|
The duplexer, connected to the lower part of the antenna of a mobile communication device, separates and delivers frequencies received and transmitted among various radio signals, passes only necessary signals during reception and transmission, and removes unnecessary signals. The most frequently used duplexer type is the monoblock type.
As the duplexer occupies a large area in a mobile device, many companies have continuously sought to minimize its size, and to realize its miniaturization, they have exerted efforts at developing new circuits, structures, and materials.
The mobile duplexers produced by MTC are WCDMA, US-PCS, K-PCS, and CDMA (800 MHz bandwidth). WCDMA and K-PCS have been miniaturized to 5x5.4 mm and 7x5 mm, respectively, competing against SAW Duplexer and FBAR Duplexer. WCDMA and K-PCS have advantages, however, over their competitors: they have better performance and a reasonable price.
In the dielectric field, MTC produces, besides DMB Filter for mobile phones, filters for cordless phones (2.4 MHz, 5.8 MHz) and filters for GPS devices as well as various types of duplexers and filters for base stations and relay stations. |
RF Module is an integrated high-frequency reception and transmission circuit in a communication device. Every wireless communication device consists of RF, which converts the voice signal frequency into a high-frequency range so it could be sent far away, receives the signal in a high frequency, and converts it back to the original frequency range, Base Band, which reproduces the high-frequency signal accurately, and Logic Part. RF Module is a one-module integration of this RF part.
Although RF modules have only recently emerged as a promising business area in the communication device market, they had long been commercialized in the home appliance division. TVs, VCRs, and satellite-receiving tuners are individual RF module products.
Among communication devices, 900MHz wireless phones have begun actively using RF modules. In the future, RF modules will be found more frequently in mobile phones and PCS devices, creating an independent business area. |
A filter, a key component of RF systems and other electronic circuits such as mobile communication and relay devices, delivers only necessary signals among various radio signals, and removes unnecessary signals. MTC produces dielectric filters.
The dielectric filters developed and produced by MTC are the monoblock type, which means that they consist of a block of various resonators. The advantages of the monoblock type are that it no longer requires additional parts as the combination circuit for combining resonators and the external circuit are constructed either in an external pattern or a hole, and that it made volume production possible, thus realizing a low price tag.
MTC is consistently promoting the miniaturization of filters to acquire a competitive edge over its competitors, such as SAW chips or chip LC filters. Towards this end, MTC continuously researches on and develops new circuits, structures, and materials.
Besides its flagship base station and relay station filters, MTC will also concentrate on developing and supplying filters used in DMB/DAB, GPS devices, and wireless mobile phones at 5GHz. |
|
