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A topology is proposed for designing a low-cost microwave oscillator. This new feedback oscillator makes use of a substrate integrated waveguide (SIW) cavity that acts as a frequency selector as well as a feedback-coupling device. The oscillator is stabilized by using an injection-locking scheme. A 12.02-GHz oscillator prototype was designed. Experimental results for phase noise, locking range, and quality factor of the new circuit are presented. An external of 178 was measured.Index Terms-Cavity, feedback oscillator, phase noise, substrate integrated waveguide (SIW).

A substrate integrated waveguide (SIW) cavity directly coupled to a planar circuit, i.e. microstrip line or coplanar waveguide, is presented. Different coupling topologies and coupling probes are discussed. Empirical equations to predict the resonance frequencies of the cavity are provided. A temperature stability and tolerance analysis of the cavity is also discussed. A number of prototypes of cavities with different coupling topology were fabricated and measured. Finally, as an example ofpotential applications, a filter using two SIW cavities was designed and measured.

Absrrarr -A new generation of high-frequency integrated circuits is presented, which is called substrate integrated circuits (SICS). Current state-of-the-art of circuit design and implementation platforms based on this new concept are reviewed and discussed in delail. Different possibilities and numerous advantages of the SICS are shown for microwave, millimeter-wave and optoelectronics applications. Practical examples are illustrated with theoretical and experimental results for substrate integrated waveguide (SIW), substrate integrated slab waveguide (SISW) and substrate integrated non-radiating dielectric (SI") guide circuits. Future research and development trends are also discussed with reference to low-cost innovative design of millimeterwave and optoelectronic integrated circuits.

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