Antenna design Definition and 33 Threads

I am covering parabolic antennas with a school student in elementary physics, and I was looking for the specs of the (offset) antenna on her family's roof in order to calculate things like focal distance. She sent me a photo (she is on another continent), I found the brand specs, which lists it...

I have written a solver for my thesis which determines various parameters of a conical horn antenna for astronomy application. It is done with Mode Matching Technique (MMT) and some Rumsey's integrals for the aperture free space transitions. I have made some goal functions with the solver which...

if an antenna 8.2 feet long was coiled up into a coil could it still receive radio signals at 30 megahertz?

My name is Chad and I am a senior level undergraduate Electrical Engineering major. I have an interest in physics as well and am doing undergraduate research currently on semiconductor materials that can convert beta particles into electrical energy. I am knowledgeable in the area of EM waves...

Suppose the performance of an antenna is calculated. How about its complimentary antenna?

What is the connection of relative permittivity and bandwidth of an antenna? Higher relative permittivity resulted in high wider bandwidth?

I want to use small molecular - preferably CNT - "antennas" to produce THz signals to monitor activity in biological systems. After some googling, I've been reading things like "absorption spectra", "energy bands", "spectroscopy", as well as a bunch of antenna-science related jargon... I need...

This is the AN/APG-81 AESA Radar antenna by Northrop Grumman currently found in the F-35 (photo from wikipedia article). It seems to have a very different structure than past AESA/PESA antennas. For example the APG-68 from the F-16 looks a lot like stacked, slotted wave guides to me. So...

Is it possible (and if so how practical) to overdamp a conductor wire that is many times longer than the wavelength of the incident radiation so that it doesn't reradiate any detectable amount, turning practically all incident radiation into heat?

Is it possible to design an unpowered antenna, (possibly some kind of RLC circuit) which will receive a radio wave at a particular frequency and then re-emit it at a lower frequency?

Is there a (dielectric) antenna of this shape ---o---o---o---o--- | | | | ---o---o---o---o--- i.e. a ladder? What is the good for such antennas?

I'm curious about anyone that has concrete hands on experience tinkering with very small low frequency antennas. My band of interest is 6, 13 or 27 MHz. I wonder if it is possible to design a very small physical antenna that will radiate with some directivity even if the efficiency is not so...

What i need are the ff: basic guidelines on how to create an outdoor antenna (you can send links :)) the most suitable type of antenna that can receive 70 MHz tv station frequency. The antenna will be mounted less that 3 m from the ground. computations that i need to know (you can also send...

Is there any particular reason to choose a square shape antenna like http://www.globalspec.com/reference/70592/203279/2-5-4-by-4-wavelength-rectangular-microstrip-antenna instead of a circular shape?

Hello Experts, I have created this thread especially for clearing some of the important concepts of Antenna and Designing Issues. I have a question for all of you, related to Dipole Antenna. I have designed a Folded Dipole Antenna resonating at center Frequency of 145.800MHz. This antenna is...

Is a small-loop antenna a dipole or a monopole? Is a (small) 8-shape antenna a dipole or a monopole? Is a 8-shape antenna a dipole antenna?

Over the literatures there are S-shape and 8-shape antennae been discussed. What are the differences? The 8-shape seems to be found in amature using magnetic loop. Why magnetic?

Is there an antenna of S shape or perhaps a butterfly shape? What is the benefit of such design?

WiKi indicate Millimetre Wave Antennas for Gigabit Wireless Communications: A Practical Guide to Design and Analysis in a System Context Huang, Kao‐Cheng ; Edwards, David J. Chichester, UK: John Wiley & Sons, Ltd But our library do not have this book. Has anyone know other book on this...

There are many webpage about dielectric antenna For instance, https://en.wikipedia.org/wiki/Dielectric_resonator_antenna But I cannot figure out where does the energy feed-in or take-out from the antenna?

Could an antenna made from a non-conductor or a poor conductor?

My question stems from the Cosmic-1 satellites using single antennas for radio occultation and the cosmic-2 sats that will use a phased array antenna. I've done a fair amount of research in regards to the phased array antenna. Overall it seems to improve the signal to noise ratio when making...

I use this for my backyard hobby (amateur) design work; don't know how valid it is but has always seemed to be accurate. does anyone know if similar downloads for designing other antenna types beside yagi's. just want to have some fun, no specific application.

Hey guys, I am trying to design an Inductive Square Antenna Coil that will be milled onto my PCB. I am slightly confused when it comes to the matching circuit. To my understanding the matching circuit is there to have the same impedance value of the antenna, correct? So my matching circuit...

Hey everyone, Looking for someone in the know regarding RFID reader antenna design. Part of a project I'm working on requires a custom RFID transmitter antenna. If possible, I'd like to design the antenna as an integral part of a steel cylinder. I know there are on-metal tags, but is it...

Hello. I was wondering if someone could explain to someone with no electrical engineering background where would one place the resonator whose sole responsibility is to amplify sine waves at a particular frequency while ignoring other sine waves. Would this resonator be located by the antenna...

Hi everyone, I'm Designing a BiQuad antenna for WiFi applications. The design and optimization are relatively simple but i need some references of the theory behind this antenna. I'm reading some theory of Bi-Conic Antennas but it's a bit difficult to extrapolate the idea between both...

Hi I have taken a very rudimentary course on antenna theory, now i am interested in further deepening my knowledge. I have bought myself Balanis's book on antenna theory, I need some guidance regarding what chapters should i study as it is quite a large book. Secondly, after i have got...

hi this is vebi , i want to design rfid tag antenna with moisture sensor can anybody suggest me how to design

I am looking for textbooks or reference material that will help my design a loop antenna to operate in the long wavelength spectrum(60Hz to 100KHz to be exact). I understand there is more to consider than just Faraday's law and am looking for a book that can help step me through the process of...

I made the mistake of buying a cheap Chinese phone on Ebay (don't buy phones from Shaosan Li) The reception was useless and in only worked in direct line of sight of a phone tower less than 50 m away. With nothing to lose I pulled the back off the phone and located the internal antenna...

I searched the forum and didn't find any input on this subject. Dear PF members, I need your help. I am at training for a university, and am assigned a project where I should design a quad-band (or tri) GSM antenna for a vehicle. I am going to second year EE undergrad. so I am only required...