Compact low‐loss microstrip diplexer for RF energy harvesting

Abstract

A compact low-loss microstrip diplexer that forms by two band-stop filters using interdigital capacitor and a stepped-impedance resonator structure when joined by a miniature T-junction is introduced. The diplexer operates at global system for mobile communication frequency 1800 MHz and 2.45 GHz WLAN frequency which are the most available frequency bands for RF energy harvesting applications. Simulated and measured results are in very good agreement with low insertion loss of 0.4 dB and high selectivity characteristics.

Compact wide stopband microstrip diplexer with flat channels for WiMAX and wireless applications

“…On the other hand, using a new resonator in the diplexer design is a significant advantage. Coupled open loops in [1], stub‐loaded coupled open loops in [2], interdigital cells in [3], and stub‐loaded U‐shaped cells in [4, 5] have been used. The proposed diplexer in [6] has a novel structure consisting of step impedance cells, loops, coupled lines and low impedance sections.…”

An Area-efficient Microstrip Diplexer with a Novel Structure and Low Group Delay for Microwave Wireless Applications

“…Microstrip diplexers are attractive devices for the frequency domain multiplexing in modern communication systems (Yahya, Rezaei and Nouri, 2020a). Several types of microstrip structures have been used to design diplexers for wireless applications Rezaei, Nouri and Mohammadi, 2019;Huang, et al, 2016;Rezaei, et al, 2019a;Jun-Mei, Zhou and Cao, 2016;Peng and Chiang, 2015;Rezaei, et al, 2019b;Salehi, et al, 2016;Rezaei and Noori, 2018;Chen, 2015;Xiao, 2015;Noori and Rezaei, 2017a;Mohamadi, 2017, Noori andRezaei, 2017b;Bui, et al, 2017;Guan, et al, 2014;Bukuru, Song and Xue, 2015;Yahya, Rezaei and Nouri, 2020b;. However, all of these diplexers occupy a large implementation area.…”

“…The above-mentioned diplexers could not attenuate the 4 th harmonics except the introduced diplexer in (Salehi, et al, 2016), which could suppress the harmonics from 1 st up to 4 th harmonics. Similarly, the other designed diplexers (Rezaei and Noori, 2018;Chen, 2015;Xiao, 2015;Noori and Rezaei, 2017a;Mohamadi, 2017, Noori andRezaei, 2017b;Bui, et al, 2017;Guan, et al, 2014;Bukuru, Song and Xue, 2015; have the problem of unsuppressed harmonics. The proposed diplexer in Rezaei and Noori, 2018, which has been proposed based on novel microstrip engraved patch cells, has low insertion losses at both channels and several TZs at its stopband.…”

“…Nevertheless, the isolation between channels of this diplexer is low. Interdigital cells in (Bui, et al, 2017), two coupled E-shape structures in (Guan, et al, 2014), and coupled spiral resonators in (Bukuru, Song and Xue, 2015), have been used to design microstrip diplexers. In (Yahya, Rezaei and Nouri, 2020b), a high-performance microstrip multiplexer has been designed using computational intelligence for multi-band RF wireless communications systems.…”

Design of a high–performance lowpass–bandpass diplexer using a novel microstrip structure for GSM and WiMAX applications

“…A matching circuit consisting of two coupled transmission lines with different widths are utilised to integrate the resonators. Several types of bandpass-bandpass diplexers are reported in [13][14][15][16]. Due to the decrease in insertion losses at both channels, the proposed diplexer in [13] is a suitable structure for RF energy harvesting.…”