| Related theories and practical circuit design of Integrated RF Frond-End which has application in satellite navigation communication handset are presented in this paper. After serious analysis and detailed design of the structure of the RF Frond-End, The designs of key components (dual-band circularly polarized antenna, RF power amplifier, low noise amplifier) are focused on.This paper includes four main parts: collectivity structure design, antenna design, RF power amplifier design and the design of low noise amplifier. The EMI performance of the whole framework is considered while designing the unitary structure. The circuits of RF Frond-End are divided into several parts which work as modules. We choose devices and make circuit topology according to the main demands of technique performances; miniaturization and integration are also taken into account. While designing the antenna, we choose the kind of microstrip patch antenna. HFSS is used for simulation in order to estimate the dimension of the antenna. After debugging and tuning, fine circularly polarized performances and excellent isolation are achieved. We use the software MWO for simulation helps to design the RF power amplifier match network. Due to carefully choice of FETs and using of two-stage cascades, finally we got 10 Watts output power which meets the demand. MMIC are selected to design the low noise amplifier circuits owing to the small dimension, low noise figure and simple peripheral bias circuits. After debugging the noise figure of the amplifier NF<1.8dB, goes with about 39dB associate gain. |
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