A dual‐mode tunable bandpass filter for GSM, UMTS, WiFi, and WiMAX standards applications. (7th February 2019)

• Record Type: Journal Article
• Authors: Sedighi Maragheh, Samaneh; Dousti, Massoud; Dolatshahi, Mehdi; Ghalamkari, Behbod
• Is Part Of: International journal of circuit theory and applications. Volume 47:Number 4(2019)
• Page Start: 561
• Page End: 571
• Publication Date: 2019-02-07
• Subjects: LC model -- microstrip -- PIN diode -- tunable bandpass filter -- varactor; Electric circuit analysis -- Periodicals; 621.319205
• DOI: 10.1002/cta.2607
• Languages: English
• ISSNs: 0098-9886

Abstract

Summary: This paper presents a dual‐mode tunable bandpass filter (BPF) for global system for mobile communication, universal mobile telecommunications system, wireless fidelity, and worldwide interoperability for microwave access standard applications. The proposed filter consists of a stepped‐impedance resonator, single resonator, and coupled line, which are loaded with varactors. The center frequency and bandwidth of the proposed filter can be tuned with tuning varactors. Furthermore, the measurement results show that the BPF can be tuned over the frequency range of 1.8 to 2.5 GHz. Moreover, the bandwidth can be changed at each certain frequency. Furthermore, using PIN diodes, a bandstop filter is added to the tunable BPF to reduce the out‐of‐band frequencies around the desired frequencies. The values of LC equivalent circuits are calculated, and the results are compared with those obtained from the layout of the proposed structure. Finally, the measurement results justify the simulation results. Abstract : This paper presents a dual‐mode tunable bandpass filter for global system for mobile communication, universal mobile telecommunications system, wireless fidelity, and worldwide interoperability for microwave access standard applications. The proposed filter consists of a stepped‐impedance resonator, single resonator, and coupled line, which are loaded with varactors. The center frequency and bandwidth of the proposed filter can be tuned with tuning varactors.