Huy Nam Chu

Periodic Synthesized Transmission Lines With 2-D Routing Capability and Its Applications to Power Divider and Couplers Using Integrated Passive Device Process

A novel periodic synthesized transmission line, comprising periodic unit cells and specially treated corner cells, is proposed and realized using integrated passive device technology. The key innovation is the square unit cell, formed by an asteriated strip overlapped with a capacitive pad. It enables 2-D layout routing since any two of the four arms of the unit cell can serve as the input/output ports. To account for the discontinuity effect at bends, the corner cells are developed independently as a pure lumped T-network to reduce the undesired signal reflection at junctions. Quarter-wavelength synthesized lines are jointed together as miniaturized on-chip couplers. The experimental results demonstrate the compactness of the on-chip components, in addition to their good electrical responses. The uniqueness of the design concept is clearly validated.

Two-Element Retrodirective/Beam-Switching Array Using Dual-Mode Coupler

A simple two-element integrated array, capable of dual-mode operations, is investigated. With the feeding network unchanged, the integrated array is identical to a reflection-type retrodirective array in one band, but automatically reconfigures as a beam-switching array with mutually orthogonal sum and difference patterns in the other band. The core building block is a dual-mode coupler, which functions identically to a 90° hybrid coupler and a 180° hybrid coupler, respectively, in the two bands. By integrating this unusual dual-mode coupler with reflection loads, diplexers, gain stages, and antennas, a planar integrated array is demonstrated on a printed circuit board. The idea is supported by experimental results including

On-chip liquid detector using synthesized transmission line on integrated passive device process

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Fully Planar Amphibious Antenna Using Dual-Operational Mode Synthesized Transmission Lines

-parameters and radiation patterns.

A decoupling network for two-element array using uniform coupled-line sections

In this paper, we investigate a compact on-chip liquid detector fabricated by integrated passive device (IPD) process. The on-chip detector simply consists of a section of dual-operation mode synthesized transmission line, whose electrical properties are highly depended on the material medium surrounding the chip. Specifically, the capacitance of the line changes in accordance with the dielectric constant of that medium, which in turn shapes the transmission response of the line. The synthesis equations are first introduced, followed by its application to extracting the complex dielectric constant of unknown liquid such as the alcoholic solutions.

Reconfigurable Dual-mode Integrated Beam-steering Array

A fully planar amphibious antenna, capable of providing efficient radiation when surrounded by air as well as by water, is demonstrated. Benefiting from a dual-operational mode passive matching network that simply consists of a synthesized transmission line and a common delay line, the antenna is well matched in both the media with acceptable total efficiency. The synthesized line, comprising merely six quasi-lumped elements, functions identically to a conventional line in air, but automatically reconfigures as an open circuit in water. The design principle and synthesis procedure are introduced in detail. The planar antenna, with a size of 0.115 × 0.094 λ20 and weighing 8 g, is operated in the 433-MHz industrial, scientific and medical (ISM) band. When surrounded by air and water, the measured -10dB fractional bandwidths are 3.2% and 14.5%, respectively. The average gain and total efficiency are -3.6 dBi and 34.5% in air, and become -8.8 dBi and 15.4% when immersed in water.

An Extended

A decoupling network for two-element closely-spaced arrays is investigated in this paper with rigorous design formulas. The proposed scheme deals with even-/odd-mode matching and decoupling requirements individually and can achieve overall excellent impedance matching and isolation at the same time.