Questions tagged [antenna]

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

Filter by
Sorted by
Tagged with
-1 votes
0 answers
35 views

How do I connect antenna to circuit [closed]

I am attempting to connect an antenna via an N-type coax to a circuit. I have an N-type coax connector to which I soldered two wires, but I am not detecting any current across those wires. The antenna ...
user avatar
2 votes
2 answers
277 views

Where is the positive and negative on a telescopic antenna?

Where is the positive and negative on a telescopic antenna? The image below (from a previous stack exchange question) shows a dipole antenna's positive and negative. Can someone please post a similar ...
user avatar
0 votes
0 answers
17 views

Antenna port S11(dB) > 0

I'm simulating a microstrip patch antenna in microwave office at 35 GHz. When plotting the S11 in dB of the antenna port I get values greater than zero at frequencies below 28 GHz. How is this ...
user avatar
  • 1
-7 votes
0 answers
30 views

Using The Microphone in slot as antenna [closed]

I bought A system that has no place for antenna..FM reception is not all that.. Can I use the microphone in slot as a antenna. Was wondering if I use a 6.35 adapter and plug a antenna with a 3.5 jack ...
user avatar
-3 votes
0 answers
92 views

Using a microphone in place of an antenna [closed]

Can I use a microphone in place of an antenna? The piece I bought has no antenna and the FM reception is not there. Would use a 6.35 adapter and insert a 3.5 antenna in to the adapter. It is a nice ...
user avatar
0 votes
0 answers
35 views

What is the appropriate name for a parabolic antenna with a "center mounted feed"?

How would a parabolic antenna with a "center mounted feed" be called? Below are some images which illustrate the type of parabolic antenna I'm referring to. According to wikipedia these are ...
user avatar
  • 19
4 votes
3 answers
482 views

DVB reception: Why do I need to add a coaxial cable to my installation to improve SNR of the signal?

I have the following installation: Dipole antenna <------> Coaxial cable (3 m) <-----> DVB receiver If I connect my dipole antenna directly to the DVB receiver, removing the coaxial cable (...
user avatar
0 votes
1 answer
43 views

Can I solder a wire antenna to the exposed PCB antenna of a BBC Micro Bit to boost its bluetooth signal?

Can I solder a wire antenna to the exposed PCB antenna of a BBC Micro Bit to boost its Bluetooth signal for both transmitting and receiving data? Can I solder this type of 2.4G antenna to boost the ...
user avatar
1 vote
0 answers
72 views

Frequency Response of Antennas

Electromagnetics and antennas are not my main area of expertise. However, I have a specific question about antennas that I want to get right in order to make sure my signal processing is right. What ...
user avatar
  • 11
0 votes
2 answers
65 views

How to determine the radiation pattern of a receiver antenna

I am designing a receiver antenna for a wireless power transfer application. The transmitter is a 2m x 2m horn antenna array that transmits a power signal at a frequency of 35 GHz from 100 meters away ...
user avatar
  • 1
0 votes
0 answers
42 views

How can I determine the Q value of a tuned square loop?

How can I determine the formula for Q value of a tuned square loop? How do I find the Q value practically?
user avatar
0 votes
2 answers
78 views

Does a receiving antenna radiate the power received?

Let's consider the case of linear dipole antenna or Hertz dipole. I know that the antenna acts as a transducer and it radiates the E-M waves due to the acceleration and decelaration of the electrons ...
user avatar
  • 3
0 votes
3 answers
101 views

Active Radar Homing with single antenna

From what I remember there are a few A2A and S2A missiles which have their own onboard radar system but I don't think they have multiple radar antennas for phased Array use. I'm curious how radar ...
user avatar
1 vote
1 answer
33 views

How to choose a sweep range for a known and unknown device with a VNA?

I'm trying to determine best practices for using a VNA to measure say, an antenna. Let's say I have a known antenna with a spec sheet that says it's frequency range is between x and y. Should I set ...
user avatar
  • 45
0 votes
0 answers
19 views

One or two transmit pins for NFC antenna and circuit differences

I looking to add an NFC reader to an upcoming project and have come across some differences in the antenna circuitry that I am looking to understand. I have noted that Texas Instrument's TRF79xxA line ...
user avatar
  • 326
1 vote
1 answer
51 views

end-fire antenna array: find the angles of the fire-end array for the minor Lobe maxima

I am solving (d) right now from the below problem, from Balanis Book: Antenna theory. I quickly show how to solve the (a), since it will be needed to solve (d). Directivity (\$D_{o}\$) is: \$ 10*log_{...
user avatar
0 votes
1 answer
51 views

Diode SPICE data accuracy at high frequencies?

I'm trying to do a non-linear harmonic balance simulation on a schottky diode model MACOM MA4E1317 that according to the manufacturer is usable up to 80 GHz. I got the SPICE data and S-Parameter files ...
user avatar
  • 1
0 votes
1 answer
71 views

Impedance match a NFC Antenna to 50 \$\Omega\$

I have a hard time understanding how I can impedance match a homemade nfc-antenna to 50ohm. My antenna is designed by calculating the inductance based on the dimensions, windings and so on. R_ant is ...
user avatar
0 votes
0 answers
51 views

Multiple antenna single rfid

I am using 134.2 kHz RFID reader module. My module has VCC pin (5V-12V), GND , TX(don't have RX pin, Module has one way communication) and reset pin. I need to use at least 4 RFID reader for my ...
user avatar
0 votes
1 answer
54 views

Antenna feed trace keep it short or long?

I am designing a GPS module but am quite new to RF design. I have seen a number of people say to keep your antenna feed line as short as possible. But in the design guide of the GPS module I am using, ...
user avatar
1 vote
0 answers
29 views

Antenna mutual coupling and estimation of angle of arrival

If I have two RX (receive) antennas at a distance of lambda/2 from each other there is a formula which relates the phase difference to the angle of arrival. The formula is however assuming no mutual ...
user avatar
  • 341
0 votes
0 answers
44 views

Isolating RF Ground is it wise?

I am designing a GPS module and I am planning to isolate the RF GND from the DC power supply GND with an inductor. I have chosen the Murata LQW18CN4N9D0ZD because the low inductance will have low Ldi/...
user avatar
0 votes
2 answers
98 views

Does an antenna have to be impedance matched to its transmitter circuit or the transmission line from it?

I am still very new to RF and I am trying to understand Impedance matching, so my question could be stupid. I have already learned the basics of it, I know how to use Smith charts, which components to ...
user avatar
0 votes
1 answer
50 views

Interaction between half wave dipole and power supply lines in 433 MHz RF module

For a second iteration of the 433 MHz transmission between Espressif ESP8266 modules, I switched to RF modules based on the SYN115 and SYN480R devices. Largely because these work much better with the ...
user avatar
  • 117
1 vote
1 answer
49 views

Chip antenna ANT161575ST-1202A1 layout question

I am designing a GPS module using the following chip antenna: https://product.tdk.com/en/system/files?file=dam/doc/product/rf/rf/antenna/catalog/rf_ant_ant161575st-1202a1_summary_en.pdf The datasheet ...
user avatar
0 votes
0 answers
44 views

How to simplify matching network LC circuit

I'm relatively new to RF design, and trying to implement a Micrel reference PCB antenna design (Heli-2). I am using a MICRF113 RF transmitter at 315MHz to transmit digital data using ASK (OOK). Here ...
user avatar
  • 13
1 vote
1 answer
39 views

What is k variable on antenna theory

I make my text on bold so it distinguishes from the print-screens I post. I am reading Antenna theory Analysis and Design, Balanis (Wiley 2016). At page 17, (subsection 1.4 CURRENT DISTRIBUTION ON A ...
user avatar
-1 votes
1 answer
79 views

Radiated signal from loft antenna?

I have the following home setup in the UK: The antenna is used for receiving free-to-air TV transmissions. I just want to know if it's possible for the signal from the HDMI to DVB-T box to radiate ...
user avatar
  • 1
0 votes
0 answers
31 views

Field cancellation of small antennas nearby

For example, two loop antennas in the same plane, but current in them is in anti phase. So that when viewed from afar field cancels out. How can I calculate effect of this cancellation? I expect it to ...
user avatar
1 vote
3 answers
125 views

Why is my best placement of a directional antenna so weird?

I moved to an offgrid house with a 3G/4G repeater, with a short, enclosed directional antenna. It was wobbling and poorly mounted on an unstable wood plank at the base of a window, so I decided to ...
user avatar
2 votes
0 answers
30 views

SX1262 Matching impedance

I want to build a LoRa node from SX1261 which works on the frequencies of 868Mhz and I found at the manufacturer the following assembly ms I did not find more details on the different passive ...
user avatar
0 votes
0 answers
25 views

What is the frequency measurement range of a NanoVNA?

I have tried to measure a fabricated patch antenna which has theoretically multiband ranging from 1 GHz to 8 GHz, but when I tried to measure it through NanoVNA it barely shows the result from 1 GHz ...
user avatar
0 votes
2 answers
51 views

Why does an isotropic antenna becomes anisotropic inside a phased array (mutual coupling neglected)?

in this paper the following statement is written: An area A is allotted to each element in the infinite array. This is the maximum area available to each element, and is usually greater than the ...
user avatar
  • 3,246
0 votes
0 answers
20 views

Comparing ST5 genetically designed antenna with a generic one - how do they fare?

I have been reading this paper. It describes an antenna generated by a genetic algorithm. I will not go in the detail of that. In any case, they say : ..., our evolved antennas demonstrate several ...
user avatar
  • 101
0 votes
0 answers
26 views

RF antenna matching circuit design for 53.4-219.2J load

I recently posted this question about designing a matching circuit for a Holtek BC66F2245, where I transmit data on 433.9MHz using a 50 ohm antenna. I have contacted the developers of the MCU and I ...
user avatar
1 vote
1 answer
41 views

How to place multiple antennas within a relatively small area

I am working on a project where I need to place some external antennas in an plane of around 220mm to 400mm in size. The wireless technologies in use are WiFi 2.4/5Ghz, Bluetooth, 4G LTE, 5G NR, ...
user avatar
0 votes
1 answer
33 views

Troubleshooting WiFi connection of my custom PCB - adding antenna to an ESP32 WROVER

My custom PCB sports an ESP32-WROVER-E. I have noticed that it suffers from weak WiFi connection to the contrary of the WROVER and WROOM dev kits I have (see below for the test I wrote). I suspect ...
user avatar
0 votes
0 answers
32 views

Do I need to change the values for capacitors and inductors in antenna circuit if changing the type of the antenna?

I am designing my first Zigbee board based on samples on the TI website for cc2530. In their sample they are aiming for long range antennas and I am only interested into short range so decided to go ...
user avatar
  • 117
0 votes
1 answer
62 views

How to design RF Matching circuit for Transmitter MCU (BC66F2245)?

I am designing a PCB where i use the Holtek BC66F2245 Transmitter MCU to send data using RF at 433MHz. I'm currently drawing the schematic in Altium and now i've come to the point of designing the ...
user avatar
-4 votes
1 answer
61 views

Does increasing voltage or current increase intensity of em wave produced by antenna? [closed]

Will Increasing voltage or current affect frequency or wavelength of em wave?
user avatar
0 votes
1 answer
130 views

What is the name of this antenna?

I compared RSSI of several antennas including this one I found laying around: It performed from all angles about 10 dB better than for example the quarter wave ANT-433-CW-HD-SMA (Mouser Link). Tests ...
user avatar
0 votes
1 answer
60 views

Inductor polarity

By looking on the picture of the inductor PE-0402CL470JTT and the datasheet, we can notice a black pole and a white pole for the inductor. Is there any difference between poles? The datasheet doesn't ...
user avatar
0 votes
1 answer
63 views

How Sleeve Balun works?

How does sleeve balun (Balance to Unbalance) works? In the setup below, the ground and signal of the coaxial cable is connected directly to the antenna which is wrong since coaxial is unbalanced while ...
user avatar
  • 942
2 votes
0 answers
51 views

Blocking BLE Chip Antenna from picking up signals in one direction

I am designing a BLE scanner/observer which uses a ceramic antenna. I was wondering if there is any way to design the PCB such that the antenna chip only picks up signals from in front of it instead ...
user avatar
  • 21
0 votes
1 answer
41 views

Extend range of BLE devices

I would like to extend the range of two BLE devices. The first one is a VR BLE controller with a monopole pcb antenna. The second one is an ESP32 Tinypico with a chip antenna. I bought two pcb ...
user avatar
0 votes
0 answers
24 views

Nanoantenna/Rectenna Questions

How are loads connected? Let's say I have an dipole antenna connected to one side of a resistive load (ignore values). simulate this circuit – Schematic created using CircuitLab Where is the ...
user avatar
  • 15
2 votes
1 answer
50 views

How to improve measurement results with pocketVNA

I use a pocketVNA to measure the impedance of antennas and I also bought a couple of SMA connectors and a few cables to connect the antennas to the device. I run a 2-point calibration of the device (...
user avatar
  • 378
0 votes
0 answers
49 views

How to choose a wrap (station) antenna for space application?

I am looking for my research project a wrap (station) antenna. It is assumed that the antenna works in space (lunar) environment. The total dose for my device is 30 – 50 krad. Gain 3-5 dBi. Frequency ...
user avatar
1 vote
1 answer
61 views

How to calculate far field distance from an antenna

I understand the formula for calculating the far field distance from an antenna is: Distance = (2D^2)/λ Is the D in the above equation the length of the antenna under test (antenna under test is a ...
user avatar
  • 340
4 votes
3 answers
690 views

Can a pulsating signal in which the direction of the current may not reverse radiate from an antenna?

Normally an antenna uses a sinusoidal wave whose positive half-period corresponds with positive direction of the current and vice versa. A pulsating signal/current is a signal in which the direction ...
user avatar

1
2 3 4 5
34