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Broadband Tunable Phase Shifter and Attenuator Using Bandwidth Expansion Property of Dual-Microstrip Stubs-Loaded Slotline Structure
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DOI：10.1109/TCPMT.2025.3568811.png)
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Abstract
En 中文
This article proposes the design methods for a broadband 90 degrees phase shifter (PS) and a continuously tunable PS (CTPS) using the bandwidth expansion property of the dual-microstrip stubs-loaded slotline structure. First, the matching characteristics and phase shift characteristics of the dual- lambda /4 microstrip stubs-loaded lambda /4 slotline structure are theoretically analyzed, and the principle of expanding the bandwidth of the PS by introducing transmission poles and zero points of the phase shift slope is clarified. Second, a CTPS is designed based on a new mechanism of varactor-loaded slotline, which utilizes the bandwidth expansion characteristics of the dual- lambda /2 microstrip stubs-loaded two lambda /4 slotline structure and theoretically achieves a bandwidth of 42.6% and a low in-band phase error of +/- 2.9 degrees with more than the 90 degrees phase shift range (PSR). To verify the correctness and practicality of the theoretical analysis, the above PSs are employed as constituent units to design two applications: 1) A 360 degrees PS is implemented using the hybrid structure. 2) A variable attenuator (VA) is designed by a new method of vector-sum. Benefiting from the broadband and low-phase-error features of the CTPS, the proposed 360 degrees PS achieves a 10-dB return loss (RL) and +/- 5.4 degrees in-band phase error in a wide fractional bandwidth (FBW) of 40%, which is highly competitive compared to other works. The proposed VA can realize an attenuation range of 18 dB from 2 to 3 GHz, and it has the advantage of low insertion phase error.
Keywords:
Bandwidth
Slot lines
Microstrip
Broadband communication
Phase shifters
Attenuators
Mathematical models
Power transmission lines
Impedance
Transmission line matrix methods
Bandwidth expansion
continuous tunability
phase shifter (PS)
slotline
variable attenuator (VA)
Journal
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3
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198
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