New emerging wireless systems that operate at millimeter wave frequencies, such as high data rate 60-GHz transceivers for wireless personal area networks (WPAN), use integrated antennas. The small wavelength at 60-GHz enables the antenna to be integrated either in the package or on the chip. However, on-chip integrated antennas for 60-GHz systems, built on a conductive substrate, such as comple...

Problems of radiation pattern synthesis, sidelobe suppression, or back suppression appear when using antennas with reflectors ground planes. The use a semitransparent surface allows the required shape to be synthesized efficiently through variation reflection and transmission coefficients. Effective synthesis is possible analytical formulas designed for patterns reflectors. In this article, we ...

Coupling between two collocated orthogonal circular thin-wire loops is analyzed in this paper. Two coupled integral equations for the loop currents are derived and their solution in general form is found in terms of Fourier series. Analytical expression for currents induced through the mutual coupling is obtained for the case when all loop current harmonics higher than first can be ignored. It ...

We report an enhanced broadband passive combiner structure using a dense slot-line antenna array in an oversized coaxial waveguide. A significant reduction in size has been achieved while maintaining a 6-18GHz bandwidth and capacity for 32 MMIC amplifiers. A broadband slotline to microstrip line transition is also developed and monolithically integrated with the slot-line antennas, to eliminate...

This paper focuses on the combination of method moments and wire-grid approximation as an effective computational technique for modeling symmetrical antennas with low cost accurate results. The criteria conditions use surface from various sources are presented together new recommendations antenna structures using approximation. These used to calculate characteristics biconical horn at different...

We consider the problem of finding secrecy rate of a multiple-input multiple-output (MIMO) wire-tap channel. A transmitter, a legitimate receiver, and an eavesdropper are all equipped with multiple antennas. The channel states from the transmitter to the legitimate user and to the eavesdropper are assumed to be known at the transmitter. In this contribution, we address the problem of finding th...

For the last 18 months the author has been involved with Pixel Technologies in developing and producing the high-gain low-noise preamp used with the company’s series of shielded magnetic loop antennas. Recently Pixel asked me to perform a series of comparative tests on the latest version of their loop antenna (Model RF PRO-1B) to determine how it performs relative to other loop antennas and oth...

Often amateurs are faced with limitations placed on the space available and the length of wire or number of wires that may be possible in a operational antenna at the shack. There is a particular class of homeowner that does not want to see a web of wires suspended between trees or supporting structures in neighboring property, or an unsightly tower adorned with multiple beam antennas in the ai...

The mass sensitivity of quartz-crystal microbalance (QCM) was drastically improved by removing electrodes and wires attached on the quartz surfaces. Instead of wire connections, intended vibrations of quartz oscillators were excited and detected by antennas through electromagnetic waves. This noncontacting measurement is the key for ultrahigh-sensitive detection of proteins in liquids as well a...