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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Using Pulse W3006 Dualband Wifi Antenna with a CPW-G Trace and Single RF_Out on MC

Pulse W3006 Chip Antenna Being Used We are designing a custom PCB which uses a micro-controller with a single RF-out capable of doing 2.4G/5G/Bluetooth. This questions has 3 parts: Using the Chip ...
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0answers
38 views

Finding Physical Location of WiFi Access Point [on hold]

I am looking for a method (if there is such) to find the physical location of a target AP based upon these factors: I have the physical location of a nearby router (reference AP, not target) I have ...
-4
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0answers
32 views

How to Design a three-element Yagi-Uda antenna for operation at 100 MHz? [closed]

I have Basic knowledge about Yagi-Uda Antenna. The main requirements for the design of 3 element Yagi antenna are the following: • Element gain • Front to back ratio • VSWR • Impedance But I don't ...
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2answers
28 views

quazi-isotropic broadband bowtie antenna design?

I am not an expert in radio-electronics, as you will see shortly (a biochemist by training), and I am reading on ways to focus electromagnetic waves (light, actually), across a spectrum of lambdas ...
33
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3answers
4k views

Can people act like antennas?

I was watching my oscilloscope as I was holding a very short wire attached to the probe. It was showing about 0 voltage (small spikes) until I touched the metal. When I touched the metal, the scope ...
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1answer
41 views

Yagi gain reduction when using off frequency (2.3Ghz WiMax system using 2.4Ghz WiFi Yagi)

I have a new WiMax 2.3Ghz broadband service that has marginal reception. As the frequency 2.3Ghz used is close to WiFi I am thinking I can use a cheap WiFi yagi instead of a much rarer (and expensive) ...
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1answer
46 views

What are the capacitor values and why there are holes in PCB? - Semtech's reference design - SX1272MB1DCS

Semtech is providing a reference design concerning the SX1272 chip: SX1272 modules: SX1272MB1DCS - 868 MHz - Combined RFI and RFO, switchless (Ref design only) I can't find the values of C12, C14, ...
2
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1answer
41 views

How to make an impedance matched circuit for fabbed antenna?

Okay I have developed an antenna for a system and need to create an impedance matching circuit. The theory of conjugate matching is simple, but actually implementing it is something I can't find ...
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1answer
72 views

Maximum range of 27 MHz ISM band NLOS radio broadcast

What is the maximum range of a 27 MHz ISM band when transmitting at full power? I am interested in general situation for US and EU but that will go back to the power limits allowed. My country (CZ in ...
3
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0answers
52 views

Design for planar antenna that radiates in the plane of the antenna

Im trying to find a reference planar antenna design. The goal would be to design an antenna that radiates omnidirectionally on the pcb plane. One solution would be to use an electrically small loop ...
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1answer
68 views

Mobile signal jammer [closed]

I am trying to make a mobile signal jammer for GSM 900 and GSM 1800 using this circuit . Actually I am having doubts regarding antenna . What type of Antenna can be used . I tried using copper and ...
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0answers
14 views

CP antenna module with UART

I am searching for a replacement of XBEE pro S1 XbeeModule with some module with CP antenna (2.4 GHZ IEEE 802.15.4) ? This module should have a UART interface so that can directly connected to my ...
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1answer
34 views

Antenna and balun for MRF49XA

I am trying to do a project that involves proximity detection. I need a few devices omnidirectionally detecting each other at short distance (under 20 feet). It seemed to me that sub-1Ghz RF is the ...
-1
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1answer
56 views

1dB beamwidth of half wave dipole antenna

Could anyone kindly help me out with this assignment question? "Derive the mathematical formula for the 1-dB beam-width of a center-fed half-wave dipole antenna."
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0answers
30 views

how to identify pads of a chip antenna?

I am using a chip antenna called ACA-102-T. The linked document says that Pad No1 is the input pad, and Pad No2 is the ground short pad and an example circuit I am going to solder the ...
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1answer
68 views

RF energy harvesting using UHF and HF from tv, radio and cell towers [duplicate]

I am busy with a project where I want to harvest energy from UHF and VHF such as tv broadcasts, radio and cell phone towers to charge a 100uf capacitor to be able to power a low power appliance such ...
0
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1answer
109 views

Why does an antenna sometimes has a bending on the end of the wire?

I sometimes see antennas as follows ( Paint ;) ): It sometimes is even in manufactured wires. This gives the clue that there is a scientific explanation for this bending. I have searched on the ...
3
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1answer
40 views

coupling in transmission line

I have a very basic and rather silly question which I have not found any suitable answer yet. Suppose I have 2 transmission lines. One carrying a high frequency sinusoidal signal. Is there coupling ...
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1answer
61 views

Understanding 75 ohm antenna connection on a hifi receiver

Dear electrical engineers! I am trying to understand what stands behind a 75 ohm (unbalanced) antenna connection on my hifi receiver? I understand the "unbalanced" part, however not the "75 ohm" one. ...
2
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1answer
33 views

Antenna gain and aperture

Consider two different antennas with equal gain. Let's say one of them is a vivaldi antenna and the other is a horn antenna I want to learn how much of the incident power these antenna will be ...
4
votes
3answers
320 views

How can I reproduce ambient EM fields inside a Faraday enclosure?

I am part of a research team looking at the possible effects of EM fields on psychological function. The experiment calls for participants to perform a series of tests while inside a Faraday tent that ...
0
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0answers
26 views

Compact alternative to discone for wideband VHF/UHF reception?

I have a discone antenna and it works great for wideband reception in a stationary configuration. The discone, however, is somewhat unwieldy and would not work well on a car. I am trying to find a ...
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2answers
47 views

antenna gain, calculating voltage scaling

I am working on a software defined radio project, but I am kind of new to antennas. There's so much info out there on antennas that I'm having trouble finding the answer to my specific question. ...
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2answers
65 views

How to avoid interferences (antenna effect) in long traces in PCB?

I am working on a PCB layout in which I have a 40cm long traces (bus of 4 traces). This traces will support between 50mA to 100mA and 5V. I want to minimize possible antenna effects that may occur due ...
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4answers
293 views

How can I tune an antenna for receiving (VHF)?

I have a number of books on antennas and without exception they all describe balancing antennas only for transmission. Since I do not even own any transmitters these guides are useless. I have only ...
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1answer
55 views

Link between RF433 emitter and antenna [closed]

I am looking for a way to link a RF433 emitter to a RF433 antenna Since there is an "ANT" pin on the emitter I assume I can connect an antenna to it. However, I do not know how to do this kind ...
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2answers
58 views

how much voltage pass through antenna? [closed]

I want to know how much maximum voltage can be generated on a receiving antenna. Also, please help me to find an antenna design with maximum received signal voltage; I dont have proper knowledge of ...
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1answer
38 views

Loop antenna's electric field

Loop antenna's are often solved for magnetic field and we perfectly know how they behave towards magnetic coupling as shown in this image : However, I am looking for the electric field lines ...
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2answers
90 views

Antenna for broadcast AM reception on ARM Radio SDR

I'm trying to build the ARM Radio project detailed here. I routed and fabricated a PCB for the anti-alias filter and preamplifier shown on page 2 of the linked PDF, and reproduced here: ...
0
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0answers
36 views

Intel Edison External WIFI/BT Antenna Certification

I want to bring my device with Edison using external WIFI antenna for FCC certification. The test lab asked me how to set continuous Tx and Rx, but I can't find any instruction from Edison developer ...
5
votes
1answer
83 views

Why longer antenna coaxial cable has better efficiency?

I am not an RF engineer and I don't understand why for the same PCB antenna but with longer cable length can have better return loss and efficiency. I am comparing W3538B0150 with W3538B0200. I ...
0
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1answer
46 views

Does length of wire to NFC antenna affect ability to read tags?

Most questions regarding NFC antennas pose the question if it's possible in increase the reading area of an antenna. I'm curious: given a fixed size antenna, does increasing the length of wire ...
0
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1answer
55 views

Antenna Coverage Area using H-plane E-plane diagrams

On many antenna product sheets the H-plane and E-plane angles are given. On some data sheets you can find the diagrams for aformentioned planes. Are these values the same as where manufacturers ...
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2answers
169 views

What are the units in which a radio signal's strength is measured?

I'm kind of confused about which is the most correct unit when it comes to the measure of wireless signal's strength. It seems that the correct unit is V/m (usually expessed in dBuV/m), however it ...
0
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1answer
88 views

Amplitude of antenna-voltages induced by microwaves [closed]

I’m rather new to electronics and I encourage you to prepare yourself both mentally and physically for some very stupid questions – and some assumptions of my own (possibly very wrong) – about ...
1
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1answer
51 views

Sharp corners in RFID antennas

I have heard anecdotally that a square HF RFID antenna performs worse than a circular one, but I am struggling to find any articles on why this is the case. I assume there is a charge concentration ...
2
votes
1answer
56 views

RF generator TX antenna with low impedance can damage generator?

I got an RF generator R&S HAMEG HM8135 that I use in a testsystem to generate FM and AM stimuli in order to check if FM antenna and AM antenna is correctly mounted on the testobject in a ...
4
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2answers
90 views

Does antenna feed line length affect impedance

I built my own antenna but when I measure the impedance (VNA) I see they are off. One is 30+25J, the other 15 + 10J. I built these by hand, the only difference I see is the feed line to one is about ...
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2answers
53 views

Minimum separation between antennas in receiving

It's known that there has to be a separation between antennas of same frequency to minimize interference. But this is really necessary when antennas are mostly in reception mode?
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2answers
70 views

What is load on an antenna? Is it safe to short the antenna port?

On the readme page of https://github.com/pwarren/rtl-entropy, it says: If you're serious about the cryptographic security of your entropy source, you should probably short, or put a 50 Ohm load ...
0
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1answer
41 views

matching network design for transceiver with differential outputs

I'm trying to learn about matching networks. I have a 2.4GHz radio chip with differntial TXP/TXN outputs, and RXP/RXN input. These both share the same single ended antenna. I've been reading and I ...
0
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1answer
77 views

WWVB Antenna Reciever 1st Amplifier stage, no signal

I made a high input impedance JFET CS amp as the 1st amplifier stage for a 60kHz Loopstick Antenna. I am using an RF JFET (J211) and ceramic capacitors. The only signal I see is a 60Hz sine wave ...
2
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1answer
43 views

How to calculate or should I measure impedance for 1/4 Wave monopole?

I have this odd design that I'm trying to improve the antenna on. It has a mother board and a radio board above it, and it's densely packed with components. My idea was to try a monopole in the ...
0
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1answer
56 views

WWVB simple receiver help

I am trying to experiment with WWVB receiver design... The antenna I am using is from another WWVB receiver module. It is a loop antenna with a capacitor that I assume is tuned to 60kHz. Questions- ...
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3answers
118 views

Are the same type of antennas used for receiving and transmitting?

Short version: Is the same antenna type used for transmitting as is used for receiving if the frequency is the same? Long version: My garage door opener uses 433 MHz to receive signals from the ...
0
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2answers
166 views

Increase range of 433MHz remote sensor [closed]

My question is similar to this one but with some differences. I have wireless weather station with 3 remote 433MHz sensors so I cannot change the protocol and program the controllers. Also I'm new to ...
1
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2answers
46 views

WWVB antenna interferance from AC/DC converter supply

I'm working on a design that uses a WWVB antenna receiver.... The WWVB antenna is a small (~ 1/4" x 4" rod). Size is not a constraint so I could make it much bigger if a I half to. The design is ...
3
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1answer
72 views

Using both ground pins on uFL connector

I would like to add an Hirose U.FL antenna connector to my PCB. I have no previous experience of using them, so I would like to now if I should connect both of the GND pins to the PCB ground or it's ...
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0answers
28 views

Reflector with Ferrite Antenna?

Would a parabolic reflector have the same effect using a ferrite antenna? I didn't see anything online, but I can think of reason why it would work. I rigged one up out if sheet metal and it seems to ...
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1answer
40 views

ferrite antenna impedence matching

I am using a WWVB receiver for a project I am working on. The ferrite antenna that the receiver came with has terrible gain and I want to make one that is several times larger. I know how to make a ...