Z. Feng

A Novel Dual-Band Printed Diversity Antenna for Mobile Terminals

A novel dual-band printed diversity antenna is proposed and studied. The antenna, which consists of two back-to- back monopoles with symmetric configuration, is printed on a printed circuit board. The effects of some important parameters of the proposed antenna are deeply studied and the design methodology is given. A prototype of the proposed antenna operating at UMTS (1920-2170 MHz) and 2.4-GHz WLAN (2400-2484 MHz) bands is provided to demonstrate the usability of the methodology in dual-band diversity antenna for mobile terminals. In the above two bands, the isolations of the prototype are larger than 13 dB and 16 dB, respectively. The measured radiation patterns of the two monopoles in general cover complementary space regions. The diversity performance is also evaluated by calculating the envelope correlation coefficient, the mean effective gains of the antenna elements and the diversity gain. It is proved that the proposed antenna can provide spatial and pattern diversity to combat multipath fading.

A Novel Planar Switched Parasitic Array Antenna With Steered Conical Pattern

A novel planar switched parasitic array antenna has been proposed for wireless communication. Compared with conventional switched array antennas, this array antenna has more compact planar structure and steered conical elevation pattern. Simulation and measurement have been carried out to validate the design. PIN diodes and micro-controller unit (MCU) are used to implement a beam switching system. Experimental results show that this antenna has the capacity to provide beam switching.

Reply to "Comments on 'A Novel Planar Switched Parasitic Array Antenna With Steered Conical Pattern'"

A number of problems with p.i.n. diode switching circuits have been identified which might affect the Chen et al. results. A number of design requirements must be met to obtain ideal antenna performance. If switch activation symmetry is maintained, the centre frequency should not change. If a change in centre frequency is observed experimentally, then the cause might lie in imperfections in the switching network. Note also that if beam elevation is to be controlled, a conducting skirt can be added to the ground plane.