S-Space College of Engineering/Engineering Practice School (공과대학/대학원) Dept. of Electrical and Computer Engineering (전기·정보공학부) Others_전기·정보공학부
Reflection coefficient calculation of a feeder structure in a RLSA
- Kang, Nam Koo; Kim, Seong Cheol; Nam, Sang Wook
- Issue Date
- IEEE Antennas and Propagation Society International Symposium, vol. 3, pp. 538-541, 2002
- RLSA(Radial line slot antenna) is slotted waveguide array antenna which is proposed for
the DBS(Direct Broadcast from a Satellite) reception.
Theoretically, it has lower conduction loss and higher effectiveness than the planar antenna
using microstrip. DL-RLSA(Double-layered RLSA) uses radially inward travelling wave
for the slot excitation in the double-layered radial line. The effectiveness of DL-RLSA is
more than 75%(33.0~37dBi), which is two times as high effectiveness as other planar
antenna. In spite of that advantage, SL-RLSA(Single-layered RLSA) is more popular
because of the complex structure of DL-RLSA. But the radially outward travelling wave of
SL-RLSA makes high tapering when the travelling wave approaches the aperture edge. To
remove these troublesome thing, a effective feeder structure which has tilting rod is
proposed in this paper. To find the optimum height and tilting angle of the feeder, the finitedifference
time-domain(FDTD) method is employed. In other words, the simulation
parameter of the FDTD algorithm is the dimension of feeder.
Compared with the effectiveness of the conventional rod feeder structure, that of the
proposed feeder structure in this paper is enhanced by 5dB.
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