help regarding sim340e - help me in selecting antenna

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choto

Joined: 08 Jun 2009
Posts: 5

15 Jun 2009 11:28 sim340e

hi guys,

I am new to GSM and i wnat to use sim340E GSM modem. I have to interface it with 8051 controller and have to reaceive/transmit data through GSM network. I have selected sim340E but now i am cofused about antenna. Can anybody help me in selecting antenna. What will eb a auitable choice for quad band. I ahve found one from china but it is dual band frq supported.

plz help me....i m stuck:(

GSM Man

Joined: 15 Apr 2009
Posts: 357
Helped: 46
Location: New Jersey, USA

18 Jun 2009 18:32 help regarding sim340e

Since there is nowhere where all four bands are used, I would opt for two different antennas using the one appropriate for the bands in use.

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choto

Joined: 08 Jun 2009
Posts: 5

20 Jun 2009 8:11 Re: help regarding sim340e

thnx

and what antenna length should be preffered for GSM 900/1800 MHz???shorter or longer one? I have seen one, it is half wave dipole thumb antenna(900/1800Mhz, 20ohms) with two lengths available 5cm and 10cms. i think shorter gives better reception n trnasmission. any suggestions????????????????