Design and fabrication of a miniaturized lowpass-bandpass diplexer with wide tuning range and high isolation

Rayatzadeh, Sadegh; Moloudian, Gholamhosein

doi:10.1080/09205071.2019.1649604

Cited by 13 publications

(5 citation statements)

References 28 publications

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“…With the rapid growth of technology in recent decades, the need to expand and upgrade wireless communication devices has increased dramatically. According to modern comprehensive needs to improve quality and the need for higher speed in wireless communication, special attention has been paid to increasing the quality and upgrading active and passive microwave devices such as antennas 1 – 5 , filters 6 – 18 , multiplexers 19 – 24 , and power dividers 25 – 44 . Power divider plays a vital role in modern microwave devices.…”

Section: Introductionmentioning

confidence: 99%

“…The demand for multi-port components, such as diplexers 19 – 24 and power dividers 25 – 44 has been experiencing significant growth in contemporary communication systems. Indeed, by integrating filters with power dividers and diplexers, more desirable features such as increasing the stopband, improving suppression bandwidth to eliminate unwanted harmonics and reducing the size and footprint can be achieved.…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Introductionmentioning

confidence: 99%

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

Self Cite

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show abstract

“…Although this circuit removed the requirement of additional circuit line, isolation and circuit size were not good enough. In [4] and [5], lowpass-bandpass diplexers have been reported by using conventional design methods at lowpass channel, and only one transmission pole can be obtained in the bandpass channels. In these studies, selectivity of the bandpass channels is not good enough, and they also suffer from large circuit size and low isolation.…”

Section: Introductionmentioning

confidence: 99%

Design of a Compact Lowpass-Bandpass Diplexer With High Isolation

Elden¹,

Görür²

2021

PIER Letters

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In this paper, a novel compact lowpass-bandpass microstrip diplexer with high isolation is proposed. The proposed structure consists of a lowpass filter section and a bandpass filter section. The lowpass filter section is designed at a cutoff frequency of 2 GHz with sixth order elliptic filtering characteristics. The bandpass filter section is designed at 3.5 GHz by using a meandered dual-mode loop resonator (MDMLR). The MDMLR is coupled to input port by open circuited feeding lines. The lowpass-bandpass diplexer is formed by combining lowpass and bandpass filter sections without using an additional matching circuit. The designed lowpass-bandpass diplexer has been fabricated and measured in a very good agreement with the simulated results. Isolation between the output ports has been measured as better than 40 dB.

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“…In References 24 and 25, a compact power divider with a split ring resonator is suggested. Moreover, in References 27–31, the LC equivalent circuit for filters is presented. A suitable method for harmonics suppression based on LC harmonic‐trapped filters is presented in References 32 and 33.…”

Section: Introductionmentioning

confidence: 99%

Modified Wilkinson power divider with harmonics suppression and compact size for GSM applications

Moloudian

Rostami

Björninen

2020

Int J RF Microw Comput Aided Eng

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In this article, a modified microstrip Wilkinson power divider with harmonics suppression for GSM communications applications is presented. For low‐pass filter designing, one open stub, one radial resonator, and two rectangular resonators are used. According to results related to insertion losses (|S21| and |S31|), stopband is wide and equal to 7.5 GHz (3.4‐10.9 GHz), under the condition of 20 dB harmonic suppression level. The results show that at the designed frequency of 1.8 GHz, the input return loss (|S11|) and output return losses (|S22| and |S33|) are better than 22 dB, and the isolation between of output ports (|S32|) is better than 30 dB. The size of the proposed power divider is compact and equal to 10.6 × 14.6 mm2. Finally, the proposed power divider was fabricated and the measurement results illustrate a good agreement with simulation results.

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Design and fabrication of a miniaturized lowpass-bandpass diplexer with wide tuning range and high isolation

Cited by 13 publications

References 28 publications

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

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

Design of a Compact Lowpass-Bandpass Diplexer With High Isolation

Modified Wilkinson power divider with harmonics suppression and compact size for GSM applications

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