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In this paper, the implementation of an X band Tx-to-Rx leakage cancellation network to achieve bandwidth improvement and high isolation performance is presented. The circuit architecture and leakage cancellation theory are described in detail. The operation principle of leakage cancellation network is based on phase cancellation technique. This architecture is made up of three two-section Wilkinson...
In this paper, a novel wideband bandpass filter is proposed using a stepped impedance stubs resonator and substrate integrated coaxial line (SICL) technology. The resonator produces three resonant frequencies and two attenuation poles near the edges of the passband, so a wide bandwidth and a sharp rejection can be obtained. A filter prototype with compact size is simulated and the results indicate...
This paper describes a four-path wideband intermediate frequency (IF) module with transceiver (TRX) functions for E-band application. To realize high capacity, the bandwidth of the IF module should be chosen considerately. The proposed IF module consists of four paths, which are combined by a combiner in the transmitter channel or separated by a splitter in the receiver channel, respectively. For...
A compact pattern reconfigurable quasi-Yagi antenna is presented. It consists of a driven element, which is simply realized by a microstrip monopole and only one parasitic element with four PIN diodes integrated on the arm. The effective electrical length of the parasitic element is controlled by changing the biasing voltages. This configuration allows two end-fire patterns with relatively high gain...
A Ka-band reflectarray consists of modified cross loop is investigated in this paper. The reflectarray consists of 30 × 30 unit cells and covering an area of 15cm × 15 cm. The unit cell is composed of a solid cross inside and a cross loop outside. Varying the lengths of the cross can lead to nearly 550o linear phase shift curve. Using this technique, a single layer reflectarray that has a wider bandwidth...
Limited feedback of channel state information (CSI), which is made up of rank indicator (RI), precoding matrix indicator (PMI) and channel quality indicator (CQI), is an important part in closed-loop transmission for 3GPP Long Time Evolution (LTE)/LTE-Advanced standard. In this paper, an efficient way, where PMI granularity selection method is used in PMI feedback mechanism, is presented to adaptively...
In this paper, a new conductor-backed coplanar waveguide (CBCPW) bandpass filter with U-slot defected ground structures (DGSs) is designed. Because of CBCPW structure, it is easy to be integrated with high frequency IC circuits and to do measurement work. The U-slot DGS not only provides a high Q factor, but also has a simple shape. Simulation shows that the filter has 2GHz 3dB bandwidth and 2.17-dB...
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