Which antenna is the best for 750MHz frequency?

[engurucuklu]

Which Antenna for 750MHz

For antenna lab our group get 750~MHz antenna design. We will get point according to efficiency. we considered microstrip antenna but to tell the truth we don 't know from which we can get enough result. For this frequency which type antenna should we use.

regards,

 

[mdturan20002000]

Re: Which Antenna for 750MHz

I think you would prefer Microstrip antenna. Because it is cost-effective and i think your teacher likes this design choice. And you can find kinds of examples in net for 750MHz design with interesting appearance.

good lucks,

 

[sergio mariotti]

Re: Which Antenna for 750MHz

efficiency? what do you mean for efficiency?
If do you mean the omhic loss, so µstrip and other antenna may be good enough.
If you mean illumination efficiency (when you'll use as reflector illuminator) as large the antenna is , as efficently is. In this case a NON dielectric based antenna is better. Think to the dipole or the log-periodic, or the chocked horn (the best one).

 

[MACRF]

Re: Which Antenna for 750MHz

well i recommend u next way ,, u must use for best result antenna long as 7500/750x4=40 sm ( antenna length=radio wave) or just 1/2 =20 sm or 1/4 length wave =10 sm( but 20 sm is 2 time less , for 10sm length power output is less about 4-8 time i forget how much less exactly) , u must connect one antenna to the RF out , other antenna in the same length u must connected on ground , and u must make orientation for both antennas on a same axis and parallel , also for good receive u must have the same antenna on receiver and much better if antennas on receiver and transmitter u made orientation parallel . formula for calculated length of antenna is -- L=7500/Fx4 ....where F = frequency in MHZ , L = length of antenna = length of radio wave.... material for antennas i recommend u Copper or Brass tube , diameter of tube about 0.3-0.8 sm this is for best result for best distance ..and sorry for my english .best regards

 

[engurucuklu]

Re: Which Antenna for 750MHz

"mdturan20002000","sergio mariotti","MACRF". Thanks for your interest.

I mean omhic loss and SWR for efficiency. We asked our teacher and he approved µstrip. Frankly speaking i want to design interesting one. i think µstrip can answer our need.

If you design any Microstrip antenna before, can you say at which point i must be careful for good job.
with starting construction, i think i understand lots of unknown point.

thanks in advance.
with regards,

 

[bsiswoyo]

Re: Which Antenna for 750MHz

Try yagi antenna 13dB, 12 element

This is a geometry of antenna

NOTES Automatically produced by first
FREQUENCY 750.000000
MIN_FREQUENCY 749.000000
MAX_FREQUENCY 751.000000
STEP_FREQUENCY 0.100000
ELEMENTS 12
DRIVEN 1
PARASITIC 11
ANGULAR_STEP 180.000000
#DATA_DRIVEN x y length diameter voltage(r) voltage(i)
DATA_DRIVEN 0.08000 0.00000 0.18384 0.00300 1.00000 0.00000
#DATA_PARASITIC x y length diameter
DATA_PARASITIC
0.00000 0.00000 0.19263 0.00300 reflector
0.11000 0.00000 0.17257 0.00300 D1
0.18200 0.00000 0.17076 0.00300 D2
0.26800 0.00000 0.16859 0.00300 D3
0.36800 0.00000 0.16642 0.00300 D4
0.48000 0.00000 0.16498 0.00300 D5
0.60000 0.00000 0.16317 0.00300 D6
0.72600 0.00000 0.16209 0.00300 D7
0.85800 0.00000 0.16064 0.00300 D8
0.99600 0.00000 0.15992 0.00300 D9
1.14000 0.00000 0.15920 0.00300 D10

This is a performance of antenna

# Driven=1 parasitic=11 total-elements=12 design=750.000MHz
# Checked from 749.000MHz to 751.000MHz.
f(MHz) E(deg) H(deg) R jX VSWR Gain(dBi) FB(dB) SideLobes(dB)

749.000 37.7 41.3 36.93 -12.11 1.509 13.761 18.808 0.000
749.100 37.7 41.3 37.01 -12.05 1.505 13.766 18.785 0.000
749.200 37.7 41.3 37.08 -11.99 1.502 13.771 18.763 0.000
749.300 37.7 41.3 37.16 -11.94 1.498 13.775 18.740 0.000
749.400 37.7 41.2 37.24 -11.88 1.494 13.780 18.717 0.000
749.500 37.7 41.2 37.32 -11.83 1.490 13.785 18.694 0.000
749.600 37.7 41.2 37.39 -11.77 1.486 13.790 18.670 0.000
749.700 37.6 41.2 37.47 -11.72 1.483 13.795 18.647 0.000
749.800 37.6 41.1 37.55 -11.67 1.479 13.800 18.623 0.000
749.900 37.6 41.1 37.63 -11.62 1.475 13.804 18.599 0.000
750.000 37.6 41.1 37.71 -11.57 1.472 13.809 18.575 0.000
750.100 37.6 41.1 37.79 -11.52 1.468 13.814 18.551 0.000
750.200 37.6 41.1 37.87 -11.47 1.464 13.819 18.526 0.000
750.300 37.5 41.0 37.95 -11.42 1.461 13.823 18.502 0.000
750.400 37.5 41.0 38.03 -11.37 1.457 13.828 18.477 0.000
750.500 37.5 41.0 38.11 -11.32 1.454 13.833 18.452 0.000
750.600 37.5 41.0 38.19 -11.28 1.450 13.837 18.427 0.000
750.700 37.5 41.0 38.27 -11.23 1.447 13.842 18.402 0.000
750.800 37.5 40.9 38.35 -11.19 1.443 13.847 18.377 0.000
750.900 37.5 40.9 38.43 -11.14 1.440 13.851 18.351 0.000
751.000 37.4 40.9 38.51 -11.10 1.436 13.856 18.326 0.000

 

[oxygen007m]

Re: Which Antenna for 750MHz

thanks bsiswoyo
is there a good source book or other technical sheet for calculation and design of yagi antenna arrays ?

 

[bsiswoyo]

Re: Which Antenna for 750MHz

Hello,

If you need the free software please visit http://www.g8wrb.org/yagi/.

This software can running in LINUX and WINDOWS.