Analysis Of L/C Dual-band Shared Aperture Broadband Antenna

Dual-band Array Radar Antennas make the size and weight of antenna a great decrease,so it can be used in these Spaceborne and Shipborne systems that size and weight are restricted, and it is very favorable for improve the mobility of radar and reduce the cost of radar detection system.Based on the dual-band array radar antenna requirements, demonstrate the dual-band array antenna Overall development programme and the difficulties that need to be overcomed, and proposed the programme that use print dipole as L-band antenna array units and use broadside ridge waveguide slot antenna as C-band module. We first analysis the element characteristic of L-band, Modeling and Simulation its pattern and VSWR Characteristics using HFSS, and study its amplitude and phase weighted on the basis of work we do ago. Under the direction of pattern sidelobe request, Taylor synthesis method is used by its amplitude distribution, phase by phase as distribution under the direction of the pattern beamwidth requirements determine the number and the unit spacing of the element. Using MATLAB procedure calculate its ideal pattern after amplitude and phase are weighted. Through a certain power distribution network, we will use the designed element, taking into account the distribution of amplitude and phase , processing physical and measure it, testing performance meet to our targets, lay the foundation for the dual-band antenna overall design behind.Do a comprehensive and in-depth analysis on the C-band array unit .For the antenna pitching must do wide-angle scanning, proposing that using ridge waveguide slot as C-band module. Simulation radiation characteristics of a single slot,and design a line array antenna that meet pattern bandwidth requirements follow the five steps below:1. Calculating the cutoff wavelength of the ridge waveguide.2 .Under the direction of the pattern requirements selected aperture distribution.3.Calculate the needede slot admittance according to the selected aperture distribution.4.Ridge waveguide active admittance calculations.5.Apply active admittance calculated in Step 4 to the needed admittance calculated in Step 3.Using HFSS Modeling and Simulation a antenna in accordance with the above steps , within the bandwidth ,the performance indicators to meet requirements. Process an actual element in accordance with the simulation size. In the following work,we will measured the element.use the measurement results to guide our debugging,simulation, until it can be manufactured to meet the requirements of our target.Finally, summarizes the work this paper done: Mainly analyzed the line array of L-band and C-band . Focusing on the C-band line array analysis.This paper solve some solution in the course of antenna design.. Because of the time, Experimental verification of this issue has not been completed, at a later time, the follow-up work of this issue will be done on the basis of the work this paper.