492S-1059A=P3 Filters

Series:	5CHW
Packaging:	Tape & Reel (TR)
Part Status:	Obsolete
Frequency - Center:	456MHz
Bandwidth:	10MHz
Selectivity:	16dB (+50MHz) 12dB (-50MHz)
Ripple:	0.5dB
Insertion Loss:	3.5dB
Mounting Type:	Surface Mount

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Helical Filters

In electromagnetic engineering, helical filters are special type of narrow bandpass filters, formed from coiled wire. They have some characteristics unique to them. Commonly, they are made from flat copper strips, although other materials and shapes are used. Their coil form ranges in shape from flat, wide strips to tight, circular coils. They are constructed in the same way as any other filter, with a specific design and resonance frequency, using a certain type of inductor located in a particular position on the substrate. The main applications of helical filters include radio communications, aerospace, military, and medical applications.492S-1059A=P3 Application Field and Working Principle

The Model 492S-1059A=P3 is a three-cavity helical filter which operates at 915MHz. It features a wide passband frequency range of 824MHz to 894MHz. It is designed for use in military radio systems, high power commercial transmitters, and high data-rate land mobile radios. The use of these filters significantly reduces power losses and increases the effective coupling of the filters to the antennas.The design of the helical filter is based on a spiral pattern design which facilitates wide pass band coverage. It is constructed by cutting the components from a copper strip and forming them into a cylindrical coil. The inductors are connected at the outer end of each component, forming a small bond. This bond minimizes the electrical components’ inductance as well as providing an expedient bond. The connection of multiple components in series provides increased gain, thereby increasing the power transfer efficiency.The 492S-1059A=P3 helical filter is able to provide high passband selectivity and low insertion losses. It is designed to pass frequencies between 824MHz and 894MHz with a maximum insertion loss of only 2dB. The electrical field used in the passband is omnidirectional, so its application can be used in multiple antenna applications.The design consists of three cylindrical inductors which are connected to three total adjustable capacitive loading circuits. The adjustable capacitive loading circuits improve the impedance matching. By using these three inductors, the pass-band is widen significantly, thus minimizing losses due to the presence of additional components in the circuit.The working principle of the 492S-1059A=P3 helical filter is based on creating a very precise impedance match between the antenna and the RF source by adjusting the capacitive loading circuit. The inductors are designed and connected in such a way that only signals with the correct frequency are allowed entrance into the circuit, while suppressing unwanted frequencies, making sure that only those in the desired range will be emitted. In applications where the 492S-1059A=P3 helical filter is used, the improved efficiency obtained thanks to the precise impedance match between the inductors and the capacitive loading element can result in improved performance and power uptake. In mobile device applications, the additional power savings realized can also lead to improved battery life.Overall, the 492S-1059A=P3 helical filter is a very efficient, cost-effective solution for applications requiring neater frequency passband performance with minimal insertion losses. Its ability to provide a wide coverage in terms of frequency passband and improve the impedance match between antenna and RF source, makes it an ideal choice for many types of high-power transmitters or mobile radio applications.

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