SAW Filter Bank Research Articles

Ku 대역 대용량 공용데이터링크용 RF 송수신기 설계

본 논문에서는 유무인항공기에서 사용될 통달거리 200 km, 전송속도 45 Mbps급 데이터 전송장비의 RF 송수신기에 대해 다룬다. RF 송수신기는 Ku 대역에서 동작하도록 설계되었으며, 상/하향 변환모듈, 고출력 증폭 모듈, 전단 처리 모듈로 구성된다. 제안된 RF 송수신기의 성능을 만족시키기 위해 출력신호 레벨이 10 W급인 전력 증폭기가 요구되었으며, 이는 GaN 소자기반의 전력증폭기로 구현되었다. 또한, 적응형 전송속도 변환기능이 요구되었고, 이를 위해 다양한 대역폭의 신호를 수신할 때의 상호 주파수 간섭을 최소화하기 위하여 6종의 SAW 필터로 구성된 수신기 구조가 적용되었다. 시스템 요구사항의 만족 여부를 확인하기 위해 AWR 시뮬레이션 툴을 이용하였다. In this paper, we designed a RF transceiver operating up to 200 km operating range and 45 Mbps data rate. The RF transceiver operates in Ku band and composed of up/down converter, high power amplifier, front-end elements. To satisfy the operating range of RF transceiver, 10W power amplifier was required and realized by using GaN power amplifier. Moreover, to mitigate mutual interference for different bandwidth signals due to the adaptive transmission speed control function, SAW filter bank structure was used. To verify system requirement satisfaction AWR simulation tool was used.

Development of Miniature Quad SAW Filter Bank based on PCB Substrate

This paper describes the development of a new <TEX>$5.0{\times}3.2mm$</TEX> SAW filter bank which is consist of 12 L, C matching components and 4 SAW bare chips on PCB substrate with CSP technology. We improved the manufacturing cost by removing the ceramic package through direct flip bonding of <TEX>$LiTaO_3$</TEX> SAW bare chip on PCB board after mounting L, C passive element on PCB board. After that we realized the hermitic sealing by laminating the epoxy film. To confirm the confidentiality and durability of the above method, we have obtained the optimum flip bonding & film laminating condition, and figured out material property and structure to secure the durability & moisture proof of PCB board. The newly developed super mini <TEX>$5.0{\times}3.2mm$</TEX> filter bank shows the superior features than those of existing products in confidence, electrical, mechanical characters.

Research progress in SAW filter banks

Research progress in SAW filter banks

Microwave SAW bandpass filters for spacecraft applications

Microwave SAW bandpass filters for spacecraft applications are described. Two SAW bandpass filters were designed and fabricated in the 1.5 GHz band using temperature-stable ST-cut quartz substrates. The SAW bandpass filters were then assembled in a SAW filter bank. One unique feature of the SAW filter bank is that a broader band is available merely by adding the outputs of SAW bandpass filters adjacent in the frequency domain. Measured electrical responses as well as results of a transmission experiment show satisfactory performance. Effects of the temperature and aging stability characteristics are investigated based on the measured and calculated responses. >

Design of saw filters in SS‐FDMA routers for mobile satellite systems

AbstractThe present paper reports the design of a SAW filter bank consisting of 26 linear phase filters with bandwidths ranging from 60 to 2180 kHz, 0·5/40 dB transition width narrower than 30 kHz and stopband rejection as high as possible. Passbank amplitude and phase ripple limits are 1 dB and 4° peak‐to‐peak respectively. Three candidate filters of bandwidth 60 kHz, 400 kHz and 2·180 MHz were selected for detailed design, taking into account spurious effects such as acoustic regeneration and diffraction as well as technology limits. Since the physical length of a SAW filter—as any transversal (FIR) filter—is determined by (i) the required passband amplitude ripple, (ii) the stopband rejection level and (iii) the transition width, the steepness of the required passband‐to‐stop band transitions in these filters dictates their physical size to be unusually large, resulting in an overall size for each packaged filter of 360 × 38 × 17 mm, i.e. 14·2 × 1·5 × 0·7 inches. The electrical specifications are met by all but the 2180 kHz filter, whose shape factor, for a 30 kHz transition band, would be 1·027 : 1, beyond the state of the art. The filter bank has about 27 dB insertion loss per filter, plus roughly 14 dB (1 : 26) power split loss.

A Versatile SAW Filterbank Derived from the Optical Diffraction Grating

Conception d'un filtre a 32 canaux constitue d'un reseau de transducteurs d'entree fournissant une direction de propagation dependant de la frequence et un certain nombre de transducteurs de sortie selectifs en fonction de l'angle d'incidence

A Review of SAW-Based Direct Frequency Synthesizers

Many new electronic systems, including spread spectrum links, require frequency synthesizers capable of providing accurate signals of high spectral purity, and must be able to change frequencies in fractions of a microsecond. Three such synthesizers based on comb generators, SAW filterbanks, and fast switches are reviewed. Each of these synthesizers can provide an output at approximately 1.3 GHz from one of over 200 frequencies of integral megahertz value.

A circuit approach to SAW filterbanks for frequency synthesis

A SAW filterbank (2.5 × 0.9 cm) coupled to a miniature silicon-on-sapphire (SOS) p-i-n diode, multiple-input single-output RF switch array (2.5 × 0.25 cm) forms the basis of a very compact UHF frequency synthesizer. In this paper the operation, design, fabrication, and performance of rapid-switching SAW frequency synthesizers is described. Experimental measurements depicting the spectral purity of the waveforms synthesized by two devices; one fabricated on LiTaO 3 and the other on AlN-on-sapphire, operating over respective frequency ranges of 520-650 MHz and 970-1210 MHz are provided.