COJOT launches active wideband antenna to provide superior performance to VHF/UHF tactical radio systems
COJOT has developed a new type of active band switching for wideband antennas used in the VHF and UHF frequency bands. The TA30512M, a wideband vehicle antenna for the 30 – 520 MHz frequency band, is the first product launched by COJOT that features this advanced technology.
The TA30512M is a low profile whip antenna that is tuned by remote control to use the optimum matching circuitry and electrical length at a particular frequency. It features an extremely fast tuning ability, which is based on PIN diode switching technology, enabling the antenna to rapidly keep up with spontaneous frequency changes and moreover to be interoperable with radio systems using frequency hopping. The TA30512M is designed in a way that also modern wideband waveforms are supported, providing a perfect fit for new generation VHF/UHF military wideband radios.
Conference Documentation - Global MilSatCom 2013
COJOT’s active band switching technology considerably improves the antenna’s overall performance and enables users and OEMs of RF systems to gain additional valuable advantages, including the following:
- Electrical length tuning: Allows the selection of the most suitable elevation pattern (upward/downward/ horizontal radiation) to align a system’s optimal performance to varying landscapes and different communication applications, e.g. ground-to-air vs. ground-to-ground communication.
Extended range or reduced power consumption:
- Achieves on average a 3 dB better gain compared to a passively matched antenna of similar size.
- Vice versa, the same radiation performance can be achieved with 50% less transmit power.
- Smaller antenna design: A gain similar to that of a passively matched antenna can be achieved with a smaller active antenna.
- Better signal quality and higher capacity: Higher out-of-band interference rejection as the antenna is operational at only a small area of the complete frequency range → resulting in a better signal to noise ratio.
Jarkko Unkeri, Head of COJOT’s R&D: “Future radio systems must support wider operating bands, because the need for higher capacity increases and the radio spectrum is getting more crowded and scattered. In a radio environment that becomes more challenging it will be crucial to enhance the interoperability between the radio device and the antenna in order to effectively tackle efficiency vs. size vs. bandwidth problems. COJOT’s TA30512M uses an active band switching technology that splits the entire frequency band into smaller portions. This approach optimizes considerably the antenna’s performance at the respective sections and additionally allows using the radio spectrum more efficiently. We are able to apply this approach to different frequency ranges and antenna types. It means that also active manpack and handheld antennas, with a similar type of technology, can be developed.“
Source : COJOT