Need help making a transmitter and a very small patch like receiver see below

[rustydog747]

I need help in developing a very small receiver that can transmit signals to a transmitter within a household. (up to 20 to 50 feet) This receiver must be no bigger in diameter than a pencil eraser head and flat as paper with a sticky side. I have an idea and need someone to help and become my partner 50%/50% partnership. Goal is to press the transmitter button and hear a beeping sound from the receiver. Would like 4 buttons on the transmitter with a direct link to 4 receivers using different signals. Other goal is to get onto the show Shark Tank or mass produce this product ourselves.

 

[E Kafeman]

I need help in developing a very small receiver that can transmit

A receiver or transmitter?
If receiver with a size around 0.1*5 mm (0.2*0.004 in), is that including battery, antenna and beeper? How long should battery last? A battery that can fit within this space, can not store much energy.
The beeper need to be rather big, if it not should require a lot of power. to be heard at a distance of 50 feet. A small beeper is often depending on a chamber/tube of some kind to be able to be effective.
When selecting frequency, for effective antenna should total unit length be lambda/2, leaving 50% of that space for the antenna. Antenna size can be reduced at cost of performance in some way but to keep power consumption extreme low in electronics is it important that other parts are as effective as possible (beeper, antenna).

For reference, a 800 MHz RFID price-tag have about 20x bigger area, mostly antenna area. 5 times as thick. Have a range of 1 foot or somewhat more if base unit is powerful enough (hardly battery operated). Price-tag must be placed on non metallic surface as antenna else not will work. Can not fit or power a beeper.

I have an idea and need someone to help

What part do you need help with?

 

[jiripolivka]

Your description of "a receiver that transmits to a transmitter" is confusing. Can you explain?

Next you state "upon pushing a button, the transmitter will activate a response of a receiver". How the above can work?

You can make miniature receivers but they need a battery to operate (for sound output you need 2 AA cells at least) and an antenna to receive a signal. Those two must exceed the size of an eraser.

You can try to use IR receiver but again the battery must be large enough to supply the audio output.

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You may know the "key finder" responding to your whistle. Those are good and cheap and if you whistle with force, you can achieve 50m range )