Graduate School of Engineering, Chiba University, Chibashi, 263–8522 Japan 広帯域な円偏波特性をもつアンテナとしては,軸 モードのヘリカルアンテナ [2] や,直交する 2点から 90◦ 位相差で給電するパッチアンテナ [3] が報告され ている.一般に衛星通信移動局用アンテナでは,前述 の広帯域特性をもつアンテナをアレー化して利用して いる.ゆえに,10%程度の周波数帯域幅をもつ円偏波 の素子アンテナが必要となる.これまでに,このよう な衛星通信システムに適用可能な円偏波アレーアンテ ナの構成法について,いくつかの報告がなされている. 報告例を大別すると,広帯域な円偏波特性をもつ素子 アンテナで必要な帯域幅を確保する方法 [4]~[6] とア レーアンテナの構成を工夫して必要な帯域幅を確保す る方法がある [...

A report is given on some linear and circular polarimetric observations of young solar-type stars. Despite a somewhat high level of instrumental polarization, the measurements were able to detect polarizations ∼ 0.0001 or 0.01%. Temporal variability has been discovered for 59 Vir with an indication that circular polarization is also present. A polarization at a level of p ∼ 1% was found associa...

In a three-dimensional arrangement of 25 congruent nonoverlapping infinite circular cylinders there are always two that do not touch each other.

Spectroscopic studies with linearly or circularly polarized light of partially aligned molecular samples can provide two kinds of important information. One type of information is the molecular · alignment; the complete molecular orientation distribution function can not be found, but its essential properties can be determined, and these frequently enable a detailed interpretation of the spectr...

We theoretically explore a scheme for generation of bright circularly and elliptically polarized high-order harmonics by bursts of linearly polarized pulses with a rotating polarization axis. Circularly polarized harmonics are formed if the bursts are comprised of N pulses that uphold an N-fold rotational symmetry, for N > 2. Rotating the polarization axes of the comprising pulses can generate ...

We report here the detection of circular polarization in the Galactic Center black hole candidate, Sagittarius A*. The detection was made at 4.8 GHz and 8.4 GHz with the Very Large Array. We nd that the fractional circular polarization at 4.8 GHz is m c = ?0:36 0:05% and that the spectral index of the circular polarization is = ?0:6 0:3 (m c /). The systematic error in m c is less than 0.04% at...

A reconfigurable patch antenna consisting of a square patch with two cross-shaped diagonal slots is presented. The proposed design approach is based on the use of two pairs of switches in order to obtain both frequency and polarization reconfigurability. Specifically, three different polarization states have been obtained: a Right-Hand Circular Polarization, a Left-Hand Circular Polarization an...

We report the discovery of circularly polarized radio emission from the radio-jet X-ray binary SS 433 with the Australia Telescope Compact Array. The flux density spectrum of the circular polarization, clearly detected at four frequencies between 1 and 9 GHz, is of the form V~nu-0.9+/-0.1. Multiple components in the source and a lack of very high spatial resolution do not allow a unique determi...