Design of a dual frequency oscillator for simultaneous multi-band radio communication on a multi-layer liquid crystalline polymer substrate

This paper presents the design of a dual frequency oscillator that simultaneously generates two signals of different frequencies. The dual frequency oscillator was implemented in a novel multi-layer laminate-type process technology that uses multiple layers of liquid crystalline polymer (LCP) substrate. The oscillator core employs one lumped-element second-order resonator and one lumped-element fourth-order resonator to generate 1.79 GHz and 900 MHz synchronous signals. The silicon-bipolar based dual frequency oscillator utilizes the broad-band nature of the Qs of the passives in LCP to generate signals that are spaced at least one octave away from each other