Home appliance, smart home and AAL General about home applience Any home appliance has a power supply. That means power is no problem to support a wireless hub inside the device. Each AC power plug can run as wireless to power line communication gateway. In the basement I run a washing machine. In the kitchen […]
Category: M2M FAQ, hints, tips
How a wrong PCB track GSM antenna could look like?
Q: I read your super-interesting page on 0 € GSM antenna and I tried to sketch down a similar one for the M2M device I’m designing. My PCB is 42×65 mm, so when lying down tracks (79 mm for 900 MHz, 41mm for 1.8GHz) one area surrounds the other. Perhaps this is not a problem, […]
How to save or to bypass the American PTCRB approval?
The PTRCB approval includes TRP and TIS TRP and TIS are related to the size of the ground plane and small emergency devices like a GSM watch can´t offer a reasonable ground plane. Does it mean that a small emergency device to protect children or a dog collar to track your dog can´t be launched […]
How an extrem compromise will look like? GSM module in a watch
Customisted antenna design example for GSM watch Meandered monopole antenna Type: Inverted F antenna on chip Dualband GSM 900 / 1800 Tuning by extrem customisation Size of antenna: Round shape with a diameter of estimated 30 mm Size of whole PCB: 25 mm diameter This GSM watch was planned for mass production. Unique features of […]
Antenna ground plane – How small is small?
Reducing the antenna ground plane – Questions and ansers The reducing of the antenna ground plane or a minium antenna ground plane is a very common question to me all the time Q: How small is small? A: What is normal size? The lowest frequency in GSM 850 is 824 MHz. Embedded antennas for GSM […]
Bluetooth Low Energy Beacon – Indoor locating
Q&A about Bluetooth Low Energy Beacon – Indoor locating Q: Would this approach also work for Bluetooth 2.0 or older devices? A: It will not work, because classic Bluetooth 2.0 / 2.1 is sharing much more power. Bluetooth Low Energy is an always off technology. Bluetooth Low Energy is sleeping, transmitting a small package and […]
What Do The iPhone 4S And The Lord Of The Rings Have In Common?
The iPhone 4S came first, followed by the iPAD3 and the Motorola Razr now, Aldi is selling a laptop for Euro 499 equipped with Bluetooth Low Energy, also known as BT 4.0 or Bluetooth Smart. It was previously called Bluetooth Ultra Low Power, and in early 2001 as WiBree. “Wi” for wireless, and “Bree” for […]
Which embedded antenna to select for a Bluetooth / GNSS application?
Bluetooth, WIFI, ZigBee, ANT, and Wireless Hart – all mentioned radio protocols are using the 2400 MHz band Even the GNSS band (GPS, Glonass, Galileo, Beidou, QZSS) have to follow the same specifications, because 1575 MHz to 1610 MHz is not far away from the 2400 MHz band. Chip antennas and PCB antennas can be […]
Why the embedded chip or patch antennas are resonant on the wrong – to high – frequency? EA#
Your enclosure will interfere with your embedded antenna Just have a closer look on some 2400 MHz chip antennas or GPS patch antennas. Some manufacturers offers the embedded antennas with different resonant frequencies. The resonant frequencies are a little bit higher than the frequency you plan to receive. Why the antennas are resonant on the […]
Indoor locating – positioning by Bluetooth Low Energy
Indoor locating of a smart phone by Bluetooth Low Energy (e.g. iPhone or Android phone) Locating of smart phones like an iPhone or Android phone can be done with an app on the device. The app will download the floor plan of the building. Google maps already offers a floor plan generator. Nevertheless such an […]