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This paper proposes a signal generator that simultaneously generates multiple frequencies while using the same set of passive components. The first example demonstrates the capability of simultaneously generating 2.45GHz and 5.2 GHz (WLAN aiblg). Additionally, an oscillator capable of concurrently generating 900 MHz and 1.9 GHz (GSM and DCS-1800 hand) is also presented. This paper uses the theory of multi-resonant passives and shows their immediate effects on different topologies of signal generators that generate signals for two or more frequency hands. In addition, measured and simulated results of individual blocks of such a simultaneous signal generator, such as, filters, individual oscillators, and feedback networks, are demonstrated.

Baluns operating at multiple frequency bands can result in a reduction in the size of multiband RF front-ends. This paper presents novel multiband balun topologies, using both distributed as well as lumped components. Using LCP packaging technology, baluns operating simultaneously at the 930 and 2000 MHz frequency bands have been fabricated. Measurements show -14.5 dB and -32.4 return loss in the lower and upper bands. The phase and amplitude imbalances are less than 2.5" and 0.6 dB in each hand.

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The use of high performance Integrated Passive Devices (IPD) allows an optimum solution in the tradeoff between integration and flexibility for design modification. The paper presents the integration of sub-circuits into IPD's for WLAN and distributed broadcasting satellite (DBS) applications on Liquid Polymer Crystal (LCP)-based organic substrate technology. An integrated diplexer-coupler-harmonic filter for dual-band WLAN applications and a diplexer-balun chipset for DBS applications are presented. The WLAN IPD measures 5x6mm, exhibits directivities of 27dB and 16dB in the 2.4GHz and 5GHz band, and provides 45dB of second harmonic rejection. The DBS diplexer provides 45dBc rejection. Finally, the 2xl.25mm DBS balun utilizing high-inductive coupling shows a measured amplitude and phase balance of 0.5dB and 50 and a minimum return loss of 10dB.

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