A mutual coupling reduction antenna design for WLAN MIMO application is proposed. The proposed antenna array consists of two rectangular patch antennas, six parallel metal strips, a single substrate layer, and common ground plane. About −42 dB mutual coupling is achieved at the 5.8 GHz resonant frequency. Both simulation and measurement results confirm improvements in mutual coupling at about 30 dB when compared with those without metal strips. The radiation patterns are almost unaffected by adding these metal strips in the proposed antenna.

In this letter, a novel compact quad-band microstrip circular slot antenna using edge-feeding is proposed to support the four wireless communication bands of GPS1.575 (1.525-1.625 GHz), WIMAX3.5 (3.3-3.6 GHz), WLAN2.45 (2.4-2.485 MHz)and WLAN5.2/5.8 (5.15-5.825 GHz). To expand the bandwidth of the GPS band and induce the WIMAX/WLAN band to support quad-band applications without affecting the compactness of the proposed antenna, a good method of implanting two T copper slices at the inner boundary of the two circular slots respectively is adopted. By adjusting the diameter of the two circular slots and the size of the T-shaped patch, resonant frequencies and bandwidth of the antenna are controlled and the multiple operating bands are achieved. In order to further reduce the size of the antenna that an edge-fed technology is used. This antenna has a simpler structure for realizing quad-band characteristics. Then, a prototype of the proposed antenna was successfully implemented, and good radiation performance is observed in all desired bands.

No abstract

To meet the required precision and reliability for global positioning systems, a probe-feed dual-band circularly polarized (CP) microstrip antenna is proposed. This new microstrip antenna design uses a circular patch that is printed on a two-layer substrate consisting of an FR4 dielectric layer and a foam layer, and cutting a crossed-slot and an open ring-slot in the circular patch. When compared with the conventional dual-band CP antenna with two patches among substrate materials, not only is the performance of the antenna improved but also its fabrication becomes easier. The simulated and measured results indicate the validity of the design.

No abstract