Novel Broadband Reflectarray Antenna with Two-Type Elements for Millimeter-Wave Application
- PDF / 326,266 Bytes
- 7 Pages / 439.37 x 666.142 pts Page_size
- 83 Downloads / 166 Views
Novel Broadband Reflectarray Antenna with Two-Type Elements for Millimeter-Wave Application Xiao-Tian Wang & Qian-Zhong Xue & Pu-Kun Liu
Received: 3 September 2009 / Accepted: 26 April 2010 / Published online: 4 May 2010 # Springer Science+Business Media, LLC 2010
Abstract A novel broadband millimeter-wave microstrip reflectarray antenna with squareannular patches and combined patches has been presented, aiming to solve the problem of how to obtain a full 360° range of phase shifts for single-layer. The choice of these twotype elements can make the phase shift smoother and increased up to 360°, leading to broader bandwidth. Based on this technique, a single-layer microstrip reflectarray antenna operating at 94 GHz has been designed. The computed results demonstrate the agreement of the main beam steering with the design requirement, and a 1-dB gain bandwidth close to 10% is obtained. The simulation results verify the feasibility of this design. Keywords Reflectarray antenna . Two-type elements . Broadband . Millimeter-wave
1 Introduction Reflectarray antennas consist of printed elements, each functioning as a radiator and phase shifter [1] (Fig. 1). These antennas have several advantages, such as low profile and lower loss compared with parabolic reflector antennas or conventional array antennas, especially in millimeter wavebands. There are many types of reflectarray antenna rest with many kinds of elements. These include variable size microstrip patches [2], variable size dipoles [3] and identical microstrip patch elements with variable length phase delay lines with or without angular rotations [4–9]. The phasing method using variable size patches is a preferable choice in many designs due to its simplicity. But it is difficult for a single-layer reflectarray antenna to obtain a full 360° range of phase shifts. To achieve a lager phase shift, techniques such as using thin substrate for the patch, stacking multiple patches and X.-T. Wang (*) : Q.-Z. Xue : P.-K. Liu Key Laboratory of High Power Microwave Sources and Technologies, Institute of Electronics, Chinese Academy of Sciences, Beijing 100190, China e-mail: [email protected] X.-T. Wang Graduate University of Chinese Academy of Sciences, Beijing 100039, China
834
J Infrared Milli Terahz Waves (2010) 31:833–839
Fig. 1 Reflectarray antenna with frontal feed.
proposing a new kind of patch have been employed [10–12]. However, multilayer configurations are costly and generally impractical. By decreasing the substrate thickness, a larger phase variation can be achieved. However, the bandwidth becomes narrower. The configuration of the new kind patch is so complex that it is difficult to be manufactured. In this paper, a novel broadband millimeter-wave microstrip reflectarray antenna composed of two-type elements of variable sizes is proposed. The choice of these twotype elements can make the phase shift smoother and increased up to 360°, leading to broader bandwidth. In order to validate the phase data, a single-layer microstrip reflectarray antenna operatin
Data Loading...
