The following article describes two different antennas, which were designed for operation at 868 MHz close to the human body. A patch antenna on ceramic substrate with a high dielectric constant and a planar inverted F-antenna

WiFi USB dongles still draw some attention in the scope of wireless LAN device technologies, especially regarding the design of the radiator, which must be compact. The present work proposes a compact planar IFA-based antenna for a dualband USB WiFi dongle. The design of the antenna was numerically assisted using the antenna analysis software Empire XCcelTM. Experimental validation was achieved assembling and testing a prototype under practical conditions such as the influence of the dongle case, and the effect of plugging the USB stick in different positions alongside a typical laptop. Overall, the antenna complied well with the design constraints, notably regarding the good frequency stability of the impedance match

No abstract

Among the present technologies for WLAN devices, USB dongles still play a noticeable role. One major design challenge regards the antenna, which unavoidably has to comply with a very small volume available and sometimes should also allow multiband operation. In this scope, the present work discusses a dual-band WiFi compact planar IFA-based antenna design for a low-cost USB dongle application. Like most of the related published solutions, the methodology for deriving the present proposition was assisted by the use of an antenna analysis software. A prototype was assembled and tested in order to qualify the radiator design. Practical operation conditions were considered in the tests, such as the influence of the dongle case and the effect of the notebook itself. The results complied with the design constraints, presenting an impedance match quite stable regardless of the stick position alongside a laptop base.

The main focus of this work is the design of a Ka band circularly polarized planar array antenna. The design is based on slotted waveguide structures which offer an advantage of lower mechanical height that is well suited for nomadic terminals to communicate with satellites. Slotted waveguides also seem to exhibit relatively lower losses in the feeding network and their applications have been found in high power and planar array structures. The antenna is designed for the reception of satellite link (19.7-20.2 GHz)