A Low-Profile Filtering Magneto-Electric Dipole Antenna Based on High-Density-Interconnect (HDI) Packaging

In this article, an easy-to-integrate millimeter-wave low-profile filtering magneto-electric (ME) dipole antenna is proposed based on organic high-density-interconnect (HDI) packaging. Due to the advantages of high density and high precision of the HDI packaging, vertically oriented folded shorted metal vias and dielectric loading are introduced in the proposed design. The height of the antenna is reduced from <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$0.25\lambda _{0}$ </tex-math></inline-formula> of conventional ME dipoles to <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$0.07\lambda _{0}$ </tex-math></inline-formula>. Furthermore, by simply loading a stub, a radiation null can be effectively introduced to achieve filtering response. For demonstration, a prototype was designed and manufactured. Measurement and simulation results are in good agreement, showing that the prototype operates at 22.4–29 GHz, achieving a stable gain of 7 dBi, low cross-polarization level of less than −18 dB, and low back radiation of less than −15 dB, as well as additional good filtering performance with return loss of 13 dB and high selectivity.