A Low VSWR and High Efficiency Waveguide Feed Antenna Array

Abstract

A low VSWR and high efficiency antenna array operating in the Ku band for satellite communications is presented in this paper. To achieve high radiation efficiency and broad enough bandwidth, all-metal radiation elements and full-corporate waveguide feeding network are employed. As the general milling method is used in the multilayer antenna array fabrication, the E-plane waveguide feeding network is adopted here to suppress the wave leakage caused by the imperfect connectivity between adjacent layers. A 4 × 8 elements array prototype was fabricated and tested for verification. The measured results of proposed antenna array show bandwidth of 6.9% (13.9–14.8 GHz) for VSWR < 1.5. Furthermore, antenna gain and efficiency of higher than 22.2 dBi and 80% are also exhibited, respectively.

Corporate‐fedadvanced microstrip arrays with improvedcross‐polarisolation: Design and engineering usingDGS‐integrationtechniques

“…In summary, it can be found that, in an array there are three primary sources of XP radiations, namely (1). the RF interface for launching the energy into the array, (2). the discontinuity in the feed networks and (3).…”

“…While the properties of individual element, mode of excitation, and physical arrangements are the determining factors in designing an array, feed network is an important point of consideration based on power handling and tolerable loss. [1][2][3][4][5][6][7][8][9][10] The microstrip-feed has well-known advantages for its compactness, low-profile, and low-cost; but its ohmic loss, radiation losses from junctions and discontinuities limit the achievable gain and cross-polar (XP) isolations. [10][11][12][13][14][15] XP radiations in microstrip-fed array and its control is the primary focus of this investigation.…”

“…Communication systems demand antennas with high‐gain and polarization purity at low‐cost and microstrip arrays are an optimum choice. While the properties of individual element, mode of excitation, and physical arrangements are the determining factors in designing an array, feed network is an important point of consideration based on power handling and tolerable loss 1–10 . The microstrip‐feed has well‐known advantages for its compactness, low‐profile, and low‐cost; but its ohmic loss, radiation losses from junctions and discontinuities limit the achievable gain and cross‐polar (XP) isolations 10–15 .…”