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

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27 views

HDTV Antenna for Urban Use [on hold]

Trying to find/build a decent omnidirectional HDTV antenna for use in an urban area. So far, it seems like the cheaper and simpler, the better. Wondering is this is science or art.
3
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3answers
306 views

What makes this active antenna “active?”

I'm using a external taoglas GPS/Glonass active antenna. It has a male SMA connector and I don't see where any voltage source hooks up to thing. So how is it active? Or does the power required for the ...
1
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1answer
34 views

“Coplanar waveguide” vs open space?

I'm routing a U.FL connector to a cellular module (Telit GE864). According to this calculator a 1mm track with 0.16mm gaps should provide a 52Ω impedance path to an U.FL antenna connector. A ...
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1answer
35 views

Interfacing a GPRS chip (WISMO218) with an RF antenna. Calculating line width for the right impedance

I want to interface the WISMO218 GPRS chip with an antenna. The antenna lines on the PCB board have to be very specific, otherwise the system won't work. I have uploaded the part of the datasheet that ...
0
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0answers
33 views

Designnig a Simple Ultrasonic Phased array system

I want to design a Phased array Ultrasonic System, I want to detect pipeline leakage in the PVC pipes so I am going to keep the Array in contact with the pipe, I have retrieved the Tx and Rx from the ...
0
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0answers
25 views

How would I mount WiFi antennas inside this small PC? [migrated]

I am making a small PC and internal antennas would be preferable. I see devices like Intel NUC and Gigabyte BRIX miniature PCs which have effective internal antennas. Basically, what type of antenna ...
0
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2answers
36 views

433mhz micro directional antenna design

I'm trying to build a Radio wave penetration device that register the RSSI on the RX module. There are two 433 transceivers one is the RX and the other TX - I want to place between them different ...
1
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2answers
142 views

Explanation for: A monopole antenna must contain a resistor (or equivalent) and therefore must have 2 terminals?

Could someone explain why this sentence makes sense: A monopole antenna transfers energy from electrical domain to the electromagnetic domain, hence must contain (equivalently) a resistor, hence ...
0
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1answer
35 views

SPICE how to assign a variable voltage generator for receiving antenna

I would like to do an AC analysis, noise analysis and signal to noise simulations using TINA TI - LT spice is OK How do I assign a variable voltage with parameters to an AC voltage source in SPICE? ...
0
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1answer
38 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
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1answer
45 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 ...
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2answers
41 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
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0answers
28 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
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1answer
23 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
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2answers
105 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
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1answer
50 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
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0answers
20 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 ...
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2answers
40 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
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0answers
40 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 ...
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1answer
58 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 ...
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2answers
71 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
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1answer
41 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 ...
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0answers
45 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
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0answers
47 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
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1answer
42 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
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1answer
35 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 ...
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0answers
37 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
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3answers
57 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 ...
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1answer
102 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
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3answers
63 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 ...
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0answers
28 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
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3answers
344 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 ...
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1answer
41 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
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6answers
312 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
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1answer
76 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
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1answer
53 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
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2answers
205 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
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1answer
54 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
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2answers
121 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 ...
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0answers
79 views

How to connect a 50 ohm antenna to a 600 ohm amplifier?

May I connect a 50\$\Omega\$ antenna to a 600\$\Omega\$ amplifier using a: SMA connector; double shielded coaxial cable; twin flex.
2
votes
4answers
124 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, ...
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1answer
219 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 ...
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votes
2answers
76 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
93 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
72 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 ...
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1answer
113 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, ...
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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
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0answers
26 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.
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1answer
154 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 ?
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1answer
156 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 ...