Design and Performance of Microstrip Diplexers: A Review

The radiofrequency microstrip diplexers are widely demanded nowadays by modern wireless communication systems. Hence, several types of previously reported microstrip diplexers are reviewed and investigated in this work. Microstrip diplexers are three ports devices used for separating desired signals and delivering them through two (or more) different channels. The diplexers are investigated in three categories of dual-channel bandpass-bandpass diplexers, multichannel diplexers, and lowpassbandpass diplexers. The investigated multi-channel diplexers include a number of four-channel, six-channel, and eight-channel diplexers. Due to the hard design process, the number of reported diplexers with more than four channels is limited. The layout structures and theory design methods of the previously reported diplexers are studied. Moreover, their size and performance are compared while some explanations about their advantages and disadvantages are presented. This comparison includes insertion loss, return loss, fractional bandwidths, isolation, selectivity, and gaps between channels

Microstrip Passive Components for Energy Harvesting and 5G Applications: A Comprehensive Review

This review paper provides a comprehensive overview of microstrip passive components for energy harvesting and 5G applications. The paper covers the structure, fabrication and performance of various microstrip passive components such as filters, couplers, diplexers and triplexers. The size and performance of several 5G and energy harvester microstrip passive devices are compared and discussed. The review highlights the importance of these components in enabling efficient energy harvesting and high-speed communication in 5G networks. Additionally, the paper discusses the latest advancements in microstrip technology and identifies key research challenges and future directions in this field. Overall, this review serves as a valuable resource for researchers and engineers working on microstrip passive components for energy harvesting and 5G applications

Design of Multiplexers for IoT-Based Applications Using Stub-Loaded Coupled-Line Resonators

This paper presents the design of microstrip-based multiplexers using stub-loaded coupled-line resonators. The proposed multiplexers consist of a diplexer and a triplexer, meticulously engineered to operate at specific frequency bands relevant to IoT systems: 2.55 GHz, 3.94 GHz, and 5.75 GHz. To enhance isolation and selectivity between the two passband regions, the diplexer incorporates five transmission poles (TPs) within its design. Similarly, the triplexer filter employs seven transmission poles to attain the desired performance across all three passbands. A comprehensive comparison was conducted against previously reported designs, considering crucial parameters such as size, insertion loss, return loss, and isolation between the two frequency bands. The fabrication of the diplexer and triplexer was carried out on a compact Rogers Duroid 5880 substrate. The experimental results demonstrate an exceptional performance, with the diplexer exhibiting a low insertion loss of 0.3 dB at 2.55 GHz and 0.4 dB at 3.94 GHz. The triplexer exhibits an insertion loss of 0.3 dB at 2.55 GHz, 0.37 dB at 3.94 GHz, and 0.2 dB at 5.75 GHz. The measured performance of the fabricated diplexer and triplexer aligns well with the simulated results, validating their effectiveness in meeting the desired specifications.publishedVersio

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A Design of Microstrip Diplexer based on Modified Stepped Impedance Resonators

This paper presents a design of modified stepped impedance resonator band-pass filter. Based on this new topology of band-pass filters, a microstrip diplexer has been achieved. The proposed circuit is designed to operate for the C-band applications at 4.5 GHz and 6.6 GHz. The microstrip diplexer is simulated using CST microwave studio software and Momentum integrated into ADS solver. The predicted electrical performances are demonstrated by the good agreement obtained between the two simulations results. The circuit presents good electrical performances with an insertion loss of 1 dB, a return loss better than 26 dB, and an isolation of 23 dB. This type of diplexers can be used in many telecommunications systems like Radar, Satellite communication, commercial and military applications

Tunable Microstrip Band-pass Filter based on Modified H-shaped Resonator

This paper is dedicated to study the tunability of the RF band-pass filters based on microstrip resonators. A compact band-pass filter based on Modified H-shaped resonator is designed and simulated using ADS solver. First, a qualitative study of the proposed resonator is introduced in order to detect the geometrical parameters that can affect the frequency response of the circuit. Then, two tunable capacitors are connected to the extremity of the band pass filter. Increasing the value of these capacitors puts the pass band at low frequencies. Besides, the capacitors have the ability to attenuate the spurious resonant frequencies and to enhance the selectivity of the filter. The design approach proposed in this paper shows that it is possible to control and to enhance the frequency response of microstrip band-pass filters based on tunable capacitors.

LISA: The Italian CRG beamline for x-ray Absorption Spectroscopy at ESRF

LISA is the acronym of Linea Italiana per la Spettroscopia di Assorbimento di raggi X (Italian beamline for X-ray Absorption Spectroscopy) and is the upgrade of the former GILDA beamline installed on the BM08 bending magnet port of European Synchrotron Radiation Facility (ESRF). Within this contribution a full description of the project is provided