Highly Reconfigurable Patch Coupler With Frequency and Power-Dividing Ratio Control for Millimeter-Wave Applications

Khanjar, Karrar Al; Djerafi, Tarek

doi:10.1109/tmtt.2023.3234628

Cited by 5 publications

(1 citation statement)

References 27 publications

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“…To mitigate this challenge, the industry has introduced the concept of tunable systems, which feature adjustable hardware parameters. Tunable designs, such as filters [5][6][7][8][9][10][11][12][13][14][15][16][17][18], couplers [19][20][21], and antennas [22], represent a significant advancement in this field. By incorporating tunability into these components, there is a substantial reduction in the number of passive elements required.…”

Section: Introductionmentioning

confidence: 99%

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

Xiang,

Tan,

Ding

et al. 2024

Electronics

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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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