Summary
International Symposium on Antennas and Propagation
2012
Session Number:1B3
Session:
Number:1B3-5
Design of Microstrip Antennas fed by Four-microstrip-port Waveguide Transition with Slot Radiators
Daiki Kawase, Kunio Sakakibara, Kazuyuki Seo,
pp.-
Publication Date:2012/10/29
Online ISSN:2188-5079
Summary:
Millimeter-wave antennas have been developed for various applications such as broadband highspeed wireless communication systems and automotive radar systems. Microstrip antennas are more advantageous than other millimeter-wave antennas at the viewpoints of low profile and low cost. On the other hand, feeding loss due to transmission loss of microstrip line is significant problem in array feeding. So, microstrip array antennas are suitable for relatively low gain applications such as a subarray of digital beam forming (DBF) systems. A comb-line feeding system is effective at the point of relatively low loss compared with other microstrip patch array antennas (MSA) fed by parallel or ordinary series feeding. Travelling wave array antenna has a significant problem that gain is degraded due to beam shift in frequency changes when the array antenna is fed from one end of the feeding line. A center feeding microstrip comb-line antenna (MSCLA) is one of the solutions to reduce the gain degradation due to frequency change. However, a blank area exists at the center above the microstrip-to-waveguide transition in the aperture radiation distribution, which causes elevation of sidelobe level (SLL). To fill the radiation source in the blank area, we designed four-microstrip-port waveguide transition with slot radiators. We proposed the center feeding 2 x 2 MSA and 2-line 6-element MSCLA fed by the transition in this paper. We compared simulated radiation patterns of antennas with slot radiators and without slot radiators in the computer analysis. This document gives formatting instructions for authors preparing manuscripts for ISAP2012. The authors must follow the instructions given in this document. Entire document should be in Times New Roman Font with single space.