374~747 MHz数字可调谐微带滤波器

doi:10.11959/j.issn.1000-436x.2016163

Abstract

Abstract:

A novel digital microstrip tunable bandpass filter based on digitally tunable capacitor loading microstrip open ring resonators was proposed.The novel non-uniform open ring resonances with mixed coupling structure was used to make the coupling coefficient of the resonators increases with the decreasing of resonance frequency and achieve a con-stant absolute bandwidth tunable filter.Then the proposed digital tunable microstrip filters based on 5 bit digitally tunable capacitance was simulated and manufactured.The measurement shows that the ?3 dB absolute bandwidth varies from 44~67 MHz while the central frequency of the passband varying from 374~747 MHz,the OIP3 is greater than 50 dBm.

Key words: constant absolute bandwidth, digitally tunable capacitor, bandpass filter, microstrip open ring resonators

Deng-yao TIAN,Quan-yuan FENG,Qian-yin XIANG. 374~747 MHz digital tunable microstrip filter[J]. Journal on Communications, 2016, 37(8): 129-135.

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References 18

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参数	典型值
Y₁/φ₁/Y₂/φ₂	0.016/4.16×10^?11ω/0.013/1.56×10^?10ω
Y₃/φ₃/φ₆	0.012/7.14×10^?11ω/2.15×10^?11ω
Y_4e/φ_4e/Y_4o/φ_4o	0.010/1.89×10^?11ω/0.015/1.74×10^?11ω
Y_5e/φ_5e/Y_5o/φ_5o	0.011/1.50×10^?10ω/0.027/1.32×10^?10ω

方法	f₀/GHz	带宽范围	插入损耗/dB	OIP3/dBm	调节技术	中心频率调节比	控制电压/V
文献[ 14 ]方法	0.45~0.94	N/A	7.9 ± 0.15	N/A	LC+DTC (0.6~4.6 pF,5 bit)	2.09	5
文献[ 8 ]方法	2.415~2.732	?3 dB:200.6~219.1 MHz	1.7~2.7	13.3~33.4	微带线+变容二极管(0.63~2.67 pF)	1.13	0~30
文献[ 12 ]方法	1.52~1.95	?1 dB:4.4%~5.4%	1.25~2.9	N/A	微带线+变容二极管(0.9~3.4 pF)	1.28	2.4~22
文献[ 16 ]方法	0.803~1.335	?1 dB:5.1%~5.7%	1.04~2.88	10.1~17.5	微带线+变容二极管(0.49~3.97 pF)	1.66	1~20
本文方法	0.374~0.747	?3 dB:44~67 MHz	3~3.6	50.9~51.9	微带线+DTC (0.6~4.6 pF,5 bit)	2.00	5

374~747 MHz digital tunable microstrip filter

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References 18

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