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10GHz FMCW Sensor RF Frontend ModuleT.-Y. Huang, T.-M. Shen, K.-F. Hung, C.-C. Chang, J.-W. Chen, H.-S. Wu, S. Wang, Prof. R.-B. Wu, Prof. C.-K. Tzuang, Prof. T.-L. Wu, Prof. Y.-C. Lin, Prof. Y.-C. Ru, and Prof. H.-C. RuAbstractA novel RF frontend module for X-band frequency modulated continuous wave (FMCW) sensor is presented. A multifunction RFIC chip1 realized by typical 1P6M 0.18 μm deep n-well CMOS technology, a multilayer 180° hybrid2 and two embedded ring filters3, two sets of antennas, and all other necessary components are all integrated into a miniaturized module, as shown in Fig. 1. The simplified block diagram of the module is shown in Fig. 2. In addition to the 3.5dBm transmitter output and 6dB receiver conversion gain of the RFIC block, a 7.5dB-gain cavity backed single arm fractional spiral antenna4 element is developed for maximizing the detection range within the volume limit of the module. Besides the basic functionality of distance detection, angle detection is also accomplished by comparing the sum and difference patterns of an antenna element pair at receiving end. Each building block has been tested individually, as shown in Fig. 3, Fig. 4, and Fig. 5 for verifying the functionality of the whole module. Good agreements between simulations and measurements have been obtained. Fig. 6 shows the measurement setting of the module. Fig. 1. 10GHz FMCW radar sensor RF frontend module.  Fig. 2. Block diagram of 10GHz FMCW radar sensor RF frontend module.  Fig. 3. LTCC 180° hybrid.  Fig. 4. LTCC Ring Filter.  Fig. 5. Cavity backed single arm fractional spiral antenna.  Fig. 6. Measurement setting.
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