Subjects: Geosciences >> Space Physics submitted time 2016-05-03
Abstract： To realize remote sensing at sub-millimeter wavelengths,a 450 GHz sub-harmonic mixer was studied. An anti-parallel pair of Schottky diodes is the key component in the mixer. The length of the diodes is 74 mum,and the cutoff frequency of diodes is up to 8 THz. The suspended microstrip matching circuit was built on quartz,and the metal block was cut into two halves. The diode embedding impedance was calculated. The diode package and the matching circuit were integrated in the mixer model. The predicted single side band (SSB) conversion loss is 8. 0 dB,with 4 mW of local oscillator power. Measured results indicate that the lowest measured SSB conversion loss is 14. 0 dB, with 5 mW of local oscillator power. The loss is below 17. 0 dB in the band from 433 ~ 451 GHz,with a 3 dB bandwidth of 18 GHz.
Peer Review Status:
Awaiting Review
Subjects: Geosciences >> Space Physics submitted time 2016-05-03
Abstract： According to the level of domestic processing technology at present,the circuit structure of anti-parallel diodes with self-bias was proposed. With this structure, not only the difficult problem of processing bias circuit can be solved, but also the odd-order frequency multiplication can be realized efficiently. At the meantime, co-simulation approach was used to simulate the electrical characteristic of the tripler by software HFSS and ADS,including the impact of the parastics. After designing, both the machining and electrical installation are accomplished. The highest measured output power is 3.1 mW at 221 GHz and the output power is more than 2 mW at frequencies of the range 219~227 GHz. These results can provide important reference for future design of high efficiency submillimeter frequency multiplier.
Peer Review Status:Awaiting Review
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