Introduction of PCBA chip frequency device

Introduction of PCBA chip frequency device

Laminated chip Bluetooth antenna

Bluetooth technology is a hot field at present, and its prospect is unlimited. Murata recently launched LDAG2 laminated chip antenna specially used for Bluetooth high-frequency module, with the size of 9.5 × two × 2.0 (mm), the antenna gain is - 3 dBd in 3600 in the horizontal plane and - 3 ～ 20 dBd in the vertical plane.

SMT surface mount dielectric filter/resonator

This kind of PCB product has long been developed and used, especially in mobile communications. Recently, there is a new development. On a piece of microwave ceramic medium, a through-hole is made at an appropriate position, and the surface of the dielectric block is metallized and an excitation electrode is made. In this way, the ceramic dielectric block is divided into several resonators, which are coupled with each other to form a dielectric filter. It has no shell and coupler, and its size is much smaller. The size of a second-order dielectric filter on the PCB is only 5.8 × eight point two × 3.0 (mm), and is conducive to the development of higher microwave frequency band (above 10GHz).

PCBA surface mount SAW filter

This kind of device is mostly used in mobile communication IF filter, and develops rapidly. The line spacing of interdigital transducers of SAW devices should be 1/4 wavelength, which was previously considered as an obstacle for SAW devices to expand to high frequency, and 1GHz will be the upper limit of frequency. However, due to the continuous progress of semiconductor micro processing technology in recent years, this upper limit has been broken. The size of SAWSG and SAFSG subminiature SAW band-pass filters launched by Murata last year is only 2.5 × two × 1.1 (mm), the pass band center frequency of the former is 895MHz, and the latter is 1950MHz. Used for W-CDMA.

Laminated chip LC filter

A few years ago, TDK, MURATA and other companies integrated several L's and C's by using stack co firing technology to produce stacked chip LC assemblies, such as low-pass filters, high pass filters, band-pass filters, notch filters, delay lines, etc. In recent years, there has been great development in technology, especially LC filter has been widely used in mobile communication and EMI countermeasures. There are many kinds of LC filters produced by Murata, with frequency coverage ranging from tens of MHz to 2.5 GH and size of 5.7 × 5.0、4.5 × 3.2、3.2 × 2.5、2.0 × 1.25 (mm)。 At present, it is developing towards smaller size and higher frequency (above 3GHz). In order to meet the requirements of electromagnetic compatibility, TDK has developed a variety of EMI countermeasure filters and made them array, such as integrating 8 T-shaped LC filters into 8 × two × 2 (mm).

PCBA surface mounted quartz crystal devices are rapidly developing towards miniaturization surface mounted quartz crystal devices under the strong impetus of the mobile communication market. The mainstream size of SMD temperature compensated crystal oscillator TCXO has changed from 9 × seven × 2 (mm), volume 0.13CM3, transition to 7 × five × 1.7 (mm), volume 0.06CM3, and 5 × three point two × 1.5 (mm), volume 0.02 CM3. The size of SMD VCXO is reduced to 5 × three × 1(mm)。 These SMD devices are used in PCBA electronic products such as handhelds, PCs, PDAs, LAN cards, A/V.

Circuit board assembly surface mount microwave device

With the development of mobile communication towards high frequency, especially the advent of WDMA, the requirements of miniaturization and surface mounting have been put forward for some microwave devices, and some new products of surface mounting microwave devices have emerged.

LDH21 Laminated Chip Delay Line

Size 2.0 × one point two five × 0.95 (mm), delay 60~1200ns. LDB18 laminated chip balancer size is 1.6 × zero point eight × 0.7 (mm), the frequency range is 1.7 ～ 4.5 MHz, the insertion loss is less than 1.4 dB, and the amplitude balance is less than 1 dB.

Chip media Bluetooth antenna

This is also a chip antenna specially designed for Bluetooth technology. The model is G2 and the size is 15 × seven × 6 (mm), frequency range 2400-2500MHz, voltage standing wave ratio less than 2.0, antenna gain is very high in the horizontal plane, but poor in the vertical plane. At present, Murata has reached the production scale of 1 million pieces/month.

CE040 surface mount isolator/circulator

Size 4 × four × 2 (mm), frequency range 1920-1980MHz, insertion loss less than 0.55dB, isolation greater than 14dB.

SMT surface mount duplexer

DFYM size is 14 × eleven × 3 (mm), the insertion loss is less than 2.6dB, the isolation at the receiving end is greater than 41dB, and the isolation at the transmitting end is greater than 55dB. The frequency of DFYK is 1800 ～ 2000MHz, and the size is 12.6 × five point three × 2.0 (mm), the insertion loss from the transmitter to the antenna is less than 1.5dB, the insertion loss from the antenna to the receiver is less than 2.4dB, and the isolation is greater than 50dB. It is used for W-CDMA.

Thin film bulk acoustic resonator/filter

Thin film bulk acoustic resonator FBAR is made of bulk acoustic wave PCBA OEM substitute (rather than surface acoustic wave) excited in piezoelectric material film. It has the advantages of high frequency, small size, high efficiency, and is compatible with semiconductor technology. It is easy to integrate with other components. FBAR can be used to make filters, oscillators, duplexers and other high-performance frequency devices. The volume of FBAR filter made by PCBA is 20% smaller than that of SAW filter. Samsung's watch type CDMA mobile phone and AirPr ime's CDMA mobile phone with PDA function both use FBAR devices.