New Miniature Narrow Band Microstrip Diplexer for Recent Wireless Communications

Abstract

Using Kappa substrate material, a compact microstrip diplexer is developed in this research with two separate channels based on the coupled junction and two bandpass filters functioning in independent frequency bands. Each filter comprises an input/output feed line and a number of resonators with different impedances. The diplexer’s frequency response was modeled and optimized using the Sonnet EM solver. At 2.84 and 4.08 GHz for TX/RX channels, the insertion loss is better than 1 dB for both channels, while the return loss values are 21.2 and 17 dB for transmit and receive filters, respectively. The microstrip diplexer has miniature dimensions of 24 mm × 18 mm with highly narrow bands and band isolation of more than 35 dB. The simulated scattering parameters are in agreement with the measured ones.

Microstrip Passive Components for Energy Harvesting and 5G Applications

“…7d). As shown, this diplexer can select the desired frequencies better than the proposed design in (Majdi and Mezaal, 2023).…”

“…Compact Size: Microstrip passive components are inherently compact and can be integrated into small form factors, making them ideal for energy harvesting systems and miniaturized 5G devices where space is limited. (Majdi and Mezaal, 2023), (b) lowpass filter in (Majidifar, 2016), (c) lowpass filter in (Fadaee, et al, 2023), (d) BP-BP diplexer in (Rezaei and Nouri, 2020). BP-BP: Band-pass-band-pass.…”

Novel Ultra-Compact Wide Stopband Microstrip Lowpass-Bandpass Triplexer for 5G Multi-Service Wireless Networks

“…In the modern multi-channel communication systems, for mixing or dividing signals we need to handle lowpass and bandpass signals. Hence, various types of microstrip filtering devices have been designed in recent years [1][2][3][4][5][6]. Meanwhile, the design of multiplexers [7,8] and triplexers [9] is more important.…”

A Compact Negative Group Delay Microstrip Diplexer with Low Losses for 5G Applications

“…The main application of a diplexer is in wireless communication systems, such as cellular networks and satellite communication. It enables the sharing of a single antenna for multiple frequency bands, reducing the number of antennas needed, and hence the cost and complexity of the system (Al-Majdi and Mezaal, 2023;Deng, Xu and Zheng, 2023;Chaudhary, Roshani and Shabani, 2023). Several different microstrip configurations are presented to create diplexers for wireless RF applications.…”

“…The dual-mode squared shape BPFs are used to obtain a microstrip diplexer in (Alnagar, et al, 2022). The common problems of the proposed diplexers in (Al-Majdi and Mezaal, 2023;Deng, Xu and Zheng, 2023;Chaudhary, Roshani and Shabani, 2023;Duan, et al, 2023;Alnagar, et al, 2022) are their high insertion losses and large dimensions. Based on a new resonator, a compact diplexer is proposed in (Yahya, Rezaei and Nouri, 2021) which works at 3 GHz and 1.4 GHz for S-band and L-band wireless applications.…”