Yoshihiro Konishi

The Design of a Bandpass Filter with Inductive Strip -- Planar Circuit Mounted in Waveguide

The equivalent circuit of an inductive strip inserted in the middle of a waveguide parallel to the E plane is analyzed theoretically by evaluating the inductive reactance of the equivalent T network which was obtained by the Rayleigh-Ritz variational technique. A design theory for the bandpass filter of this type is derived from this equivalent circuit. The confirmation between the design theory and the experimental resuIts is also shown.

Short End Effect of Ridge Guide with Planar Circuit Mounted in a Waveguide

The end effect of the short end ridge guide with planar circuit mounted in a waveguide is theoretically obtained by a variational method. The results were also confirmed by measured values. The resonant frequency of a ridge guide resonator was also obtained by using the above mentioned end effect.

12-GHz -Band FM Receiver for Satellite Broadcasting

This paper describes the low-noise low-cost receiver for satellite broadcasting with new technology developed by us. The paper also describes the image recovery theory, the design principle of our downconverter, a frequency-stabilized local oscillator with bipolar transistors, the required limiting factor of a filter, the removing circuit of an energy dispersal signal, and a parabolic antenna for circularly polarized waves together with the performance of our device. The experimental results obtained through the Communication Technology Satellite (CTS) are also shown.

VHF, UHF Miniaturized Circulator and its Application

従来のストリップラインサーキュレーターでVHF, UHF帯の損失の少ないものを作ろうとすると, それに必要な磁性材料が大きくなる.たとえば, 100Mcでは直径30cm程度となる.そこで, テレビ受像機などに適用できる微小電力用の小形サーキュレーターとして, 中心導体が網状構造をもつ集中定数形サーキュレーターを提案し, その働作原理と電気的な特性とを記述した.特にその帯域幅ならびに損失と, フェライトの働作点の関係, また, 同一構造で外部付加Cだけを変えることにより, 50-300Mc程度の広範囲の周波数に調整しうること.また, 外部に付加回路をつけて広帯域化し, UHFテレビ受信帯470-770Mcに適用できる広帯域のものができることなどが記されている.