Fabry-Perot Resonator Antenna for Millimeter-Wave Wireless Communications

Project: Research

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Description

With the rapid development of wireless communications, wireless technology has undoubtedly become part of our daily lives. Today, the operating frequency of modern wireless systems is steadily shifting upward to the millimeter-wave band (f > 20 GHz) to provide a much wider bandwidth, avoid interference with the overcrowded lower frequency spectrum, reduce the system size, and have better penetration through fog and heavy dust.In wireless communications, the antenna plays a very important role because it directly affects the signal transmission and reception. Recently, the Fabry-Perot (FP) resonator has been used in millimeter-wave antenna designs, but primary attention has been paid on its focusing function that enhances the antenna gain. However, low-gain or broad-beam antennas are preferred for certain applications, such as for mobile communication systems. In this project, the researchers propose to design millimeter-wave antennas using the FP resonator as a non-focusing element. The proposed antenna, called the FP resonator antenna (FPRA), provides a wider beam than in the previous studies. The FPRA has two major advantages. First, it has a very simple structure that consists of two reflective mirrors only and, second, its size is not too small even at millimeter-wave frequencies. The latter is very attractive because fabrication tolerance is a well-known problem at millimeter-wave frequencies.Differential circuits have been extensively used in wireless communications to increase the signal-to-noise ratio. It is therefore highly desirable to use the differentially fed antenna that can be integrated with transceiver circuits directly. Thus far, however, no work on the differentially-fed FPRA has been reported. In this project, the differentially fed FPRA will be designed and verified by measurements.In some applications, such as satellite communications, circular polarization (CP) is commonly used because the polarization of a signal may be changed during its propagation. This project also investigates the CP FPRA for the first time.To make the FPRA usable in various millimeter-wave systems, FPRAs using different feeding schemes will be investigated, including the coaxial-probe, hollow-waveguide, and printed-feedline excitation methods. The first feeding scheme allows the antenna to be connected to a coaxial cable directly, whereas the second one is very important for low-loss millimeter-wave systems. The last feeding scheme is useful for direct integration with active/passive circuits. Design curves will be generated to help antenna engineers design the FPRAs easily and quickly.

Detail(s)

Project number9041497
Grant typeGRF
StatusFinished
Effective start/end date1/11/0930/01/14