Ku-band Waveguide Power Transmission Components In The Development Of The Detector

The waveguide power transient system are pact items of PLA.GAD, used in one type of guided missile in the controlling and manipulating parts,having results in transmitting, detecting and testing. The system is divided into six parts, which are central waveguide, coupling, detector, filter, connection and test results.Firstly, the basic theory and specification index of the diode detector and the development of waveguide apparatus are discussed. Secondly, the way of designing on detector and modulator have been given. Considering the space limited, waveguide should be gradual-changed. Methods of transition from waveguide to detector have been also discussed. Finally, by adjusting of the fulfilled detector, the measurement results are presented at the Ku band.The target values the system should reach are: Voltage sensitive > 600mV/mW; Insert loss<0.6dB; VSWR<1.25. Experimentations in impulsion, random oscillation, circulation in temperature, salt-fog test have been passed. Because of the unstable temperature characteristic of diode, the index of voltage stability from -55℃to +85℃is hard to achieve easily. Improving ways are handled in correlative parts. The main innovative points in this paper are:1. The circuit has used the mixed integrate technique to make all the design on an Al2O3 pottery chirp. The whole circuit was assembled in a mental box of 15mm×20mm×10mm. With the technology of waveguide-to-coaxial cable the signal was coupling-out to the cavity. SMA connector was employed in RF system. Based on all the reasons forenamed miniaturization and integration have been achieved. These technologies can also be applied to the other microwave circuit to improve the performance of microwave component.2. Several types of transform from microstrip to other transmissions were expounded synoptically. And four typical detector constitutions were expatiated systematically.3. Deficiency of coupling was recuperated by replacing the microstrip type to the coaxial one. And the index point was easy to achieve. Coaxial-packaged diode was used which made the system easy to set and reliable. On basic of the design theory, it can also be used at the other frequency band.As a transmitting and controlling part of the whole system, it plays an important role. It successfully catches the index and has a balance to the lowest.