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Antenna Circuits / Schematics

100MHz ground plane antenna - Here you can find plans for a simple ground plane antenna that works well in the FM Band (88-108MHz). It's built of a small plastic disk…

6 x 6 Loop Antenna - This new loop antenna by Graham Maynard is his best design yet and I am proud to be the first to present his work. It uses one, six foot square, six turn loop, and is aperiodic in nature, covering the frequency range 50KHz - 5000KHz...

Active Antenna - An antenna with an integrated RF pre - amplifier

Active Antenna AA-7 HF/VHF/UHF, 3-3000MHz - If you have a shortwave or high-frequency receiver or scanner that is struggling to capture signals with a short, whip antenna, and you'd like the kind of performance that a 60-foot 'longwire' antenna can provide but lack the space to put one up, consider building the AA-7 HF/VHF/UHF Active Antenna described in this article.…

Active Antenna for AM-FM-SW - This simple little circuit can be used for AM, FM, and Shortwave(SW). On the shortwave band this active antenna is comparable to a 20 to 30 foot wire antenna.  It is further more designed to be used on receivers that use untuned wire antennas, such as inexpensive units and car radios...

Active Antenna, easy to build - When fate or nasty neighbours prevent you from stringing a long-wire receiving antenna, you'll find that this pocket-size antenna will give the same, or even better, reception.  This "Active Antenna"
is cheap to build" and has a range of 1 to 30Mhz at between 14 and 20dB gain....

Dipole Antenna - A simple dipole antenna can be used for improved FM broadcast signals. A dipole is basically a length of conductor (wire) split into two portions and signal is taken off at the split. It has a nominal 3 dB gain over an isotropic source and is directional, tending..

E-field Circuits - If you place the amplifier at the antenna, you avoid all that cable capacitance but your amplifier must have a correspondingly higher input impedance to maintain flat gain at the lower frequencies. For a typical 10 pF antenna (about a meter long) you would want a 100 megohm input impedance to have flat gain down to 150 Hz! One simple solution is to add some shunt capacitance across the antenna, eating ...

Ground Pole Antenna - This Antenna is most widely used all over the world. For example, when you see a police car it has a transmitter with Ground Pole Antenna The body of car serves as ground). It accepts load from 50 ohm source and has larger power output than Half-Wave Dipole Antenna...

Half-Wave Dipole Antenna (Open Dipole) - It accepts load from 75 ohm source and has much smaller power output than Ground Pole Antenna. Use this antenna only when you don't have GP Antenna. Construction: Two aluminium rods ,each of length "L" in meters are joined together through an insulator as shown in fig. From center, 75 ohm cable is feeded just like ordinary TV antenna...

J-Pole Antenna - Tuned for 89MHz in the FM broadcast band...

Medium Wave Active Antenna - This circuit is designed to amplify the input from a telescopic whip antenna. The preamplifier is designed to cover the medium waveband from about 550Khz to 1650Khz. The tuning voltage is supplieb via RV2, a 10k potentiometer connected to the 12 Volt power supply....

Pedestrian mobile HF antenna

Pi Section Coupler

Q  Multiplying Loop Antenna

QRP Antenna Tuner

RF Amplifier for Ferrite Bar Antennas

Shorty Forty Antenna - Do you have space limitation to put a 40 meter dipole. Try this Compact 40 meter antenna. .

Simple Dipole Antenna - It is very easy to create a simple 1/2 wave dipole, all you need is some lengths of wire such as the core of some mains flex or even a straightened out metal coat hanger, some co-ax cable and a connector for your scanners antenna input...

Small 915 MHz Antenna Beats Monopole - EDN-Design Ideas:    A 915-MHz data-acquisition project required a small antenna, but the available antennas lacked the necessary characteristics: efficiency, compactness—that is, smaller than a standard 3-in. monopole—with adequate bandwidth, and with amenability to modeling by inexpensive NEC-2 antenna software....

Tesla Power Receiver

The ATL-3 Loop Antenna - All ATL-3 loop windings are centre tapped and balanced w.r.t. their amplifier/receiver chassis ground, and therefore electric field interference pick up tends to self cancel. Magnetic noise fields, e.g. televisions and the electric meter box, or electromagnetically radiated interferences, may be minimised by loop rotation....

The versatile end-fed wire - A piece of wire of almost any length can be used as an antenna on the HF bands. However, just because an antenna can be made to work is no guarantee that it will perform efficiently. This article will initially concentrate on the half wavelength of wire and its use ....

TV/Radio Antenna Cable Galvanic Isolator

Unamplified Four Foot Box Loop

WIFI CAN Antenna - Got no dough for a commercial WiFi antenna? Looking for an inexpensive way to increase the range of your wireless network? A tin can waveguide antenna, or Cantenna, may be just the ticket. This design can be built for under $5 U.S. and reuses a food, juice, or other tin can....

Windscreen loop aerial - If you do not like the whip antenna on your car, you may try this alternative circuit. A one-turn loop is installed in the windscreen of the car, keeping possibly away from the metal structure of the car. This loop is terminated in a 6.5mm ring core suitable for VHF use...

Wireless Phono Oscillator - A "phono oscillator" is a simple, short-range AM band transmitter that was typically used to send the signal from a phonograph to a nearby radio, eliminating the need for an amplifier and speaker. This version uses only one transistor and...

Yagi Antenna - To improve signal transmission or reception in specific directions, basic elements, either vertical or horizontal, can be combined to form arrays. The most common form is the Yagi-Uda parasitic array commonly referred to as a Yagi array or beam. It consists of a driven element which is either a simple or folded dipole and a series of parasitic elements arranged in a plane. The elements are called parasitic because they are not directly driven by the transmitter but rather absorb energy from the radiated element and re-radiate it.

YAGI UDA Antenna

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