Tag Archives: antenna

External antenna modifications for the Raspberry Pi 3

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In this post dorkbotpdx.org show us a couple of different ways that an external antenna can be added to the Raspberry Pi 3.

It’s not clear why an external antenna is not an option for the Pi 3, there are a number of possible reasons and I don’t presume to know the Raspberry Pi Foundation’s exact rationale. It could be to improve the out-of-box experience, an integrated antenna “just works” and there’s no potential for the antenna connector to be broken plugging in an antenna. It could be to reduce complexity, the unit with an integrated antenna is compact and self-contained.

External antenna modifications for the Raspberry Pi 3 – [Link]

4×1 WiFi Wireless Antenna Switch

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Horacio Bouzas published a 4 way WiFi antenna switch:

I started playing with electronics back when I was 10 years old in Argentina, where I grew up. Then I got my ham radio operator license when I was 16 years old and I was very active in the ham club and on the air. It was then when I built my first vacuum tube transmitter and refurbished and old receiver (also vacuum tubes) that somebody from the club was throwing away. My interest for science and electronics grew and I ended studying physics but always tinkered with electronics, whenever I could.

I’ve moved a lot around the world for work (oil and gas) so my dedication to ham radio pretty much faded away. But it came back! Just recently, I got my ham radio operator license back and started to get active on 2mtr and on digital.

Due to lack of space outdoors, I had to settle for installing my center fed dipole on the attic (I have a long attic), but I quickly realized I needed more than 1 antenna. 80 mtr, 40 mtr, 20mtr….

And I didn’t want to run multiple lines to the attic, so an antenna switch was necessary.

4×1 WiFi Wireless Antenna Switch – [Link]

Stanford engineer aims to connect the world with ant-sized radios

Stanford engineer aims to connect the world with ant-sized radios.

A Stanford engineering team has built a radio the size of an ant, a device so energy efficient that it gathers all the power it needs from the same electromagnetic waves that carry signals to its receiving antenna – no batteries required.

Designed to compute, execute and relay commands, this tiny wireless chip costs pennies to fabricate – making it cheap enough to become the missing link between the Internet as we know it and the linked-together smart gadgets envisioned in the “Internet of Things.

2J620P antenna – GSM and GPS under one roof

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New antenna 2J620P will provide you a high quality GSM and GPS signal at once, moreover with a very simple assembly.

Tracking of vehicles or goods is still more used what naturally results into a requirement for a suitable antenna. One of them can be the 2J620P. It offers a very simple and elegant solution, as in fact it is “2 in 1

SatNav Antenna Fixes your Position to 1 cm

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A new multi-band satellite antenna developed by Imec in collaboration with Septentrio was announced at the Mobile World Conference held recently in Barcelona, Spain. The antenna is a multi-band design capable of simultaneously receiving GPS, GLONASS, BeiDou and GALILEO satellite signals. The resulting receiver is capable of resolving its location to within 1 cm.

The antenna is paired with Septentrio’s credit card-sized AsteRx-m receiver, a dual frequency GNSS (Global Navigation Satellite Systems) receiver that provides centimetre accuracy while drawing less than 500 mW

SatNav Antenna Fixes your Position to 1 cm – [Link]

Simple Lightning Detector

Application:

Lightning detector that flashes when lightning strikes nearby.

Description:

This circuit picks up and amplifies signals in the 300 kHz range, where lightning makes a lot of noise that can be picked up with a radio.  The antenna and receiver are tuned to 300 kHz, with the receiver’s output connected to an amplifier that drives the lamp flashing circuit, alerting you to lightning in the area.

Use the potentiometer to reduce the sensitivity to noise and still be able to detect lightning strikes.  In addition to lightning, this circuit will also respond to noise from motors inside appliances like refrigerators, washers, and air-conditioners.  Another easy way to affect the sensitivity is to take off the antenna, or lengthen it depending on the conditions.  To get some confirmation while tuning the detector, you can tune an AM radio to the bottom the of the dial as well.

You can use this circuit to track weather, and be prepared for it. The circuit is small enough and can be placed in a project box or waterproof container to use, on a boat for instance.  The lamp can be replaced or even used alongside a buzzer in this circuit to give an audible alert as well, so that constant monitoring of the circuit is not necessary.

Simple Lightning Detector – [Link]

High-quality GSM/3G signal directly to your device

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Multi-band antenna 2J301 offers several properties for which it´s worth to consider its usage in your devices.  

Decent gain, good VSWR values, small dimensions, resistance to outdoor conditions and a simple mount method are probably basic features, which we´d expect from external antennas for the GSM/UMTS, PCS bands. Antenna 2J301M/SMA  from company 2J provides all this but it features yet another positive feature – a good price.

That´s why, if you´re searching for an antenna with good specification for a good price, 2J301M is a good choice. An elegant design from an ABS plastic is suitable for virtually every application and an easy installation is ensured by a magnetic bottom plate together with a 2.5 m long flexible cable (RG174) with the SMA connector.

Detailed description of the 2J301M/SMA antenna can be found in the 2J301 datasheet.  In case of interest, please contact us at info@soselectronic.com.

High-quality GSM/3G signal directly to your device – [Link]

“Antenna on Chip” Manipulates Light at Warp Speed

Researchers at Rice University (USA) have developed a micron-scale spatial light modulator (SLM) similar to those currently used in sensing and imaging devices, but with the potential to run several orders of magnitude faster. Their ‘antenna on a chip’ operates in 3D ‘free space’ instead of the two-dimensional space of conventional semiconductor devices.

A device that looks like a tiny washboard may clean the clocks of current commercial products used to manipulate infrared light.

New research by the Rice University lab of Qianfan Xu has produced a micron-scale spatial light modulator (SLM) like those used in sensing and imaging devices, but with the potential to run orders of magnitude faster. Unlike other devices in two-dimensional semiconducting chips, the Rice chips work in three-dimensional “free space.”

In current optical computing devices, light is confined to two-dimensional circuitry and travels in waveguides from point to point. According to the researchers, 2D systems ignore the massive multiplexing capability of optical systems arising from the fact that multiple light beams can propagate in the same space without affecting each other. [via]

“Antenna on Chip” Manipulates Light at Warp Speed – [Link]