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Transmission Lines
Published in Herbert J. Carlin, Pier Paolo Civalleri, Wideband Circuit Design, 2018
Herbert J. Carlin, Pier Paolo Civalleri
The Wilkinson power divider,5 with an equivalent circuit as shown in Fig. 7.2.2, is a relatively simple transmission line structure which functions as a three-port matched power splitter at a frequency where the electrical length of the UE is one-quarter wavelength. Demonstrate this result, and find the frequency response to illustrate the wideband properties of the device.
Compact microwave components based on artificial transmission lines with H-type defected ground structure
Published in Electromagnetics, 2021
Wen Huang, Xi Guo, Jia Li, Wei Ruan
The simulated and measured s-parameters of the proposed Wilkinson power divider are shown in Figure 12. According to the measurements, the central frequency is 0.94 GHz, while the simulated central frequency is 0.9 GHz. There is a frequency deviation of 0.04 GHz for the central frequency, which may be due to fabrication tolerances and measurement devices. Then, the fabricated Wilkinson power divider has a bandwidth of 29.8% from 0.75 GHz to 1.03 GHz with |S11| less than −15 dB. At 0.94 GHz, the return loss is 20.6 dB, and the insertion losses are 3.3 dB for the two output ports. Besides, the fabricated Wilkinson power divider has 20 dB suppression from 2.1 GHz to 7 GHz. As given in Figure 13, at 0.94 GHz the measured isolation is 24.3 dB, and the phase difference between outputs port is 1.2º. In Figure 14, compared with a conventional power divider operating at 0.9 GHz, the proposed power divider has a very good harmonic suppression in the stopband. Miniaturized size is achieved, while the bandwidth performance is similar to that of a conventional case.
An Enhanced Gain Dual-Polarized Dielectric Resonator Antenna Array with High Isolation for C-Band Applications
Published in IETE Journal of Research, 2018
Biswajit Dwivedy, Ayaskanta Panigrahi, Santanu Kumar Behera
To facilitate the feed network design, conventional single-sectioned Wilkinson power divider is chosen as it has a usable bandwidth of 1.44:1 for voltage standing wave ratio (VSWR) < 1.22, high isolation value, and ease of designing [23]. The basic Wilkinson power divider consists of an input line, two quarter wave lines, two output lines, and an isolation resistance. Here, two identical Wilkinson power dividers are used having an operational frequency of 6.5 GHz, where the input and output lines have impedance values of 50 Ω, quarter wave lines of 70.71 Ω, and isolation resistance of 100 Ω, as shown in Figure 9. One power divider is integrated to the upper part of the antenna array whereas the other is integrated to the lower side to excite two orthogonal modes. Additional matching stubs of lengths Lf2 and Lf3 are connected to the output arms of the Wilkinson power divider to achieve proper impedance matching between the feed and radiators. Detailed optimized dimensions of the feed network are presented in Table 2. Figure 10 focuses on the performance of the power divider where the transmission coefficient value is −3.25 dB and very good matching between the two transmission-coefficients are observed within the wideband. The feed network has slightly high insertion loss of 0.25 dB due to the lossy characteristic of FR-4 substrate but it may be tolerated for the sake of its low cost value and abundance availability in the market. The feed network has reflection coefficient value of −24 dB and isolation coefficient of −30 dB at the resonant frequency.
A dual-band Wilkinson power divider based on composite right/left-handed transmission lines with lattice networks
Published in Electromagnetics, 2020
Wen Huang, Ping Li, Wei Ruan, Xi Guo
Wilkinson power divider, which works as an indispensable power divider or combiner structure, plays a significant role in microwave wireless communication systems. The latest proposed researches about power dividers have mainly focused on developing the features such as wide bandwidth (Arand, Amrollahzadeh, and Kamalzadeh 2017), filtering (Lu et al. 2015), multi-way dividing (Song et al. 2017), harmonic suppression (Wu et al. 2016). Nowadays, with the rapid developments of RF/microwave circuits, there are increasing demands for devices capable of exhibiting their functionality in dual or multi-band simultaneously.