Input-Reflectionless 2.4-3.8 GHz Balun With Low Phase/Amplitude Imbalance Using Stacked-Coupled Microstrip Line

In this paper, a compact input-reflectionless balun with low phase/amplitude imbalance based on stacked-coupled microstrip line is proposed, which consists of reflectionless- and balun-sections. The reflectionless-section is a particular two-stage coupled transformation structure. The absorbing resi...

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Bibliographic Details
Main Authors: Zhang, Siyi, Rao, Yunbo, Dong, Yuandan, Luo, Xun
Format: Conference Proceeding
Language:English
Subjects:
balun
Baluns
input-reflectionless
Insertion loss
low phase/amplitude imbalance
Microwave measurement
Phase measurement
Prototypes
Resistors
stacked-coupled microstrip line
Wireless communication
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Summary:In this paper, a compact input-reflectionless balun with low phase/amplitude imbalance based on stacked-coupled microstrip line is proposed, which consists of reflectionless- and balun-sections. The reflectionless-section is a particular two-stage coupled transformation structure. The absorbing resistor is located at the end of 90 ° stacked-coupled microstrip line, which can introduce theoretically ideal all-band reflectionless characteristics. Meanwhile, the balun is composed of two symmetrical couplers, where two output ports have 180 ° phase difference with equal power division. By cascading these two sections, a prototype of input-reflectionless balun is achieved. To verify the operation mentioned above, a compact balun operated at 2.4-3.8 GHz with 3-dB factional bandwidth (FBW) of 45% is proposed and fabricated. The minimum in-band insertion loss is 1.1 dB with reflectionless level of −10 dB from DC to 8.2 GHz.
ISSN:2576-7216
DOI:10.1109/IMS37964.2023.10187931