Why paying for an embedded GSM antenna if you can get the antenna for free?
The antenna at the picture or a lot of other embedded GSM antennas you will get free of charge. There is no reason to pay for. You just have to spend an area of estimated 800 to 1000 mmÂ² on your PCB. You do not like the published antenna shape and you are looking for an other type of embedded GSM UMTS antenna? Then do not hesitate to ask for your customised version.
In the magic world of embedded GSM antennas everything is cycling around the wavelength named Lambda or better said the quarter of the wavelength = Lambda/4 .
The red coloured part of the picture view is the part of antenna that will radiate at the lower band GSM 850/ 900MHz. A+B+C+D = 79 mm.
The green coloured part of the draft is the area that will radiate at the higher bands like GSM 1800/1900. I+F = 41 mm. The yellow part of the picture is showing the feeding line and the three rectangle black blocks are maybe capacitors or coils for the matching circuit.
The blue, red, green and yellow coloured aeras are cupper on FR4 PCB.
The gap between the branches of the antennas to the blue area is related to the bandwidth of the embedded GSM antenna. The blue part is called ground plane and has to have a size of 3500 mm2 to 4000 mm2. If it is less, then the efficiency of the antenna will be less as well. All lambda/4 GSM antennas has to follow this rules. Test it yourself and compare the size of your phone with the size of the mobile phone of your friend or an 5 years old phone.
Do you have further questions and would like to start the development of your own wireless M2M device right now? We will be glad to share our more than 15 years in GSM and GPS plus 25 years in radio communication with you. Just send an e-mail by using the form here or by e-mail to harald.naumann (at) gsm-modem.de .