Neko
Supreme Overlord
Dec 12, 2003, 2:41 AM
Post #1 of 1
(4147 views)
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June 3, 2003 - Kyocera Corporation (President: Yasuo Nishiguchi) has announced the development of three new types of antenna switch modules, which switch transmission and reception signals in the front end of GSM mobile phones. The new products support multiple bands, Dual/Triple/Quad Band, and are smaller, thinner and lighter than conventional products with reduced loss and lower current consumption.
GSM mobile handsets are not only becoming smaller and lighter, but also progressing in multiple band systems, such as Triple Band which adds GSM850 in the Americas to the conventional Dual Band system of the European GSM/DCS, and Quad Band which also adds PCS in the Americas. Consequently, small size and multiple bands become increasingly important for antenna switch modules, switching devices for transmission and reception signals in the front end.
Kyocera has achieved a small size for the passive circuit elements embedded in the substrate as well as low loss in the filter circuit by using our original LTCC (Low Temperature Co-fired Ceramics) substrate with its high Q (typical 4000 at 2GHz) and high dielectric constant (18.7). This in turn has enabled us to develop three antenna switch modules with the world's smallest size of 4.5 x 3.2 x 1.5mm, compatible with Dual, Triple and Quad Bands.
These tiny antenna switch modules make the front end of GSM mobile phones small and low profile, contributing to mobile handsets with smaller size and multiple functions. Responding to environmental concerns, all three products are lead-free.
The Quad Band-Compatible, GaAs MMIC Switch Type "LX-Q615S Series"
The LX-Q615S series is a Full Quad Band antenna switch module equipped with two transmission terminals and four reception terminals, supporting four bands of GSM850, GSM900, DCS and PCS. This product has the world's smallest and thinnest size at 4.5 x 3.2 x 1.5mm (max) by using Kyocera's unique LTCC substrate with high Q (typical 4000 at 2GHz) and high dielectric constant (18.7), and also by downsizing the strip line, capacitors, and filters embedded in the substrate.
This allows a 34% reduction in the assemble area, and makes the product 0.3mm thinner compared to the conventional Kyocera product (the LM-D518 series: 5.4 x 4.0 x 1.8mm). This will be a significant contribution to manufacturers designing smaller, lighter and low profile mobile handsets.
Also, by employing silver metal with lower resistance for internal conductors as well as the high Q value of the LTCC substrate, we have reduced conductor loss and radiation loss, and have achieved low insertion loss, something that is critical to the characteristics of antenna switch modules.
This product employs the GaAs MMIC as the switch device, dramatically reducing current consumption to a maximum 0.5mA. Since the decode circuit of the switch is built into the MMIC, switching operations are therefore performed using three control lines, which enables simplified peripheral control circuits.
To prevent a breakdown by the electrostatic surge of GaAs MMIC, a protection circuit is installed in the antenna terminal, so that this product meets the European Norm EN61000, and will not break down even with a +/-3KV contact electric discharge to the antenna terminal. Combined with the antenna choke coil, this module can withstand a +/-8KV contact direct electric discharge.
The Dual/Triple Band-Compatible, PIN Diode Switch Type "LM-D615S/LM-T615S Series"
The LM-D615S/LM-T615S series uses a PIN diode as a switching device, making it the world's smallest and thinnest switch module at 4.5 x 3.2 x 1.5mm (max). As in the LX-Q615S series, this product has low insertion loss through a high Q and high dielectric constant LTCC substrate with a silver conductor. For the Dual Band antenna switch module LM-D615S3 series, typical values are GSM Tx 1.0dB, DCS Tx 1.2dB, GSM Rx 0.8dB and DCS Rx 0.9dB.
Moreover, while the LM-D615/LM-T615 series supports the Dual/Triple Band, it is compatible with a combination of four bands (GSM850, GSM900, DCS and PCS) by broadening the bandwidth for transmission and reception. Thus, the product has applications for worldwide GSM Dual/Triple Band mobile handsets.
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