302HXPK-1341D1

Series:	7HT
Packaging:	Bulk
Part Status:	Obsolete
Frequency - Center:	813MHz
Bandwidth:	17MHz
Selectivity:	16dB (+50MHz) 23dB (-50MHz)
Ripple:	0.5dB
Insertion Loss:	3dB
Mounting Type:	Through Hole

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Helical Filters

Helical filters are a type of filter that uses a helical structure to realize a number of different functions such as suppression of undesired frequencies, bandpass attributes, and even radio frequency interference (RFI). The specific filter in question is the Motorola 302HXPK-1341D1 which is a Soret Alps Voltage Controlled Oscillator (VCO).

Architecture

The Motorola 302HXPK-1341D1 filter consists of a planar spiral resonator formed on a substrate of aluminum nitride in the manner of a Bessel function with a specific inductance and capacitance. Essentially, the filter works by creating frequency-selective elements around the circumference of the structure. This structure is used to limit the bandwidth of the VCO and match it to the specific filter response desired. The filter further includes several capacitors and resistors integrated into the planar spiral itself rather than external components for a compact footprint during construction.

Application Fields

The 302HXPK-1341D1 filter can be used for a wide variety of applications such as automatic meter reading, automotive electronics, two-way radio communications, power line communications and wireless LANs. It has a low insertion loss over its entire operating temperature range (-40°C to 125°C), making it a reliable and accurate element of all of these systems.

Working Principle

The working principle of the chip is simple and efficient. This VCO operates at a center frequency of 4.2 GHz with an adjustable frequency range of400 MHz, while at the same time being able to achieve better than -20 dB harmonic suppression over its portfolio of frequencies. The filter is able to achieve such results because of its two integrated elements: the inductors and capacitors. These two elements are designed to interact with one another in order to create a smooth impedance profile along the resonator\'s circumference. This configuration allows the filter to produce a specific frequency and prevent any frequencies outside of that range from entering the system. The inductors are designed to create a constant inductive load along the entire circumference of the resonator, while the capacitors are set to create specific capacitances along the circumference. These two components allow the filter to provide a constant impedance profile along the frequency range, which is what allows it its high insertion loss in the desired frequency band and its harmonic suppression.

Advantages

The Motorola 302HXPK-1341D1 filter is known for its small size and low power consumption, which make it suitable for many wireless applications. This filter also offers high reliability due to its planar spiral resonator structure and is able to require very little external circuitry, making it ideal for applications where space is a concern. Finally, its adjustable frequency range of 400 MHz is ideal for wireless applications that require a wide variety of operation bands. In conclusion, the Motorola 302HXPK-1341D1 helical filter is a great option for a variety of applications that require high performance and excellent reliability. Its small size, low power consumption and adjustable frequency range make it an ideal choice for modern day electronic systems.

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