| 摘要 |
PROBLEM TO BE SOLVED: To miniaturize portable terminal equipment by reducing the circuit scale, power consumption and the cost while sufficiently achieving the effects of a space diversity reception system. SOLUTION: Level diagram design is performed so that the total NF and total Gain of reception signals from the antenna input terminals of antenna branches 1A and 1B to a synthesizer 7 can be made equivalent under the consideration of the insertion loss of a duplexer 2 or a band filter 3, the NF and Gain of low noise amplifiers 4 and 5, and the insertion loss of a delay 6. |
