Study on linearization of Ka-band wideband traveling-wave tube amplifer

f/GHz	S（3，1）/dB			S（4，1）/dB			S（1，1）/dB			S（2，1）/dB			S（3，4）/dB
f/GHz	two-branch bridge	three-branch bridge	four-branch bridge	two-branch bridge	three-branch bridge	four-branch bridge	two-branch bridge	three-branch bridge	four-branch bridge	two-branch bridge	three-branch bridge	four-branch bridge	two-branch bridge	three-branch bridge	four-branch bridge
26	−2.97	−3.63	−3.31	−3.51	−2.68	−3.02	−19.32	−33.79	−24.42	−16.17	−21.46	−18.88	−18.46	−32.36	−19.59
28	−2.42	−3.23	−3.18	−3.85	−2.99	−3.15	−48.48	−33.38	−28.18	−27.92	−26.41	−17.81	−44.82	−31.55	−24.14
30	−2.32	−3.03	−3.31	−4.17	−3.26	−3.07	−20.20	−21.40	−21.27	−22.19	−26.73	−18.47	−19.25	−21.00	−26.81

Table 2. [in Chinese]
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Table 2. [in Chinese]
IPBO/dB gain compression of TWTA/dB gain compression of linearized TWTA/dB
0 −5.81 −3.12
3 −3.31 −1.06
6 −1.77 −0.36
9 −0.92 −0.18
13 −0.34 −0.10
15 −0.19 −0.07

Table 3. [in Chinese]
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Table 3. [in Chinese]
IPBO/dB phase compression of TWTA/（°） phase compression of linearized TWTA/（°）
0 −33.31 −0.81
3 −23.88 ＋1.6
6 −14.77 ＋2.31
9 −8.39 ＋1.52
13 −3.5 ＋0.79
15 −2.03 ＋0.42

Table 4. [in Chinese]
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Table 4. [in Chinese]
IPBO/dB IMD3 of TWTA/dB IMD3 of linearized TWTA/dB
3 −10.75 −12.30
4 −11.74 −14.39
6 −13.94 −20.08
9 −17.97 −32.36
13 −24.11 −35.12

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Fei Han, Lei Xia, Baojian Li. Study on linearization of Ka-band wideband traveling-wave tube amplifer[J]. High Power Laser and Particle Beams, 2021, 33(4): 043003

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