A Varactor Tuned Branch-Line Hybrid Coupler

2006 ◽  
Author(s):  
E.A. Fardin ◽  
K. Ghorbani ◽  
A.S. Holland
Keyword(s):  
Branch Line ◽  
Hybrid Coupler

scholarly journals A Defected Ground Structure without Ground Contact Problem and Application to Branch Line Couplers

2013 ◽  
Vol 2013 ◽  
pp. 1-5 ◽  
Author(s):  
Jongsik Lim ◽  
Dal Ahn ◽  
Sang-Min Han ◽  
Yongchae Jeong ◽  
Haiwen Liu
Keyword(s):  
Contact Problem ◽  
Microstrip Line ◽  
Ground Plane ◽  
Ground Contact ◽  
Defected Ground Structure ◽  
Critical Problem ◽  
Ground Structure ◽  
Branch Line ◽  
Layered Substrate ◽  
Hybrid Coupler

A new defected ground structure (DGS) microstrip line that is free from the ground contact problem is described together with its application example. The proposed DGS microstrip line adopts a double-layered substrate. The first layer contains the microstrip line and DGS patterns on the top and bottom planes as with the conventional DGS line. The second substrate, of which upper metal plane has already been removed, is attached to the bottom ground plane of the first layer. This structure prevents the ground plane of the first substrate with DGS patterns from making contact with the metal housing. The proposed DGS microstrip line has advantageous transmission and rejection characteristics, without the ground contact problem of DGS patterns, which has been a critical problem of previous DGS lines. A 10 dB branch line hybrid coupler is designed and measured, as an example of application of the proposed DGS microstrip line.

A new design method for a dual band branch line hybrid coupler

2015 ◽  
Vol 15 (2) ◽  
pp. 152-158
Author(s):  
D Baatarkhuu ◽  
B Myagmarsuren ◽  
R Baigalmaa
Keyword(s):  
Transmission Lines ◽  
Design Method ◽  
Dual Band ◽  
Branch Line ◽  
Hybrid Coupler

This paper presents the design of a dual band branch line hybrid coupler (BLHC) with different power division ratios at two bands. In the proposed design, transmission lines of the BLHC are transformed to

scholarly journals Wideband Microstrip 90° Hybrid Coupler Using High Pass Network

2014 ◽  
Vol 2014 ◽  
pp. 1-6 ◽  
Author(s):  
Leung Chiu
Keyword(s):  
Transmission Line ◽  
Impedance Bandwidth ◽  
Phase Inverter ◽  
Branch Line ◽  
Quarter Wavelength ◽  
Lumped Elements ◽  
Hybrid Coupler ◽  
High Pass ◽  
Microstrip Circuit

A wideband 90° hybrid coupler has been presented and implemented in planar microstrip circuit. With similar structure of conversional 2-section branch-line coupler, the proposed coupler consists of a lumped high-pass network but not the quarter wavelength transmission at the center. The values of all lumped elements were optimized to replace a quarter-wavelength transmission line with a phase inverter. To demonstrate the proposed concept, a 1-GHz prototype was fabricated and tested. It achieves 90% impedance bandwidth with magnitude of S11 less than −10 dB. Within this bandwidth, more than 13 dB port-to-port isolation, less than 5.0 degree phase imbalance, and less than 4.5 dB magnitude imbalance are achieved, simultaneously. The proposed coupler not only achieves much wider bandwidth but also occupies less circuit area than that of the conversional 2-section branch-line coupler.

scholarly journals PENGARUH PERUBAHAN DIMENSI TERHADAP NILAI ISOLASI PADA BRANCH LINE COUPLER

2021 ◽  
Vol 8 (1) ◽  
pp. 177-182
Author(s):  
Yudi Barnadi
Keyword(s):  
Insertion Loss ◽  
Return Loss ◽  
Branch Line ◽  
Power Coupling ◽  
Hybrid Coupler

Luasnya perairan nasional menjadi tantangan tersendiri bagi pemerintah dalam upaya pengamanan wilayah laut dari tindakan pelanggaran hukum. Indonesia perlu mengawasi betul-betul wilayah yang paling rawan agar sumber daya ikan nasional bisa dinikmati oleh masyarakat. Caranya, pangkalan bagi kapal-kapal pengawas (KKP, Bakamla, TNI AL) perlu dibangun di wilayah tersebut. Salah satu upaya yang perlu dilakukan yaitu peningkatan pengawasan secara ketat pemerintah dengan cara meningkatkan keamanan sekaligus menyusun aturan yang tepat agar bisa mencegah terjadinya  pelanggaran hukum.  kemampuan TNI AL dan Polri untuk menjaga seluruh wilayah laut, maka mereka harus menggunakan radar pengawas pantai. Radar pulsa ini  mempunyai gelombang elektromagnetik yang  diputus secara berirama, dan hanya memiliki satu antena yang digunakan untuk mengirim dan menerima sinyal. Untuk mengirim dan menerima sinyal, radar ini membutuhkan pemisah yang disebut duplekser. Duplekser berfungsi untuk mengisolasi sinyal yang ditransmisikan dan sinyal yang diterima dan komponen utama dari duplexer adalah Branch-Line Hybrid Coupler. Coupler memiliki parameter yang menunjukkan kinerja seperti: Return Loss, Power Coupling, Insertion Loss dan nilai isolasi. Dalam penelitian ini dilakukan penelitian untuk mengetahui pengaruh perubahan dimensi terhadap nilai isolasi pada Branch line coupler. Isolasi sangat penting karena mempengaruhi kinerja duplekser. Nilai yang lebih kecil semakin baik kinerja  duplekser tersebut. Penelitian ini dilakukan dengan memodifikasi panjang dan lebar saluran impedansi Coupler. Branch-Line Coupler dirancang dalam bentuk mikrostrip dan difabrikasi menggunakan substrat FR-4 yang memiliki konstanta dielektrik 4,6, tebal 1,3 mm, dan frekuensi operasi 3 GHz. Untuk mendapatkan nilai optimasi karakteristik isolasi, kanal impedansi harus dimodifikasi, yaitu panjang dan lebar seri lengan (Z0 = 50 ), panjang dan lebar seri lengan (Z0 = 35,35 ), dan panjang dan lebar lengan shunt (Z0 = 50 ). Hasil optimasi isolasi didapatkan -67.786 dB.

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