Filter Families for Wireless Infrastructure - Ultra-Low PIM and Cavity Filters
MCV Microwave has developed three new filter families for wireless infrastructure. The first is a line of ultra-low passive intermodulation (PIM) cavity filters and multiplexers covering the TETRA and all LTE frequency bands from 300 to 3600 MHz. The typical production PIM performance is −163 dBc, measured with two CW tones, each at 43 dBm. An even lower PIM filter line with a guaranteed −173 dBc is available for PIM test bench and more demanding testing applications.
Typically, the filters have approximately 1 dB passband insertion loss, 20 dB minimum return loss, 95 to 120 dB rejection or isolation between the transmit (Tx) and receive (Rx) bands, 200 W CW power handling and −173 dBc PIM with quick-latch, blind-mate or torque-matched connectors.
These high-power, low PIM filters are suitable for small cell, tower-mounted amplifiers, Tx or Rx combiners, multiplexers, distributed antenna systems and PIM test benches. Rather than using a hybrid coupler for a duplexer, a triplexer can be used to provide power at two separate Tx frequencies with low insertion loss, saving the 3 dB loss of the hybrid.
A second new product family from MCV: cavity filters and duplexers with 1 kW CW, 8 kW peak power handling and −173 dBc PIM. Filters in this high-power line cover the 850, 900, 1800, 2100 and 2600 MHz cellular bands.
The third new product from MCV is a constant 118 dB ±3 dB PIM duplexer. For example, used in the 1800 MHz uplink band, two CW tones of 45 dBm at 1810 and 1870 MHz injected into the antenna port will generate a constant PIM at 1750 MHz. Similarly, in the 2600 MHz uplink band, two 45 dBm CW tones at 2625 and 2690 MHz injected into the antenna port yield a constant PIM at 2560 MHz.
MCV’s low PIM series bandpass filters (BCCM), duplexers (DCCM), dual duplexers (DDCCM), multiplexers (MCCMx), band reject filters (RCCM) and combiners (CCCMx) can be ordered in standard and miniature sizes, and custom requirements are welcome.