
超宽带平坦负群时延电路设计
Design of Ultra-Wide Band Flat Negative Group Delay Circuit
本文提出了一种具有超宽带(Ultra-Wide Band,UWB)平坦负群时延响应的带通(BandPass,BP)负群时延(Negative Group Delay,NGD)电路设计.基于阶梯阻抗谐振(Stepped Impedance Resonator,SIR)结构设计了一种超宽带平坦负群时延无源电路.研究了电路的S参数模型和负群时延响应模型.电路结构紧凑,总尺寸为11 mm × 81 mm,电尺寸仅为0.13
A fundamental theory of novel ultra-wide band (UWB) bandpass (BP) negative group delay (NGD) topology is established in this paper. The microwave circuit under study consists of lossy transmission lines and stepped impedance resonators. The flat NGD topology is constructed using fully distributed elements. The ABCD- and S-parameter models are formulated to derive the NGD optimal values and bandwidth. In order to verify the theoretical feasibility, NGD prototypes are designed, fabricated, and measured. The flat BP-NGD microstrip circuit has a compact size of 11 mm × 81 mm (0.13 λg × 1.01 λg) with a NGD center frequency of fn =2.14 GHz. Excellent agreement has been observed between experimental and theoretical results, revealing Δf NGD=1.28 GHz (BWNGD=61%fn ) NGD bandwidth and tn =-0.52 ns NGD value. Furthermore, within the NGD frequency band, the flat BP-NGD prototype presents a good performance in terms of bandwidth about Δf NGD =1.01 GHz, BWflat-NGD =48%fn with tn ±0.05 ns group delay fluctuation. Compared with similar broadband flat NGD circuits, the flat NGD bandwidth of the SIR NGD circuit proposed in this article is increased by about 215%. The flat BP-NGD prototype return loss at the center frequency is better than 18.8 dB.
负群时延 / 平坦群时延 / 阶梯阻抗谐振 / S参数 / 设计公式 / 超宽带 {{custom_keyword}} /
negative group delay / group delay flatness / stepped impedance resonator / S parameter / design equations / ultra-wide band {{custom_keyword}} /
表1 宽带平坦NGD电路在中心频率2.14 GHz处的仿真与测试结果 |
频率 f 0 /GHz | 群时延 GD/ns | |S 11 | /dB | |S 21 | /dB | 带宽 /Hz | |
---|---|---|---|---|---|
| | - | -25.3 | -26.7 | 1.18 |
| | - | -25.5 | -26.7 | 1.15 |
| | - | -18.8 | -25.5 | 1.01 |
表2 SIR NGD电路与现有宽带NGD电路性能对比 |
现有论文 | 中心频率 f 0 /Hz | 群时延 GD/s | |S 11 |/dB | 电尺寸/ ( | 群时延 波动/% | 平坦NGD带宽 BW/MHz | 相对带宽/ (% @ f 0) | 品质因数 FOM1 /(×10-3) | 品质因数 FOM2/(×10-3) |
---|---|---|---|---|---|---|---|---|---|
| 1.962 | -6.0 | -32 | 0.64 × 0.60 | 16 | 60 | 3 | 4.1 | 10.7 |
| 2.14 | -0.49 | -35 | 0.73 × 1.01 | 10 | 320 | 14.7 | 10.7 | 14.5 |
| 1.00 | -2.02 | -11.3 | 0.18 × 0.25 | 8 | 100 | 10 | 9.6 | 213.3 |
| 2.14 | -1.21 | -20.9 | 0.64 × 0.92 | 29 | 40 | 2 | 1.1 | 1.72 |
| 1.00 | -1.50 | -30 | 0.80 × 0.09 | 13 | 120 | 12 | 3.6 | 50.0 |
| 2.00 | -3.10 | >-10 | 0.63 × 0.71 | 16 | 85 | 4.3 | 16.4 | 36.7 |
| 2.14 | -1.11 | -22.3 | 0.65 × 1.18 | 11.5 | 130 | 6.1 | 22.0 | 28.7 |
| 2.14 | -0.52 | -18.8 | 0.13 × 1.01 | 10 | 1 010 | 48 | 32.4 | 247.1 |
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