C-Band High Harmonics Suppression GaN Power Amplifier MMIC for Multiradar Network Application

An improved harmonics suppression power amplifier circuit using integrated self‐resonant capacitor for radar application

“…S 21 transmission characteristics simulation of the OMN. (A) Bump phenomenon at f S1 in Yang et al 6 (B) This work.…”

“…According to LC resonance theory, the value of capacitance of C 1 can be determined when the parasitic inductance is known. 13,14 The LC resonance is used at the power synthesis end to generate another zero point f z1 at 2f L , which has the advantage of further improving the SHS and avoiding the À20-dB bump phenomenon at f S1 in Yang et al 6 as shown in Figure 6. The bump phenomenon at f S1 is sensitive due to the influence of process parameters.…”

“…Figure 1 shows half of the circuit schematic diagram of the proposed HPA MMIC's OMN, and the other half is completely symmetrical. The primary and drive stages are the same with Yang et al 6 All the transistors adopt a source independent via structure (ISV) with smaller parasitic inductance to achieve higher PAE and output power characteristics. For the sake of attaining a power gain of more than 20 dB, a two‐stage amplifier circuit structure is adopted.…”

“…To date, some high-level C-band GaN HPA MMIC research have been reported, [1][2][3][4][5][6][7] most are trying to achieve high output power and PAE of the HPA, but pay little attention to the harm caused by the harmonics generated of the HPA. In, [8][9][10] the HSs method did not show good wideband performance (less than 400 MHz) with band-pass filter, and the HPA had been realized based on hybrid microstrip filter, therefore, the size are more than 2000 mm 2 and the power gain are less than 15 dB, which is not conducive to miniaturization and weight management.…”

“…Wolfspeed's HPA product 12 in 2021 shows the SHS and THS values are 28 dBc and 39 dBc, respectively. In our previous research, 6 HSs of more than 41 dBc was achieved through two inductance‐capacitor (LC) resonances at second harmonic and third harmonic in the output matching network (OMN).…”