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TechnicalFeature 技术特写

参考文献
表3 L-C模型取值 1. D. M. Pozar, Microwave Engineering, Third Edition, Wiley,
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参数 L 4 L 5 C 4 C 5 L 3 2. J. S. Hong and M. J. Lancaster, Microstrip Filters for RF/
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取值 0.470 3.000 2.325 0.150 4.193 3. P. M. Raphika, P. Abdulla and P. M. Jasmine, “Planar
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表4 LPF性能比较
4. Gh. Karimi, A. Lalbakhsh, Kh. Dehghani and H. Siahkamari,
文献 ξ RSB SF NCS AF 谐波抑制 FOM “Analysis of Novel Approach to Design of Ultra-Wide
Stopband Microstrip Lowpass Filter Using Modified
3 94 1.261 2 0.243 × 0.169 1 4 5.772 U-Shaped Resonator,” ETRI Journal, Vol. 37, No. 5,
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4 135 1.64 2.2 0.160 × 0.200 1 11 15.221 5. P. Zhang and M. Li, “A Novel Sharp Roll-Off Microstrip
5 159 1.146 2 - 2 3 - Lowpass Filter with Improved Stopband and Compact Size
Using Dual-Plane Structure,” Microwave and Optical
6 48.57 1.5 2 0.160 × 0.080 2 9 11.383 Technology Letters, Vol. 58, No. 5, May 2016, pp. 1085–
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13 95.5 1.359 2 0.540 × 0.480 2 5 500.5 6. A. K. Verma, N. Chaudhari and A. Kumar, “Improved
14 78 1.6 2 0.160 × 0.100 2 15 7.800 Performance Step Impedance Lowpass Filter,” International
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15 - 1.125 2 0.450 × 0.350 2 5 - March 2013, pp. 761–770.
7. M. Kufa and Z. Raida, “Lowpass Filter with Reduced
16 29.3 1.53 2.4 0.0075 2 10 7.172 Fractal Defected Ground Structure,” IET Electronics
17 84.69 1.51 2 0.143 × 0.156 1 7 11.625 Letters, Vol. 49, No. 3, January 2013, pp. 199–201.
8. H. R. Khakzad, S. H. Sedighy and M. K. Amirhosseini,
18 58.6 1.43 2.5 0.220 × 0.110 1 7 8.657 “Design of Compact SITLs Low Pass Filter by Using
Invasive Weed Optimization (IWO) Technique,” Applied
19 52.8 1.529 2 0.081 × 0.113 1 10 17.640 Computational Electromagnetics Society Journal, Vol. 28,
20 97.4 1.87 2 0.100 × 0.190 1 29 19.172 No. 3, March 2013, pp. 228–233.
9. K. Li, M. Zhao, Y. Fan, Z. Zhu and W. Cui, “Compact
本文 72 1.86 2.4 0.153 × 0.065 1 34 32.465 Lowpass Filter with Wide Stopband Using Novel Double-
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其中α min 和α max 分别为-3dB和-40dB 结论 Progress In Electromagnetics Research Letters, Vol. 36,
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处的抑制点。f s 是对应于α max 的频率， 本文加工和测试了一款超宽抑制带 10. S. S. Karthikeyan and R. S. Kshetrimayum, “Compact and
Wide Stopband Lowpass Filter Using Open Complementary
f c 是对应于αmin的频率。相对阻带带宽 LPF，它采用对称的改进T形和旗形谐振 Split Ring Resonator and Defected Ground Structure,”
（RSB）为 器。阻带宽度为62.62 GHz（从2.38到65 Radioengineering, Vol. 24, No. 3, September 2015, pp.
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GHz），具有超过24dB的抑制。相比近期 11. A. Boutejdar, A. Omar and E. Burte, “High-Performance
（16）
其他报道，这种配置具有最好的谐波抑制 Wide Stop Band Lowpass Filter Using a Vertically Coupled
抑制因子（SF）为 性能（从2到34次）和最小的尺寸。■ DGS-DMS-Resonators and Interdigital Capacitor,”
Microwave and Optical Technology Letters, Vol. 56, No. 1,
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（17） 12. M. Xiao, G. Sun and X. Li, “A Lowpass Filter with
W 19 Compact Size and Sharp Roll-Off,” IEEE Microwave and
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W m H m
（18） 13. Y. Zhang, L. Jin and L. Li, “Design of LPF Using Hi-Lo
Interdigital DGS Slot,” Institute of Electronics, Information
对于 2D 和 3D 电路，架构因子 (a) and Communication Engineers Electronics Express, Vol. 13,
No. 9, March 2016, pp. 1–6.
（AF）分别定义为1和2，FOM为 14. F. C. Chen, H. T. Hu, J. M. Qiu and Q. X. Chu, “High-
Selectivity Lowpass Filters with Ultrawide Stopband Based
（19） on Defected Ground Structures,” IEEE Transactions on
Components, Packaging and Manufacturing Technology,
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15. A. Boutejdar, “Design of Broad-Stop Band Low Pass Filter
Using a Novel QUASI-YAGI-DGS-Resonators and Metal
H 11
Box-Technique,” Microwave and Optical Technology
W 18
W 19 Letters, Vol. 56, No. 3, March 2014, pp. 523–528.
H 12
16. S. Majidifar, “Design of High Performance Miniaturized
W 17
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(a) Vol. 31, No. 1, January 2016, pp. 52–57.
(b) 17. M. Hayati, M. Gholami, H. S. Vaziri and T. Zaree, “Design
of Microstrip Lowpass Filter with Wide Stopband and
0 0 Sharp Roll-Off Using Hexangular Shaped Resonator,” IET
–10 |S 11 | Electronics Letters, Vol. 51, No. 1, January 2015, pp. 69–71.
–20 –20 18. M. Mirzaee and B. S. Virdee, “Realisation of Highly
Compact Planar Lowpass Filter for UWB RFID
Magnitude (dB) –40 Magnitude (dB) –40 |S 21 | Applications,” IET Electronics Letters, Vol. 49, No. 22,
–30
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–50
Wide Stopband Using Stepped Impedance Hairpin Units,”
–60 |S 11 | 19. S. Liu, J. Xu and Z. Xu, “Compact Lowpass Filter with
|S 21 | –60
–70 Measurement IET Electronics Letters, Vol. 51, No. 1, January 2015, pp.
Simulation 67–69.
–80 –80 20. S. Roshani, “A Compact Microstrip Low-Pass Filter with
0 5 10 15 20 25 30 35 0 10 20 30 40 50 60 70
Frequency (GHz) Frequency (GHz) Ultra Wide Stopband Using Compact Microstrip Resonant
(b) (c) Cells,” International Journal of Microwave and Wireless
图10：改进后的LPF：(A)布局；(B)EM 图11：完整的低通滤波器：(a)布局，(b) Technologies, September 2016, pp. 1–5.
仿真。 滤波器，(c)性能的仿真-实测对照。
36 www.mwjournalchina.com Microwave Journal China 微波杂志 Nov/Dec 2018