3D integration of a band selective filter and antenna for 60 GHz applications

The growing demand for higher data bit transfer has made the 60GHz band a prominent research area for the wireless community. In the United States, the Federal Communication Commission (FCC) has allocated the band of 57-64 GHz for the general public while the 57-66 GHz band covers the unlicensed band worldwide. The high frequency band promises over 1 Gb/s data rate over a short distance and enables highly compact and miniaturized systems. However, the design becomes more sensitive to errors from fabrication tolerances that can degrade the system performance drastically. In an effort to reduce these negative effects, a System-on-Package (SOP) approach is presented to integrate a band selective cavity filter and a vertical dipole antenna. The near 9 GHz spectrum of 57.24-65.88 GHz, which covers all the unlicensed 60 GHz bands worldwide, is divided into four bands of 2.16 GHz. The band selective filter has three states out of the four bands while the dipole antenna covers the entire band. The resulting system gives a gain of 3.6 dBi, 4.2 dBi, and 4.1 dBi at frequency points of 57.7 GHz, 61.2 GHz, and 64.1 GHz, which are the center frequency of each band.