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This metal mounting tag is basically a dipole-type antenna on a polypropylene (PP) substrate, a low-loss material with epsivr=2 and tandelta=0.006 at 900 MHz, backed with a ground plane. Thus, we have designed a high efficient tag antenna to be mounted on a metal object or any other object. This metal mounting tag antenna has a high gain, light weight, compact size, and low profile very suitable for RFID applications to tag various objects, particularly on metal surfaces.

A planar chip antenna integrated with a low noise amplifier (LNA) for GPS applications at 1.575 GHz is presented in this paper. Software packages, XFDTD and HFSS have been applied to design the chip antenna having dimensions of 10 mm (L) times 8 mm (W) times 0.8 mm (H). An insert molding approach is applied to manufacture the antenna, where meandered metal strips are enclosed with liquid crystal polyester (LCP) to form the chip antenna. Thus, this chip antenna comprises a radiating structure of multiple meandered conducting strips packed with an LCP dielectric composite material to achieve size, performance characteristics and cost effectiveness superior to conventional GPS ceramic patch antennas. The compact surface-mount chip antenna is fully compatible with hand- and reflow- attachment processes. Also, no additional impedance-matching circuit is required so that the occupied length of the antenna built in a GPS receiver operating at 1.575 GHz is just 10 mm.

The key characteristics of the planar UWB chip antenna are summarized in the following: This chip antenna has a low profile, light weight, and compact size. Antenna patterns are omnidirectional, linearly polarized and with high efficiency. The input has 50Omega characteristic impedance and is impedance-matching free with a wide bandwidth. It can be surface-mounted for a compact SMD package. With the LCP insert molding technology, this chip antenna is highly stable with variations in temperature and humidity, and also very cost-effective to have superior performances for applications in the lower commercial band of the UWB system. This chip antenna can be embedded in a variety of portable devices.