Antenna (radio), also known as an aerial, a transducer designed to transmit or receive electromagnetic (e.g. TV or radio) waves. -Wikipedia

learn more… | top users | synonyms

0
votes
1answer
24 views

Bluetooth Modules in a plastic enclosure

I would like to implement a bluetooth functionality in my project, preferably using STMicroelectronics SPBT2632C1A.AT2, with a protective enclosure. But I read from multiple sources that bluetooth ...
0
votes
1answer
35 views

Vivaldi Antenna: size & max input power & software simulation

First, I've to say I'm a beginner in this field so please forgive me if my questions were not smart. I was reading about Vivaldi antenna and I decided to do an experiment; I'm going to use a flat ...
1
vote
2answers
32 views

Antenna mounting question

Here is the datasheet and drawing of the antenna on this link I need to stick out the antenna from a thick metal enclosure, how much of the antenna should stick out? Is it 19 mm (the black rubber ...
0
votes
0answers
22 views

modeling AC resistance proximity and skin effect using LTSPICE

I'm designing an air-core loop receiving antenna from <1Hz - 50kHz. Is there a way to approximately model the skin/proximity effect using lumped circuit parameters in SPICE software? I think you ...
0
votes
1answer
21 views

Current and voltage distribution on a beverage and on a rhombic antenna?

Afternoon. I've been learning about antennas a lot lately, and right now i'm reading about both of these, been trying to find a read about their voltage and current distribution but so far i haven't ...
2
votes
2answers
97 views

How can I best fake an (AM radio) antenna signal?

I have an old (~late 1920s) AM radio that I'm currently working on. As I don't want to modify any of the internals significantly, it would be nice to have a way to fake antenna input. It's not ...
0
votes
1answer
49 views

Are all antennas traveling wave antennas?

I've been reading a lot about traveling and standing waves, and I am right now reading about traveling wave antennas, to my understanding ALL antennas should be traveling wave antennas, but this is ...
0
votes
0answers
19 views

RF Propagation of a beacon placed in a narrow hallway

If the walls are sufficiently thick concrete which have very high attenuation, and if the red circle is a beacon/ibeacon with an omni antenna, what is the expected propagation pattern? I want to ...
1
vote
2answers
35 views

Will an impedance matching network also act as a filter?

Will a matching impedance network also act as a filter? I'm using a pi network and am wondering if I should also add a filter. I designed the pi network by using the program SimSmith and it consists ...
0
votes
0answers
38 views

Transmitting data over Long range ,using a Low Power Circuit

I Have Been Designing a BOT That Would Travel Along the Pipeline And Detect Leakage Using Ultrasound Efficiently,And Locate The Position of Leakage Using A GPS MODULE using the Arduino,I have make it ...
0
votes
1answer
50 views

wifi / WIMAX antenna

What the different between WiFi antenna and WIMAX 4G antenna?, I want to boost the signal for my router to 4 km, I found this antenna in local store, but it seems weird there is only 1 leg, not like ...
1
vote
2answers
67 views

Oscilloscope Output with its positive terminal touching human's body and negative terminal left open

it once happened that when I touched the positive terminal of the Oscilloscope input probes letting its negative terminal open, I observed sinusoidal voltage signals with 0.5V peak to peak and of ...
2
votes
1answer
40 views

Will a CC1120 IC be burnt during transmission if antenna is removed

I am using a TI CC1120 evaluation kit which is working in the 800MHz band amplified by a C1190 to a 27dBm output power. I would like to know if it would damage the board to be used with no antenna ...
0
votes
0answers
41 views

Radio direction finding methods

I am a little bit confused about the different Radio Direction Finding methods and I want to chose the simplest method for what I want to do: find azimuth and elevation angle of arrival of my ...
2
votes
0answers
36 views

Weather Balloon Wireless Mesh Networking

I am trying to get real-time data feed from a homemade weather balloon radiosonde with the objective of sending HD video during the flight; this could be relevant for GoPro-ers who want to send their ...
0
votes
1answer
37 views

Using CP antenna for receiving and LP for transmitting

I've set up two antennas with Linear Polarization (LP) in both sides, in 2.4 GHz no more than 4 meters each other, but they are facing strongly obstruction object (like a big steel wall in they line ...
0
votes
1answer
30 views

Detect incidence angle with an antenna array

Having an antenna array, how can we determine incidence angle of an incoming signal. I know it is related to the phase of the signal in each antenna but I only found information about how to send a ...
1
vote
0answers
35 views

Which antenna combination is the best?

I understand that the polarizing affects of helical and clover/mushroom antennas can help to extend the range of a transmitter receiver pair. I'm not sure though, if I can mix the two so that I would ...
2
votes
3answers
56 views

How to adjust receive-only antenna?

I don't understand most of the antenna balancing instructions I read; for one thing they virtually all seem to assume the antenna is being used to transmit. In my case I am only interested in ...
0
votes
1answer
69 views

2.4GHz Bluetooth PCB Trace Antenna Range

I have designed a PCB trace antenna for a BLE module. I used an existing reference design, which is offered to be used in your own design. I am able to connect to the radio, and on a spectrum analyzer ...
0
votes
3answers
56 views

Efficiency of Antennas vs operating frequency

I have refereed a document from TI which mentions that antenna efficiency decreases as frequency is further decreased. Although 136 - 240 MHz has highest range for equal power, the efficiency of ...
1
vote
0answers
20 views

HF RFID 13.56MHz Interference from WiFi/BLE 2.45GHz?

If a Wifi/BLE antenna were placed within a multicoil loop antenna for 13.56MHz HF RFID, would there be significant crosstalk/interference?
3
votes
3answers
342 views

Radio wave interference

While studying radio electronics I stumbled across a small article about wave interference on the same frequency. The article was very simple explaining that if there a stronger emitter on the ...
1
vote
1answer
40 views

multiband antenna for RF

I'd like to make a small chip using either the Texas Instruments CC1101 or the Nordic nrf9e5 that provides a range of different frequencies. This is mostly meant to be a tool for playing around at my ...
4
votes
6answers
293 views

Reradiating antena for GPS

I need to test and maintain a batch of devices which contain GPS modules. I can work on the rest of the device, but when it comes to test the GPS part I have no signal on my desk, no matter how near I ...
0
votes
1answer
71 views

Should I use a passive or an active filter?

simulate this circuit – Schematic created using CircuitLab I need to design an am receiver as a project. On the front end I have three modules; BPF1 the "roofing filter" or the ...
2
votes
1answer
52 views

Wires acting as input and Output

I always wondered how ear phone wires acted as antenna giving input to the connected device and also acted as the output driving speakers... Does the the frequency of these has to do something with ...
3
votes
2answers
152 views

What RF attentuator would be used for the HackRF?

Background info: The HackRF is an SDR Radio capable of receiving and transmitting frequencies from 10MHz to 6GHz. Michael Mossmann, the creator of the HackRF, states in his wiki that: The ...
2
votes
1answer
49 views

impedance matching single vs series capacitor

Im looking at a impedance matching circuit on a schematic that shows a .75pF capacitor pulled to ground. With my current board design I have a 1pF and a 3.3pF on the board already so I am thinking ...
0
votes
2answers
100 views

What technique can I use to focus a Bluetooth 4 transmission (or at least shield it)?

I'm actually trying to focus an iBeacon that uses Bluetooth 4.0 LE. These transmit in the ISM band from 2.4 to 2.485 GHz. Normally these things radiate in a spherical, or half spherical pattern, but ...
0
votes
0answers
59 views

how to connect an 50 ohm antenna to 600 ohm amplifier?

May i connect an 50 ohm antenna to an 600 ohm amplifier using a: sma connector ; double shielded coaxial cable; twin flex
2
votes
4answers
110 views

In a gps receiver, how is the delay of the signal in the antenna lead allowed for?

In a gps receiver there is an inevitable time delay in the signal travelling in the antenna lead to the circuitry of the receiver. In a typical 5 metre lead the delay is about 15 nanoseconds, which, ...
1
vote
1answer
145 views

How big a ground plane does a gps antenna need?

How big a ground plane does a gps antenna need? I am using a GPS puck antenna that has a magnetic base to hold it on to, typically, the roof of a car. I would like to use it from my room at home, on ...
-1
votes
2answers
69 views

Does a regular signal booster with antenna work for cell phone?

I am not that much familiar with communication and antennas. I want to build a gsm repeater (gsm signal booster), but I am not sure if it works if I do it like the way we do for a radio. What I am ...
4
votes
3answers
91 views

What is the voltage source and ground on an antenna?

I've seen a few diagrams relating to AM demodulation, and I can't for the life of me figure out where the voltage source and ground come from in an antenna. From what I understand, an antenna can ...
2
votes
2answers
68 views

Antenna VS Coil

So I sorta understand that antennas are just wires connected to a signal out with no reference to ground. (That's for a different question) How does a coil/inductor with one side attached to v+, one ...
-1
votes
1answer
99 views

RF - separate transmitter and receiver antennas for half duplex

i was wondering why is it for just half duplex systems, don't we have a dedicated transceiver and a dedicated transmitter antenna. ok, just hear me out... assuming we are using grounded monopoles, ...
-5
votes
3answers
110 views

Antenna Gain definition and uses [closed]

What it is Antenna gain? If the gain of the antenna is high, does that mean it has a big coverage area?
0
votes
0answers
25 views

What are the first 3 natural resonant frequencies of a bi-filar antenna? Any length.

I have a different type of question - in regards to 3D extruded antennas. What are the first 3 natural resonant frequencies of a bi-filar antenna? Any length.
1
vote
1answer
134 views

How to Calculate maximum distance between transmitter and receiver in wireless communication

how to calculate maximum distance between transmitter and receiver in free space radio communication by having transmitted power, antenna gain and noise-to-signal ratio ?
0
votes
1answer
114 views

ESP8266 serial-wifi: antenna options

The cheap ESP8266 boards are offered on ebay with two built-in antenna options: with a PCB trace antenna with a ceramic(?) antenna (PCB photographs see below.) Has somebody bought both and ...
0
votes
0answers
46 views

Voltage Across Patch Antenna and Power Output

I'm modeling a patch antenna using two copper plates (ground plane and patch), ceramic in between the copper plates, and a lead connecting the patch and ground plane that runs through the ceramic in ...
0
votes
2answers
42 views

Antenna efficiency and PCB impact

I'm trying to improve the range on my 433 MHz radios and came across http://www.att.com/edo/en_US/pdf/AntennaFundamentals.pdf. (Geez, there's so much RF information in many bits and pieces, if only ...
4
votes
3answers
290 views

Design of an electronic device to disable remote access ability of contactless payment cards without visible alterations and damage to the card

Question: How could I build an electronic device which disabled the remote interaction functionality of contactless payment cards while not affecting the functions which are accessed via the on-card ...
3
votes
1answer
80 views

motorcycles and vehicle ground loop detectors

I have been asked if it is feasible to make a motorcycle accessory that will trigger the traffic ground loop antenna sensors that typically fail to register the motorcycles presence. Reading up on ...
1
vote
0answers
57 views

Shared feed/GND pad on Pulse W3011 antenna

This is my first post; sorry if I've unwittingly broken any rules or accepted conventions around here... I'm using a Pulse Engineering W3011 ceramic GPS antenna. As is common with these small ceramic ...
1
vote
1answer
44 views

How to detect several agents within a radius, what is the best and easiest way to do it?

I have a room with 30 objects which may or not be present, and I want to be able to detect which objects are in the room. My first idea was to attach a RFID tag to each one of these objects and have ...
2
votes
1answer
37 views

Analyzing reflection and transmission without a VNA

The wikipedia page for network analyzers mentions "reflection and transmission of electrical networks are easy to measure at high frequencies" but doesn't give any hint on how this is done or what it ...
1
vote
1answer
36 views

Trying to understand directivity of an ultrasonic sensor

I am trying to understand this plot of directivity from the following link: http://www.nicera.co.jp/pro/ut/pdf/T4010B4(ENG).pdf How do I read this plot? I can say that at 0 degree , the energy ...
0
votes
0answers
90 views

How to De-embed 3-port Network on ADS

ADS 2013 no longer has odd-port de-embedding. I want to eliminate the effect of a 3-port balun board on the measurement of the antenna. How can I do that in ADS? I tried using a 4-port de-embedding ...