A miniaturized GPS antenna in LTCC with linear polarization suitable for SoP integration

In this paper, a new miniaturized GPS antenna is presented. The antenna design is based on a dipole topology and is intended to operate at the L1 frequency of 1.575GHz. A conventional λ/2 dipole would be too large at this frequency so miniaturization techniques have been applied. The result is a planar antenna whose dimensions are 32mm × 24 mm, making it one of the smallest GPS antennas ever reported. It exhibits a good impedance match and positive gain at the desired frequency. Furthermore, the antenna incorporates the option of end-loading for bandwidth enhancement. The chosen material system is Low Temperature Co-fired Ceramic (LTCC). This, along with its small size, makes it suitable for integration with System-on-Package (SoP) designs

Miniaturized, lumped-element filters for customized system-on-package l-band receivers

The system-on-package (SoP) approach to design wireless front ends has proven to optimize the tradeoff between performance and size. In this paper, two new and highly compact bandpass filters are presented that show the greatest degree of miniaturization of any bandpass filters presented to date when their volume is measured in guided wavelengths. A novel packaging technique where most of the filter components are folded beneath the resonator inductors allows for this level of miniaturization. The filters are designed as lumped-element equivalent circuits and fabricated in standard low-permittivity low-temperature cofired ceramic technology that makes them suitable for embedding within a mass-producible SoP solution. In addition, electric and magnetic couplings are used to create finite transmission zeros that enhance the selectivity of these filters. The second-order filter demonstrates an insertion loss of 2.2 dB and a 3-dB bandwidth of 11% at a center frequency of 1.524 GHz. Meanwhile, the fourth-order implementation shows an insertion loss of 4.92 dB and a 3-dB bandwidth of 6.6% at a center frequency of 1.521 GHz. In both cases, the agreement between simulations and measurements is excellent. Careful analysis of individual capacitors and inductors comprising the filters is provided to explain the link between process parameters and actual measured performances

MESH SIMPLIFICATION IN PARALLEL

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EMI measurement of small systems using an absorbing clamp

A 30 MHz - 300 MHz Absorbing Clamp, standardized by the Comite ilnternational special des perturbations radioelectriques (CISPR), can be used in design testing to optimize radiated emissions from small systems, whose physical size is small in comparison with a wavelength, and for which the electromagnetic interference is radiated mostly by the cables. The Absorbing Clamp is a simple, repeated test which requires less investment in time and cost than Open Field Site testing, which is the main alternative. During an engineering phase of the product development stage, repeated testing is done to assess the impact of design modifications on system performance. Successful use of the Absorbing Clamp during product development, to evaluate the impact of design modifications on system radiated electromagnetic emissions, is demonstrated. Test results confirm that the Absorbing Clamp is a repeatable and inexpensive test method for EMC engineering on small systems