Tunable Balanced Bandpass Filter With Wide Tuning Range of Center Frequency and Bandwidth Using Compact Coupled-Line Resonator
- Publisher:
- IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
- Publication Type:
- Journal Article
- Citation:
- IEEE Microwave and Wireless Components Letters, 2016, 26, (1), pp. 7-9
- Issue Date:
- 2016-01-01
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Filename | Description | Size | |||
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Tunable_Balanced_Bandpass_Filter_With_Wide_Tuning_Range_of_Center_Frequency_and_Bandwidth_Using_Compact_Coupled-Line_Resonator.pdf | Published version | 1.25 MB |
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A tunable balanced bandpass filter using a short coupled-line resonator is proposed. The design aims at achieving a wide tuning range in the differential-mode for both of the center frequency and bandwidth with high common-mode suppression. The proposed filter uses a short section (about one-eighth of one wavelength) of parallel-coupled lines connecting the differential ports of the device and five pairs of varactors. A theoretical analysis using the even-odd mode theory is presented to verify the tunability of the design and calculate the initial values of its design parameters. For validation, a prototype is designed, fabricated and tested. The measured results indicate that the differential-mode tuning range for the center frequency and 3 dB- bandwidth extend from 0.58 to 1.22 GHz, and from 65 to 180 MHz, respectively, with more than 30 dB of common-mode suppression in the operating differential-mode passband. Moreover, the proposed device has a compact size (with respect to the guided wavelength) of only 0.12λGx0.08λG.
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