Need help designing an Antenna!

From: "zoti" <zoti@xxxxxxxxxxxxxxxxxxxxxxxxx>
Date: Fri, 21 Apr 2006 19:01:52 -0500

Hi,

I'm trying to design a replacement antenna for a GSM phone. One that
will cover 850MHZ, 900MHZ, 1800MHZ and 1900MHZ (Quad band GSM).

Doing a bit of reading on the internet I came up with an antenna that
is made out of a piece of wire at 1/4 length of the average frequency
(1350MHZ). The antenna is just over 5CM (2 inches) long.

It seem to work fine and I get good reception with the phone but here
are my questions.

- Do I need to take anything else into consideration? Like the
material the antenna is made of?

- Did I even do my calculations right?

Thanks,
zoti

.

Follow-Ups:
- Re: Need help designing an Antenna!
  - From: Sunkist

Prev by Date: Re: ANL circuit
Next by Date: trends in op-amp packages
Previous by thread: ANL circuit
Next by thread: Re: Need help designing an Antenna!
Index(es):
- Date
- Thread

Relevant Pages

Re: At sea internet
... usage, i.e. email, internet surfing, both or more? ... internet surfing at the same time while offshore. ... Card for the last 3 years, Sprint does not use GSM so i could not ... to add an antenna to an internal wireless card ...
(rec.boats.electronics)
Re: At sea internet
... you about a high-speed internet system that will support VoIP, ... I use the new 3G HSDPA wireless from Sierra wireless Aircard 860 with my ... I have had the NEW 3G system for 4 months befor i use Sprint PCS Data Card ... antenna to an internal wireless card ...
(rec.boats.electronics)
Re: Breaking news: long distance wifi ;-)
... WiFi has enabled laptop users to connect to the Internet on the go. ... Berkeley's Intel Research Lab. ... The key to that is this prototype antenna. ...
(alt.internet.wireless)
Re: rooftop antenna range
... the group concern itself with moving a users packets on the wireless ... If someone wanted to route to the internet they would have to ... Or if the plastic case would detune the antenna too much maybe ... I've found the built-in Wi-Fi antenna in the ThinkPad T30 to be far more ...
(alt.internet.wireless)
Re: stealing wireless from weak signal
... behavior pays in the long run. ... line+ADSL for internet access. ... Many wireless cards have external antenna connectors. ... If that's not possible, a 2nd wireless device, mounted near the ...
(alt.internet.wireless)