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The original layout of the microstrip branch-line 3-dB coupler with considerably smaller dimensions, compared to the conventional one, due to the use of a sequence of high- and low-impedance lines representing a lowpass filter is presented in this paper. Such filters have smaller longitudinal size than conventional microstrip line. The proposed design with a central frequency of 2000 MHz was simulated...
The article presents the ability of using low-pass filters for creating the miniaturized microstrip line based microwave devices. Numerical simulation and experimental research were made for branch-line hybrid coupler with 3 dB power division at 2000 MHz. Isolation bandwidth with the level of 20 dB is 745 MHz. Dimensions of the miniaturized device are 15.5 mm × 23.9 mm = 370.45 mm2, that is 66% less...
Miniaturization of microwave devices such as couplers, filters, switchers etc. is an important practical problem due to the tendency of integration of portable and small high-frequency electronics. This article is dedicated to the investigation of the central frequency influence on the miniaturization efficiency of a microstrip branch-line coupler. Simulation of couplers with central frequencies of...
This article is dedicated to the new procedure of synthesizing microwave devices which provides size reduction of conventional microstrip structures. In the proposed method traditional transmission lines are replaced with microstrip lowpass filters having the same phase response on the frequency of interest. As an example the usage of this procedure is shown on miniaturization of a branch-line coupler...
A miniaturized branch-line coupler based on lowpass microstrip filters instead of conventional transmission lines is presented in this paper. The design of proposed couplers is performed using lowpass filter of 5th, 7th and 9th order. This is done to achieve a compact circuit layout in microstrip implementation. Prototypes with these proposed structures, operating at 2 GHz frequency, have been designed...
A leaky-wave antenna based on a rectangular waveguide with partially dielectric filling and transverse slots is investigated. A velocity factor dependencies for uniform filling and different slot lengths are presented. Also, dielectric layer thickness variations are considered. The influence of the dielectric layer position in the waveguide on the antenna characteristics is estimated. The radiation...
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