Title :
Microstrip antennas integrated with electromagnetic band-gap (EBG) structures: a low mutual coupling design for array applications
Author :
Yang, Fan ; Rahmat-Samii, Yahya
Author_Institution :
Dept. of Electr. Eng., Univ. of California, Los Angeles, CA, USA
Abstract :
Utilization of electromagnetic band-gap (EBG) structures is becoming attractive in the electromagnetic and antenna community. In this paper, a mushroom-like EBG structure is analyzed using the finite-difference time-domain (FDTD) method. Its band-gap feature of surface-wave suppression is demonstrated by exhibiting the near field distributions of the electromagnetic waves. The mutual coupling of microstrip antennas is parametrically investigated, including both the E and H coupling directions, different substrate thickness, and various dielectric constants. It is observed that the E-plane coupled microstrip antenna array on a thick and high permittivity substrate has a strong mutual coupling due to the pronounced surface waves. Therefore, an EBG structure is inserted between array elements to reduce the mutual coupling. This idea has been verified by both the FDTD simulations and experimental results. As a result, a significant 8 dB mutual coupling reduction is noticed from the measurements.
Keywords :
electromagnetic coupling; finite difference time-domain analysis; microstrip antenna arrays; E-plane coupled microstrip antenna array; EBG structures; FDTD method; dielectric constants; electromagnetic band-gap structures; finite-difference time-domain method; microstrip antennas; mushroom-like structure; mutual coupling design; near field distributions; substrate thickness; surface-wave suppression; Dielectric substrates; Finite difference methods; Metamaterials; Microstrip antenna arrays; Microstrip antennas; Mutual coupling; Periodic structures; Photonic band gap; Surface waves; Time domain analysis;
Journal_Title :
Antennas and Propagation, IEEE Transactions on
DOI :
10.1109/TAP.2003.817983
