Unbalanced Two-Way Filtering Power Splitter for Wireless Communication Systems

Nwajana, Augustine O.; Ijemaru, Gerald K.; Ang, Kenneth Li-Minn; Seng, Kah Phooi; Yeo, Kenneth Siok Kiam

doi:10.3390/electronics10050617

Cited by 6 publications

(3 citation statements)

References 24 publications

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“…The lumped elements circuit model of Fig. 2 was simulated on the commercially available Keysight electromagnetic (EM) circuit simulator, Advanced Design System (ADS), with the J-inverters modelled as capacitors-only networks as reported in [15], [16] and shown Fig. 3.…”

Section: Circuit Modelmentioning

confidence: 99%

Formulation for Energy Distribution in T-Junctions for Diplexer Design

Nwajana

Ogbodo

Imasuen

2021

2021 International Conference on Electrical, Communication, and Computer Engineering (ICECCE)

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A new formulation for implementing T-junction matching networks used in diplexer design is proposed in this paper. The investigation exploits the electrical length of quarter-wavelength microstrip transmission lines, and the guided-wavelength of the lines at one giga-Hertz frequency, in achieving the T-junction design formulation. This novel design would eradicate the uncertainties associated with frequent tuning and optimisation of T-junctions to achieve the desired energy distribution in diplexer designs. A prototype diplexer for separating the transmit from the receive frequencies within the front end of a wireless cellular base station is investigated and used to demonstrate the new design method. The prototype microwave diplexer with Tx and Rx centre frequencies of 2680 MHz and 3000 MHz, respectively, have been designed, implemented using microstrip, simulated, and presented. The simulation results of the circuit model and that of the microstrip layout prototype diplexer, demonstrate decent agreement with a high isolation of better than 50 dB between the transmit (Tx) and the receive (Rx) channels. The in-band lowest insertion loss is located at 1.1 dB, with a better than 20 dB in-band return loss across both the Tx and Rx bands.

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Section: Circuit Modelmentioning

confidence: 99%

Formulation for Energy Distribution in T-Junctions for Diplexer Design

Nwajana

Ogbodo

Imasuen

2021

2021 International Conference on Electrical, Communication, and Computer Engineering (ICECCE)

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“…Power-dividing technologies have drawn enormous attention in the research community for the last decades due to their extensive applications in microwave electronic devices, network power amplifiers, radio frequency (RF) circuits, feedback network and beam-forming antenna arrays, and electronic measurement systems, etc [1][2][3][4][5]. From a historical account, in 1960 Ernest J Wilkinson conjectured a powersplitting device prototype that divides a source signal into n paths with equiphase equiamplitude to realize efficient power combination/division while it maintains high isolation [6].…”

Section: Introductionmentioning

confidence: 99%

Arbitrary low-frequency power-splitting strategy in ferrite/piezoelectric magnetoelectric heterostructures: theory and experimental validation

Zhang,

Gao,

Filippov

et al. 2024

Smart Mater. Struct.

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Exploring low-frequency (LF) arbitrary power-splitting technologies to address the independent excitation issues of LF/VLF mechanical antennas (MA) with random distributions is challenging due to unidentified device construction and operation mechanism. In light of this, a device construction strategy for three-port magnetoelectric (ME) arbitrary power splitter in composite of ferrite/piezoelectric heterostructure, as well as theoretical model was developed. To validate the feasibility and effectiveness of the strategy, three size-tailored ME samples with length ratio of split PZT segments in 1:1, 2:1, and 3:2 were modeled, fabricated and comparatively characterized. Experimental results show that the achievable maximum power conversion efficiencies (PE) reach 52%, 71%, and 59% for three tailored ME samples, respectively, and as expected the power-splitting ratios are directly proportional to the square ratio of ME voltage coefficient (MEVC) from each port of the tailored ME samples, which are in coincidence with theory under desired operation stability and favorable experiment repeatability evaluated by uncertainties of 0.25854 V/cm Oe and 0.32979 V/cm Oe for each port. Therefore, a prediction of evolutionary tendency for arbitrary power splitter realization was expanded in view of our experimental observations, and a great flexibility for device future design and further optimization was also provided. Therefore, the presented LF power-splitting strategy paves the ways for arbitrary power splitter realization and enriches the multi-functional ME power electronics families, as well as enables potential applications for efficient excitations of MAs in high-permeable military underwater and civilian emergency rescue distribution long-wave communication system for practical scenarios of submarine, underground railways, tunnels and collapsed residential buildings.

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“…This technique of using a transmission line to externally link the WPD with a filter will not only increase the physical size but will also lead to higher loss coefficient in the system [3]. In contrast to the traditional approach involving a bandpass filter, a matching transmission line, and a Wilkinson power divider as separate components, the proposed integrated filtering power divider (FPD) consolidates all three components into a single device [4]- [6] as shown in Fig. 1(b).…”

Section: Introductionmentioning

confidence: 99%

Application of Compact Folded-Arms Square Open-Loop Resonator to Bandpass Filter Design

Nwajana

Raymond²

2023

Micromachines

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Folded-arms square open-loop resonator (FASOLR) is a variant of the conventional microstrip square open-loop resonator (SOLR) that facilitates further device size miniaturization by having the two arms of the conventional SOLR folded inwards. This paper highlights the benefits of this brand of compact SOLR by implementing a five-pole Chebyshev bandpass filter (BPF) using compact FASOLR. The test BPF is presented, with centre frequency of 2.2 GHz, fractional bandwidth of 10%, passband ripple of 0.04321 dB, and return loss of 20 dB. The design is implemented on a Rogers RT/Duroid 6010LM substrate with a dielectric constant of 10.7 and thickness of 1.27 mm. The filter device is manufactured and characterised, with the experimentation results being used to justify the simulation results. The presented measurement and electromagnetic (EM) simulation results demonstrate a good match. The EM simulation responses achieve a minimum insertion loss of 0.8 dB and a very good channel return loss of 22.6 dB. The measurement results, on the other hand, show a minimum insertion loss of 0.9 dB and a return loss of better than 19.2 dB. The filter component has a footprint of 36.08 mm by 6.74 mm (that is, 0.26 λg x 0.05 λg), with λg indicating the guided wavelength for the 50 Ohm microstrip line impedance at the centre frequency of the proposed fifth-order bandpass filter.

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Unbalanced Two-Way Filtering Power Splitter for Wireless Communication Systems

Cited by 6 publications

References 24 publications

Formulation for Energy Distribution in T-Junctions for Diplexer Design

Formulation for Energy Distribution in T-Junctions for Diplexer Design

Arbitrary low-frequency power-splitting strategy in ferrite/piezoelectric magnetoelectric heterostructures: theory and experimental validation

Application of Compact Folded-Arms Square Open-Loop Resonator to Bandpass Filter Design

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