Microstrip Diplexer Using Stepped Impedance Resonators

Abstract

International audienceIn this paper, a compact diplexer based on coupled stepped impedance resonators (SIRs) is designed for Digital Communication System and the industrial, scientific and medical applications. The diplexer is composed from two band-pass filters operated at 1.8 and 2.45 GHz respectively. The size and the position of the SIR and the feed lines are determined through the theoretical design and the simulation. The diplexer has less than 2.2 dB insertion loss and more than 21 dB of isolation. The diplexer performances are investigated numerically by using Momentum ADS Agilent and CST microwave software.The electromagnetic simulated results of the proposed diplexer show a good agreement with the measured results

Design and Fabrication of a Novel Compact Low-loss Microstrip Diplexer for WCDMA and WiMAX Applications

“…However, it has large insertion loss and small return loss at both channels. Large common port return losses and large implementation areas are achieved in [7], [9] and [14]- [17]. The proposed diplexers in [9] and [14]- [17] have large insertion losses higher than 1.5 dB.…”

“…resonators [9], triangular resonators [10], complex meandrous loops [11], and spiral based resonators [12] have been utilized for designing microstrip diplexers. They have some problems such as high loss or large implementation area.…”

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

“…In [7], a microstrip diplexer has been achieved using three simple U‐shape resonators integrated by coupled lines. Coupled step impedance cells [8], meandrous closed loops connected to interdigital structures [9], coupled spiral cells [10], meandrous line and patch cells [11] and engraved semi‐patch cells [12] have been utilised to design the two‐channel microstrip diplexers. The microstrip diplexer in [13] has been designed based on the slot line‐loaded microstrip ring resonator.…”

System modelling and synthesis of stepped impedance resonators and filters

“…The SIR can provide dual-band operation by adjusting the location of the second resonance utilising the stepped impedance ratio. The SIRs can be used in several practical applications, like antennas [4], filters [5,6], duplexer [7] and mixers [8].…”