PCB Log Periodic Antennas or Log Periodic Printed Circuit Board Antennas are the antennas made by Kent Electronics on Printed Circuit Boards (PCB). These are also called as Printed Antennas. PCB Log Periodic Antennas are broadband antennas used for HD Television (HDTV), wireless networking, analog cellular telephones, and other broadband applications. PCB Antennas are a very cost-effective alternative, which at the same time meets the highest expectations.

Log-periodic Antennas

Log-periodic Antenna (LPA, also known as a log periodic beam antenna/aerial or log-periodic array) is a broadband, multi-element, directional, narrow-beam antenna that has impedance and radiation characteristics that are regularly repetitive as a logarithmic function of the excitation frequency.

Design and Construction of Log-periodic Antennas

The individual components are often dipoles, as in a log-periodic dipole array (LPDA). Log-periodic antennas are designed to be self-similar and are thus also fractal antenna arrays. The lengths and spacings of the elements of a log-periodic antenna increase logarithmically from one end to the other. A plot of the input impedance as a function of logarithm of the excitation frequency shows a periodic variation. Log-periodic Antenna design is used where a wide range of frequencies is needed while still having moderate gain and directionality. It is sometimes used for (VHF/UHF) television antennas and for short-distance UHF RF Wireless communication.

As a general guide the longest element is slightly longer than a half wavelength while the shortest elements are on the order of a quarter wavelength. the more pointed the antenna the higher the gain. From 6 dBi to around 12 dBi gain is easily achieved. There are a number of “optimum” design curves around for your reference.

Kent PCB Log Periodic Antennas

Log-Periodic Printed Circuit Board Antennas

Log-Periodic Printed Circuit Board Antenna (Image: Kent Electronics)

Kent Electronics is making PCB Log Periodic Antennas for various applications and at different frequency ranges. The price of Kent Electronics PCB Log Periodic Antennas are comparatively low, and starts from USD $7 to as hisgh as USD $28, based on the antenna features and technical specifications.

  • 400 – 1000 MHz log periodic printed circuit board antenna gives great performance from 400 – 1000 MHz. This range includes all broadcast UHF High Definition television (HDTV) channels.
  • 850 – 6500 MHz log periodic printed circuit board antenna gives great performance from 850 – 6500 MHz. This range includes old analog cellular telephones, wireless networking, and other hobbyist applications at 2.4GHz.
  • 2100 – 11000 MHz (2.1 – 11 GHz) log periodic printed circuit board antenna gives great performance from 2100 – 11000 MHz. This range includes wireless networking at 2.4GHz (802.11b/g) and 5.8GHz (802.11a). This wide range works well for frequency sweeps and other HDTV broadband applications.
  • 900 – 2600 MHz log periodic printed circuit board antenna gives great performance from 900 – 2600 MHz. This range includes old analog cellular phone, wireless networking, and other hobbyist applications at 2.4GHz.

There are software programs such as IE3D and HFSS than can analyze a log periodic antenna on a dielectric surface (PCB). HFSS will do fine with a simulation, particularly as you can model the feed detail as well. It will work fine provided you have enough RAM.