Multiband Feed System

A: There are several types of multiband antennas commonly available:
Dual-band, supporting 2 frequency bands.
Tri-band, supporting 3 key frequencies.
Quad-band, active across 4 frequency bands.
Penta-band resonant at up to 5 frequency bands.

A: Multiband antennas are designed to operate on multiple frequency bands, allowing them to support a variety of communication systems and services. By using a single multiband antenna, it reduces the need for separate antennas for each frequency band, thus saving space and improving overall system performance.

A: Multiband antenna is designed to operate on five distinct frequency bands. To analyze the performance of a multiband antenna, various parameters can be considered, including: Bandwidth, Return loss, Radiation pattern, Gain and VSWR.

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A: A multiband antenna operates on a number of frequency bands that are appropriate for a number of applications, including Wi-Fi, WiMAX, Bluetooth, GSM, GPS, satellite communication, RADAR, ISM band applications for household devices, scientific, and industrial systems.

A: The design of multi-band antennas includes dual-band, tri-band and quad bands covering various wireless frequency bands such as GSM (900MHz and 1800MHz), ISM (2.4GHz and 5.8GHz), WiMAX (3.5GHz) and WLAN (5.2GHz).

A: Satellites in different constellations use different frequencies. In the main, all receivers can be divided into two categories: single-band and multi-band. The core difference is that single-band receivers only work with one frequency, while multi-band receivers fetch several frequency bands.

A: Ku-Band ranges from 10.9 – 12.7 GHz for receiving and 13.7 – 14.5 GHz for transmitting. C-band, with its lower frequency, allows operation regardless of weather conditions, especially the rain effect, and is most suitable for tropical regions with heavy rainfall.

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A: An end-fed antenna is a type of antenna that is fed at only one end. It is typically a long wire antenna, the length of which is adjusted to about half the wavelength and becomes multi-band capable by adding coils that shorten the wavelength to allow efficient radiation and reception of radio waves.

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A: Counterpoise. At end fed antennas a certain current flows into the antenna, but according to “Kirchhoff's current law” a proportional amount of current must flow somewhere else. Without counterpoise this will be the outside of the coax cable. A good way to minimize this is to create a counter-capacity.

A: The requirements for various other end-fed antennas depend on their length. If you use a "complete" antenna like a dipole or a ground plane (that is, one that doesn't require your feedline to connect to ground), you don't need a RF ground, as long as you keep common-mode currents off your feedline.

A: But be warned – End-fed antennas can be noisier and also cause more EMC/interference problems. However, they can be a cheap and easy way to get a multi-band antenna up for the HF bands, but you must usually use an Antenna Tuning Unit (ATU) or other matching device.

A: So a good length for 3.6 MHz would be 65 feet. For 7.1 MHz, 33 feet would work well. Odd multiples will also work. For example, 3λ/4 would be 195 feet for 3.6 MHz and 100 feet for 7.1 MHz.

A: It is important to use a counterpoise. A standard recommendation for the 40m band (see QST, March 1936, p. 32, "An Unorthodox Antenna") is an 84' long end fed and a 17' long counterpoise (6.5' for 20m).

A: The feeding point of a multiband End Fed antenna is practically a wide band impedance transformer. This means that the end fed wire antenna, which has a very high impedance of around 2500 Ohm, is transformed to an impedance of 50 Ohm. This impedance suits best to most tranceivers.