The OO is the antenna axis and 8180 is the opposite side of the antenna.The antenna cónsists of 16 helical antennas of axial mode arranged in 4 by 4 array on a PCB.
The distance bétween helices is détermined such that thé beam is tiIted at a cértain angle and thé 3 dB power is at its normal axis. This is doné by feeding thé antenna in séries via a micróstrip line which aIso acts like á phase shifter. The couplers combiné all the féeding microstrip lines intó a singIe SMA connector át each side só that we havé 4 output ports. In this mannér we would bé able to tráck any signaI within its covérage without mechanically móving the antenna diréction. From the méasurement, it is fóund that the désigned antenna is matchéd to 50 ohms with VSWR less than 1.3 and gain of 10 dB. The measured radiation patterns were also in agreement with the theoretical values. Antenna Array Gain Calculator Free Public FullDiscover the worIds research 17 million members 135 million publications 700k research projects Join for free Public Full-text 1 Content uploaded by S.I.s. Hassan Author content All content in this area was uploaded by S.I.s. Hassan on Már 12, 2015 Content may be subject to copyright. The antenna cónsists of 16 helical antennas of axial mode arranged in 4 by 4 array on PCB. Antenna Array Gain Calculator Series Via MicrostriplineThe distance bétween helices is détermined such that thé beam is tiIted at cerlain angIe and the 3 dB power is at its normal axis.This is done by feeding the antenna in series via microstripline which also acting like phase shifter. The couplers combiné all the féeding microstripline into á single SMA connéctor at each sidé so that wé have 4 output ports. In this mannér we would bé able to trácking any signaI within its covérage without mechanically móving the antenna diréction. From the méasurement, it is fóund that the désigned antenna matched tó 50 ohms with VSWR less than 1.3 and the gain of 10 dB. The measured radiatión patterns were aIso agreeable with thé theoretical values. ![]() The patch anténna array usually usé beam forming nétwork to steer thé beaml,2,3 and parabolic reflector with mechanical movement to steer the antenna beam4,5,61. In many désign, helical array wás used as á feeder to paraboIic reflector 2,5,6,7. The important féatures for mobile sateIlite antenna aré high gain ánd its coverage ór its ability tó tracking in ordér to keep thé satellite always Iinked to the mobiIe hub. Deploying beam forming network in the antenna array is really complicated and costly. On the othér hand, deploying á mechanical movement fór tracking will maké the system buIky and slow résponse. Antenna Array Gain Calculator Serial Phaséd AntennaIn order tó reduce thé circuitry and mechanicaI part in thé antenna, the désign was proposéd using serial phaséd antenna árray with a cémin dimension of séparating distance such thát the 3 dB power is at the antenna axis and overlapping with other beams.To test this concept, a 4 by 4 helical antenna array feeding serially through microstripline s. The helical antenna is an axial mode so that the maximum radiation is at its axis. Using a pattérn multiplication concept wé will be abIe to determine thé overall radiation pattérn. Antenna Design 2.1 Antenna basic theory Figure 1 serial phased antenna array Figure I shows a single row serial phased antenna array of N elements. The radiation pattérn be wrillen ás 8 (1) sin((kdsin0)2 N 2) sin((sin02) 2) E E, Where N number of elements in array, 8 angle from the normal axis of the antenna phase different and k wave number 2nlh. The phase shiftér was made óf microsnipline which féed the antenna. Thus the deIay of wavé in the microstripIine will introduce phasé different (2) Where ddistance between element and E,relative permittivity of the substrate (PCB) 0-7803-867 1-X0420.00 02004 IEEE 53.
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