Miniaturized Harmonic Suppressed Wilkinson Power Divider using Lumped Components and Resonators
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Miniaturized Harmonic Suppressed Wilkinson Power Divider using Lumped Components and Resonators Masoud Heydari1 · Saeed Roshani2 Accepted: 29 October 2020 © Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract In this article, a miniaturized and harmonics suppressed Wilkinson power divider (WPD) is analytically designed. In the proposed divider composite transmission lines and resonator cells are utilized to eliminate unwanted harmonics and reduce circuit size. This structure has a 52% size reduction, compared to the typical WPD. According to the measured results, more than 22, 42, 45 and 40 dB suppression for 3rd, 4th, 5th and 6th harmonics are achieved. The presented WPD has lower than 0.15 dB insertion loss, more than 30 dB output ports isolation and more than 20 dB return losses in all ports at the operating frequency of 1.5 GHz is obtained. Keywords Composite transmission line · Harmonic suppressed · Insertion loss · Power divider · Resonator cell · Size reduction
1 Introduction Nowadays, microwave and radio-frequency devices are widely used in various applications [1–5]. The design of miniaturized devices is an important demand for modern wireless networks. Dividers are important components in the recent RF circuits and systems such as frequency multipliers, mixer and power amplifiers [6]. Recently, design a miniaturized power divider with harmonics rejections is an important challenge. So far, different methods are introduced, to reduce the circuit size of power dividers [7–10]. Using non-uniform transmission lines (TLs) instead of usual uniform TLs in [7], leads to decrease the overall size of the reported divider up to 52% compared to the conventional divider. In [8], coupled line sections are used to decrease the size of the power divider. Using microstrip EBG cell [9] and defected ground structure (DGS) [10], are also another methods to achieve size reduction, which are difficult to implement and not suitable methods to reduce the circuit size [11]. * Saeed Roshani [email protected] 1
Young Researchers and Elite Club, Kermanshah Branch, Islamic Azad University, Kermanshah, Iran
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Department of Electrical Engineering, Kermanshah Branch, Islamic Azad University, Kermanshah, Iran
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M. Heydari, S. Roshani
Compact resonators [12–16], low-pas filters [17–22] and band-pass filters [23–25] can be used in the dividers structure for size reduction and harmonics suppression purposes. Unfortunately, this method increases the insertion loss in the pass-band. Stub-loaded resonators in the reported structure in [26], resulted in 20 dB suppression for the 2nd and 3rd harmonics, besides size reduction. Using a coupling structure instead of the traditional quarter-wavelength lines in [27] resulted in a wide harmonics rejection band. In some recent works, artificial intelligence and neuro-based approaches are used to design optimum devices [28–30]. In this work, a miniaturized WPD with unwanted harmonics elimination is proposed. Composite transmission lines and r
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