Fully Integrated CMOS Low-Gain-Wide-Range 2.4 GHz Phase Locked Loop for LR-WPAN Applications

Non

A Reconfigurable Microstrip Patch Antenna with Polyphase Filter for Polarization Diversity and Cross Polarization Filtering Operation

A reconfigurable microstrip patch antenna with polyphase filter for polarization diversity and cross polarization filtering operation is presented in this paper. In our approach, a polyphase filter is used to obtain the four 90° phase shift outputs to feed a square microstrip patch antenna. The antenna can be switched between four states of polarization in transmission as well as in receiving mode. Switches are interconnected with the polyphase filter network to produce left-hand circular polarization, right-hand circular polarization, horizontal linear polarization, and vertical linear polarization. Additional advantage of using polyphase filter is its filtering capability for cross polarization filtering in right-hand circular polarization and left-hand circular polarization operation. The theoretical and simulated results demonstrated that polyphase filter is a good candidate to drive microstrip patch antenna to accomplish polarization diversity and cross polarization filtering operation

A low phase noise CMOS quadrature VCO for 2.4 GHz bluetooth/WLAN applications

International audienc

A CMOS adaptive RF front-end receiver for wireless applications

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Low-cost and low-power open-loop frequency synthesizer

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Low-cost and low-power open-loop frequency synthesizer

International audienc

A very low phase noise fully integrated quadrature LC oscillator for 2.4 GHz band applications

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Design of fully-integrated RF front-end for large image rejection and wireless communication applications

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A full-CMOS Image rejection RF front-end receiver with tunable polyphase filter

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A very low phase noise fully integrated CMOS quadrature LC oscillator for 2.4 GHz Bluetooth/WLAN applications

International audienc