A Compact Rat-Race Coupler With Widely Tunable Frequency- and Power-Dividing Ratio

Tan, Xiangguan; Zhang, Yuxia

doi:10.1109/lmwt.2023.3330491

IEEE Microw. Wireless Tech. Lett.

2024

DOI: 10.1109/lmwt.2023.3330491

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A Compact Rat-Race Coupler With Widely Tunable Frequency- and Power-Dividing Ratio

Xiangguan Tan,

Yuxia Zhang

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2024

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A Compact Bandpass Filter with Widely Tunable Frequency and Simple Bias Control

Xiang,

Tan,

Ding

et al. 2024

Electronics

Self Cite

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This research paper introduces an innovative design for a compact bandpass filter, notable for achieving a substantial tuning range of operational frequencies using just a single bias voltage. The design is based on a planar microstrip approach, distinguished by its straightforward and efficient structure. Additionally, this filter is characterized by its excellent performance in suppressing out-of-band frequencies. To validate the practicality and effectiveness of this novel design, a compact filter was designed, manufactured, and measured. The testing results were impressive, showing that the filter’s measured center frequency could be tuned across a wide spectrum, from 1.1 to 3.1 GHz, achieving a relative bandwidth of up to 95%. Herein, the relative bandwidth is derived from the calculation of 2(fhigh − flow)/(fhigh + flow). Remarkably, the filter consistently maintains a return loss exceeding 19 dB throughout its tuning range. Additionally, it sustains a 15 dB return loss bandwidth greater than 90 MHz, with the insertion loss varying between a minimum of 0.9 dB and a maximum of 2.1 dB. The compactness of the filter is one of its standout features, with circuit dimensions measuring a mere 0.06λg × 0.09λg (physical dimensions is 13.8 mm × 21.3 mm), where λg represents the wavelength at the filter’s lowest center frequency.

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A Compact Bandpass Filter with Widely Tunable Frequency and Simple Bias Control

Xiang,

Tan,

Ding

et al. 2024

Electronics

Self Cite

View full text Add to dashboard Cite

show abstract

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A Compact Rat-Race Coupler With Widely Tunable Frequency- and Power-Dividing Ratio

Cited by 1 publication

References 14 publications

A Compact Bandpass Filter with Widely Tunable Frequency and Simple Bias Control

A Compact Bandpass Filter with Widely Tunable Frequency and Simple Bias Control

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