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

A Cardboard Horn for 802.11b

A Cardboard Horn for 802.11b

The waveguide that feeds the horn is the bottom of a Tetra Brik. The horn is made of cardboard covered inside with kitchen aluminium foil. Four pieces of cardboard covered with aluminium foil make the horn.
The box is 42x25x25 cm (16-1/2 x 9-7/8 x 9-7/8 in.). The horn’s aperture is about 25×25 cm². The Tetra Brik bottom is about 8.5 cm (3-11/32 in.) long (the ~3 cm (1-1/8 in.) rod is at about the middle). Four pieces of cardboard covered with aluminium foil make the horn. They are about 32 cm (12-9/16 in.) long. Their big side is 25 cm (to match the box side), and the small sides match the milk box (6.5 cm and 9.5 cm, or 2-1/2 and 3-3/4 in.).

Of course, maybe it would be better to use something other than cardboard, but it was so easy. I seem to get 12 dB more than with a Ricore can (diameter ~10 cm or 3-15/16 in.). When one knows that with 6 dB one gets double the gain, here I multiply the distance by four (with one horn). With two Ricore cans, we made more than 5 kilometers.

Visit Here for more.







 

More Articles to Read

Peeqo is a desktop bot that communicates through GIFs
Peeqo is a desktop bot that communicates through GIFs
Using a Programmable Input Multiplier to Minimize Integer Boundary Spurs
Using a Programmable Input Multiplier to Minimize Integer Boundary Spurs
Serial seven segment LED display shield
Serial seven segment LED display shield
G-code controlled drawing plotter
G-code controlled drawing plotter
An Arduino round word clock
An Arduino round word clock
The Sandwich-o-Matic will make your lunch automatically
The Sandwich-o-Matic will make your lunch automatically
Scalar Network Analyser Jr
Scalar Network Analyser Jr
An Arduino-controlled automated whiskey distillery
An Arduino-controlled automated whiskey distillery
The Rex800 looks like a dinosaur Terminator
The Rex800 looks like a dinosaur Terminator
Home Environment Monitor
Home Environment Monitor
Understanding the Operation of the Frequency Synthesizer in Maxim’s RF Transceivers
Understanding the Operation of the Frequency Synthesizer in Maxim’s RF Transceivers
App note: EPIC: Electro-Pyrotechnic Initiator Chip Resistor
App note: EPIC: Electro-Pyrotechnic Initiator Chip Resistor
Noisy ESP8266
Noisy ESP8266
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

Top


Shares