Reconfigurable Single-/Dual-Wideband Bandpass Filters Based on a Novel Topology
Abstract
:1. Introduction
2. Operation Principle and Design
2.1. Transmission Poles and Zeros
2.2. Reconfigurable Properties
3. Design Examples
- (1)
- On the basis of DWB BPF with the widest bandwidth, initially determine the design para-meters of the passive filtering structure, i.e., Z1, Z2, Z3, Z4, Zoo, Zoe, θ1, θ2, and θ3.
- (2)
- Based on the different locations of first and third passband edges, determine CF and CT.
- (3)
- Based on the various locations of second passband edge, determine CS and θ3.
- (4)
- After slightly optimizing, obtain the final parameters.
3.1. Three Independently Tunable Passband Edges
3.2. Independently Tunable Center Frequency of Lower Passband with Fixed Absolute Bandwidth
3.3. Independently Tunable Bandwidth of Lower Passband with Fixed Center Frequency
3.4. Independently Switchable Lower Passband
3.5. Independently Tunable First Passband Edge of SWB BPF
4. Conclusions
Author Contributions
Funding
Conflicts of Interest
References
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Lower Passband | Upper Passband | Lower Passband | Upper Passband | ||||||||
---|---|---|---|---|---|---|---|---|---|---|---|
First 1 | Second 2 | Third 3 | Fourth 4 | First 1 | Second 2 | Third 3 | Fourth 4 | ||||
Case A | Simulated | 2.48 GHz | 3.20 GHz | 3.74 GHz | 4.48 GHz | Case E | Simulated | 2.73 GHz | 2.96 GHz | 3.75 GHz | 4.48 GHz |
Measured | 2.44 GHz | 3.19 GHz | 3.73 GHz | 4.46 GHz | Measured | 2.70 GHz | 2.98 GHz | 3.74 GHz | 4.48 GHz | ||
Case B | Simulated | 2.75 GHz | 3.21 GHz | 3.74 GHz | 4.48 GHz | Case F | Simulated | N/A | N/A | 3.78 GHz | 4.49 GHz |
Measured | 2.73 GHz | 3.21 GHz | 3.75 GHz | 4.49 GHz | Measured | N/A | N/A | 3.76 GHz | 4.51 GHz | ||
Case C | Simulated | 2.48 GHz | 2.93 GHz | 3.75 GHz | 4.47 GHz | Case G | Simulated | N/A | N/A | 4.09 GHz | 4.49 GHz |
Measured | 2.47 GHz | 2.96 GHz | 3.72 GHz | 4.48 GHz | Measured | N/A | N/A | 4.07 GHz | 4.49 GHz | ||
Case D | Simulated | 2.48 GHz | 3.19 GHz | 3.92 GHz | 4.48 GHz | ||||||
Measured | 2.44 GHz | 3.17 GHz | 3.89 GHz | 4.47 GHz |
SWB BPFs | DWB BPFs | SWB BPFs | DWB BPFs | ||||||
---|---|---|---|---|---|---|---|---|---|
TBW 1 | TCF 2 | TBW 1 | SPB 3 | TBW 1 | TCF 2 | TBW 1 | SPB 3 | ||
[9] | No | Yes | No | No | Filter B in [17] | No | Yes | No | Yes |
[10] | No | Yes | No | No | Filter B in [20] | No | No | Yes | No |
[12] | Yes | No | No | No | Filter B in [22] | No | Yes | Yes | No |
[13] | Yes | No | No | No | This work | Yes | Yes | Yes | Yes |
[16] | No | No | No | Yes |
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Bi, X.; Guo, S.; Zhong, Z.; Hong, K.; He, W.; Yuan, T. Reconfigurable Single-/Dual-Wideband Bandpass Filters Based on a Novel Topology. Electronics 2020, 9, 2149. https://doi.org/10.3390/electronics9122149
Bi X, Guo S, Zhong Z, Hong K, He W, Yuan T. Reconfigurable Single-/Dual-Wideband Bandpass Filters Based on a Novel Topology. Electronics. 2020; 9(12):2149. https://doi.org/10.3390/electronics9122149
Chicago/Turabian StyleBi, Xiaokun, Shaohua Guo, Zengpei Zhong, Kaidong Hong, Wei He, and Tao Yuan. 2020. "Reconfigurable Single-/Dual-Wideband Bandpass Filters Based on a Novel Topology" Electronics 9, no. 12: 2149. https://doi.org/10.3390/electronics9122149