Stub (electronics)

About: Stub (electronics) is a research topic. Over the lifetime, 8172 publications have been published within this topic receiving 75018 citations.

Integrated Dual-Band Filtering/Duplexing Antennas

Abstract: In this paper, the state-of-the-art integrated filtering antennas with dual-band operation are first reviewed. Then, two designs of dual-band microstrip filtering antennas with a low-frequency ratio are presented. The 1st design is a dual-band dual-polarization (DBDP) antenna with a frequency ratio of 1.2 on a single patch, by employing the coupled resonator technique. Two bands at each polarization are achieved by vertically coupling a hairpin resonator with a patch through a slot in the ground plane and then coupled to a dual-mode stub loaded resonator. Each band exhibits a 2nd-order filtering performance with improved bandwidth and out-of-band rejection. Such an integration technique could significantly reduce the dimension and the complexity of the traditional DBDP antennas/arrays. In the 2nd design, a novel dual-port dual-band antenna (with a frequency ratio of 1.38) with the integrated filtering and duplexing functions is proposed. The frequency duplexing function is implemented by coupling a single patch with two sets of resonator-based filtering channels via a U-slot resonator inserted in the ground. This device seamlessly integrates the functions of duplexers, filters, and antennas in a very compact structure.

A design of tunable UWB filters

Abstract: A novel design method is proposed for UWB filters using a ring resonator structure with a stub. A five stage UWB filter with 86.6% relative bandwidth is fabricated based on a design method which shows an excellent performance, i.e. low insertion loss of 0.58 dB and flat group delay of 1.6 nsec. We also extend the design method to the one for a wide range tunable filter. Simulated results show that more than 40% tunable range can be obtained with a single capacitor for each ring resonator.

Heater glass sheet with broad band receiver antennae

Abstract: A glass sheet with broad band receiver antennae and an area to be heated, comprising a glass sheet, a first means provided in the heating area of the glass sheet and capable of functioning both as a heating conductor wire and as a first receiver antennae for receiving waves in predetermined frequency band, an electric source connected to the first means for supplying a heating current to the first means, and a second means provided in an area of the glass sheet other than the heating area and capable of functioning as second receiver antennae for receiving waves in a frequency band different from the frequency band for the first receiver antennae. This glass sheet further includes a stub one end of which is connected to the first means and the other of which to the second means, and a feeder connected to the second means.

Compact Notched Ultra-Wideband Bandpass Filter with Improved Out-of-Band Performance Using Quasi Electromagnetic Bandgap Structure

Abstract: In this paper, a compact notched ultra-wideband (UWB) bandpass fllter with improved out-of-band performance using quasi electromagnetic bandgap (EBG) structure is proposed. Firstly, a UWB bandpass fllter based on a stepped-impedance stub-loaded resonator (SISLR) is combined with quasi-EBG structures, which suppress the undesired spurious bands to improve the out-of-band performance. In order to eliminate the interference caused by WLAN, a notched band is introduced at 5.2GHz, which is implemented by adding a folded stepped-impedance resonator (SIR) near the stub of the SISLR. At last, the proposed fllter is fabricated and measured. Good performances of the UWB fllter have been demonstrated both in the simulated and measured results.

Stubbed Branch Line Balun

Abstract: A new impedance transforming balun scheme is presented based on the branch line structure with stubs on the vertical branches. The stubbed vertical branch eliminates the unwanted even mode output and provides only the required balun output with opposite phase. Also, the use of stubs reduces the branch lengths by two times the stub length and therefore, helps to reduce the total size of the proposed balun