Antenna apparatus for use in mobile radio communication...

Details Antenna apparatus for use in mobile radio communication... Antenna apparatus for use in mobile radio communication...

H - Electricity

01

Q

H01Q 1/24 (2006.01) H01Q 1/36 (2006.01)

Patent

CA 2293285

In a state that a whip antenna 101 is contained in a housing 110 of a cellular phone, a minute space dl is formed between a feeding spring 117 and an attaching member 112 conductive to a screw antenna base portion 120, so as to generate electrostatic capacitance, which is equivalent to the impedance characteristic of mono-pole antenna 114. Then, electrostatic capacitance and a coil portion of a screw antenna 113 constitute an LC series resonance circuit so as to improve the wide band of screw antenna 113.

On décrit une antenne en spirale qui comprend une structure pouvant présenter un espace réduit (d1) ménagé entre un ressort d'alimentation (117) et une ferrure d'attache (112) fixée à une extrémité proximale (120) de l'antenne en spirale, lorsqu'une antenne-fouet (101) est poussée à l'intérieur du boîtier (110) d'un téléphone cellulaire. L'espace fournit une capacité d'une impédance équivalente caractéristique d'une antenne monopolaire (114). La capacité et la bobine de l'antenne en spirale (113) coopèrent pour former un circuit résonant série LC qui permet à l'antenne en spirale (113) de fonctionner sur une large gamme de fréquences.

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