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In this paper, a wideband bandpass filter (BPF) with very compact circuit size is proposed. Specifically, the circuit size of a 5th-order multi-mode resonator BPF is largely reduced by replacing all transmission line sections with bridged-T coils. The resulted lumped-element BPF can then be implemented using the integrated passive device technology to achieve very compact chip size. To improve also...
In this paper, a miniature 2.4-GHz switched beamformer module is proposed. The proposed switched beamformer module is based on the integrated passive device (IPD) technology, and it integrates a 4 × 4 Butler matrix and an absorptive single-pole four-throw (SP4T) beam-selection switch into a compact module size of only 4.9 mm × 5.0 mm × 0.4 mm. The compact module size is achieved by using bridged-T...
Various kinds of broadband radio frequency integrated circuits for astronomical instrument were developed in Taiwan during past 18 years. In this paper the key technology and results, including the circuit design, testing, packaging and system integration are described.
In this work, on-chip Wilkinson power divider design with very compact size is proposed. By using bridged-T coils to replace the quarter-wavelength transmission lines in a conventional Wilkinson power divider, the circuit size can be largely reduced while the bandwidth remains almost intact. Specifically, a GaAs two-way power divider with a center frequency of 2.5 GHz and a 15-dB return loss/isolation...
In this work, a miniaturized quintuple-mode resonator bandpass filter based on the silicon-based integrated passive device technology is proposed. The proposed quintuple-mode resonator bandpass filter is designed to achieve a wide bandwidth from 4 to 12 GHz and a very compact circuit size so as to meet the IF filter requirement of the Atacama Large Millimeter/submillimeter Array (ALMA) Band-1 receiver...
In this work, a highly-selective bandpass low-noise amplifier (LNA) is proposed so as to achieve high gain, low noise, and good selectivity at the same time. As a result, the band selection filter usually connected with the LNA in a RF front-end may no longer be required. This effectively reduces the circuit size and cost of RF front-end circuitry. The proposed bandpass LNA is achieved by implementing...
In this work, a miniature broadband branch-line coupler is proposed. By implementing the quarter-wavelength lines in a three-stage branch-line coupler using bridged T-coils, the circuit size can be largely reduced with no reduction in bandwidth. Specifically, a proposed broadband branch-line coupler with a center frequency f0 = 2.2 GHz is implemented using a silicon-based IPD process. The circuit...
In this paper, the design of compact balanced combline bandpass filter in LTCC is presented. The mix coupling effect is utilized to create two transmission zeros that can be located independently in either the upper or lower stopband. Also, the effect of non-adjacent line coupling is minimized in an efficient way. The proposed filter is implemented using LTCC to achieve very compact circuit size,...
One of the solutions to overcome the problem introduced by larger characteristic parameter variation is to calibrate the characteristics of the system by a known weak signal periodically. The calibration signal can be either a signal from know celestial objects or an artificial signal source build in the telescope system. The disadvantage of the celestial calibration sources is that their orientations...
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