ABSTRAKSI: Antena Hexagonal Omnidireksional merupakan suatu antena yang
tersusun atas 6 buah saluran trafo
4
l
terbuka yang diparalel impedansi
masukannya secara meradial sehingga berpola radiasi omnidireksional. Pola
pancar tersebut diperoleh dari masing-masing saluran yang mempunyai pola
radiasi unidireksional. Antena ini dirancang pada wilayah frekuensi 1500 MHz –
2500 MHz dengan penyepadan binomial satu tingkat. Antena ini menggunakan
trafo ferit agar transisi yang dihasilkan bagus.
Untuk mengetahui performansi dari antena ini maka diperlukan suatu
mekanisme pengukuran. Pengukuran meliputi pengukuran VSWR, lebar pita
frekuensi, gain antena, pola radiasi, dan polarisasi. Dari hasil pengukuran yang
telah dilakukan, didapatkan lebar pita frekuensi dengan batas VSWR £ 1.5
sebesar 821.33 MHz pada frekuensi perancangan, gain yang diperoleh sebesar
9,127 dBi, pola radiasi omnidireksional, dan polarisasi mendekati linier. Hasil
yang diperoleh sudah memenuhi spesifikasi yang diinginkan, hanya bandwidth
dan polarisasinya kurang sesuai dari spesifikasi, tetapi sudah termasuk pita lebar.Kata Kunci : -ABSTRACT: Omnidirectional hexagonal antenna is the antenna that consist of 6 lines of
opened
4
l
transformer which its input impedance is paralled radially, so it has
been pattern as omnidirectonal. The radiation pattern obtained from each line
which has a unidirectional radiation pattern, by the total amount of 6 lines
produced an omni directional radiation pattern. This antenna designed at the
frequency range 1500 MHz – 2500 MHz with one stage binomial matching. This
antenna uses a ferit transformer in order to produce a smooth transition.
To deeply know the performance of this antenna it really needs a
measuring mechanism. The measuring involving measure the VSWR, frequency
bandwidth, antenna gain, radiation pattern, and polarization. From the measuring
result that had been done, obtained bandwidth with the limit of VSWR 1.5 is
821.33 MHz at the design frequency, gain obtained about 9,127 dBi, the radiation
pattern is omni directional, and the polarization approach to linier. The obtained
result has fulfill the required specification, except for its bandwidth and
polarization which are unappropriate enough from the specification, but it’s
already categorized in the wide band.Keyword: -