Question about EnGenius EOC-3220 (EOC3220)
I have 1 WIFI operated 2.4 Ghz with 20DBm transmit power radio currently uses Channel 1 / 2412MHz and attached with it one 18Dbi patch antenna. Now, I have planned to split the signal into two since I was operated only at limited area. I want to expand my signal to the other side in order some of my friends can conned to my Access-Point.
Hoping for such immediate solution to come up. Thank you very much.
To answer your question, from a single TX/RX device (your WiFi unit) to a dual antenna, what you would need as a splitter is more commonly called a "phasing harness".
A phasing harness is a balanced transmission line which is used when you want to stack or use two antennas from a single radio output. In lower frequencies it is made from a pair of 75 ohms high grade coaxial cable of equal odd quarter wavelengths of the operating frequency. The joint at the middle is connected with a “tee” connector with another cable (standard 50 ohms cable) that runs down to the radio. The free ends of the 2 75 ohms coax are then connected to the two antennas. This site shows phasing harness for multiple antennas.
For microwave region, since losses tends to be magnified, commercial grade are often used rather than home brewed. Examples are shown in this page.
Alternately and perhaps simpler is to just remove the reflector of the 8Dbi patch antenna of the EOC 3220. Normally in designs such as the 3220, the active patch antenna is soldered on one side of the PCB. At the back is another which looks just like it but slightly bigger. This is the reflector. The reflector has two (2) purposes:
1. block any signal coming in from and going to the back of the active patch antenna; and
2. reflect any back signal of the active patch antenna and re-direct it forward to effectively increase the front signal.
If you decide to remove the reflector, there will be 3 effects on the performance of your TX/RX device:
1. the front (major) lobe (roughly the front radiation pattern; maximum distance and area covered of the front signal traveled) will be greatly reduced;
2. that reduction would be translated to a rear coverage; and
3. it is highly possible that you will have small side lobes as well.
This document would give you an idea on the lobes and radiation patterns.
Posted on Oct 24, 2007
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If you are planning to use a single antenna and then use a "splitter" to connect two (2) WiFi units, I'm afraid that it will not work.
Antenna splitters are meant for receive only mode but since WiFi operates both on receive and transmit, then perhaps what you would need is a "duplexer".
Both of your WiFis would be operating on 2.4GHz band. Theoretically, you would have to fix set your first WiFi device to operate on the lowest channel possible and the other on the highest channel possible. The channel separation translates to frequency difference; lowest for Channel 1 is 2.401GHz while the highest for Channel 11 is 2.473GHz.
Constructing your own would be at best a daunting task since you would need to be very familiar with electronic components and circuitry in the microwave region. Further, you have to have access to specialized equipment (microwave capable) such as a spectrum analyzer, swr meter, dummy loaded wattmeter and a frequency counter to say the least. In most countries, you would also need certain licenses to do this.
With all of these in mind, your best bet might be to use individual external antennas for each WiFi device and positioned them as far away as possible from each other. Moreover, pls bear in mind that anything between the transmitter and the antenna would introduce attenuation, insertion and return loss and this include even just the cable.
If you would still want to
give it a try:
Good luck and kind regards.
Oct 23, 2007 | EnGenius EOC-3220 (EOC3220)
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