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A new slow-wave microstrip line made of a ferromagnetic semiconductor (FMS) substrate is proposed and its characteristics discussed. It is shown that this structure has more desirable and flexible guided wave properties than the conventional metal-insulator-semiconductor (MIS) microstrip line.
A compact and lightweight 4GHz linearizer for satellite TWTA has been developed by using MIC packages with chip devices. It consists of preamplifier, predistortion linearizer and limiting amplifier. It improves the noise power ratio for FM system by 3dB and required C/N for INTELSAT TDMA system by 4.5dB. The space environmental test and aging test are successfully performed.
Spectral Domain Technique has been applied to analyze multiconductor, asymmetric slow-wave microstrip lines. It is observed that slow-wave factor of odd mode of coupled microstrip lines may be equal to or larger than that of even mode under appropriate conditions. This presents the flexibility to realize a large variety of passive components, such as directional coupler, phase shifter, power combiner/divider.
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