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Two lumped element baluns designed using embedded inductors and capacitors are discussed in this paper. The structures designed for WiFi and mobile WiMAX applications have very small form-factors with surface area of 3 mm2 or less making them ideal for portable wireless communication devices such as mobile internet devices and ultra-mobile personal computers. The baluns, fabricated as part of a multi-layer FCBGA package substrate, also display very good electrical performance. The measured insertion loss and phase imbalances were lower than -0.85 dB and 3 degrees respectively for some implementations.
Date of Conference: 27-30 May 2008