UHF-Band Band Pass Filter
UHF Band is the frequency band which lies between 300MHz and 1 GHz. There are many RF systems operating in the UHF Band – the most notable ones are the GSM system and the television broadcast station. It is therefore not surprising to find UHF-Band Band pass filters in these systems.
UHF-Band Band Pass Filter: Why do you need it?
In radio transmissions, it is always desirable to transmit only at particular frequencies. These set of frequencies used for transmission are called bands. To achieve transmission in a chosen frequency band, one needs to makes sure the frequencies outside the band are attenuated or cut-off.
For example, to transmit in a band of 450 MHz-470 MHz UHF band, one needs to allow frequencies in this band and block-out the rest. To achieve this goal, a UHF-Band Band pass filter is used. It will transmit a selected band of frequencies with substantially no loss in energy, but that will attenuate all frequencies either higher or lower the desired band.
Check out ABPF-450MBW25-01, a 450MHz UHF Band cavity band pass filter.
Advantages of transmitting in a Band
- You will be in compliance with the Federal Communications Commission regulations.
- Interference in the receiver is greatly minimized.
- You do not interfere with other users’ legally allocated frequencies.
- A UHF-Band Band pass filter optimizes the sensitivity of the receiver.
Types of UHF-Band Band Pass Filter
Most filters in HF and VHF bands are LC filters. In the UHF band, there are many types of filters available. These include:
- UHF LC Band Pass Filter
- UHF Cavity Band Pass Filter
- UHF Ceramic Band Pass Filter
- UHF SAW Filters
The reason for this is that filters used in the UHF Band tend to be used in large volume. This is a driving factor for many filter manufacturers to push for filter technologies which are more suitable for high volume production. Ceramic filters and SAW filters are well suited for high volme production and their price can be very low at these volumes, making them attractive for commerical applications in mobile phones.
LC and Cavity filters tend to be used for industrial and milltary systems where the usage volume is not that high, and where cost is not a driving factor.
AWG Tech produces many types of UHF-Band Band Pass Filter. Fill in the contact form below to ask about our UHF-Band Band Pass Filter today.
Ultra-High Frequencies: The Importance of Such in Communication
Ultra-high frequency (UHF) is the ITU classification for radio frequencies in the range between 300MHz and 1GHz, also known as decimeter band as its wavelengths range from one meter to one decimeter. Radio frequency waves above the UHF fall into the SHF (super-high frequency) or the microwave frequency range. On the other hand, lower frequency signals are classified as VHF (very-high frequency) or lower bands. UHF radio frequencies multiply mainly by line of sight; they are impeded by hills and huge buildings although they’re able to transmit frequencies through building walls, and frequencies are high enough for indoor reception.
UHF-Band band pass filters are widely used in television broadcasting and mobile devices. They’re also present in satellite communications including GPS, personal radio services such as Wi-Fi and Bluetooth and also in cordless phones.
Ultra-High Frequencies: The Characteristics
The main advantage of UHF transmissions is the short wavelength that is generated by the high frequency. The size of transmission and antenna reception is intertwined to the size of the radio wave. UHF antennas are relatively stubby and short. Smaller and less suspicious antennas can be utilized with even higher frequency bands.
One major disadvantage of UHF is its limited range of broadcast, most commonly known as the line-of-sight. This line-of-sight happens between the TV station’s transmission antenna and with the client’s reception antenna, as opposed to the VHF’s feature of longer broadcast range.
Ultra-High Frequencies Applications
As mentioned above, UHF is commonly used in two-way radio systems and cordless telephones, in which their transmissions and reception antennas are closely spaced. Transmissions produced by these devices don’t have the ability to travel far enough to intervene with local transmissions.
Personal radio services such as GPS are often found on UHF signals as well as in Wi-Fi signals. Also, the widely used GSM and UMTS cellular signals use UHF for cellular frequencies. Major telecommunications providers have deployed voice and data cellular networks in either UHF or VHF range. This permits mobile phones and mobile computing devices to be connected to the public telephone network and to the public internet.
UHF signals are also used in industrial, commercial, public safety and military operations worldwide. A lot of personal radio services utilize these frequencies allocated in the UHF-band, though the exact frequencies may vary significantly between countries worldwide.
Ultra-High Frequencies and Antennas
UHF signals are short enough that effective transmission antennas are also short enough to be mounted on handheld and mobile devices. On the other hand, omnidirectional UHF antennas used on mobile devices are made up of short whips or rubber-based antennas. There are also higher gain omnidirectional UHF antennas that can be produced from collinear arrays of dipoles and are utilized for mobile base stations and cellular-centered station antennas.
The short wavelengths in UHF-Band also permit high gain antennas to be relatively small. These antennas are for point-to-point communication links and UHF television reception are usually reflective array antennas.