani, Sobhan

doi:10.3390/sym14101973

Cited by 4 publications

(3 citation statements)

References 40 publications

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“…The equivalent circuit diagram of the symmetrical three-port network is shown in Figure 2. Here, we use the odd-even mode analysis method [38] to analyze the circuit, which can greatly simplify the analysis [39]. The odd and even mode admittances of the network at the reference plane t 1 are given by [34].…”

Section: Impedance-transforming Sectionmentioning

confidence: 99%

Compact-Transmission-Line Decoupling and Matching Network of Three-Element Array for Wireless Applications

Zhang

Jiao

2023

Electronics

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In this paper, a compact-transmission-line (TL) decoupling and matching network (DMN) for three-element circular arrays is presented. As a result of the miniaturization of wireless terminals, the antenna spacing is too close, leading to large couplings and deteriorating system performance. The DMN consists of an impedance transformation section and a star-shaped neutralization section which eliminates couplings between antennas while occupying a smaller area. The impedance transformation section converts the odd and even mode conductances of the antenna to the impedance of the feeding line, and the neutralization section eliminates the odd and even mode susceptances to complete the decoupling and matching of the antenna. The star-shaped circuit utilizes the area surrounded by the antennas in a more efficient manner than traditional triangle circuits. This facilitates the folding of the TL and the miniaturization of the circuit. A design formula is given for each module of the circuit after it has been analyzed analytically. A decoupling example is simulated and manufactured with the diameter of the area occupied by the DMN less than a quarter wavelength. At the working frequency, the port isolation is increased from 7.6 dB to 33.5 dB. The ECC between ports is reduced from 0.11 to 0.011, which validates the method proposed.

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Section: Impedance-transforming Sectionmentioning

confidence: 99%

Compact-Transmission-Line Decoupling and Matching Network of Three-Element Array for Wireless Applications

Zhang

Jiao

2023

Electronics

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“…A rat-race coupler with an LPF structure, compact size and high isolation was presented in 25 . Recently, several techniques and topologies for designing filtering power dividers, such as squared resonator based on artificial intelligence 26 , 27 , microstrip open and short stubs 28 , high/low impedance ring resonators 29 , 40 , 42 , open complementary split-ring resonator 30 , capacitor loading 31 , square-loop resonator and meandered stubs 32 , parallel strip line and DGS 34 , hexagonal shaped resonator and multi open stubs 35 , radial resonator and multi open stubs 36 , 37 and microstrip electromagnetic bandgap element 43 have been reported. However, a modified WPD with LPF structure and high isolation has been presented in 44 , the footprint is a bit large.…”

Section: Introductionmentioning

confidence: 99%

A Wilkinson power divider with harmonic suppression through low-pass filter for GSM and LTE applications

Mohammadi,

Moloudian,

Roshani

et al. 2024

Sci Rep

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Conventional Wilkinson power dividers (WPDs) perform satisfactorily near the intended operation frequency. Nonetheless, these WPDs demonstrate subpar performance in the stopband and necessitate a significant physical space. To enhance the existing level of advancement and in order to improve on the current state-of-the-art, a modified WPD is designed and fabricated, demonstrating a significant improvement in stopband and superior isolation between output ports. To improve the stopband and suppress unwanted harmonics, a low-pass filter (LPF) structure is placed in the both branches of the conventional WPD. The proposed modified WPD depicts a wide stopband bandwidth (fSB > 17.25 GHz) from 2.75 to over 20 GHz with an attenuation level of 20 dB, suppressing 2nd to 11th harmonics. According to measured results, the input return loss (|S11|), insertion loss (|S21|) and output isolation (|S32|) at f = 1.8 GHz are better than 33 dB, 3.2 dB and 21 dB, respectively. Indeed, the proposed modified WPD exhibits a magnitude imbalance of 0.00018, a phase imbalance of 1.25 degrees and a group delay of 0.5 ns. The proposed WPD depicts a compact size of 35 mm × 25 mm (0.38 λg × 0.27 λg), where λg is the guided wavelength at f = 1.8 GHz. There is a good agreement between the simulated and measured results. According to the obtained results, the proposed modified WPD shows a desirable performance for modern LTE and GSM communication applications.

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“…Microstrip devices play a crucial role in RF communication systems as they allow for the miniaturization, integration, and cost-effective realization of various components such as filters, couplers, power dividers, and antennas [1][2][3][4]. Since microstrip couplers have been in wide-spread demand for modern wireless communication systems, several novel types have been reported recently.…”

Section: Introductionmentioning

confidence: 99%

A Balanced Symmetrical Branch-Line Microstrip Coupler for 5G Applications

Yahya,

Zubir,

Nouri

et al. 2023

Symmetry

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Symmetry in designing a microstrip coupler is crucial because it ensures balanced power division and minimizes unwanted coupling between the coupled lines. In this paper, a filtering branch-line coupler (BLC) with a simple symmetrical microstrip structure was designed, analyzed and fabricated. Based on a mathematical design procedure, the operating frequency was set at 5.2 GHz for WLAN and 5G applications. Moreover, an optimization method was used to improve the performance of the proposed design. It occupied an area of 83.2 mm2. Its harmonics were suppressed up to 15.5 GHz with a maximum level of −15 dB. Meanwhile, the isolation was better than −28 dB. Another advantage of this design was its high phase balance, where the phase difference between its output ports was 270° ± 0.1°. To verify the design method and simulation results, the proposed coupler was fabricated and measured. The results show that all the simulation, design methods, and experimental results are in good agreement. Therefore, the proposed design can be easily used in designing high-performance microstrip-based communication systems.

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Design of a Filtering Power Divider with Simple Symmetric Structure Using Stubs

Cited by 4 publications

References 40 publications

Compact-Transmission-Line Decoupling and Matching Network of Three-Element Array for Wireless Applications

Compact-Transmission-Line Decoupling and Matching Network of Three-Element Array for Wireless Applications

A Wilkinson power divider with harmonic suppression through low-pass filter for GSM and LTE applications

A Balanced Symmetrical Branch-Line Microstrip Coupler for 5G Applications

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