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Abstract-A research of W band microstrip integrated high order frequency multiplier based on avalanche diode is presented. The associated nonlinear model of avalanche diode driven by external RF signals for high order frequency multiplication is presented and analyzed according to the physical property of avalanche diode. Subsequently the circuit of microstrip integrated high order multiplier is analyzed. In experiment, maximum output power of 6.5 mW with the efficiency of about 0.62% is obtained at output frequency of 94.5 GHz with 15th multiplication order. The phase noise of output 94.5 GHz signal is about −90.83 dBc/Hz and −95.67 dBc/Hz at 10 KHz and 100 KHz offset.

A smart broad‐band planar antenna for wireless system is presented. The simple modeling of this antenna and design method based on equivalent circuits has been developed. An eight‐element planar array has been designed, fabricated and measured. Measured results exhibit good performance of the return loss and horizontal plane radiation pattern. The measured 10‐dB return loss bandwidth of the broad‐band planar array is demonstrated to be 62.5% and the un‐roundness of its horizontal plane pattern is less than 4.5 dB. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 2944–2946, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22925

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