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A compact microstrip line diplexer is reported, which is integrated into a commercial off-the-shelf package for frequency-division duplex wireless communication systems. This diplexer is designed based on the concept of stepped-impedance resonators (SIR), offering twofold advantages. First, by making use of the first two resonant modes of an SIR, the first resonator in two bandpass filtering channels of the diplexer can be shared, so that the circuit size can be reduced greatly compared to the conventional design. Second, by adjusting the impedance and length ratios of different SIRs, high out-of- band suppression can be achieved over a wide frequency range. The proposed diplexer is then assembled into a commercial package and measured with a customized test fixture. Both simulation and experiment show good results. a [ABSTRACT FROM AUTHOR]

The article offers information on the International Microwave Symposium (IMS) 2012 to be held in Montréal, Canada from June 17-23, 2012.

The article discusses the use of network analyzers to measure a third-order intercept point (IP3). It presents the detailed multiple external sources and network analyzer receiver programming techniques. It examines the functionality and effectiveness of the proposed measurement method to measure the IP3.