JPS6484902A - Directional coupler - Google Patents

Directional coupler

Info

Publication number
JPS6484902A
JPS6484902A JP24115887A JP24115887A JPS6484902A JP S6484902 A JPS6484902 A JP S6484902A JP 24115887 A JP24115887 A JP 24115887A JP 24115887 A JP24115887 A JP 24115887A JP S6484902 A JPS6484902 A JP S6484902A
Authority
JP
Japan
Prior art keywords
circuits
characteristic
capacitors
length
theta
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
JP24115887A
Other languages
Japanese (ja)
Other versions
JP2514377B2 (en
Inventor
Tetsuo Hirota
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nippon Telegraph and Telephone Corp
Original Assignee
Nippon Telegraph and Telephone Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nippon Telegraph and Telephone Corp filed Critical Nippon Telegraph and Telephone Corp
Priority to JP24115887A priority Critical patent/JP2514377B2/en
Publication of JPS6484902A publication Critical patent/JPS6484902A/en
Application granted granted Critical
Publication of JP2514377B2 publication Critical patent/JP2514377B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Abstract

PURPOSE:To miniaturize the device without causing the deterioration in a characteristic by making the length of four transmission lines shorter than 1/4 wavelength in a use frequency, and also, connecting a capacitor to a connecting point of the transmission line. CONSTITUTION:Transmission lines 1-4 are connected annularly, and by connecting input/output transmission lines 5-8 and capacitors 21-24 to each connecting point, a circuit is formed. When length of the transmission circuits 1-4 is 1/4 of a use frequency, when the capacitors 21-24 are connected, electrical length of the circuits 1-4 is varied in accordance with its capacity. When the electrical length of the circuits 1-4 is theta, the respective characteristic admittances become sin theta times, and become small by connecting the capacitors 21-24. The capacity C of the capacitor is shown by the equation. In this regard, Ya and Yb are characteristic admittances of the circuits 1, 2 and the circuits 3, 4, respectively. From a result of the equation, the electrical length theta is derived, the transmission line is shortened consequently, the device is miniaturized without deteriorating the characteristic, and the design accuracy is improved.
JP24115887A 1987-09-26 1987-09-26 Directional coupler Expired - Lifetime JP2514377B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP24115887A JP2514377B2 (en) 1987-09-26 1987-09-26 Directional coupler

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP24115887A JP2514377B2 (en) 1987-09-26 1987-09-26 Directional coupler

Publications (2)

Publication Number Publication Date
JPS6484902A true JPS6484902A (en) 1989-03-30
JP2514377B2 JP2514377B2 (en) 1996-07-10

Family

ID=17070125

Family Applications (1)

Application Number Title Priority Date Filing Date
JP24115887A Expired - Lifetime JP2514377B2 (en) 1987-09-26 1987-09-26 Directional coupler

Country Status (1)

Country Link
JP (1) JP2514377B2 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04505532A (en) * 1989-06-02 1992-09-24 モトローラ・インコーポレーテッド Capacitively compensated microstrip directional coupler
US5304961A (en) * 1992-03-30 1994-04-19 Motorola, Inc. Impedance transforming directional coupler

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04505532A (en) * 1989-06-02 1992-09-24 モトローラ・インコーポレーテッド Capacitively compensated microstrip directional coupler
US5304961A (en) * 1992-03-30 1994-04-19 Motorola, Inc. Impedance transforming directional coupler

Also Published As

Publication number Publication date
JP2514377B2 (en) 1996-07-10

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