Organize and Share your Electronics the way you want. Sign-Up for a free account now. It takes only 30 seconds!

A prototype 2.45Ghz antenna for mobile use

A prototype 2.45Ghz antenna for mobile use

A prototype 2.45Ghz antenna for mobile use. Can be used this antenna for surveying signal strength using a variety of free wlan tools. Very simple to construct, requiring just a piece of wire, an N socket and a 100mm diameter (approx) tin lid.
The 100mm diameter lid has a hole drilled in the middle to accomodate an N type chassis socket. The socket can be pop rivited or soldered into place. The pre-shaped wire is then soldered to the centre pin of the N socket. The wire is about 1.5mm to 2mm in diameter – an old metal coat hanger was used in the prototype. The coils are 11mm inside diameter. Measuring from the groudplane, the first coil starts at 20mm, finishes at 40mm. The second coil starts at 118mm and ends at 138mm. The top of the antenna extends to 218mm. If you wish to add two more sections to this antenna, then leave 78mm of wire between the top of the second coil, and the bottom of the third. Then repeat for the forth coil, and leave the top of the forth coil extending up 80mm.

Use a pair of pliers and an 11mm drill to bend the coils. Try to ensure that the coils all follow the same turning direction although it’s not really critical. If your finding it difficult to wind the whole antenna from 1 piece of wire, then make 4 seperate antennas with the phasing coil, and solder them all together.

If you cannot find a suitable tin lid to make the ground plane from, then make wire radials that solder to the N socket. If you start with 8 radials at 45 degree spacing that should provide a good ground plane. You could also wind a spiral of wire starting at the N connector and spiraling to the outside with about 10mm spacing between turns. This will create a good ground plane and make it mechanically rigid.

For the short antenna with 2 phased elements, the gain will be around 5dBi, whilst the 4 element version will have 7 to 9 dBi of gain.

Visit Here for more.







 

More Articles to Read

App note: EPIC: Electro-Pyrotechnic Initiator Chip Resistor
App note: EPIC: Electro-Pyrotechnic Initiator Chip Resistor
App note: Noise analysis for high-speed op amps
App note: Noise analysis for high-speed op amps
Skill Sunday: Arrays
Skill Sunday: Arrays
App note: Infrared remote control implementation with MSP430FR4xx
App note: Infrared remote control implementation with MSP430FR4xx
Gesture Controlled Smart Home
Gesture Controlled Smart Home
Design for a Wideband, Differential Transimpedance DAC Output
Design for a Wideband, Differential Transimpedance DAC Output
Wrist thrusters let you fly through the water effortlessly
Wrist thrusters let you fly through the water effortlessly
Bertan/Spellman 225-20R HV power supply teardown
Bertan/Spellman 225-20R HV power supply teardown
Blinking Christmas Lights
Blinking Christmas Lights
Adjusting clock with alarm, hygrometer & thermometer on 1.8″ ST7735 display
Adjusting clock with alarm, hygrometer & thermometer on 1.8″ ST7735 display
Adding an “extra sense” with rangefinders
Adding an “extra sense” with rangefinders
This wireless game controller looks like a rug
This wireless game controller looks like a rug
How to run your ESP8266 for years on a battery
How to run your ESP8266 for years on a battery
Calibration of a 3-Phase Energy Meter Board on the ADE7754
Calibration of a 3-Phase Energy Meter Board on the ADE7754
Making beats on a tiny Arduino DJ controller
Making beats on a tiny Arduino DJ controller
Qinsi-QS5100 Sn63Pb37 solder profile
Qinsi-QS5100 Sn63Pb37 solder profile
Water Detection System
Water Detection System
Professional Hi-Fi 15W Tube Amplifier circuit
Professional Hi-Fi 15W Tube Amplifier circuit
This Arduino machine will judge how sick your ollies are
This Arduino machine will judge how sick your ollies are
Turn an old payphone into a boombox for ’90s hits
Turn an old payphone into a boombox for ’90s hits

Top


Shares