Broadband Wide Beam Dual Polarization Antenna Unit and Its Sparse Array

This paper presents a new type of wide-bandwidth beam antenna, which uses a relatively new type of cross-type microstrip dipole. This form has a wider −3dB beamwidth than ordinary microstrip antennas. The radiation profile uses a gradation profile and widens the bandwidth of the antenna by adding parasitic structures and increasing the air frame height. Antenna structure parameters are optimized using ANSYS HFSS. What the test results display is that the 1 port and 2 port standing wave's relative bandwidth <−7.5dB of designed antenna unit reach 35.9% and 22.8%, the central frequency E-plane and H-plane beam width are 110 ° and 91 °, respectively, which facilitates large-angle scanning. This antenna is an orthogonal two-line polarized antenna with a zenith-directional line polarization cross-polarization level of −19.55 dB. With the help of software Matlab, we use sparse Focuss algorithm obtain the antenna array composed of 64 units. The gain reaches 19.61dB when the scanning angle is 60°. It was verified that this antenna element and sparse array have good characteristics.