The strip-line fed planar array antenna for satellite-TV reception

Abstract

After historical launch of the satellite, Mukungwha, in 1995, a television Broadcasting service via a DBB is already popularized in Korea because DBS broadcasting has the advantages of high quality, simultaneity, wide coverage and so on. For the effective reception of DBS broadcasting signal, the antenna with high performance such as high gain and good polarization purity is required. Such technical specifications can be met by conventional reflector antennas. However, reflector antennas are rather bulky to handle and heavy. For that reasons, in recent years, the interest for microstrip antennas which are small size, low weight and easy to fabricate has been increased, and several microstrip antennas for satellite-TV reception have been developed vigorously. Korean DBSs situated at 116 degrees of east longitude use LHCP, Ku-band, from 11.75GHz to 12GHz. And they radiate the signal on the power 59.4dBW. In order to receive the signal by the microstrip antennas, minimum antenna gain has 19dBi. Also high polarization purity and considerable SLL are required. In this thesis, according to these requirements, and by using the foam for the purpose of low cost, two types of stripline fed slot arrays are designed and fabricated. And, by the measurement of the antennas, the antenna performances are confirmed. One type of the arrays is stripline fed slot array with rectangular slot array with upper ground plane, and the other is strip-line fed stacked slot array with parasitic patch and other segments to improve axial-ratio performance. The stripline fed structure has the major advantage of low radiation loss in the feed network. So the structure is very attractive to the planner arrays in this thesis using styrene foam with very low dielectric constant(nearly $\epsilon$, ≒1). One of the two arrays, stripline fed slot array has the impedance Bandwidth 13.8%, 3dB axial-ratio bandwidth 4.2%, and maximum gain 25.6dBi at 11.8GHz. And the other one, stripline fed stacked...