Embedded air cavity backed microstrip antenna on an LTCC substrate

Rectangular patch on air and air-dielectric composite substrates to achieve improved radiation characteristics

“…INTRODUCTION Microstrip patch of rectangular geometry etched on a grounded substrate is well known kind of printed antenna, normally radiating linearly polarized wave with typically 6 dBi gain. Some researchers had employed mixed substrate configuration like, wedge shaped air-dielectric [1] and micro machined air cavities on LTCC substrate [2]. Some more investigations with different structures are reported in [3]- [4].But only a few handful investigations dealt with microstrip patches with air/composite substrate from the point of view of improved radiation characteristics .…”

Overview on fabrication of three-dimensional structures in multi-layer ceramic substrate

“…Cross-sectional picture of an antenna-containing embedded cavity fabricated using a gluing technique. 6 is attributed to the presence of excessive organic adhesive material. The solvent (used as an adhesive material) can melt the LTCC tape surface.…”

“…For example, a sintered, unpatterned multi-layer ceramic substrate can be glued to another sintered substrate containing a cavity, encapsulating that cavity. 5,6 Relatively large embedded cavities (e.g. with areas of 18.6 mm × 18.6 mm 5 and 14 mm × 11 mm 6 ) have been fabricated using this technique for high-frequency antennae (see Fig.…”

“…[1][2][3][4] In addition, these three-dimensional structures are being explored to improve the performance of RF devices for high-frequency applications. Since embedded air is an ideal dielectric medium, 60-GHz patch antennae 5 and micro-strip antennae 6 have been realized in multi-layer LTCC substrates containing embedded cavities.…”

Study of deformation and porosity evolution of low temperature co-fired ceramic for embedded structures fabrication

“…The observed saggings after sintering for suspended threelayers and six-layers self-constrained laminates were less than −120 m. These results indicated that supporting medium is not necessary during sintering for the fabrication of relatively large embedded structures (with width ranges 15-25 mm) made of self-constrained LTCC material. The fabrication of large embedded cavity is practically useful in realizing embedded air cavity for stacked patch antennas 18,19 and pressure sensor. 13 …”